12573a464SChuck Lever // SPDX-License-Identifier: GPL-2.0 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * Neil Brown <neilb@cse.unsw.edu.au> 41da177e4SLinus Torvalds * J. Bruce Fields <bfields@umich.edu> 51da177e4SLinus Torvalds * Andy Adamson <andros@umich.edu> 61da177e4SLinus Torvalds * Dug Song <dugsong@monkey.org> 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * RPCSEC_GSS server authentication. 91da177e4SLinus Torvalds * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078 101da177e4SLinus Torvalds * (gssapi) 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * The RPCSEC_GSS involves three stages: 131da177e4SLinus Torvalds * 1/ context creation 141da177e4SLinus Torvalds * 2/ data exchange 151da177e4SLinus Torvalds * 3/ context destruction 161da177e4SLinus Torvalds * 171da177e4SLinus Torvalds * Context creation is handled largely by upcalls to user-space. 181da177e4SLinus Torvalds * In particular, GSS_Accept_sec_context is handled by an upcall 191da177e4SLinus Torvalds * Data exchange is handled entirely within the kernel 201da177e4SLinus Torvalds * In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel. 211da177e4SLinus Torvalds * Context destruction is handled in-kernel 221da177e4SLinus Torvalds * GSS_Delete_sec_context is in-kernel 231da177e4SLinus Torvalds * 241da177e4SLinus Torvalds * Context creation is initiated by a RPCSEC_GSS_INIT request arriving. 251da177e4SLinus Torvalds * The context handle and gss_token are used as a key into the rpcsec_init cache. 261da177e4SLinus Torvalds * The content of this cache includes some of the outputs of GSS_Accept_sec_context, 271da177e4SLinus Torvalds * being major_status, minor_status, context_handle, reply_token. 281da177e4SLinus Torvalds * These are sent back to the client. 291da177e4SLinus Torvalds * Sequence window management is handled by the kernel. The window size if currently 301da177e4SLinus Torvalds * a compile time constant. 311da177e4SLinus Torvalds * 321da177e4SLinus Torvalds * When user-space is happy that a context is established, it places an entry 331da177e4SLinus Torvalds * in the rpcsec_context cache. The key for this cache is the context_handle. 341da177e4SLinus Torvalds * The content includes: 351da177e4SLinus Torvalds * uid/gidlist - for determining access rights 361da177e4SLinus Torvalds * mechanism type 371da177e4SLinus Torvalds * mechanism specific information, such as a key 381da177e4SLinus Torvalds * 391da177e4SLinus Torvalds */ 401da177e4SLinus Torvalds 415a0e3ad6STejun Heo #include <linux/slab.h> 421da177e4SLinus Torvalds #include <linux/types.h> 431da177e4SLinus Torvalds #include <linux/module.h> 441da177e4SLinus Torvalds #include <linux/pagemap.h> 45ae2975bcSEric W. Biederman #include <linux/user_namespace.h> 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds #include <linux/sunrpc/auth_gss.h> 481da177e4SLinus Torvalds #include <linux/sunrpc/gss_err.h> 491da177e4SLinus Torvalds #include <linux/sunrpc/svcauth.h> 501da177e4SLinus Torvalds #include <linux/sunrpc/svcauth_gss.h> 511da177e4SLinus Torvalds #include <linux/sunrpc/cache.h> 524dd9daa9SChuck Lever #include <linux/sunrpc/gss_krb5.h> 53ff27e9f7SChuck Lever 54ff27e9f7SChuck Lever #include <trace/events/rpcgss.h> 55ff27e9f7SChuck Lever 56030d794bSSimo Sorce #include "gss_rpc_upcall.h" 571da177e4SLinus Torvalds 584dd9daa9SChuck Lever /* 594dd9daa9SChuck Lever * Unfortunately there isn't a maximum checksum size exported via the 604dd9daa9SChuck Lever * GSS API. Manufacture one based on GSS mechanisms supported by this 614dd9daa9SChuck Lever * implementation. 624dd9daa9SChuck Lever */ 634dd9daa9SChuck Lever #define GSS_MAX_CKSUMSIZE (GSS_KRB5_TOK_HDR_LEN + GSS_KRB5_MAX_CKSUM_LEN) 644dd9daa9SChuck Lever 654dd9daa9SChuck Lever /* 664dd9daa9SChuck Lever * This value may be increased in the future to accommodate other 674dd9daa9SChuck Lever * usage of the scratch buffer. 684dd9daa9SChuck Lever */ 694dd9daa9SChuck Lever #define GSS_SCRATCH_SIZE GSS_MAX_CKSUMSIZE 704dd9daa9SChuck Lever 714dd9daa9SChuck Lever struct gss_svc_data { 724dd9daa9SChuck Lever /* decoded gss client cred: */ 734dd9daa9SChuck Lever struct rpc_gss_wire_cred clcred; 744dd9daa9SChuck Lever /* save a pointer to the beginning of the encoded verifier, 754dd9daa9SChuck Lever * for use in encryption/checksumming in svcauth_gss_release: */ 764dd9daa9SChuck Lever __be32 *verf_start; 774dd9daa9SChuck Lever struct rsc *rsci; 784dd9daa9SChuck Lever 794dd9daa9SChuck Lever /* for temporary results */ 804dd9daa9SChuck Lever u8 gsd_scratch[GSS_SCRATCH_SIZE]; 814dd9daa9SChuck Lever }; 82a1db410dSStanislav Kinsbursky 831da177e4SLinus Torvalds /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests 841da177e4SLinus Torvalds * into replies. 851da177e4SLinus Torvalds * 861da177e4SLinus Torvalds * Key is context handle (\x if empty) and gss_token. 871da177e4SLinus Torvalds * Content is major_status minor_status (integers) context_handle, reply_token. 881da177e4SLinus Torvalds * 891da177e4SLinus Torvalds */ 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b) 921da177e4SLinus Torvalds { 931da177e4SLinus Torvalds return a->len == b->len && 0 == memcmp(a->data, b->data, a->len); 941da177e4SLinus Torvalds } 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds #define RSI_HASHBITS 6 971da177e4SLinus Torvalds #define RSI_HASHMAX (1<<RSI_HASHBITS) 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds struct rsi { 1001da177e4SLinus Torvalds struct cache_head h; 1011da177e4SLinus Torvalds struct xdr_netobj in_handle, in_token; 1021da177e4SLinus Torvalds struct xdr_netobj out_handle, out_token; 1031da177e4SLinus Torvalds int major_status, minor_status; 1046d1616b2STrond Myklebust struct rcu_head rcu_head; 1051da177e4SLinus Torvalds }; 1061da177e4SLinus Torvalds 107a1db410dSStanislav Kinsbursky static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old); 108a1db410dSStanislav Kinsbursky static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item); 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds static void rsi_free(struct rsi *rsii) 1111da177e4SLinus Torvalds { 1121da177e4SLinus Torvalds kfree(rsii->in_handle.data); 1131da177e4SLinus Torvalds kfree(rsii->in_token.data); 1141da177e4SLinus Torvalds kfree(rsii->out_handle.data); 1151da177e4SLinus Torvalds kfree(rsii->out_token.data); 1161da177e4SLinus Torvalds } 1171da177e4SLinus Torvalds 1186d1616b2STrond Myklebust static void rsi_free_rcu(struct rcu_head *head) 1196d1616b2STrond Myklebust { 1206d1616b2STrond Myklebust struct rsi *rsii = container_of(head, struct rsi, rcu_head); 1216d1616b2STrond Myklebust 1226d1616b2STrond Myklebust rsi_free(rsii); 1236d1616b2STrond Myklebust kfree(rsii); 1246d1616b2STrond Myklebust } 1256d1616b2STrond Myklebust 126baab935fSNeilBrown static void rsi_put(struct kref *ref) 1271da177e4SLinus Torvalds { 128baab935fSNeilBrown struct rsi *rsii = container_of(ref, struct rsi, h.ref); 1296d1616b2STrond Myklebust 1306d1616b2STrond Myklebust call_rcu(&rsii->rcu_head, rsi_free_rcu); 1311da177e4SLinus Torvalds } 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds static inline int rsi_hash(struct rsi *item) 1341da177e4SLinus Torvalds { 1351da177e4SLinus Torvalds return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS) 1361da177e4SLinus Torvalds ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS); 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 139d4d11ea9SNeilBrown static int rsi_match(struct cache_head *a, struct cache_head *b) 1401da177e4SLinus Torvalds { 141d4d11ea9SNeilBrown struct rsi *item = container_of(a, struct rsi, h); 142d4d11ea9SNeilBrown struct rsi *tmp = container_of(b, struct rsi, h); 143f64f9e71SJoe Perches return netobj_equal(&item->in_handle, &tmp->in_handle) && 144f64f9e71SJoe Perches netobj_equal(&item->in_token, &tmp->in_token); 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len) 1481da177e4SLinus Torvalds { 1491da177e4SLinus Torvalds dst->len = len; 150e69062b4SArnaldo Carvalho de Melo dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL); 1511da177e4SLinus Torvalds if (len && !dst->data) 1521da177e4SLinus Torvalds return -ENOMEM; 1531da177e4SLinus Torvalds return 0; 1541da177e4SLinus Torvalds } 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src) 1571da177e4SLinus Torvalds { 1581da177e4SLinus Torvalds return dup_to_netobj(dst, src->data, src->len); 1591da177e4SLinus Torvalds } 1601da177e4SLinus Torvalds 161d4d11ea9SNeilBrown static void rsi_init(struct cache_head *cnew, struct cache_head *citem) 1621da177e4SLinus Torvalds { 163d4d11ea9SNeilBrown struct rsi *new = container_of(cnew, struct rsi, h); 164d4d11ea9SNeilBrown struct rsi *item = container_of(citem, struct rsi, h); 165d4d11ea9SNeilBrown 1661da177e4SLinus Torvalds new->out_handle.data = NULL; 1671da177e4SLinus Torvalds new->out_handle.len = 0; 1681da177e4SLinus Torvalds new->out_token.data = NULL; 1691da177e4SLinus Torvalds new->out_token.len = 0; 1701da177e4SLinus Torvalds new->in_handle.len = item->in_handle.len; 1711da177e4SLinus Torvalds item->in_handle.len = 0; 1721da177e4SLinus Torvalds new->in_token.len = item->in_token.len; 1731da177e4SLinus Torvalds item->in_token.len = 0; 1741da177e4SLinus Torvalds new->in_handle.data = item->in_handle.data; 1751da177e4SLinus Torvalds item->in_handle.data = NULL; 1761da177e4SLinus Torvalds new->in_token.data = item->in_token.data; 1771da177e4SLinus Torvalds item->in_token.data = NULL; 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds 180d4d11ea9SNeilBrown static void update_rsi(struct cache_head *cnew, struct cache_head *citem) 1811da177e4SLinus Torvalds { 182d4d11ea9SNeilBrown struct rsi *new = container_of(cnew, struct rsi, h); 183d4d11ea9SNeilBrown struct rsi *item = container_of(citem, struct rsi, h); 184d4d11ea9SNeilBrown 1851da177e4SLinus Torvalds BUG_ON(new->out_handle.data || new->out_token.data); 1861da177e4SLinus Torvalds new->out_handle.len = item->out_handle.len; 1871da177e4SLinus Torvalds item->out_handle.len = 0; 1881da177e4SLinus Torvalds new->out_token.len = item->out_token.len; 1891da177e4SLinus Torvalds item->out_token.len = 0; 1901da177e4SLinus Torvalds new->out_handle.data = item->out_handle.data; 1911da177e4SLinus Torvalds item->out_handle.data = NULL; 1921da177e4SLinus Torvalds new->out_token.data = item->out_token.data; 1931da177e4SLinus Torvalds item->out_token.data = NULL; 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds new->major_status = item->major_status; 1961da177e4SLinus Torvalds new->minor_status = item->minor_status; 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds 199d4d11ea9SNeilBrown static struct cache_head *rsi_alloc(void) 200d4d11ea9SNeilBrown { 201d4d11ea9SNeilBrown struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL); 202d4d11ea9SNeilBrown if (rsii) 203d4d11ea9SNeilBrown return &rsii->h; 204d4d11ea9SNeilBrown else 205d4d11ea9SNeilBrown return NULL; 206d4d11ea9SNeilBrown } 207d4d11ea9SNeilBrown 20865286b88STrond Myklebust static int rsi_upcall(struct cache_detail *cd, struct cache_head *h) 20965286b88STrond Myklebust { 21065286b88STrond Myklebust return sunrpc_cache_pipe_upcall_timeout(cd, h); 21165286b88STrond Myklebust } 21265286b88STrond Myklebust 2131da177e4SLinus Torvalds static void rsi_request(struct cache_detail *cd, 2141da177e4SLinus Torvalds struct cache_head *h, 2151da177e4SLinus Torvalds char **bpp, int *blen) 2161da177e4SLinus Torvalds { 2171da177e4SLinus Torvalds struct rsi *rsii = container_of(h, struct rsi, h); 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len); 2201da177e4SLinus Torvalds qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len); 2211da177e4SLinus Torvalds (*bpp)[-1] = '\n'; 2220c217d50SNeilBrown WARN_ONCE(*blen < 0, 2230c217d50SNeilBrown "RPCSEC/GSS credential too large - please use gssproxy\n"); 2241da177e4SLinus Torvalds } 2251da177e4SLinus Torvalds 2261da177e4SLinus Torvalds static int rsi_parse(struct cache_detail *cd, 2271da177e4SLinus Torvalds char *mesg, int mlen) 2281da177e4SLinus Torvalds { 2291da177e4SLinus Torvalds /* context token expiry major minor context token */ 2301da177e4SLinus Torvalds char *buf = mesg; 2311da177e4SLinus Torvalds char *ep; 2321da177e4SLinus Torvalds int len; 2331da177e4SLinus Torvalds struct rsi rsii, *rsip = NULL; 234f559935eSArnd Bergmann time64_t expiry; 2351da177e4SLinus Torvalds int status = -EINVAL; 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds memset(&rsii, 0, sizeof(rsii)); 2381da177e4SLinus Torvalds /* handle */ 2391da177e4SLinus Torvalds len = qword_get(&mesg, buf, mlen); 2401da177e4SLinus Torvalds if (len < 0) 2411da177e4SLinus Torvalds goto out; 2421da177e4SLinus Torvalds status = -ENOMEM; 2431da177e4SLinus Torvalds if (dup_to_netobj(&rsii.in_handle, buf, len)) 2441da177e4SLinus Torvalds goto out; 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds /* token */ 2471da177e4SLinus