1 /* 2 * linux/net/sunrpc/gss_krb5_crypto.c 3 * 4 * Copyright (c) 2000 The Regents of the University of Michigan. 5 * All rights reserved. 6 * 7 * Andy Adamson <andros@umich.edu> 8 * Bruce Fields <bfields@umich.edu> 9 */ 10 11 /* 12 * Copyright (C) 1998 by the FundsXpress, INC. 13 * 14 * All rights reserved. 15 * 16 * Export of this software from the United States of America may require 17 * a specific license from the United States Government. It is the 18 * responsibility of any person or organization contemplating export to 19 * obtain such a license before exporting. 20 * 21 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 22 * distribute this software and its documentation for any purpose and 23 * without fee is hereby granted, provided that the above copyright 24 * notice appear in all copies and that both that copyright notice and 25 * this permission notice appear in supporting documentation, and that 26 * the name of FundsXpress. not be used in advertising or publicity pertaining 27 * to distribution of the software without specific, written prior 28 * permission. FundsXpress makes no representations about the suitability of 29 * this software for any purpose. It is provided "as is" without express 30 * or implied warranty. 31 * 32 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 33 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 34 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 35 */ 36 37 #include <linux/types.h> 38 #include <linux/mm.h> 39 #include <linux/slab.h> 40 #include <asm/scatterlist.h> 41 #include <linux/crypto.h> 42 #include <linux/highmem.h> 43 #include <linux/pagemap.h> 44 #include <linux/sunrpc/gss_krb5.h> 45 46 #ifdef RPC_DEBUG 47 # define RPCDBG_FACILITY RPCDBG_AUTH 48 #endif 49 50 u32 51 krb5_encrypt( 52 struct crypto_tfm *tfm, 53 void * iv, 54 void * in, 55 void * out, 56 int length) 57 { 58 u32 ret = -EINVAL; 59 struct scatterlist sg[1]; 60 u8 local_iv[16] = {0}; 61 62 dprintk("RPC: krb5_encrypt: input data:\n"); 63 print_hexl((u32 *)in, length, 0); 64 65 if (length % crypto_tfm_alg_blocksize(tfm) != 0) 66 goto out; 67 68 if (crypto_tfm_alg_ivsize(tfm) > 16) { 69 dprintk("RPC: gss_k5encrypt: tfm iv size to large %d\n", 70 crypto_tfm_alg_ivsize(tfm)); 71 goto out; 72 } 73 74 if (iv) 75 memcpy(local_iv, iv, crypto_tfm_alg_ivsize(tfm)); 76 77 memcpy(out, in, length); 78 sg[0].page = virt_to_page(out); 79 sg[0].offset = offset_in_page(out); 80 sg[0].length = length; 81 82 ret = crypto_cipher_encrypt_iv(tfm, sg, sg, length, local_iv); 83 84 dprintk("RPC: krb5_encrypt: output data:\n"); 85 print_hexl((u32 *)out, length, 0); 86 out: 87 dprintk("RPC: krb5_encrypt returns %d\n",ret); 88 return(ret); 89 } 90 91 EXPORT_SYMBOL(krb5_encrypt); 92 93 u32 94 krb5_decrypt( 95 struct crypto_tfm *tfm, 96 void * iv, 97 void * in, 98 void * out, 99 int length) 100 { 101 u32 ret = -EINVAL; 102 struct scatterlist sg[1]; 103 u8 local_iv[16] = {0}; 104 105 dprintk("RPC: krb5_decrypt: input data:\n"); 106 print_hexl((u32 *)in, length, 0); 107 108 if (length % crypto_tfm_alg_blocksize(tfm) != 0) 109 goto out; 110 111 if (crypto_tfm_alg_ivsize(tfm) > 16) { 112 dprintk("RPC: gss_k5decrypt: tfm iv size to large %d\n", 113 crypto_tfm_alg_ivsize(tfm)); 114 goto out; 115 } 116 if (iv) 117 memcpy(local_iv,iv, crypto_tfm_alg_ivsize(tfm)); 118 119 memcpy(out, in, length); 120 sg[0].page = virt_to_page(out); 121 sg[0].offset = offset_in_page(out); 122 sg[0].length = length; 123 124 ret = crypto_cipher_decrypt_iv(tfm, sg, sg, length, local_iv); 125 126 dprintk("RPC: krb5_decrypt: output_data:\n"); 127 print_hexl((u32 *)out, length, 0); 128 out: 129 dprintk("RPC: gss_k5decrypt returns %d\n",ret); 130 return(ret); 131 } 132 133 EXPORT_SYMBOL(krb5_decrypt); 134 135 static void 136 buf_to_sg(struct scatterlist *sg, char *ptr, int len) { 137 sg->page = virt_to_page(ptr); 138 sg->offset = offset_in_page(ptr); 139 sg->length = len; 140 } 141 142 /* checksum the plaintext data and hdrlen bytes of the token header */ 143 s32 144 make_checksum(s32 cksumtype, char *header, int hdrlen, struct xdr_buf *body, 145 struct xdr_netobj *cksum) 146 { 147 char *cksumname; 148 struct crypto_tfm *tfm = NULL; /* XXX add to ctx? */ 149 struct scatterlist sg[1]; 150 u32 code = GSS_S_FAILURE; 151 int len, thislen, offset; 152 int i; 153 154 switch (cksumtype) { 155 case CKSUMTYPE_RSA_MD5: 156 cksumname = "md5"; 157 break; 158 default: 159 dprintk("RPC: krb5_make_checksum:" 160 " unsupported checksum %d", cksumtype); 161 goto out; 162 } 163 if (!(tfm = crypto_alloc_tfm(cksumname, 0))) 164 goto out; 165 cksum->len = crypto_tfm_alg_digestsize(tfm); 166 if ((cksum->data = kmalloc(cksum->len, GFP_KERNEL)) == NULL) 167 goto out; 168 169 crypto_digest_init(tfm); 170 buf_to_sg(sg, header, hdrlen); 171 crypto_digest_update(tfm, sg, 1); 172 if (body->head[0].iov_len) { 173 buf_to_sg(sg, body->head[0].iov_base, body->head[0].iov_len); 174 crypto_digest_update(tfm, sg, 1); 175 } 176 177 len = body->page_len; 178 if (len != 0) { 179 offset = body->page_base & (PAGE_CACHE_SIZE - 1); 180 i = body->page_base >> PAGE_CACHE_SHIFT; 181 thislen = PAGE_CACHE_SIZE - offset; 182 do { 183 if (thislen > len) 184 thislen = len; 185 sg->page = body->pages[i]; 186 sg->offset = offset; 187 sg->length = thislen; 188 kmap(sg->page); /* XXX kmap_atomic? */ 189 crypto_digest_update(tfm, sg, 1); 190 kunmap(sg->page); 191 len -= thislen; 192 i++; 193 offset = 0; 194 thislen = PAGE_CACHE_SIZE; 195 } while(len != 0); 196 } 197 if (body->tail[0].iov_len) { 198 buf_to_sg(sg, body->tail[0].iov_base, body->tail[0].iov_len); 199 crypto_digest_update(tfm, sg, 1); 200 } 201 crypto_digest_final(tfm, cksum->data); 202 code = 0; 203 out: 204 if (tfm) 205 crypto_free_tfm(tfm); 206 return code; 207 } 208 209 EXPORT_SYMBOL(make_checksum); 210