Torvalds len = qword_get(&mesg, buf, mlen); 2481da177e4SLinus Torvalds status = -EINVAL; 2491da177e4SLinus Torvalds if (len < 0) 2501da177e4SLinus Torvalds goto out; 2511da177e4SLinus Torvalds status = -ENOMEM; 2521da177e4SLinus Torvalds if (dup_to_netobj(&rsii.in_token, buf, len)) 2531da177e4SLinus Torvalds goto out; 2541da177e4SLinus Torvalds 255a1db410dSStanislav Kinsbursky rsip = rsi_lookup(cd, &rsii); 256d4d11ea9SNeilBrown if (!rsip) 257d4d11ea9SNeilBrown goto out; 258d4d11ea9SNeilBrown 2591da177e4SLinus Torvalds rsii.h.flags = 0; 2601da177e4SLinus Torvalds /* expiry */ 2611da177e4SLinus Torvalds expiry = get_expiry(&mesg); 2621da177e4SLinus Torvalds status = -EINVAL; 2631da177e4SLinus Torvalds if (expiry == 0) 2641da177e4SLinus Torvalds goto out; 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds /* major/minor */ 2671da177e4SLinus Torvalds len = qword_get(&mesg, buf, mlen); 268b39c18fcSJ. Bruce Fields if (len <= 0) 2691da177e4SLinus Torvalds goto out; 2701da177e4SLinus Torvalds rsii.major_status = simple_strtoul(buf, &ep, 10); 2711da177e4SLinus Torvalds if (*ep) 2721da177e4SLinus Torvalds goto out; 2731da177e4SLinus Torvalds len = qword_get(&mesg, buf, mlen); 2741da177e4SLinus Torvalds if (len <= 0) 2751da177e4SLinus Torvalds goto out; 2761da177e4SLinus Torvalds rsii.minor_status = simple_strtoul(buf, &ep, 10); 2771da177e4SLinus Torvalds if (*ep) 2781da177e4SLinus Torvalds goto out; 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds /* out_handle */ 2811da177e4SLinus Torvalds len = qword_get(&mesg, buf, mlen); 2821da177e4SLinus Torvalds if (len < 0) 2831da177e4SLinus Torvalds goto out; 2841da177e4SLinus Torvalds status = -ENOMEM; 2851da177e4SLinus Torvalds if (dup_to_netobj(&rsii.out_handle, buf, len)) 2861da177e4SLinus Torvalds goto out; 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds /* out_token */ 2891da177e4SLinus Torvalds len = qword_get(&mesg, buf, mlen); 2901da177e4SLinus Torvalds status = -EINVAL; 2911da177e4SLinus Torvalds if (len < 0) 2921da177e4SLinus Torvalds goto out; 2931da177e4SLinus Torvalds status = -ENOMEM; 2941da177e4SLinus Torvalds if (dup_to_netobj(&rsii.out_token, buf, len)) 2951da177e4SLinus Torvalds goto out; 2961da177e4SLinus Torvalds rsii.h.expiry_time = expiry; 297a1db410dSStanislav Kinsbursky rsip = rsi_update(cd, &rsii, rsip); 2981da177e4SLinus Torvalds status = 0; 2991da177e4SLinus Torvalds out: 3001da177e4SLinus Torvalds rsi_free(&rsii); 3011da177e4SLinus Torvalds if (rsip) 302a1db410dSStanislav Kinsbursky cache_put(&rsip->h, cd); 303d4d11ea9SNeilBrown else 304d4d11ea9SNeilBrown status = -ENOMEM; 3051da177e4SLinus Torvalds return status; 3061da177e4SLinus Torvalds } 3071da177e4SLinus Torvalds 308ee24eac3SBhumika Goyal static const struct cache_detail rsi_cache_template = { 309f35279d3SBruce Allan .owner = THIS_MODULE, 3101da177e4SLinus Torvalds .hash_size = RSI_HASHMAX, 3111da177e4SLinus Torvalds .name = "auth.rpcsec.init", 3121da177e4SLinus Torvalds .cache_put = rsi_put, 31365286b88STrond Myklebust .cache_upcall = rsi_upcall, 31473fb847aSStanislav Kinsbursky .cache_request = rsi_request, 3151da177e4SLinus Torvalds .cache_parse = rsi_parse, 316d4d11ea9SNeilBrown .match = rsi_match, 317d4d11ea9SNeilBrown .init = rsi_init, 318d4d11ea9SNeilBrown .update = update_rsi, 319d4d11ea9SNeilBrown .alloc = rsi_alloc, 3201da177e4SLinus Torvalds }; 3211da177e4SLinus Torvalds 322a1db410dSStanislav Kinsbursky static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item) 323d4d11ea9SNeilBrown { 324d4d11ea9SNeilBrown struct cache_head *ch; 325d4d11ea9SNeilBrown int hash = rsi_hash(item); 326d4d11ea9SNeilBrown 3276d1616b2STrond Myklebust ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash); 328d4d11ea9SNeilBrown if (ch) 329d4d11ea9SNeilBrown return container_of(ch, struct rsi, h); 330d4d11ea9SNeilBrown else 331d4d11ea9SNeilBrown return NULL; 332d4d11ea9SNeilBrown } 333d4d11ea9SNeilBrown 334a1db410dSStanislav Kinsbursky static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old) 335d4d11ea9SNeilBrown { 336d4d11ea9SNeilBrown struct cache_head *ch; 337d4d11ea9SNeilBrown int hash = rsi_hash(new); 338d4d11ea9SNeilBrown 339a1db410dSStanislav Kinsbursky ch = sunrpc_cache_update(cd, &new->h, 340d4d11ea9SNeilBrown &old->h, hash); 341d4d11ea9SNeilBrown if (ch) 342d4d11ea9SNeilBrown return container_of(ch, struct rsi, h); 343d4d11ea9SNeilBrown else 344d4d11ea9SNeilBrown return NULL; 345d4d11ea9SNeilBrown } 346d4d11ea9SNeilBrown 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds /* 3491da177e4SLinus Torvalds * The rpcsec_context cache is used to store a context that is 3501da177e4SLinus Torvalds * used in data exchange. 3511da177e4SLinus Torvalds * The key is a context handle. The content is: 3521da177e4SLinus Torvalds * uid, gidlist, mechanism, service-set, mech-specific-data 3531da177e4SLinus Torvalds */ 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds #define RSC_HASHBITS 10 3561da177e4SLinus Torvalds #define RSC_HASHMAX (1<<RSC_HASHBITS) 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds #define GSS_SEQ_WIN 128 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds struct gss_svc_seq_data { 3611da177e4SLinus Torvalds /* highest seq number seen so far: */ 36210b9d99aSChuck Lever u32 sd_max; 3631da177e4SLinus Torvalds /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of 3641da177e4SLinus Torvalds * sd_win is nonzero iff sequence number i has been seen already: */ 3651da177e4SLinus Torvalds unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG]; 3661da177e4SLinus Torvalds spinlock_t sd_lock; 3671da177e4SLinus Torvalds }; 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds struct rsc { 3701da177e4SLinus Torvalds struct cache_head h; 3711da177e4SLinus Torvalds struct xdr_netobj handle; 3721da177e4SLinus Torvalds struct svc_cred cred; 3731da177e4SLinus Torvalds struct gss_svc_seq_data seqdata; 3741da177e4SLinus Torvalds struct gss_ctx *mechctx; 3756d1616b2STrond Myklebust struct rcu_head rcu_head; 3761da177e4SLinus Torvalds }; 3771da177e4SLinus Torvalds 378a1db410dSStanislav Kinsbursky static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old); 379a1db410dSStanislav Kinsbursky static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item); 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds static void rsc_free(struct rsc *rsci) 3821da177e4SLinus Torvalds { 3831da177e4SLinus Torvalds kfree(rsci->handle.data); 3841da177e4SLinus Torvalds if (rsci->mechctx) 3851da177e4SLinus Torvalds gss_delete_sec_context(&rsci->mechctx); 38603a4e1f6SJ. Bruce Fields free_svc_cred(&rsci->cred); 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds 3896d1616b2STrond Myklebust static void rsc_free_rcu(struct rcu_head *head) 3906d1616b2STrond Myklebust { 3916d1616b2STrond Myklebust struct rsc *rsci = container_of(head, struct rsc, rcu_head); 3926d1616b2STrond Myklebust 3936d1616b2STrond Myklebust kfree(rsci->handle.data); 3946d1616b2STrond Myklebust kfree(rsci); 3956d1616b2STrond Myklebust } 3966d1616b2STrond Myklebust 397baab935fSNeilBrown static void rsc_put(struct kref *ref) 3981da177e4SLinus Torvalds { 399baab935fSNeilBrown struct rsc *rsci = container_of(ref, struct rsc, h.ref); 4001da177e4SLinus Torvalds 4016d1616b2STrond Myklebust if (rsci->mechctx) 4026d1616b2STrond Myklebust gss_delete_sec_context(&rsci->mechctx); 4036d1616b2STrond Myklebust free_svc_cred(&rsci->cred); 4046d1616b2STrond Myklebust call_rcu(&rsci->rcu_head, rsc_free_rcu); 4051da177e4SLinus Torvalds } 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds static inline int 4081da177e4SLinus Torvalds rsc_hash(struct rsc *rsci) 4091da177e4SLinus Torvalds { 4101da177e4SLinus Torvalds return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS); 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 41317f834b6SNeilBrown static int 41417f834b6SNeilBrown rsc_match(struct cache_head *a, struct cache_head *b) 4151da177e4SLinus Torvalds { 41617f834b6SNeilBrown struct rsc *new = container_of(a, struct rsc, h); 41717f834b6SNeilBrown struct rsc *tmp = container_of(b, struct rsc, h); 41817f834b6SNeilBrown 4191da177e4SLinus Torvalds return netobj_equal(&new->handle, &tmp->handle); 4201da177e4SLinus Torvalds } 4211da177e4SLinus Torvalds 42217f834b6SNeilBrown static void 42317f834b6SNeilBrown rsc_init(struct cache_head *cnew, struct cache_head *ctmp) 4241da177e4SLinus Torvalds { 42517f834b6SNeilBrown struct rsc *new = container_of(cnew, struct rsc, h); 42617f834b6SNeilBrown struct rsc *tmp = container_of(ctmp, struct rsc, h); 42717f834b6SNeilBrown 4281da177e4SLinus Torvalds new->handle.len = tmp->handle.len; 4291da177e4SLinus Torvalds tmp->handle.len = 0; 4301da177e4SLinus Torvalds new->handle.data = tmp->handle.data; 4311da177e4SLinus Torvalds tmp->handle.data = NULL; 4321da177e4SLinus Torvalds new->mechctx = NULL; 43344234063SJ. Bruce Fields init_svc_cred(&new->cred); 4341da177e4SLinus Torvalds } 4351da177e4SLinus Torvalds 43617f834b6SNeilBrown static void 43717f834b6SNeilBrown update_rsc(struct cache_head *cnew, struct cache_head *ctmp) 4381da177e4SLinus Torvalds { 43917f834b6SNeilBrown struct rsc *new = container_of(cnew, struct rsc, h); 44017f834b6SNeilBrown struct rsc *tmp = container_of(ctmp, struct rsc, h); 44117f834b6SNeilBrown 4421da177e4SLinus Torvalds new->mechctx = tmp->mechctx; 4431da177e4SLinus Torvalds tmp->mechctx = NULL; 4441da177e4SLinus Torvalds memset(&new->seqdata, 0, sizeof(new->seqdata)); 4451da177e4SLinus Torvalds spin_lock_init(&new->seqdata.sd_lock); 4461da177e4SLinus Torvalds new->cred = tmp->cred; 44744234063SJ. Bruce Fields init_svc_cred(&tmp->cred); 4481da177e4SLinus Torvalds } 4491da177e4SLinus Torvalds 45017f834b6SNeilBrown static struct cache_head * 45117f834b6SNeilBrown rsc_alloc(void) 45217f834b6SNeilBrown { 45317f834b6SNeilBrown struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL); 45417f834b6SNeilBrown if (rsci) 45517f834b6SNeilBrown return &rsci->h; 45617f834b6SNeilBrown else 45717f834b6SNeilBrown return NULL; 45817f834b6SNeilBrown } 45917f834b6SNeilBrown 46065286b88STrond Myklebust static int rsc_upcall(struct cache_detail *cd, struct cache_head *h) 46165286b88STrond Myklebust { 46265286b88STrond Myklebust return -EINVAL; 46365286b88STrond Myklebust } 46465286b88STrond Myklebust 4651da177e4SLinus Torvalds static int rsc_parse(struct cache_detail *cd, 4661da177e4SLinus Torvalds char *mesg, int mlen) 4671da177e4SLinus Torvalds { 4681da177e4SLinus Torvalds /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */ 4691da177e4SLinus Torvalds char *buf = mesg; 470683428faSEric W. Biederman int id; 4711da177e4SLinus Torvalds int len, rv; 4721da177e4SLinus Torvalds struct rsc rsci, *rscp = NULL; 473294ec5b8SArnd Bergmann time64_t expiry; 4741da177e4SLinus Torvalds int status = -EINVAL; 4751df0cadaSJ. Bruce Fields struct gss_api_mech *gm = NULL; 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds memset(&rsci, 0, sizeof(rsci)); 4781da177e4SLinus Torvalds /* context handle */ 4791da177e4SLinus Torvalds len = qword_get(&mesg, buf, mlen); 4801da177e4SLinus Torvalds if (len < 0) goto out; 4811da177e4SLinus Torvalds status = -ENOMEM; 4821da177e4SLinus Torvalds if (dup_to_netobj(&rsci.handle, buf, len)) 4831da177e4SLinus Torvalds goto out; 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds rsci.h.flags = 0; 4861da177e4SLinus Torvalds /* expiry */ 4871da177e4SLinus Torvalds expiry = get_expiry(&mesg); 4881da177e4SLinus Torvalds status = -EINVAL; 4891da177e4SLinus Torvalds if (expiry == 0) 4901da177e4SLinus Torvalds goto out; 4911da177e4SLinus Torvalds 492a1db410dSStanislav Kinsbursky rscp = rsc_lookup(cd, &rsci); 49317f834b6SNeilBrown if (!rscp) 49417f834b6SNeilBrown goto out; 49517f834b6SNeilBrown 4961da177e4SLinus Torvalds /* uid, or NEGATIVE */ 497683428faSEric W. Biederman rv = get_int(&mesg, &id); 4981da177e4SLinus Torvalds if (rv == -EINVAL) 4991da177e4SLinus Torvalds goto out; 5001da177e4SLinus Torvalds if (rv == -ENOENT) 5011da177e4SLinus Torvalds set_bit(CACHE_NEGATIVE, &rsci.h.flags); 5021da177e4SLinus Torvalds else { 5031da177e4SLinus Torvalds int N, i; 5041da177e4SLinus Torvalds 5053c34ae11SJ. Bruce Fields /* 5063c34ae11SJ. Bruce Fields * NOTE: we skip uid_valid()/gid_valid() checks here: 5073c34ae11SJ. Bruce Fields * instead, * -1 id's are later mapped to the 5083c34ae11SJ. Bruce Fields * (export-specific) anonymous id by nfsd_setuser. 5093c34ae11SJ. Bruce Fields * 5103c34ae11SJ. Bruce Fields * (But supplementary gid's get no such special 5113c34ae11SJ. Bruce Fields * treatment so are checked for validity here.) 5123c34ae11SJ. Bruce Fields */ 513683428faSEric W. Biederman /* uid */ 514e6667c73STrond Myklebust rsci.cred.cr_uid = make_kuid(current_user_ns(), id); 515683428faSEric W. Biederman 5161da177e4SLinus Torvalds /* gid */ 517683428faSEric W. Biederman if (get_int(&mesg, &id)) 518683428faSEric W. Biederman goto out; 519e6667c73STrond Myklebust rsci.cred.cr_gid = make_kgid(current_user_ns(), id); 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds /* number of additional gid's */ 5221da177e4SLinus Torvalds if (get_int(&mesg, &N)) 5231da177e4SLinus Torvalds goto out; 52476cb4be9SDan Carpenter if (N < 0 || N > NGROUPS_MAX) 52576cb4be9SDan Carpenter goto out; 5261da177e4SLinus Torvalds status = -ENOMEM; 5271da177e4SLinus Torvalds rsci.cred.cr_group_info = groups_alloc(N); 5281da177e4SLinus Torvalds if (rsci.cred.cr_group_info == NULL) 5291da177e4SLinus Torvalds goto out; 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds /* gid's */ 5321da177e4SLinus Torvalds status = -EINVAL; 5331da177e4SLinus Torvalds for (i=0; i<N; i++) { 534ae2975bcSEric W. Biederman kgid_t kgid; 535683428faSEric W. Biederman if (get_int(&mesg, &id)) 5361da177e4SLinus Torvalds goto out; 537e6667c73STrond Myklebust kgid = make_kgid(current_user_ns(), id); 538ae2975bcSEric W. Biederman if (!gid_valid(kgid)) 539ae2975bcSEric W. Biederman goto out; 54081243eacSAlexey Dobriyan rsci.cred.cr_group_info->gid[i] = kgid; 5411da177e4SLinus Torvalds } 542bdcf0a42SThiago Rafael Becker groups_sort(rsci.cred.cr_group_info); 5431da177e4SLinus Torvalds 5441da177e4SLinus Torvalds /* mech name */ 5451da177e4SLinus Torvalds len = qword_get(&mesg, buf, mlen); 5461da177e4SLinus Torvalds if (len < 0) 5471da177e4SLinus Torvalds goto out; 5480dc1531aSJ. Bruce Fields gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf); 5491da177e4SLinus Torvalds status = -EOPNOTSUPP; 5501da177e4SLinus Torvalds if (!gm) 5511da177e4SLinus Torvalds goto out; 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds status = -EINVAL; 5541da177e4SLinus Torvalds /* mech-specific data: */ 5551da177e4SLinus Torvalds len = qword_get(&mesg, buf, mlen); 5561df0cadaSJ. Bruce Fields if (len < 0) 5571da177e4SLinus Torvalds goto out; 558400f26b5SSimo Sorce status = gss_import_sec_context(buf, len, gm, &rsci.mechctx, 559400f26b5SSimo Sorce NULL, GFP_KERNEL); 5601df0cadaSJ. Bruce Fields if (status) 5611da177e4SLinus Torvalds goto out; 56268e76ad0SOlga Kornievskaia 56368e76ad0SOlga Kornievskaia /* get client name */ 56468e76ad0SOlga Kornievskaia len = qword_get(&mesg, buf, mlen); 56568e76ad0SOlga Kornievskaia if (len > 0) { 56603a4e1f6SJ. Bruce Fields rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL); 5671eb6d622SWei Yongjun if (!rsci.cred.cr_principal) { 5681eb6d622SWei Yongjun status = -ENOMEM; 56968e76ad0SOlga Kornievskaia goto out; 57068e76ad0SOlga Kornievskaia } 5711eb6d622SWei Yongjun } 57268e76ad0SOlga Kornievskaia 5731da177e4SLinus Torvalds } 5741da177e4SLinus Torvalds rsci.h.expiry_time = expiry; 575a1db410dSStanislav Kinsbursky rscp = rsc_update(cd, &rsci, rscp); 5761da177e4SLinus Torvalds status = 0; 5771da177e4SLinus Torvalds out: 5781da177e4SLinus Torvalds rsc_free(&rsci); 5791da177e4SLinus Torvalds if (rscp) 580a1db410dSStanislav Kinsbursky cache_put(&rscp->h, cd); 58117f834b6SNeilBrown else 58217f834b6SNeilBrown status = -ENOMEM; 5831da177e4SLinus Torvalds return status; 5841da177e4SLinus Torvalds } 5851da177e4SLinus Torvalds 586ee24eac3SBhumika Goyal static const struct cache_detail rsc_cache_template = { 587f35279d3SBruce Allan .owner = THIS_MODULE, 5881da177e4SLinus Torvalds .hash_size = RSC_HASHMAX, 5891da177e4SLinus Torvalds .name = "auth.rpcsec.context", 5901da177e4SLinus Torvalds .cache_put = rsc_put, 59165286b88STrond Myklebust .cache_upcall = rsc_upcall, 5921da177e4SLinus Torvalds .cache_parse = rsc_parse, 59317f834b6SNeilBrown .match = rsc_match, 59417f834b6SNeilBrown .init = rsc_init, 59517f834b6SNeilBrown .update = update_rsc, 59617f834b6SNeilBrown .alloc = rsc_alloc, 5971da177e4SLinus Torvalds }; 5981da177e4SLinus Torvalds 599a1db410dSStanislav Kinsbursky static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item) 60017f834b6SNeilBrown { 60117f834b6SNeilBrown struct cache_head *ch; 60217f834b6SNeilBrown int hash = rsc_hash(item); 60317f834b6SNeilBrown 6046d1616b2STrond Myklebust ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash); 60517f834b6SNeilBrown if (ch) 60617f834b6SNeilBrown return container_of(ch, struct rsc, h); 60717f834b6SNeilBrown else 60817f834b6SNeilBrown return NULL; 60917f834b6SNeilBrown } 61017f834b6SNeilBrown 611a1db410dSStanislav Kinsbursky static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old) 61217f834b6SNeilBrown { 61317f834b6SNeilBrown struct cache_head *ch; 61417f834b6SNeilBrown int hash = rsc_hash(new); 61517f834b6SNeilBrown 616a1db410dSStanislav Kinsbursky ch = sunrpc_cache_update(cd, &new->h, 61717f834b6SNeilBrown &old->h, hash); 61817f834b6SNeilBrown if (ch) 61917f834b6SNeilBrown return container_of(ch, struct rsc, h); 62017f834b6SNeilBrown else 62117f834b6SNeilBrown return NULL; 62217f834b6SNeilBrown } 62317f834b6SNeilBrown 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds static struct rsc * 626a1db410dSStanislav Kinsbursky gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle) 6271da177e4SLinus Torvalds { 6281da177e4SLinus Torvalds struct rsc rsci; 6291da177e4SLinus Torvalds struct rsc *found; 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvalds memset(&rsci, 0, sizeof(rsci)); 632bf2c4b6fSChuck Lever if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) 633bf2c4b6fSChuck Lever return NULL; 634a1db410dSStanislav Kinsbursky found = rsc_lookup(cd, &rsci); 635bf2c4b6fSChuck Lever rsc_free(&rsci); 6361da177e4SLinus Torvalds if (!found) 6371da177e4SLinus Torvalds return NULL; 638a1db410dSStanislav Kinsbursky if (cache_check(cd, &found->h, NULL)) 6391da177e4SLinus Torvalds return NULL; 6401da177e4SLinus Torvalds return found; 6411da177e4SLinus Torvalds } 6421da177e4SLinus Torvalds 64310b9d99aSChuck Lever /** 64410b9d99aSChuck Lever * gss_check_seq_num - GSS sequence number window check 64510b9d99aSChuck Lever * @rqstp: RPC Call to use when reporting errors 64610b9d99aSChuck Lever * @rsci: cached GSS context state (updated on return) 64710b9d99aSChuck Lever * @seq_num: sequence number to check 64810b9d99aSChuck Lever * 64910b9d99aSChuck Lever * Implements sequence number algorithm as specified in 65010b9d99aSChuck Lever * RFC 2203, Section 5.3.3.1. "Context Management". 65110b9d99aSChuck Lever * 65210b9d99aSChuck Lever * Return values: 65310b9d99aSChuck Lever * %true: @rqstp's GSS sequence number is inside the window 65410b9d99aSChuck Lever * %false: @rqstp's GSS sequence number is outside the window 65510b9d99aSChuck Lever */ 65610b9d99aSChuck Lever static bool gss_check_seq_num(const struct svc_rqst *rqstp, struct rsc *rsci, 65710b9d99aSChuck Lever u32 seq_num) 6581da177e4SLinus Torvalds { 6591da177e4SLinus Torvalds struct gss_svc_seq_data *sd = &rsci->seqdata; 66010b9d99aSChuck Lever bool result = false; 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds spin_lock(&sd->sd_lock); 6631da177e4SLinus Torvalds if (seq_num > sd->sd_max) { 6641da177e4SLinus Torvalds if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { 6651da177e4SLinus Torvalds memset(sd->sd_win, 0, sizeof(sd->sd_win)); 6661da177e4SLinus Torvalds sd->sd_max = seq_num; 6671da177e4SLinus Torvalds } else while (sd->sd_max < seq_num) { 6681da177e4SLinus Torvalds sd->sd_max++; 6691da177e4SLinus Torvalds __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); 6701da177e4SLinus Torvalds } 6711da177e4SLinus Torvalds __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); 6721da177e4SLinus Torvalds goto ok; 6732ba5acfbSJ. Bruce Fields } else if (seq_num + GSS_SEQ_WIN <= sd->sd_max) { 67410b9d99aSChuck Lever goto toolow; 6751da177e4SLinus Torvalds } 6761da177e4SLinus Torvalds if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) 67710b9d99aSChuck Lever goto alreadyseen; 67810b9d99aSChuck Lever 6791da177e4SLinus Torvalds ok: 68010b9d99aSChuck Lever result = true; 68110b9d99aSChuck Lever out: 6821da177e4SLinus Torvalds spin_unlock(&sd->sd_lock); 68310b9d99aSChuck Lever return result; 68410b9d99aSChuck Lever 68510b9d99aSChuck Lever toolow: 68610b9d99aSChuck Lever trace_rpcgss_svc_seqno_low(rqstp, seq_num, 68710b9d99aSChuck Lever sd->sd_max - GSS_SEQ_WIN, 68810b9d99aSChuck Lever sd->sd_max); 68910b9d99aSChuck Lever goto out; 69010b9d99aSChuck Lever alreadyseen: 69110b9d99aSChuck Lever trace_rpcgss_svc_seqno_seen(rqstp, seq_num); 69210b9d99aSChuck Lever goto out; 6931da177e4SLinus Torvalds } 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds static inline u32 round_up_to_quad(u32 i) 6961da177e4SLinus Torvalds { 6971da177e4SLinus Torvalds return (i + 3 ) & ~3; 6981da177e4SLinus Torvalds } 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds static inline int 7011da177e4SLinus Torvalds svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) 7021da177e4SLinus Torvalds { 7031da177e4SLinus Torvalds int l; 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds if (argv->iov_len < 4) 7061da177e4SLinus Torvalds return -1; 70776994313SAlexey Dobriyan o->len = svc_getnl(argv); 7081da177e4SLinus Torvalds l = round_up_to_quad(o->len); 7091da177e4SLinus Torvalds if (argv->iov_len < l) 7101da177e4SLinus Torvalds return -1; 7111da177e4SLinus Torvalds o->data = argv->iov_base; 7121da177e4SLinus Torvalds argv->iov_base += l; 7131da177e4SLinus Torvalds argv->iov_len -= l; 7141da177e4SLinus Torvalds return 0; 7151da177e4SLinus Torvalds } 7161da177e4SLinus Torvalds 7171da177e4SLinus Torvalds static inline int 7181da177e4SLinus Torvalds svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) 7191da177e4SLinus Torvalds { 720753ed90dSAl Viro u8 *p; 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds if (resv->iov_len + 4 > PAGE_SIZE) 7231da177e4SLinus Torvalds return -1; 72476994313SAlexey Dobriyan svc_putnl(resv, o->len); 7251da177e4SLinus Torvalds p = resv->iov_base + resv->iov_len; 7261da177e4SLinus Torvalds resv->iov_len += round_up_to_quad(o->len); 7271da177e4SLinus Torvalds if (resv->iov_len > PAGE_SIZE) 7281da177e4SLinus Torvalds return -1; 7291da177e4SLinus Torvalds memcpy(p, o->data, o->len); 730753ed90dSAl Viro memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); 7311da177e4SLinus Torvalds return 0; 7321da177e4SLinus Torvalds } 7331da177e4SLinus Torvalds 73421fcd02bSJ. Bruce Fields /* 73521fcd02bSJ. Bruce Fields * Verify the checksum on the header and return SVC_OK on success. 7361da177e4SLinus Torvalds * Otherwise, return SVC_DROP (in the case of a bad sequence number) 737438623a0SChuck Lever * or return SVC_DENIED and indicate error in rqstp->rq_auth_stat. 7381da177e4SLinus Torvalds */ 7391da177e4SLinus Torvalds static int 7401da177e4SLinus Torvalds gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, 741438623a0SChuck Lever __be32 *rpcstart, struct rpc_gss_wire_cred *gc) 7421da177e4SLinus Torvalds { 7431da177e4SLinus Torvalds struct gss_ctx *ctx_id = rsci->mechctx; 7441da177e4SLinus Torvalds struct xdr_buf rpchdr; 7451da177e4SLinus Torvalds struct xdr_netobj checksum; 7461da177e4SLinus Torvalds u32 flavor = 0; 7471da177e4SLinus Torvalds struct kvec *argv = &rqstp->rq_arg.head[0]; 7481da177e4SLinus Torvalds struct kvec iov; 7491da177e4SLinus Torvalds 7501da177e4SLinus Torvalds /* data to compute the checksum over: */ 7511da177e4SLinus Torvalds iov.iov_base = rpcstart; 7521da177e4SLinus Torvalds iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; 7531da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &rpchdr); 7541da177e4SLinus Torvalds 755438623a0SChuck Lever rqstp->rq_auth_stat = rpc_autherr_badverf; 7561da177e4SLinus Torvalds if (argv->iov_len < 4) 7571da177e4SLinus Torvalds return SVC_DENIED; 75876994313SAlexey Dobriyan flavor = svc_getnl(argv); 7591da177e4SLinus Torvalds if (flavor != RPC_AUTH_GSS) 7601da177e4SLinus Torvalds return SVC_DENIED; 7611da177e4SLinus Torvalds if (svc_safe_getnetobj(argv, &checksum)) 7621da177e4SLinus Torvalds return SVC_DENIED; 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds if (rqstp->rq_deferred) /* skip verification of revisited request */ 7651da177e4SLinus Torvalds return SVC_OK; 76600fd6e14SJ. Bruce Fields if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { 767438623a0SChuck Lever rqstp->rq_auth_stat = rpcsec_gsserr_credproblem; 7681da177e4SLinus Torvalds return SVC_DENIED; 7691da177e4SLinus Torvalds } 7701da177e4SLinus Torvalds 7711da177e4SLinus Torvalds if (gc->gc_seq > MAXSEQ) { 77210b9d99aSChuck Lever trace_rpcgss_svc_seqno_large(rqstp, gc->gc_seq); 773438623a0SChuck Lever rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem; 7741da177e4SLinus Torvalds return SVC_DENIED; 7751da177e4SLinus Torvalds } 77610b9d99aSChuck Lever if (!gss_check_seq_num(rqstp, rsci, gc->gc_seq)) 7771da177e4SLinus Torvalds return SVC_DROP; 7781da177e4SLinus Torvalds return SVC_OK; 7791da177e4SLinus Torvalds } 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds static int 782822f1005SAndy Adamson gss_write_null_verf(struct svc_rqst *rqstp) 783822f1005SAndy Adamson { 784d8ed029dSAlexey Dobriyan __be32 *p; 785822f1005SAndy Adamson 78676994313SAlexey Dobriyan svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); 787822f1005SAndy Adamson p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 788822f1005SAndy Adamson /* don't really need to check if head->iov_len > PAGE_SIZE ... */ 789822f1005SAndy Adamson *p++ = 0; 790822f1005SAndy Adamson if (!xdr_ressize_check(rqstp, p)) 791822f1005SAndy Adamson return -1; 792822f1005SAndy Adamson return 0; 793822f1005SAndy Adamson } 794822f1005SAndy Adamson 795822f1005SAndy Adamson static int 7961da177e4SLinus Torvalds gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) 7971da177e4SLinus Torvalds { 7982876a344SJ. Bruce Fields __be32 *xdr_seq; 7991da177e4SLinus Torvalds u32 maj_stat; 8001da177e4SLinus Torvalds struct xdr_buf verf_data; 8011da177e4SLinus Torvalds struct xdr_netobj mic; 802d8ed029dSAlexey Dobriyan __be32 *p; 8031da177e4SLinus Torvalds struct kvec iov; 8042876a344SJ. Bruce Fields int err = -1; 8051da177e4SLinus Torvalds 80676994313SAlexey Dobriyan svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); 8072876a344SJ. Bruce Fields xdr_seq = kmalloc(4, GFP_KERNEL); 8082876a344SJ. Bruce Fields if (!xdr_seq) 809458032fcSYang Li return -ENOMEM; 8102876a344SJ. Bruce Fields *xdr_seq = htonl(seq); 8111da177e4SLinus Torvalds 8122876a344SJ. Bruce Fields iov.iov_base = xdr_seq; 8132876a344SJ. Bruce Fields iov.iov_len = 4; 8141da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_data); 8151da177e4SLinus Torvalds p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 8161da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 81700fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); 8181da177e4SLinus Torvalds if (maj_stat != GSS_S_COMPLETE) 8192876a344SJ. Bruce Fields goto out; 8201da177e4SLinus Torvalds *p++ = htonl(mic.len); 8211da177e4SLinus Torvalds memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); 8221da177e4SLinus Torvalds p += XDR_QUADLEN(mic.len); 8231da177e4SLinus Torvalds if (!xdr_ressize_check(rqstp, p)) 8242876a344SJ. Bruce Fields goto out; 8252876a344SJ. Bruce Fields err = 0; 8262876a344SJ. Bruce Fields out: 8272876a344SJ. Bruce Fields kfree(xdr_seq); 8282876a344SJ. Bruce Fields return err; 8291da177e4SLinus Torvalds } 8301da177e4SLinus Torvalds 8311da177e4SLinus Torvalds struct gss_domain { 8321da177e4SLinus Torvalds struct auth_domain h; 8331da177e4SLinus Torvalds u32 pseudoflavor; 8341da177e4SLinus Torvalds }; 8351da177e4SLinus Torvalds 8361da177e4SLinus Torvalds static struct auth_domain * 8371da177e4SLinus Torvalds find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) 8381da177e4SLinus Torvalds { 8391da177e4SLinus Torvalds char *name; 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvalds name = gss_service_to_auth_domain_name(ctx->mech_type, svc); 8421da177e4SLinus Torvalds if (!name) 8431da177e4SLinus Torvalds return NULL; 8441da177e4SLinus Torvalds return auth_domain_find(name); 8451da177e4SLinus Torvalds } 8461da177e4SLinus Torvalds 847efc36aa5SNeilBrown static struct auth_ops svcauthops_gss; 848efc36aa5SNeilBrown 8494796f457SJ. Bruce Fields u32 svcauth_gss_flavor(struct auth_domain *dom) 8504796f457SJ. Bruce Fields { 8514796f457SJ. Bruce Fields struct gss_domain *gd = container_of(dom, struct gss_domain, h); 8524796f457SJ. Bruce Fields 8534796f457SJ. Bruce Fields return gd->pseudoflavor; 8544796f457SJ. Bruce Fields } 8554796f457SJ. Bruce Fields 8567bd88269STrond Myklebust EXPORT_SYMBOL_GPL(svcauth_gss_flavor); 8574796f457SJ. Bruce Fields 85824c5efe4SNeilBrown struct auth_domain * 8591da177e4SLinus Torvalds svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) 8601da177e4SLinus Torvalds { 8611da177e4SLinus Torvalds struct gss_domain *new; 8621da177e4SLinus Torvalds struct auth_domain *test; 8631da177e4SLinus Torvalds int stat = -ENOMEM; 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds new = kmalloc(sizeof(*new), GFP_KERNEL); 8661da177e4SLinus Torvalds if (!new) 8671da177e4SLinus Torvalds goto out; 868efc36aa5SNeilBrown kref_init(&new->h.ref); 869e69062b4SArnaldo Carvalho de Melo new->h.name = kstrdup(name, GFP_KERNEL); 8701da177e4SLinus Torvalds if (!new->h.name) 8711da177e4SLinus Torvalds goto out_free_dom; 872efc36aa5SNeilBrown new->h.flavour = &svcauthops_gss; 8731da177e4SLinus Torvalds new->pseudoflavor = pseudoflavor; 8741da177e4SLinus Torvalds 875efc36aa5SNeilBrown test = auth_domain_lookup(name, &new->h); 876d47a5dc2SNeilBrown if (test != &new->h) { 877d47a5dc2SNeilBrown pr_warn("svc: duplicate registration of gss pseudo flavour %s.\n", 878d47a5dc2SNeilBrown name); 879d47a5dc2SNeilBrown stat = -EADDRINUSE; 880cb276805SJ. Bruce Fields auth_domain_put(test); 88124c5efe4SNeilBrown goto out_free_name; 8821da177e4SLinus Torvalds } 88324c5efe4SNeilBrown return test; 8841da177e4SLinus Torvalds 88524c5efe4SNeilBrown out_free_name: 88624c5efe4SNeilBrown kfree(new->h.name); 8871da177e4SLinus Torvalds out_free_dom: 8881da177e4SLinus Torvalds kfree(new); 8891da177e4SLinus Torvalds out: 89024c5efe4SNeilBrown return ERR_PTR(stat); 8911da177e4SLinus Torvalds } 8927bd88269STrond Myklebust EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor); 8931da177e4SLinus Torvalds 894e14673c9SChuck Lever /* 895e14673c9SChuck Lever * RFC 2203, Section 5.3.2.2 896e14673c9SChuck Lever * 897e14673c9SChuck Lever * struct rpc_gss_integ_data { 898e14673c9SChuck Lever * opaque databody_integ<>; 899e14673c9SChuck Lever * opaque checksum<>; 900e14673c9SChuck Lever * }; 901e14673c9SChuck Lever * 902e14673c9SChuck Lever * struct rpc_gss_data_t { 903e14673c9SChuck Lever * unsigned int seq_num; 904e14673c9SChuck Lever * proc_req_arg_t arg; 905e14673c9SChuck Lever * }; 906e14673c9SChuck Lever */ 907*b68e4c5cSChuck Lever static noinline_for_stack int 908*b68e4c5cSChuck Lever svcauth_gss_unwrap_integ(struct svc_rqst *rqstp, u32 seq, struct gss_ctx *ctx) 9091da177e4SLinus Torvalds { 9104dd9daa9SChuck Lever struct gss_svc_data *gsd = rqstp->rq_auth_data; 911*b68e4c5cSChuck Lever struct xdr_stream *xdr = &rqstp->rq_arg_stream; 912*b68e4c5cSChuck Lever u32 len, offset, seq_num, maj_stat; 913*b68e4c5cSChuck Lever struct xdr_buf *buf = xdr->buf; 914e14673c9SChuck Lever struct xdr_buf databody_integ; 915e14673c9SChuck Lever struct xdr_netobj checksum; 9161da177e4SLinus Torvalds 91706eb8a56SChuck Lever /* NFS READ normally uses splice to send data in-place. However 91806eb8a56SChuck Lever * the data in cache can change after the reply's MIC is computed 91906eb8a56SChuck Lever * but before the RPC reply is sent. To prevent the client from 92006eb8a56SChuck Lever * rejecting the server-computed MIC in this somewhat rare case, 92106eb8a56SChuck Lever * do not use splice with the GSS integrity service. 92206eb8a56SChuck Lever */ 9237827c81fSChuck Lever clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags); 92406eb8a56SChuck Lever 9254c190e2fSJeff Layton /* Did we already verify the signature on the original pass through? */ 9264c190e2fSJeff Layton if (rqstp->rq_deferred) 9274c190e2fSJeff Layton return 0; 9284c190e2fSJeff Layton 929*b68e4c5cSChuck Lever if (xdr_stream_decode_u32(xdr, &len) < 0) 930*b68e4c5cSChuck Lever goto unwrap_failed; 931e14673c9SChuck Lever if (len & 3) 93210b9d99aSChuck Lever goto unwrap_failed; 933*b68e4c5cSChuck Lever offset = xdr_stream_pos(xdr); 934*b68e4c5cSChuck Lever if (xdr_buf_subsegment(buf, &databody_integ, offset, len)) 93510b9d99aSChuck Lever goto unwrap_failed; 93610b9d99aSChuck Lever 937*b68e4c5cSChuck Lever /* 938*b68e4c5cSChuck Lever * The xdr_stream now points to the @seq_num field. The next 939*b68e4c5cSChuck Lever * XDR data item is the @arg field, which contains the clear 940*b68e4c5cSChuck Lever * text RPC program payload. The checksum, which follows the 941*b68e4c5cSChuck Lever * @arg field, is located and decoded without updating the 942*b68e4c5cSChuck Lever * xdr_stream. 943*b68e4c5cSChuck Lever */ 944*b68e4c5cSChuck Lever 945*b68e4c5cSChuck Lever offset += len; 946*b68e4c5cSChuck Lever if (xdr_decode_word(buf, offset, &checksum.len)) 94710b9d99aSChuck Lever goto unwrap_failed; 948e14673c9SChuck Lever if (checksum.len > sizeof(gsd->gsd_scratch)) 94910b9d99aSChuck Lever goto unwrap_failed; 950e14673c9SChuck Lever checksum.data = gsd->gsd_scratch; 951*b68e4c5cSChuck Lever if (read_bytes_from_xdr_buf(buf, offset + XDR_UNIT, checksum.data, 952*b68e4c5cSChuck Lever checksum.len)) 95310b9d99aSChuck Lever goto unwrap_failed; 954*b68e4c5cSChuck Lever 955e14673c9SChuck Lever maj_stat = gss_verify_mic(ctx, &databody_integ, &checksum); 9561da177e4SLinus Torvalds if (maj_stat != GSS_S_COMPLETE) 95710b9d99aSChuck Lever goto bad_mic; 958*b68e4c5cSChuck Lever 959*b68e4c5cSChuck Lever /* The received seqno is protected by the checksum. */ 960*b68e4c5cSChuck Lever if (xdr_stream_decode_u32(xdr, &seq_num) < 0) 961*b68e4c5cSChuck Lever goto unwrap_failed; 962e14673c9SChuck Lever if (seq_num != seq) 96310b9d99aSChuck Lever goto bad_seqno; 964*b68e4c5cSChuck Lever 965*b68e4c5cSChuck Lever xdr_truncate_decode(xdr, XDR_UNIT + checksum.len); 9664dd9daa9SChuck Lever return 0; 96710b9d99aSChuck Lever 96810b9d99aSChuck Lever unwrap_failed: 96910b9d99aSChuck Lever trace_rpcgss_svc_unwrap_failed(rqstp); 9704dd9daa9SChuck Lever return -EINVAL; 97110b9d99aSChuck Lever bad_seqno: 972e14673c9SChuck Lever trace_rpcgss_svc_seqno_bad(rqstp, seq, seq_num); 9734dd9daa9SChuck Lever return -EINVAL; 97410b9d99aSChuck Lever bad_mic: 97510b9d99aSChuck Lever trace_rpcgss_svc_mic(rqstp, maj_stat); 9764dd9daa9SChuck Lever return -EINVAL; 9771da177e4SLinus Torvalds } 9781da177e4SLinus Torvalds 9797c9fdcfbSJ. Bruce Fields static inline int 9807c9fdcfbSJ. Bruce Fields total_buf_len(struct xdr_buf *buf) 9817c9fdcfbSJ. Bruce Fields { 9827c9fdcfbSJ. Bruce Fields return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; 9837c9fdcfbSJ. Bruce Fields } 9847c9fdcfbSJ. Bruce Fields 9857c9fdcfbSJ. Bruce Fields static void 9867c9fdcfbSJ. Bruce Fields fix_priv_head(struct xdr_buf *buf, int pad) 9877c9fdcfbSJ. Bruce Fields { 9887c9fdcfbSJ. Bruce Fields if (buf->page_len == 0) { 9897c9fdcfbSJ. Bruce Fields /* We need to adjust head and buf->len in tandem in this 9907c9fdcfbSJ. Bruce Fields * case to make svc_defer() work--it finds the original 9917c9fdcfbSJ. Bruce Fields * buffer start using buf->len - buf->head[0].iov_len. */ 9927c9fdcfbSJ. Bruce Fields buf->head[0].iov_len -= pad; 9937c9fdcfbSJ. Bruce Fields } 9947c9fdcfbSJ. Bruce Fields } 9957c9fdcfbSJ. Bruce Fields 9967c9fdcfbSJ. Bruce Fields static int 9977c9fdcfbSJ. Bruce Fields unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 9987c9fdcfbSJ. Bruce Fields { 9997c9fdcfbSJ. Bruce Fields u32 priv_len, maj_stat; 100031c9590aSChuck Lever int pad, remaining_len, offset; 100110b9d99aSChuck Lever u32 rseqno; 10027c9fdcfbSJ. Bruce Fields 10037827c81fSChuck Lever clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags); 10047c9fdcfbSJ. Bruce Fields 100576994313SAlexey Dobriyan priv_len = svc_getnl(&buf->head[0]); 10067c9fdcfbSJ. Bruce Fields if (rqstp->rq_deferred) { 10077c9fdcfbSJ. Bruce Fields /* Already decrypted last time through! The sequence number 10087c9fdcfbSJ. Bruce Fields * check at out_seq is unnecessary but harmless: */ 10097c9fdcfbSJ. Bruce Fields goto out_seq; 10107c9fdcfbSJ. Bruce Fields } 10117c9fdcfbSJ. Bruce Fields /* buf->len is the number of bytes from the original start of the 10127c9fdcfbSJ. Bruce Fields * request to the end, where head[0].iov_len is just the bytes 10137c9fdcfbSJ. Bruce Fields * not yet read from the head, so these two values are different: */ 10147c9fdcfbSJ. Bruce Fields remaining_len = total_buf_len(buf); 10157c9fdcfbSJ. Bruce Fields if (priv_len > remaining_len) 101610b9d99aSChuck Lever goto unwrap_failed; 10177c9fdcfbSJ. Bruce Fields pad = remaining_len - priv_len; 10187c9fdcfbSJ. Bruce Fields buf->len -= pad; 10197c9fdcfbSJ. Bruce Fields fix_priv_head(buf, pad); 10207c9fdcfbSJ. Bruce Fields 102131c9590aSChuck Lever maj_stat = gss_unwrap(ctx, 0, priv_len, buf); 10227c9fdcfbSJ. Bruce Fields pad = priv_len - buf->len; 10237c9fdcfbSJ. Bruce Fields /* The upper layers assume the buffer is aligned on 4-byte boundaries. 10247c9fdcfbSJ. Bruce Fields * In the krb5p case, at least, the data ends up offset, so we need to 10257c9fdcfbSJ. Bruce Fields * move it around. */ 10267c9fdcfbSJ. Bruce Fields /* XXX: This is very inefficient. It would be better to either do 10277c9fdcfbSJ. Bruce Fields * this while we encrypt, or maybe in the receive code, if we can peak 10287c9fdcfbSJ. Bruce Fields * ahead and work out the service and mechanism there. */ 102996f194b7SChuck Lever offset = xdr_pad_size(buf->head[0].iov_len); 10307c9fdcfbSJ. Bruce Fields if (offset) { 10317c9fdcfbSJ. Bruce Fields buf->buflen = RPCSVC_MAXPAYLOAD; 10327c9fdcfbSJ. Bruce Fields xdr_shift_buf(buf, offset); 10337c9fdcfbSJ. Bruce Fields fix_priv_head(buf, pad); 10347c9fdcfbSJ. Bruce Fields } 10357c9fdcfbSJ. Bruce Fields if (maj_stat != GSS_S_COMPLETE) 103610b9d99aSChuck Lever goto bad_unwrap; 10377c9fdcfbSJ. Bruce Fields out_seq: 103810b9d99aSChuck Lever rseqno = svc_getnl(&buf->head[0]); 103910b9d99aSChuck Lever if (rseqno != seq) 104010b9d99aSChuck Lever goto bad_seqno; 10417c9fdcfbSJ. Bruce Fields return 0; 104210b9d99aSChuck Lever 104310b9d99aSChuck Lever unwrap_failed: 104410b9d99aSChuck Lever trace_rpcgss_svc_unwrap_failed(rqstp); 104510b9d99aSChuck Lever return -EINVAL; 104610b9d99aSChuck Lever bad_seqno: 104710b9d99aSChuck Lever trace_rpcgss_svc_seqno_bad(rqstp, seq, rseqno); 104810b9d99aSChuck Lever return -EINVAL; 104910b9d99aSChuck Lever bad_unwrap: 105010b9d99aSChuck Lever trace_rpcgss_svc_unwrap(rqstp, maj_stat); 105110b9d99aSChuck Lever return -EINVAL; 10527c9fdcfbSJ. Bruce Fields } 10537c9fdcfbSJ. Bruce Fields 10541da177e4SLinus Torvalds static int 10551da177e4SLinus Torvalds svcauth_gss_set_client(struct svc_rqst *rqstp) 10561da177e4SLinus Torvalds { 10571da177e4SLinus Torvalds struct gss_svc_data *svcdata = rqstp->rq_auth_data; 10581da177e4SLinus Torvalds struct rsc *rsci = svcdata->rsci; 10591da177e4SLinus Torvalds struct rpc_gss_wire_cred *gc = &svcdata->clcred; 10603ab4d8b1SJ. Bruce Fields int stat; 10611da177e4SLinus Torvalds 10625c2465dfSChuck Lever rqstp->rq_auth_stat = rpc_autherr_badcred; 10635c2465dfSChuck Lever 10643ab4d8b1SJ. Bruce Fields /* 10653ab4d8b1SJ. Bruce Fields * A gss export can be specified either by: 10663ab4d8b1SJ. Bruce Fields * export *(sec=krb5,rw) 10673ab4d8b1SJ. Bruce Fields * or by 10683ab4d8b1SJ. Bruce Fields * export gss/krb5(rw) 10693ab4d8b1SJ. Bruce Fields * The latter is deprecated; but for backwards compatibility reasons 10703ab4d8b1SJ. Bruce Fields * the nfsd code will still fall back on trying it if the former 10713ab4d8b1SJ. Bruce Fields * doesn't work; so we try to make both available to nfsd, below. 10723ab4d8b1SJ. Bruce Fields */ 10733ab4d8b1SJ. Bruce Fields rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); 10743ab4d8b1SJ. Bruce Fields if (rqstp->rq_gssclient == NULL) 10751da177e4SLinus Torvalds return SVC_DENIED; 10763ab4d8b1SJ. Bruce Fields stat = svcauth_unix_set_client(rqstp); 10771ebede86SNeilBrown if (stat == SVC_DROP || stat == SVC_CLOSE) 10783ab4d8b1SJ. Bruce Fields return stat; 10795c2465dfSChuck Lever 10805c2465dfSChuck Lever rqstp->rq_auth_stat = rpc_auth_ok; 10811da177e4SLinus Torvalds return SVC_OK; 10821da177e4SLinus Torvalds } 10831da177e4SLinus Torvalds 108491a4762eSKevin Coffman static inline int 1085fc2952a2SSimo Sorce gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp, 1086fc2952a2SSimo Sorce struct xdr_netobj *out_handle, int *major_status) 108791a4762eSKevin Coffman { 108891a4762eSKevin Coffman struct rsc *rsci; 108954f9247bSFrank Filz int rc; 109091a4762eSKevin Coffman 1091fc2952a2SSimo Sorce if (*major_status != GSS_S_COMPLETE) 109291a4762eSKevin Coffman return gss_write_null_verf(rqstp); 1093fc2952a2SSimo Sorce rsci = gss_svc_searchbyctx(cd, out_handle); 109491a4762eSKevin Coffman if (rsci == NULL) { 1095fc2952a2SSimo Sorce *major_status = GSS_S_NO_CONTEXT; 109691a4762eSKevin Coffman return gss_write_null_verf(rqstp); 109791a4762eSKevin Coffman } 109854f9247bSFrank Filz rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); 1099a1db410dSStanislav Kinsbursky cache_put(&rsci->h, cd); 110054f9247bSFrank Filz return rc; 110191a4762eSKevin Coffman } 110291a4762eSKevin Coffman 11035866efa8SChuck Lever static void gss_free_in_token_pages(struct gssp_in_token *in_token) 11045866efa8SChuck Lever { 11055866efa8SChuck Lever u32 inlen; 11065866efa8SChuck Lever int i; 11075866efa8SChuck Lever 11085866efa8SChuck Lever i = 0; 11095866efa8SChuck Lever inlen = in_token->page_len; 11105866efa8SChuck Lever while (inlen) { 11115866efa8SChuck Lever if (in_token->pages[i]) 11125866efa8SChuck Lever put_page(in_token->pages[i]); 11135866efa8SChuck Lever inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen; 11145866efa8SChuck Lever } 11155866efa8SChuck Lever 11165866efa8SChuck Lever kfree(in_token->pages); 11175866efa8SChuck Lever in_token->pages = NULL; 11185866efa8SChuck Lever } 11195866efa8SChuck Lever 11205866efa8SChuck Lever static int gss_read_proxy_verf(struct svc_rqst *rqstp, 1121438623a0SChuck Lever struct rpc_gss_wire_cred *gc, 1122030d794bSSimo Sorce struct xdr_netobj *in_handle, 1123030d794bSSimo Sorce struct gssp_in_token *in_token) 1124030d794bSSimo Sorce { 1125c020fa69SChuck Lever struct xdr_stream *xdr = &rqstp->rq_arg_stream; 1126d48c8124SMartijn de Gouw unsigned int length, pgto_offs, pgfrom_offs; 11274d51366dSChuck Lever int pages, i, pgto, pgfrom; 1128c020fa69SChuck Lever size_t to_offs, from_offs; 1129c020fa69SChuck Lever u32 inlen; 1130030d794bSSimo Sorce 11314d51366dSChuck Lever if (dup_netobj(in_handle, &gc->gc_ctx)) 11324d51366dSChuck Lever return SVC_CLOSE; 1133030d794bSSimo Sorce 1134c020fa69SChuck Lever /* 1135c020fa69SChuck Lever * RFC 2203 Section 5.2.2 1136c020fa69SChuck Lever * 1137c020fa69SChuck Lever * struct rpc_gss_init_arg { 1138c020fa69SChuck Lever * opaque gss_token<>; 1139c020fa69SChuck Lever * }; 1140c020fa69SChuck Lever */ 1141c020fa69SChuck Lever if (xdr_stream_decode_u32(xdr, &inlen) < 0) 1142c020fa69SChuck Lever goto out_denied_free; 1143c020fa69SChuck Lever if (inlen > xdr_stream_remaining(xdr)) 1144c020fa69SChuck Lever goto out_denied_free; 1145030d794bSSimo Sorce 11465866efa8SChuck Lever pages = DIV_ROUND_UP(inlen, PAGE_SIZE); 11475866efa8SChuck Lever in_token->pages = kcalloc(pages, sizeof(struct page *), GFP_KERNEL); 1148c020fa69SChuck Lever if (!in_token->pages) 1149c020fa69SChuck Lever goto out_denied_free; 11505866efa8SChuck Lever in_token->page_base = 0; 1151030d794bSSimo Sorce in_token->page_len = inlen; 11525866efa8SChuck Lever for (i = 0; i < pages; i++) { 11535866efa8SChuck Lever in_token->pages[i] = alloc_page(GFP_KERNEL); 11545866efa8SChuck Lever if (!in_token->pages[i]) { 11555866efa8SChuck Lever gss_free_in_token_pages(in_token); 1156c020fa69SChuck Lever goto out_denied_free; 11575866efa8SChuck Lever } 11585866efa8SChuck Lever } 1159030d794bSSimo Sorce 1160c020fa69SChuck Lever length = min_t(unsigned int, inlen, (char *)xdr->end - (char *)xdr->p); 1161c020fa69SChuck Lever memcpy(page_address(in_token->pages[0]), xdr->p, length); 11625866efa8SChuck Lever inlen -= length; 11635866efa8SChuck Lever 1164d48c8124SMartijn de Gouw to_offs = length; 1165d48c8124SMartijn de Gouw from_offs = rqstp->rq_arg.page_base; 11665866efa8SChuck Lever while (inlen) { 1167d48c8124SMartijn de Gouw pgto = to_offs >> PAGE_SHIFT; 1168d48c8124SMartijn de Gouw pgfrom = from_offs >> PAGE_SHIFT; 1169d48c8124SMartijn de Gouw pgto_offs = to_offs & ~PAGE_MASK; 1170d48c8124SMartijn de Gouw pgfrom_offs = from_offs & ~PAGE_MASK; 1171d48c8124SMartijn de Gouw 1172d48c8124SMartijn de Gouw length = min_t(unsigned int, inlen, 1173d48c8124SMartijn de Gouw min_t(unsigned int, PAGE_SIZE - pgto_offs, 1174d48c8124SMartijn de Gouw PAGE_SIZE - pgfrom_offs)); 1175d48c8124SMartijn de Gouw memcpy(page_address(in_token->pages[pgto]) + pgto_offs, 1176d48c8124SMartijn de Gouw page_address(rqstp->rq_arg.pages[pgfrom]) + pgfrom_offs, 11775866efa8SChuck Lever length); 11785866efa8SChuck Lever 1179d48c8124SMartijn de Gouw to_offs += length; 1180d48c8124SMartijn de Gouw from_offs += length; 11815866efa8SChuck Lever inlen -= length; 11825866efa8SChuck Lever } 1183030d794bSSimo Sorce return 0; 1184c020fa69SChuck Lever 1185c020fa69SChuck Lever out_denied_free: 1186c020fa69SChuck Lever kfree(in_handle->data); 1187c020fa69SChuck Lever return SVC_DENIED; 1188030d794bSSimo Sorce } 1189030d794bSSimo Sorce 1190fc2952a2SSimo Sorce static inline int 1191fc2952a2SSimo Sorce gss_write_resv(struct kvec *resv, size_t size_limit, 1192fc2952a2SSimo Sorce struct xdr_netobj *out_handle, struct xdr_netobj *out_token, 1193fc2952a2SSimo Sorce int major_status, int minor_status) 1194fc2952a2SSimo Sorce { 1195fc2952a2SSimo Sorce if (resv->iov_len + 4 > size_limit) 1196fc2952a2SSimo Sorce return -1; 1197fc2952a2SSimo Sorce svc_putnl(resv, RPC_SUCCESS); 1198fc2952a2SSimo Sorce if (svc_safe_putnetobj(resv, out_handle)) 1199fc2952a2SSimo Sorce return -1; 1200fc2952a2SSimo Sorce if (resv->iov_len + 3 * 4 > size_limit) 1201fc2952a2SSimo Sorce return -1; 1202fc2952a2SSimo Sorce svc_putnl(resv, major_status); 1203fc2952a2SSimo Sorce svc_putnl(resv, minor_status); 1204fc2952a2SSimo Sorce svc_putnl(resv, GSS_SEQ_WIN); 1205fc2952a2SSimo Sorce if (svc_safe_putnetobj(resv, out_token)) 1206fc2952a2SSimo Sorce return -1; 1207fc2952a2SSimo Sorce return 0; 1208fc2952a2SSimo Sorce } 1209fc2952a2SSimo Sorce 12101da177e4SLinus Torvalds /* 121121fcd02bSJ. Bruce Fields * Having read the cred already and found we're in the context 121221fcd02bSJ. Bruce Fields * initiation case, read the verifier and initiate (or check the results 121321fcd02bSJ. Bruce Fields * of) upcalls to userspace for help with context initiation. If 121421fcd02bSJ. Bruce Fields * the upcall results are available, write the verifier and result. 121521fcd02bSJ. Bruce Fields * Otherwise, drop the request pending an answer to the upcall. 121621fcd02bSJ. Bruce Fields */ 1217c020fa69SChuck Lever static int 1218c020fa69SChuck Lever svcauth_gss_legacy_init(struct svc_rqst *rqstp, 1219438623a0SChuck Lever struct rpc_gss_wire_cred *gc) 122021fcd02bSJ. Bruce Fields { 1221c020fa69SChuck Lever struct xdr_stream *xdr = &rqstp->rq_arg_stream; 122221fcd02bSJ. Bruce Fields struct kvec *resv = &rqstp->rq_res.head[0]; 122321fcd02bSJ. Bruce Fields struct rsi *rsip, rsikey; 1224c020fa69SChuck Lever __be32 *p; 1225c020fa69SChuck Lever u32 len; 1226980e5a40SJ. Bruce Fields int ret; 1227b8be5674SVasily Averin struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id); 122821fcd02bSJ. Bruce Fields 122921fcd02bSJ. Bruce Fields memset(&rsikey, 0, sizeof(rsikey)); 12301cbfb921SChuck Lever if (dup_netobj(&rsikey.in_handle, &gc->gc_ctx)) 12311cbfb921SChuck Lever return SVC_CLOSE; 1232c020fa69SChuck Lever 1233c020fa69SChuck Lever /* 1234c020fa69SChuck Lever * RFC 2203 Section 5.2.2 1235c020fa69SChuck Lever * 1236c020fa69SChuck Lever * struct rpc_gss_init_arg { 1237c020fa69SChuck Lever * opaque gss_token<>; 1238c020fa69SChuck Lever * }; 1239c020fa69SChuck Lever */ 1240c020fa69SChuck Lever if (xdr_stream_decode_u32(xdr, &len) < 0) { 12411cbfb921SChuck Lever kfree(rsikey.in_handle.data); 12421cbfb921SChuck Lever return SVC_DENIED; 12431cbfb921SChuck Lever } 1244c020fa69SChuck Lever p = xdr_inline_decode(xdr, len); 1245c020fa69SChuck Lever if (!p) { 1246c020fa69SChuck Lever kfree(rsikey.in_handle.data); 1247c020fa69SChuck Lever return SVC_DENIED; 1248c020fa69SChuck Lever } 1249c020fa69SChuck Lever rsikey.in_token.data = kmalloc(len, GFP_KERNEL); 1250c020fa69SChuck Lever if (ZERO_OR_NULL_PTR(rsikey.in_token.data)) { 12511cbfb921SChuck Lever kfree(rsikey.in_handle.data); 12521cbfb921SChuck Lever return SVC_CLOSE; 12531cbfb921SChuck Lever } 1254c020fa69SChuck Lever memcpy(rsikey.in_token.data, p, len); 1255c020fa69SChuck Lever rsikey.in_token.len = len; 125621fcd02bSJ. Bruce Fields 125721fcd02bSJ. Bruce Fields /* Perform upcall, or find upcall result: */ 1258a1db410dSStanislav Kinsbursky rsip = rsi_lookup(sn->rsi_cache, &rsikey); 125921fcd02bSJ. Bruce Fields rsi_free(&rsikey); 126021fcd02bSJ. Bruce Fields if (!rsip) 12611ebede86SNeilBrown return SVC_CLOSE; 1262a1db410dSStanislav Kinsbursky if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0) 126321fcd02bSJ. Bruce Fields /* No upcall result: */ 12641ebede86SNeilBrown return SVC_CLOSE; 12652ed5282cSNeilBrown 12661ebede86SNeilBrown ret = SVC_CLOSE; 126721fcd02bSJ. Bruce Fields /* Got an answer to the upcall; use it: */ 1268fc2952a2SSimo Sorce if (gss_write_init_verf(sn->rsc_cache, rqstp, 1269fc2952a2SSimo Sorce &rsip->out_handle, &rsip->major_status)) 1270980e5a40SJ. Bruce Fields goto out; 1271fc2952a2SSimo Sorce if (gss_write_resv(resv, PAGE_SIZE, 1272fc2952a2SSimo Sorce &rsip->out_handle, &rsip->out_token, 1273fc2952a2SSimo Sorce rsip->major_status, rsip->minor_status)) 1274980e5a40SJ. Bruce Fields goto out; 12752ed5282cSNeilBrown 1276980e5a40SJ. Bruce Fields ret = SVC_COMPLETE; 1277980e5a40SJ. Bruce Fields out: 1278a1db410dSStanislav Kinsbursky cache_put(&rsip->h, sn->rsi_cache); 1279980e5a40SJ. Bruce Fields return ret; 128021fcd02bSJ. Bruce Fields } 128121fcd02bSJ. Bruce Fields 1282030d794bSSimo Sorce static int gss_proxy_save_rsc(struct cache_detail *cd, 1283030d794bSSimo Sorce struct gssp_upcall_data *ud, 1284030d794bSSimo Sorce uint64_t *handle) 1285030d794bSSimo Sorce { 1286030d794bSSimo Sorce struct rsc rsci, *rscp = NULL; 1287030d794bSSimo Sorce static atomic64_t ctxhctr; 1288030d794bSSimo Sorce long long ctxh; 1289030d794bSSimo Sorce struct gss_api_mech *gm = NULL; 1290294ec5b8SArnd Bergmann time64_t expiry; 1291f6260b98SColin Ian King int status; 1292030d794bSSimo Sorce 1293030d794bSSimo Sorce memset(&rsci, 0, sizeof(rsci)); 1294030d794bSSimo Sorce /* context handle */ 1295030d794bSSimo Sorce status = -ENOMEM; 1296030d794bSSimo Sorce /* the handle needs to be just a unique id, 1297030d794bSSimo Sorce * use a static counter */ 1298030d794bSSimo Sorce ctxh = atomic64_inc_return(&ctxhctr); 1299030d794bSSimo Sorce 1300030d794bSSimo Sorce /* make a copy for the caller */ 1301030d794bSSimo Sorce *handle = ctxh; 1302030d794bSSimo Sorce 1303030d794bSSimo Sorce /* make a copy for the rsc cache */ 1304030d794bSSimo Sorce if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t))) 1305030d794bSSimo Sorce goto out; 1306030d794bSSimo Sorce rscp = rsc_lookup(cd, &rsci); 1307030d794bSSimo Sorce if (!rscp) 1308030d794bSSimo Sorce goto out; 1309030d794bSSimo Sorce 1310030d794bSSimo Sorce /* creds */ 1311030d794bSSimo Sorce if (!ud->found_creds) { 1312030d794bSSimo Sorce /* userspace seem buggy, we should always get at least a 1313030d794bSSimo Sorce * mapping to nobody */ 13143be34555SJ. Bruce Fields goto out; 1315030d794bSSimo Sorce } else { 13163d96208cSRoberto Bergantinos Corpas struct timespec64 boot; 1317030d794bSSimo Sorce 1318030d794bSSimo Sorce /* steal creds */ 1319030d794bSSimo Sorce rsci.cred = ud->creds; 1320030d794bSSimo Sorce memset(&ud->creds, 0, sizeof(struct svc_cred)); 1321030d794bSSimo Sorce 1322030d794bSSimo Sorce status = -EOPNOTSUPP; 1323030d794bSSimo Sorce /* get mech handle from OID */ 1324030d794bSSimo Sorce gm = gss_mech_get_by_OID(&ud->mech_oid); 1325030d794bSSimo Sorce if (!gm) 1326030d794bSSimo Sorce goto out; 13277193bd17SJ. Bruce Fields rsci.cred.cr_gss_mech = gm; 1328030d794bSSimo Sorce 1329030d794bSSimo Sorce status = -EINVAL; 1330030d794bSSimo Sorce /* mech-specific data: */ 1331030d794bSSimo Sorce status = gss_import_sec_context(ud->out_handle.data, 1332030d794bSSimo Sorce ud->out_handle.len, 1333030d794bSSimo Sorce gm, &rsci.mechctx, 1334030d794bSSimo Sorce &expiry, GFP_KERNEL); 1335030d794bSSimo Sorce if (status) 1336030d794bSSimo Sorce goto out; 13373d96208cSRoberto Bergantinos Corpas 13383d96208cSRoberto Bergantinos Corpas getboottime64(&boot); 13393d96208cSRoberto Bergantinos Corpas expiry -= boot.tv_sec; 1340030d794bSSimo Sorce } 1341030d794bSSimo Sorce 1342030d794bSSimo Sorce rsci.h.expiry_time = expiry; 1343030d794bSSimo Sorce rscp = rsc_update(cd, &rsci, rscp); 1344030d794bSSimo Sorce status = 0; 1345030d794bSSimo Sorce out: 1346030d794bSSimo Sorce rsc_free(&rsci); 1347030d794bSSimo Sorce if (rscp) 1348030d794bSSimo Sorce cache_put(&rscp->h, cd); 1349030d794bSSimo Sorce else 1350030d794bSSimo Sorce status = -ENOMEM; 1351030d794bSSimo Sorce return status; 1352030d794bSSimo Sorce } 1353030d794bSSimo Sorce 1354030d794bSSimo Sorce static int svcauth_gss_proxy_init(struct svc_rqst *rqstp, 1355438623a0SChuck Lever struct rpc_gss_wire_cred *gc) 1356030d794bSSimo Sorce { 1357030d794bSSimo Sorce struct kvec *resv = &rqstp->rq_res.head[0]; 1358030d794bSSimo Sorce struct xdr_netobj cli_handle; 1359030d794bSSimo Sorce struct gssp_upcall_data ud; 1360030d794bSSimo Sorce uint64_t handle; 1361030d794bSSimo Sorce int status; 1362030d794bSSimo Sorce int ret; 1363b8be5674SVasily Averin struct net *net = SVC_NET(rqstp); 1364030d794bSSimo Sorce struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1365030d794bSSimo Sorce 1366030d794bSSimo Sorce memset(&ud, 0, sizeof(ud)); 1367438623a0SChuck Lever ret = gss_read_proxy_verf(rqstp, gc, &ud.in_handle, &ud.in_token); 1368030d794bSSimo Sorce if (ret) 1369030d794bSSimo Sorce return ret; 1370030d794bSSimo Sorce 1371030d794bSSimo Sorce ret = SVC_CLOSE; 1372030d794bSSimo Sorce 1373030d794bSSimo Sorce /* Perform synchronous upcall to gss-proxy */ 1374030d794bSSimo Sorce status = gssp_accept_sec_context_upcall(net, &ud); 1375030d794bSSimo Sorce if (status) 1376030d794bSSimo Sorce goto out; 1377030d794bSSimo Sorce 137810b9d99aSChuck Lever trace_rpcgss_svc_accept_upcall(rqstp, ud.major_status, ud.minor_status); 1379030d794bSSimo Sorce 1380030d794bSSimo Sorce switch (ud.major_status) { 1381030d794bSSimo Sorce case GSS_S_CONTINUE_NEEDED: 1382030d794bSSimo Sorce cli_handle = ud.out_handle; 1383030d794bSSimo Sorce break; 1384030d794bSSimo Sorce case GSS_S_COMPLETE: 1385030d794bSSimo Sorce status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle); 138628155524SChuck Lever if (status) 1387030d794bSSimo Sorce goto out; 1388030d794bSSimo Sorce cli_handle.data = (u8 *)&handle; 1389030d794bSSimo Sorce cli_handle.len = sizeof(handle); 1390030d794bSSimo Sorce break; 1391030d794bSSimo Sorce default: 1392030d794bSSimo Sorce goto out; 1393030d794bSSimo Sorce } 1394030d794bSSimo Sorce 1395030d794bSSimo Sorce /* Got an answer to the upcall; use it: */ 1396030d794bSSimo Sorce if (gss_write_init_verf(sn->rsc_cache, rqstp, 139728155524SChuck Lever &cli_handle, &ud.major_status)) 1398030d794bSSimo Sorce goto out; 1399030d794bSSimo Sorce if (gss_write_resv(resv, PAGE_SIZE, 1400030d794bSSimo Sorce &cli_handle, &ud.out_token, 140128155524SChuck Lever ud.major_status, ud.minor_status)) 1402030d794bSSimo Sorce goto out; 1403030d794bSSimo Sorce 1404030d794bSSimo Sorce ret = SVC_COMPLETE; 1405030d794bSSimo Sorce out: 14065866efa8SChuck Lever gss_free_in_token_pages(&ud.in_token); 1407030d794bSSimo Sorce gssp_free_upcall_data(&ud); 1408030d794bSSimo Sorce return ret; 1409030d794bSSimo Sorce } 1410030d794bSSimo Sorce 14110fdc2678SJeff Layton /* 14120fdc2678SJeff Layton * Try to set the sn->use_gss_proxy variable to a new value. We only allow 14130fdc2678SJeff Layton * it to be changed if it's currently undefined (-1). If it's any other value 14140fdc2678SJeff Layton * then return -EBUSY unless the type wouldn't have changed anyway. 14150fdc2678SJeff Layton */ 14160fdc2678SJeff Layton static int set_gss_proxy(struct net *net, int type) 14170fdc2678SJeff Layton { 14180fdc2678SJeff Layton struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 14190fdc2678SJeff Layton int ret; 14200fdc2678SJeff Layton 14210fdc2678SJeff Layton WARN_ON_ONCE(type != 0 && type != 1); 14220fdc2678SJeff Layton ret = cmpxchg(&sn->use_gss_proxy, -1, type); 14230fdc2678SJeff Layton if (ret != -1 && ret != type) 14240fdc2678SJeff Layton return -EBUSY; 14250fdc2678SJeff Layton return 0; 14260fdc2678SJeff Layton } 1427030d794bSSimo Sorce 1428030d794bSSimo Sorce static bool use_gss_proxy(struct net *net) 1429030d794bSSimo Sorce { 1430030d794bSSimo Sorce struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1431030d794bSSimo Sorce 14320fdc2678SJeff Layton /* If use_gss_proxy is still undefined, then try to disable it */ 14330fdc2678SJeff Layton if (sn->use_gss_proxy == -1) 14340fdc2678SJeff Layton set_gss_proxy(net, 0); 1435030d794bSSimo Sorce return sn->use_gss_proxy; 1436030d794bSSimo Sorce } 1437030d794bSSimo Sorce 14384ac5e7a6SChuck Lever static noinline_for_stack int 14394ac5e7a6SChuck Lever svcauth_gss_proc_init(struct svc_rqst *rqstp, struct rpc_gss_wire_cred *gc) 14404ac5e7a6SChuck Lever { 1441c020fa69SChuck Lever struct xdr_stream *xdr = &rqstp->rq_arg_stream; 1442c020fa69SChuck Lever u32 flavor, len; 1443c020fa69SChuck Lever void *body; 144420ebe927SChuck Lever 1445c020fa69SChuck Lever svcxdr_init_decode(rqstp); 1446c020fa69SChuck Lever 1447c020fa69SChuck Lever /* Call's verf field: */ 1448c020fa69SChuck Lever if (xdr_stream_decode_opaque_auth(xdr, &flavor, &body, &len) < 0) 1449c020fa69SChuck Lever return SVC_GARBAGE; 1450c020fa69SChuck Lever if (flavor != RPC_AUTH_NULL || len != 0) { 1451c020fa69SChuck Lever rqstp->rq_auth_stat = rpc_autherr_badverf; 145220ebe927SChuck Lever return SVC_DENIED; 1453c020fa69SChuck Lever } 145420ebe927SChuck Lever 145520ebe927SChuck Lever if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) { 145620ebe927SChuck Lever rqstp->rq_auth_stat = rpc_autherr_badcred; 145720ebe927SChuck Lever return SVC_DENIED; 145820ebe927SChuck Lever } 145920ebe927SChuck Lever 14604ac5e7a6SChuck Lever if (!use_gss_proxy(SVC_NET(rqstp))) 14614ac5e7a6SChuck Lever return svcauth_gss_legacy_init(rqstp, gc); 14624ac5e7a6SChuck Lever return svcauth_gss_proxy_init(rqstp, gc); 14634ac5e7a6SChuck Lever } 14644ac5e7a6SChuck Lever 14650ff3bab5SJ. Bruce Fields #ifdef CONFIG_PROC_FS 14660ff3bab5SJ. Bruce Fields 1467030d794bSSimo Sorce static ssize_t write_gssp(struct file *file, const char __user *buf, 1468030d794bSSimo Sorce size_t count, loff_t *ppos) 1469030d794bSSimo Sorce { 1470359745d7SMuchun Song struct net *net = pde_data(file_inode(file)); 1471030d794bSSimo Sorce char tbuf[20]; 1472030d794bSSimo Sorce unsigned long i; 1473030d794bSSimo Sorce int res; 1474030d794bSSimo Sorce 1475030d794bSSimo Sorce if (*ppos || count > sizeof(tbuf)-1) 1476030d794bSSimo Sorce return -EINVAL; 1477030d794bSSimo Sorce if (copy_from_user(tbuf, buf, count)) 1478030d794bSSimo Sorce return -EFAULT; 1479030d794bSSimo Sorce 1480030d794bSSimo Sorce tbuf[count] = 0; 1481030d794bSSimo Sorce res = kstrtoul(tbuf, 0, &i); 1482030d794bSSimo Sorce if (res) 1483030d794bSSimo Sorce return res; 1484030d794bSSimo Sorce if (i != 1) 1485030d794bSSimo Sorce return -EINVAL; 1486a92e5eb1SJeff Layton res = set_gssp_clnt(net); 1487030d794bSSimo Sorce if (res) 1488030d794bSSimo Sorce return res; 1489a92e5eb1SJeff Layton res = set_gss_proxy(net, 1); 1490030d794bSSimo Sorce if (res) 1491030d794bSSimo Sorce return res; 1492030d794bSSimo Sorce return count; 1493030d794bSSimo Sorce } 1494030d794bSSimo Sorce 1495030d794bSSimo Sorce static ssize_t read_gssp(struct file *file, char __user *buf, 1496030d794bSSimo Sorce size_t count, loff_t *ppos) 1497030d794bSSimo Sorce { 1498359745d7SMuchun Song struct net *net = pde_data(file_inode(file)); 14991654a04cSJeff Layton struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1500030d794bSSimo Sorce unsigned long p = *ppos; 1501030d794bSSimo Sorce char tbuf[10]; 1502030d794bSSimo Sorce size_t len; 1503030d794bSSimo Sorce 15041654a04cSJeff Layton snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy); 1505030d794bSSimo Sorce len = strlen(tbuf); 1506030d794bSSimo Sorce if (p >= len) 1507030d794bSSimo Sorce return 0; 1508030d794bSSimo Sorce len -= p; 1509030d794bSSimo Sorce if (len > count) 1510030d794bSSimo Sorce len = count; 1511030d794bSSimo Sorce if (copy_to_user(buf, (void *)(tbuf+p), len)) 1512030d794bSSimo Sorce return -EFAULT; 1513030d794bSSimo Sorce *ppos += len; 1514030d794bSSimo Sorce return len; 1515030d794bSSimo Sorce } 1516030d794bSSimo Sorce 151797a32539SAlexey Dobriyan static const struct proc_ops use_gss_proxy_proc_ops = { 151897a32539SAlexey Dobriyan .proc_open = nonseekable_open, 151997a32539SAlexey Dobriyan .proc_write = write_gssp, 152097a32539SAlexey Dobriyan .proc_read = read_gssp, 1521030d794bSSimo Sorce }; 1522030d794bSSimo Sorce 1523030d794bSSimo Sorce static int create_use_gss_proxy_proc_entry(struct net *net) 1524030d794bSSimo Sorce { 1525030d794bSSimo Sorce struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1526030d794bSSimo Sorce struct proc_dir_entry **p = &sn->use_gssp_proc; 1527030d794bSSimo Sorce 1528030d794bSSimo Sorce sn->use_gss_proxy = -1; 1529d6444062SJoe Perches *p = proc_create_data("use-gss-proxy", S_IFREG | 0600, 1530030d794bSSimo Sorce sn->proc_net_rpc, 153197a32539SAlexey Dobriyan &use_gss_proxy_proc_ops, net); 1532030d794bSSimo Sorce if (!*p) 1533030d794bSSimo Sorce return -ENOMEM; 1534030d794bSSimo Sorce init_gssp_clnt(sn); 1535030d794bSSimo Sorce return 0; 1536030d794bSSimo Sorce } 1537030d794bSSimo Sorce 1538030d794bSSimo Sorce static void destroy_use_gss_proxy_proc_entry(struct net *net) 1539030d794bSSimo Sorce { 1540030d794bSSimo Sorce struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1541030d794bSSimo Sorce 1542030d794bSSimo Sorce if (sn->use_gssp_proc) { 1543030d794bSSimo Sorce remove_proc_entry("use-gss-proxy", sn->proc_net_rpc); 1544030d794bSSimo Sorce clear_gssp_clnt(sn); 1545030d794bSSimo Sorce } 1546030d794bSSimo Sorce } 15470ff3bab5SJ. Bruce Fields #else /* CONFIG_PROC_FS */ 15480ff3bab5SJ. Bruce Fields 15490ff3bab5SJ. Bruce Fields static int create_use_gss_proxy_proc_entry(struct net *net) 15500ff3bab5SJ. Bruce Fields { 15510ff3bab5SJ. Bruce Fields return 0; 15520ff3bab5SJ. Bruce Fields } 15530ff3bab5SJ. Bruce Fields 15540ff3bab5SJ. Bruce Fields static void destroy_use_gss_proxy_proc_entry(struct net *net) {} 1555030d794bSSimo Sorce 1556030d794bSSimo Sorce #endif /* CONFIG_PROC_FS */ 1557030d794bSSimo Sorce 155821fcd02bSJ. Bruce Fields /* 15591da177e4SLinus Torvalds * Accept an rpcsec packet. 15601da177e4SLinus Torvalds * If context establishment, punt to user space 15611da177e4SLinus Torvalds * If data exchange, verify/decrypt 15621da177e4SLinus Torvalds * If context destruction, handle here 15631da177e4SLinus Torvalds * In the context establishment and destruction case we encode 15641da177e4SLinus Torvalds * response here and return SVC_COMPLETE. 15651da177e4SLinus Torvalds */ 15661da177e4SLinus Torvalds static int 1567438623a0SChuck Lever svcauth_gss_accept(struct svc_rqst *rqstp) 15681da177e4SLinus Torvalds { 15691da177e4SLinus Torvalds struct kvec *argv = &rqstp->rq_arg.head[0]; 15701da177e4SLinus Torvalds struct kvec *resv = &rqstp->rq_res.head[0]; 15711da177e4SLinus Torvalds u32 crlen; 15721da177e4SLinus Torvalds struct gss_svc_data *svcdata = rqstp->rq_auth_data; 15731da177e4SLinus Torvalds struct rpc_gss_wire_cred *gc; 15741da177e4SLinus Torvalds struct rsc *rsci = NULL; 1575d8ed029dSAlexey Dobriyan __be32 *rpcstart; 1576d8ed029dSAlexey Dobriyan __be32 *reject_stat = resv->iov_base + resv->iov_len; 15771da177e4SLinus Torvalds int ret; 1578b8be5674SVasily Averin struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id); 15791da177e4SLinus Torvalds 1580438623a0SChuck Lever rqstp->rq_auth_stat = rpc_autherr_badcred; 15811da177e4SLinus Torvalds if (!svcdata) 15821da177e4SLinus Torvalds svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); 15831da177e4SLinus Torvalds if (!svcdata) 15841da177e4SLinus Torvalds goto auth_err; 15851da177e4SLinus Torvalds rqstp->rq_auth_data = svcdata; 15865b304bc5SJ.Bruce Fields svcdata->verf_start = NULL; 15871da177e4SLinus Torvalds svcdata->rsci = NULL; 15881da177e4SLinus Torvalds gc = &svcdata->clcred; 15891da177e4SLinus Torvalds 15901da177e4SLinus Torvalds /* start of rpc packet is 7 u32's back from here: 15911da177e4SLinus Torvalds * xid direction rpcversion prog vers proc flavour 15921da177e4SLinus Torvalds */ 15931da177e4SLinus Torvalds rpcstart = argv->iov_base; 15941da177e4SLinus Torvalds rpcstart -= 7; 15951da177e4SLinus Torvalds 15961da177e4SLinus Torvalds /* credential is: 15971da177e4SLinus Torvalds * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle 159825985edcSLucas De Marchi * at least 5 u32s, and is preceded by length, so that makes 6. 15991da177e4SLinus Torvalds */ 16001da177e4SLinus Torvalds 16011da177e4SLinus Torvalds if (argv->iov_len < 5 * 4) 16021da177e4SLinus Torvalds goto auth_err; 160376994313SAlexey Dobriyan crlen = svc_getnl(argv); 160476994313SAlexey Dobriyan if (svc_getnl(argv) != RPC_GSS_VERSION) 16051da177e4SLinus Torvalds goto auth_err; 160676994313SAlexey Dobriyan gc->gc_proc = svc_getnl(argv); 160776994313SAlexey Dobriyan gc->gc_seq = svc_getnl(argv); 160876994313SAlexey Dobriyan gc->gc_svc = svc_getnl(argv); 16091da177e4SLinus Torvalds if (svc_safe_getnetobj(argv, &gc->gc_ctx)) 16101da177e4SLinus Torvalds goto auth_err; 16111da177e4SLinus Torvalds if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) 16121da177e4SLinus Torvalds goto auth_err; 16131da177e4SLinus Torvalds 16141da177e4SLinus Torvalds if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) 16151da177e4SLinus Torvalds goto auth_err; 16161da177e4SLinus Torvalds 1617438623a0SChuck Lever rqstp->rq_auth_stat = rpc_autherr_badverf; 16181da177e4SLinus Torvalds switch (gc->gc_proc) { 16191da177e4SLinus Torvalds case RPC_GSS_PROC_INIT: 16201da177e4SLinus Torvalds case RPC_GSS_PROC_CONTINUE_INIT: 16214ac5e7a6SChuck Lever return svcauth_gss_proc_init(rqstp, gc); 16221da177e4SLinus Torvalds case RPC_GSS_PROC_DATA: 16231da177e4SLinus Torvalds case RPC_GSS_PROC_DESTROY: 162421fcd02bSJ. Bruce Fields /* Look up the context, and check the verifier: */ 1625438623a0SChuck Lever rqstp->rq_auth_stat = rpcsec_gsserr_credproblem; 1626a1db410dSStanislav Kinsbursky rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx); 16271da177e4SLinus Torvalds if (!rsci) 16281da177e4SLinus Torvalds goto auth_err; 1629438623a0SChuck Lever switch (gss_verify_header(rqstp, rsci, rpcstart, gc)) { 16301da177e4SLinus Torvalds case SVC_OK: 16311da177e4SLinus Torvalds break; 16321da177e4SLinus Torvalds case SVC_DENIED: 16331da177e4SLinus Torvalds goto auth_err; 16341da177e4SLinus Torvalds case SVC_DROP: 16351da177e4SLinus Torvalds goto drop; 16361da177e4SLinus Torvalds } 16371da177e4SLinus Torvalds break; 16381da177e4SLinus Torvalds default: 1639438623a0SChuck Lever rqstp->rq_auth_stat = rpc_autherr_rejectedcred; 16401da177e4SLinus Torvalds goto auth_err; 16411da177e4SLinus Torvalds } 16421da177e4SLinus Torvalds 16431da177e4SLinus Torvalds /* now act upon the command: */ 16441da177e4SLinus Torvalds switch (gc->gc_proc) { 16451da177e4SLinus Torvalds case RPC_GSS_PROC_DESTROY: 1646c5e434c9SWei Yongjun if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1647c5e434c9SWei Yongjun goto auth_err; 16482b477c00SNeil Brown /* Delete the entry from the cache_list and call cache_put */ 16492b477c00SNeil Brown sunrpc_cache_unhash(sn->rsc_cache, &rsci->h); 16501da177e4SLinus Torvalds if (resv->iov_len + 4 > PAGE_SIZE) 16511da177e4SLinus Torvalds goto drop; 165276994313SAlexey Dobriyan svc_putnl(resv, RPC_SUCCESS); 16531da177e4SLinus Torvalds goto complete; 16541da177e4SLinus Torvalds case RPC_GSS_PROC_DATA: 1655438623a0SChuck Lever rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem; 16565b304bc5SJ.Bruce Fields svcdata->verf_start = resv->iov_base + resv->iov_len; 16571da177e4SLinus Torvalds if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 16581da177e4SLinus Torvalds goto auth_err; 16591da177e4SLinus Torvalds rqstp->rq_cred = rsci->cred; 16601da177e4SLinus Torvalds get_group_info(rsci->cred.cr_group_info); 1661438623a0SChuck Lever rqstp->rq_auth_stat = rpc_autherr_badcred; 16621da177e4SLinus Torvalds switch (gc->gc_svc) { 16631da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 16641e9e177dSChuck Lever svcxdr_init_decode(rqstp); 16651da177e4SLinus Torvalds break; 16661da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 1667b620754bSJ. Bruce Fields /* placeholders for length and seq. number: */ 1668b620754bSJ. Bruce Fields svc_putnl(resv, 0); 1669b620754bSJ. Bruce Fields svc_putnl(resv, 0); 1670*b68e4c5cSChuck Lever svcxdr_init_decode(rqstp); 1671*b68e4c5cSChuck Lever if (svcauth_gss_unwrap_integ(rqstp, gc->gc_seq, 1672*b68e4c5cSChuck Lever rsci->mechctx)) 1673dd35210eSHarshula Jayasuriya goto garbage_args; 1674a5cddc88SJ. Bruce Fields rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE; 1675b620754bSJ. Bruce Fields break; 1676b620754bSJ. Bruce Fields case RPC_GSS_SVC_PRIVACY: 16771da177e4SLinus Torvalds /* placeholders for length and seq. number: */ 167876994313SAlexey Dobriyan svc_putnl(resv, 0); 167976994313SAlexey Dobriyan svc_putnl(resv, 0); 16807c9fdcfbSJ. Bruce Fields if (unwrap_priv_data(rqstp, &rqstp->rq_arg, 16817c9fdcfbSJ. Bruce Fields gc->gc_seq, rsci->mechctx)) 1682dd35210eSHarshula Jayasuriya goto garbage_args; 1683a5cddc88SJ. Bruce Fields rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2; 16841e9e177dSChuck Lever svcxdr_init_decode(rqstp); 16857c9fdcfbSJ. Bruce Fields break; 16861da177e4SLinus Torvalds default: 16871da177e4SLinus Torvalds goto auth_err; 16881da177e4SLinus Torvalds } 16891da177e4SLinus Torvalds svcdata->rsci = rsci; 16901da177e4SLinus Torvalds cache_get(&rsci->h); 1691d5497fc6SJ. Bruce Fields rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor( 169283523d08SChuck Lever rsci->mechctx->mech_type, 169383523d08SChuck Lever GSS_C_QOP_DEFAULT, 169483523d08SChuck Lever gc->gc_svc); 16951da177e4SLinus Torvalds ret = SVC_OK; 169610b9d99aSChuck Lever trace_rpcgss_svc_authenticate(rqstp, gc); 16971da177e4SLinus Torvalds goto out; 16981da177e4SLinus Torvalds } 1699dd35210eSHarshula Jayasuriya garbage_args: 1700dd35210eSHarshula Jayasuriya ret = SVC_GARBAGE; 1701dd35210eSHarshula Jayasuriya goto out; 17021da177e4SLinus Torvalds auth_err: 170321fcd02bSJ. Bruce Fields /* Restore write pointer to its original value: */ 17041da177e4SLinus Torvalds xdr_ressize_check(rqstp, reject_stat); 17051da177e4SLinus Torvalds ret = SVC_DENIED; 17061da177e4SLinus Torvalds goto out; 17071da177e4SLinus Torvalds complete: 17081da177e4SLinus Torvalds ret = SVC_COMPLETE; 17091da177e4SLinus Torvalds goto out; 17101da177e4SLinus Torvalds drop: 17114d712ef1SChuck Lever ret = SVC_CLOSE; 17121da177e4SLinus Torvalds out: 17131da177e4SLinus Torvalds if (rsci) 1714a1db410dSStanislav Kinsbursky cache_put(&rsci->h, sn->rsc_cache); 17151da177e4SLinus Torvalds return ret; 17161da177e4SLinus Torvalds } 17171da177e4SLinus Torvalds 1718cfbdbab0SAl Viro static __be32 * 17193c15a486SJ.Bruce Fields svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) 17203c15a486SJ.Bruce Fields { 1721cfbdbab0SAl Viro __be32 *p; 1722cfbdbab0SAl Viro u32 verf_len; 17233c15a486SJ.Bruce Fields 17245b304bc5SJ.Bruce Fields p = gsd->verf_start; 17255b304bc5SJ.Bruce Fields gsd->verf_start = NULL; 17265b304bc5SJ.Bruce Fields 17275b304bc5SJ.Bruce Fields /* If the reply stat is nonzero, don't wrap: */ 17285b304bc5SJ.Bruce Fields if (*(p-1) != rpc_success) 17295b304bc5SJ.Bruce Fields return NULL; 17305b304bc5SJ.Bruce Fields /* Skip the verifier: */ 17315b304bc5SJ.Bruce Fields p += 1; 17325b304bc5SJ.Bruce Fields verf_len = ntohl(*p++); 17335b304bc5SJ.Bruce Fields p += XDR_QUADLEN(verf_len); 17343c15a486SJ.Bruce Fields /* move accept_stat to right place: */ 17353c15a486SJ.Bruce Fields memcpy(p, p + 2, 4); 17365b304bc5SJ.Bruce Fields /* Also don't wrap if the accept stat is nonzero: */ 17373c15a486SJ.Bruce Fields if (*p != rpc_success) { 17383c15a486SJ.Bruce Fields resbuf->head[0].iov_len -= 2 * 4; 17393c15a486SJ.Bruce Fields return NULL; 17403c15a486SJ.Bruce Fields } 17413c15a486SJ.Bruce Fields p++; 17423c15a486SJ.Bruce Fields return p; 17433c15a486SJ.Bruce Fields } 17443c15a486SJ.Bruce Fields 1745e142ede8SJ. Bruce Fields static inline int 1746e142ede8SJ. Bruce Fields svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) 17471da177e4SLinus Torvalds { 17481da177e4SLinus Torvalds struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 17491da177e4SLinus Torvalds struct rpc_gss_wire_cred *gc = &gsd->clcred; 17501da177e4SLinus Torvalds struct xdr_buf *resbuf = &rqstp->rq_res; 17511da177e4SLinus Torvalds struct xdr_buf integ_buf; 17521da177e4SLinus Torvalds struct xdr_netobj mic; 17531da177e4SLinus Torvalds struct kvec *resv; 1754d8ed029dSAlexey Dobriyan __be32 *p; 17551da177e4SLinus Torvalds int integ_offset, integ_len; 17561da177e4SLinus Torvalds int stat = -EINVAL; 17571da177e4SLinus Torvalds 17583c15a486SJ.Bruce Fields p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 17593c15a486SJ.Bruce Fields if (p == NULL) 17601da177e4SLinus Torvalds goto out; 17611da177e4SLinus Torvalds integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; 17621da177e4SLinus Torvalds integ_len = resbuf->len - integ_offset; 176396f194b7SChuck Lever if (integ_len & 3) 176496f194b7SChuck Lever goto out; 17651da177e4SLinus Torvalds *p++ = htonl(integ_len); 17661da177e4SLinus Torvalds *p++ = htonl(gc->gc_seq); 17671754eb2bSJ. Bruce Fields if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) { 17681754eb2bSJ. Bruce Fields WARN_ON_ONCE(1); 17691754eb2bSJ. Bruce Fields goto out_err; 17701754eb2bSJ. Bruce Fields } 1771153e44d2SNeilBrown if (resbuf->tail[0].iov_base == NULL) { 1772e142ede8SJ. Bruce Fields if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1773dfee55f0SNeilBrown goto out_err; 1774e142ede8SJ. Bruce Fields resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1775dfee55f0SNeilBrown + resbuf->head[0].iov_len; 17761da177e4SLinus Torvalds resbuf->tail[0].iov_len = 0; 17771da177e4SLinus Torvalds } 1778bba0f88bSJ. Bruce Fields resv = &resbuf->tail[0]; 17791da177e4SLinus Torvalds mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; 178000fd6e14SJ. Bruce Fields if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) 17811da177e4SLinus Torvalds goto out_err; 178276994313SAlexey Dobriyan svc_putnl(resv, mic.len); 17831da177e4SLinus Torvalds memset(mic.data + mic.len, 0, 17841da177e4SLinus Torvalds round_up_to_quad(mic.len) - mic.len); 17851da177e4SLinus Torvalds resv->iov_len += XDR_QUADLEN(mic.len) << 2; 17861da177e4SLinus Torvalds /* not strictly required: */ 17871da177e4SLinus Torvalds resbuf->len += XDR_QUADLEN(mic.len) << 2; 178828155524SChuck Lever if (resv->iov_len > PAGE_SIZE) 178928155524SChuck Lever goto out_err; 1790e142ede8SJ. Bruce Fields out: 1791e142ede8SJ. Bruce Fields stat = 0; 1792e142ede8SJ. Bruce Fields out_err: 1793e142ede8SJ. Bruce Fields return stat; 1794e142ede8SJ. Bruce Fields } 1795e142ede8SJ. Bruce Fields 17967c9fdcfbSJ. Bruce Fields static inline int 17977c9fdcfbSJ. Bruce Fields svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) 17987c9fdcfbSJ. Bruce Fields { 17997c9fdcfbSJ. Bruce Fields struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 18007c9fdcfbSJ. Bruce Fields struct rpc_gss_wire_cred *gc = &gsd->clcred; 18017c9fdcfbSJ. Bruce Fields struct xdr_buf *resbuf = &rqstp->rq_res; 18027c9fdcfbSJ. Bruce Fields struct page **inpages = NULL; 1803753ed90dSAl Viro __be32 *p, *len; 1804753ed90dSAl Viro int offset; 18057c9fdcfbSJ. Bruce Fields int pad; 18067c9fdcfbSJ. Bruce Fields 18073c15a486SJ.Bruce Fields p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 18083c15a486SJ.Bruce Fields if (p == NULL) 18097c9fdcfbSJ. Bruce Fields return 0; 18107c9fdcfbSJ. Bruce Fields len = p++; 18117c9fdcfbSJ. Bruce Fields offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; 18127c9fdcfbSJ. Bruce Fields *p++ = htonl(gc->gc_seq); 18137c9fdcfbSJ. Bruce Fields inpages = resbuf->pages; 18147c9fdcfbSJ. Bruce Fields /* XXX: Would be better to write some xdr helper functions for 18157c9fdcfbSJ. Bruce Fields * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ 18167561042fSKevin Coffman 18177561042fSKevin Coffman /* 18187561042fSKevin Coffman * If there is currently tail data, make sure there is 18197561042fSKevin Coffman * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in 18207561042fSKevin Coffman * the page, and move the current tail data such that 18217561042fSKevin Coffman * there is RPC_MAX_AUTH_SIZE slack space available in 18227561042fSKevin Coffman * both the head and tail. 18237561042fSKevin Coffman */ 182444524359SNeilBrown if (resbuf->tail[0].iov_base) { 182528155524SChuck Lever if (resbuf->tail[0].iov_base >= 182628155524SChuck Lever resbuf->head[0].iov_base + PAGE_SIZE) 182728155524SChuck Lever return -EINVAL; 182828155524SChuck Lever if (resbuf->tail[0].iov_base < resbuf->head[0].iov_base) 182928155524SChuck Lever return -EINVAL; 18307c9fdcfbSJ. Bruce Fields if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len 18317c9fdcfbSJ. Bruce Fields + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) 18327c9fdcfbSJ. Bruce Fields return -ENOMEM; 18337c9fdcfbSJ. Bruce Fields memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, 18347c9fdcfbSJ. Bruce Fields resbuf->tail[0].iov_base, 18357c9fdcfbSJ. Bruce Fields resbuf->tail[0].iov_len); 18367c9fdcfbSJ. Bruce Fields resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; 18377c9fdcfbSJ. Bruce Fields } 18387561042fSKevin Coffman /* 18397561042fSKevin Coffman * If there is no current tail data, make sure there is 18407561042fSKevin Coffman * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the 18417561042fSKevin Coffman * allotted page, and set up tail information such that there 18427561042fSKevin Coffman * is RPC_MAX_AUTH_SIZE slack space available in both the 18437561042fSKevin Coffman * head and tail. 18447561042fSKevin Coffman */ 18457c9fdcfbSJ. Bruce Fields if (resbuf->tail[0].iov_base == NULL) { 18467c9fdcfbSJ. Bruce Fields if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) 18477c9fdcfbSJ. Bruce Fields return -ENOMEM; 18487c9fdcfbSJ. Bruce Fields resbuf->tail[0].iov_base = resbuf->head[0].iov_base 18497c9fdcfbSJ. Bruce Fields + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; 18507c9fdcfbSJ. Bruce Fields resbuf->tail[0].iov_len = 0; 18517c9fdcfbSJ. Bruce Fields } 18527c9fdcfbSJ. Bruce Fields if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) 18537c9fdcfbSJ. Bruce Fields return -ENOMEM; 18547c9fdcfbSJ. Bruce Fields *len = htonl(resbuf->len - offset); 18557c9fdcfbSJ. Bruce Fields pad = 3 - ((resbuf->len - offset - 1)&3); 1856d8ed029dSAlexey Dobriyan p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); 18577c9fdcfbSJ. Bruce Fields memset(p, 0, pad); 18587c9fdcfbSJ. Bruce Fields resbuf->tail[0].iov_len += pad; 18597c9fdcfbSJ. Bruce Fields resbuf->len += pad; 18607c9fdcfbSJ. Bruce Fields return 0; 18617c9fdcfbSJ. Bruce Fields } 18627c9fdcfbSJ. Bruce Fields 1863e142ede8SJ. Bruce Fields static int 1864e142ede8SJ. Bruce Fields svcauth_gss_release(struct svc_rqst *rqstp) 1865e142ede8SJ. Bruce Fields { 1866e142ede8SJ. Bruce Fields struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 18670ddc9423SJ. Bruce Fields struct rpc_gss_wire_cred *gc; 1868e142ede8SJ. Bruce Fields struct xdr_buf *resbuf = &rqstp->rq_res; 1869e142ede8SJ. Bruce Fields int stat = -EINVAL; 1870b8be5674SVasily Averin struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id); 1871e142ede8SJ. Bruce Fields 18720ddc9423SJ. Bruce Fields if (!gsd) 18730ddc9423SJ. Bruce Fields goto out; 18740ddc9423SJ. Bruce Fields gc = &gsd->clcred; 1875e142ede8SJ. Bruce Fields if (gc->gc_proc != RPC_GSS_PROC_DATA) 1876e142ede8SJ. Bruce Fields goto out; 1877e142ede8SJ. Bruce Fields /* Release can be called twice, but we only wrap once. */ 18785b304bc5SJ.Bruce Fields if (gsd->verf_start == NULL) 1879e142ede8SJ. Bruce Fields goto out; 1880e142ede8SJ. Bruce Fields /* normally not set till svc_send, but we need it here: */ 18817c9fdcfbSJ. Bruce Fields /* XXX: what for? Do we mess it up the moment we call svc_putu32 18827c9fdcfbSJ. Bruce Fields * or whatever? */ 18837c9fdcfbSJ. Bruce Fields resbuf->len = total_buf_len(resbuf); 1884e142ede8SJ. Bruce Fields switch (gc->gc_svc) { 1885e142ede8SJ. Bruce Fields case RPC_GSS_SVC_NONE: 1886e142ede8SJ. Bruce Fields break; 1887e142ede8SJ. Bruce Fields case RPC_GSS_SVC_INTEGRITY: 18887c9fdcfbSJ. Bruce Fields stat = svcauth_gss_wrap_resp_integ(rqstp); 18897c9fdcfbSJ. Bruce Fields if (stat) 18907c9fdcfbSJ. Bruce Fields goto out_err; 18911da177e4SLinus Torvalds break; 18921da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 18937c9fdcfbSJ. Bruce Fields stat = svcauth_gss_wrap_resp_priv(rqstp); 18947c9fdcfbSJ. Bruce Fields if (stat) 18957c9fdcfbSJ. Bruce Fields goto out_err; 18967c9fdcfbSJ. Bruce Fields break; 1897eac81736SWei Yongjun /* 1898eac81736SWei Yongjun * For any other gc_svc value, svcauth_gss_accept() already set 1899eac81736SWei Yongjun * the auth_error appropriately; just fall through: 1900eac81736SWei Yongjun */ 19011da177e4SLinus Torvalds } 19021da177e4SLinus Torvalds 19031da177e4SLinus Torvalds out: 19041da177e4SLinus Torvalds stat = 0; 19051da177e4SLinus Torvalds out_err: 19061da177e4SLinus Torvalds if (rqstp->rq_client) 19071da177e4SLinus Torvalds auth_domain_put(rqstp->rq_client); 19081da177e4SLinus Torvalds rqstp->rq_client = NULL; 19093ab4d8b1SJ. Bruce Fields if (rqstp->rq_gssclient) 19103ab4d8b1SJ. Bruce Fields auth_domain_put(rqstp->rq_gssclient); 19113ab4d8b1SJ. Bruce Fields rqstp->rq_gssclient = NULL; 19121da177e4SLinus Torvalds if (rqstp->rq_cred.cr_group_info) 19131da177e4SLinus Torvalds put_group_info(rqstp->rq_cred.cr_group_info); 19141da177e4SLinus Torvalds rqstp->rq_cred.cr_group_info = NULL; 19150ddc9423SJ. Bruce Fields if (gsd && gsd->rsci) { 1916a1db410dSStanislav Kinsbursky cache_put(&gsd->rsci->h, sn->rsc_cache); 19171da177e4SLinus Torvalds gsd->rsci = NULL; 19180ddc9423SJ. Bruce Fields } 19191da177e4SLinus Torvalds return stat; 19201da177e4SLinus Torvalds } 19211da177e4SLinus Torvalds 19221da177e4SLinus Torvalds static void 1923608a0ab2STrond Myklebust svcauth_gss_domain_release_rcu(struct rcu_head *head) 19241da177e4SLinus Torvalds { 1925608a0ab2STrond Myklebust struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head); 19261da177e4SLinus Torvalds struct gss_domain *gd = container_of(dom, struct gss_domain, h); 19271da177e4SLinus Torvalds 19281da177e4SLinus Torvalds kfree(dom->name); 19291da177e4SLinus Torvalds kfree(gd); 19301da177e4SLinus Torvalds } 19311da177e4SLinus Torvalds 1932608a0ab2STrond Myklebust static void 1933608a0ab2STrond Myklebust svcauth_gss_domain_release(struct auth_domain *dom) 1934608a0ab2STrond Myklebust { 1935608a0ab2STrond Myklebust call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu); 1936608a0ab2STrond Myklebust } 1937608a0ab2STrond Myklebust 19381da177e4SLinus Torvalds static struct auth_ops svcauthops_gss = { 19391da177e4SLinus Torvalds .name = "rpcsec_gss", 19401da177e4SLinus Torvalds .owner = THIS_MODULE, 19411da177e4SLinus Torvalds .flavour = RPC_AUTH_GSS, 19421da177e4SLinus Torvalds .accept = svcauth_gss_accept, 19431da177e4SLinus Torvalds .release = svcauth_gss_release, 19441da177e4SLinus Torvalds .domain_release = svcauth_gss_domain_release, 19451da177e4SLinus Torvalds .set_client = svcauth_gss_set_client, 19461da177e4SLinus Torvalds }; 19471da177e4SLinus Torvalds 1948a1db410dSStanislav Kinsbursky static int rsi_cache_create_net(struct net *net) 1949a1db410dSStanislav Kinsbursky { 1950a1db410dSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1951a1db410dSStanislav Kinsbursky struct cache_detail *cd; 1952a1db410dSStanislav Kinsbursky int err; 1953a1db410dSStanislav Kinsbursky 1954a1db410dSStanislav Kinsbursky cd = cache_create_net(&rsi_cache_template, net); 1955a1db410dSStanislav Kinsbursky if (IS_ERR(cd)) 1956a1db410dSStanislav Kinsbursky return PTR_ERR(cd); 1957a1db410dSStanislav Kinsbursky err = cache_register_net(cd, net); 1958a1db410dSStanislav Kinsbursky if (err) { 1959a1db410dSStanislav Kinsbursky cache_destroy_net(cd, net); 1960a1db410dSStanislav Kinsbursky return err; 1961a1db410dSStanislav Kinsbursky } 1962a1db410dSStanislav Kinsbursky sn->rsi_cache = cd; 1963a1db410dSStanislav Kinsbursky return 0; 1964a1db410dSStanislav Kinsbursky } 1965a1db410dSStanislav Kinsbursky 1966a1db410dSStanislav Kinsbursky static void rsi_cache_destroy_net(struct net *net) 1967a1db410dSStanislav Kinsbursky { 1968a1db410dSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1969a1db410dSStanislav Kinsbursky struct cache_detail *cd = sn->rsi_cache; 1970a1db410dSStanislav Kinsbursky 1971a1db410dSStanislav Kinsbursky sn->rsi_cache = NULL; 1972a1db410dSStanislav Kinsbursky cache_purge(cd); 1973a1db410dSStanislav Kinsbursky cache_unregister_net(cd, net); 1974a1db410dSStanislav Kinsbursky cache_destroy_net(cd, net); 1975a1db410dSStanislav Kinsbursky } 1976a1db410dSStanislav Kinsbursky 1977a1db410dSStanislav Kinsbursky static int rsc_cache_create_net(struct net *net) 1978a1db410dSStanislav Kinsbursky { 1979a1db410dSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1980a1db410dSStanislav Kinsbursky struct cache_detail *cd; 1981a1db410dSStanislav Kinsbursky int err; 1982a1db410dSStanislav Kinsbursky 1983a1db410dSStanislav Kinsbursky cd = cache_create_net(&rsc_cache_template, net); 1984a1db410dSStanislav Kinsbursky if (IS_ERR(cd)) 1985a1db410dSStanislav Kinsbursky return PTR_ERR(cd); 1986a1db410dSStanislav Kinsbursky err = cache_register_net(cd, net); 1987a1db410dSStanislav Kinsbursky if (err) { 1988a1db410dSStanislav Kinsbursky cache_destroy_net(cd, net); 1989a1db410dSStanislav Kinsbursky return err; 1990a1db410dSStanislav Kinsbursky } 1991a1db410dSStanislav Kinsbursky sn->rsc_cache = cd; 1992a1db410dSStanislav Kinsbursky return 0; 1993a1db410dSStanislav Kinsbursky } 1994a1db410dSStanislav Kinsbursky 1995a1db410dSStanislav Kinsbursky static void rsc_cache_destroy_net(struct net *net) 1996a1db410dSStanislav Kinsbursky { 1997a1db410dSStanislav Kinsbursky struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1998a1db410dSStanislav Kinsbursky struct cache_detail *cd = sn->rsc_cache; 1999a1db410dSStanislav Kinsbursky 2000a1db410dSStanislav Kinsbursky sn->rsc_cache = NULL; 2001a1db410dSStanislav Kinsbursky cache_purge(cd); 2002a1db410dSStanislav Kinsbursky cache_unregister_net(cd, net); 2003a1db410dSStanislav Kinsbursky cache_destroy_net(cd, net); 2004a1db410dSStanislav Kinsbursky } 2005a1db410dSStanislav Kinsbursky 2006a1db410dSStanislav Kinsbursky int 2007a1db410dSStanislav Kinsbursky gss_svc_init_net(struct net *net) 2008a1db410dSStanislav Kinsbursky { 2009a1db410dSStanislav Kinsbursky int rv; 2010a1db410dSStanislav Kinsbursky 2011a1db410dSStanislav Kinsbursky rv = rsc_cache_create_net(net); 2012a1db410dSStanislav Kinsbursky if (rv) 2013a1db410dSStanislav Kinsbursky return rv; 2014a1db410dSStanislav Kinsbursky rv = rsi_cache_create_net(net); 2015a1db410dSStanislav Kinsbursky if (rv) 2016a1db410dSStanislav Kinsbursky goto out1; 2017030d794bSSimo Sorce rv = create_use_gss_proxy_proc_entry(net); 2018030d794bSSimo Sorce if (rv) 2019030d794bSSimo Sorce goto out2; 2020a1db410dSStanislav Kinsbursky return 0; 2021030d794bSSimo Sorce out2: 20225a475344SJ. Bruce Fields rsi_cache_destroy_net(net); 2023a1db410dSStanislav Kinsbursky out1: 2024a1db410dSStanislav Kinsbursky rsc_cache_destroy_net(net); 2025a1db410dSStanislav Kinsbursky return rv; 2026a1db410dSStanislav Kinsbursky } 2027a1db410dSStanislav Kinsbursky 2028a1db410dSStanislav Kinsbursky void 2029a1db410dSStanislav Kinsbursky gss_svc_shutdown_net(struct net *net) 2030a1db410dSStanislav Kinsbursky { 2031030d794bSSimo Sorce destroy_use_gss_proxy_proc_entry(net); 2032a1db410dSStanislav Kinsbursky rsi_cache_destroy_net(net); 2033a1db410dSStanislav Kinsbursky rsc_cache_destroy_net(net); 2034a1db410dSStanislav Kinsbursky } 2035a1db410dSStanislav Kinsbursky 20361da177e4SLinus Torvalds int 20371da177e4SLinus Torvalds gss_svc_init(void) 20381da177e4SLinus Torvalds { 2039a1db410dSStanislav Kinsbursky return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); 20401da177e4SLinus Torvalds } 20411da177e4SLinus Torvalds 20421da177e4SLinus Torvalds void 20431da177e4SLinus Torvalds gss_svc_shutdown(void) 20441da177e4SLinus Torvalds { 20451da177e4SLinus Torvalds svc_auth_unregister(RPC_AUTH_GSS); 20461da177e4SLinus Torvalds } 2047