1 #include <netinet/in.h> 2 #ifdef __sun__ 3 #include <inttypes.h> 4 #else 5 #include <stdint.h> 6 #endif 7 #include <ctype.h> 8 #include <errno.h> 9 #include <string.h> 10 #include <limits.h> 11 #include "modpost.h" 12 13 /* 14 * Stolen form Cryptographic API. 15 * 16 * MD4 Message Digest Algorithm (RFC1320). 17 * 18 * Implementation derived from Andrew Tridgell and Steve French's 19 * CIFS MD4 implementation, and the cryptoapi implementation 20 * originally based on the public domain implementation written 21 * by Colin Plumb in 1993. 22 * 23 * Copyright (c) Andrew Tridgell 1997-1998. 24 * Modified by Steve French (sfrench@us.ibm.com) 2002 25 * Copyright (c) Cryptoapi developers. 26 * Copyright (c) 2002 David S. Miller (davem@redhat.com) 27 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> 28 * 29 * This program is free software; you can redistribute it and/or modify 30 * it under the terms of the GNU General Public License as published by 31 * the Free Software Foundation; either version 2 of the License, or 32 * (at your option) any later version. 33 * 34 */ 35 #define MD4_DIGEST_SIZE 16 36 #define MD4_HMAC_BLOCK_SIZE 64 37 #define MD4_BLOCK_WORDS 16 38 #define MD4_HASH_WORDS 4 39 40 struct md4_ctx { 41 uint32_t hash[MD4_HASH_WORDS]; 42 uint32_t block[MD4_BLOCK_WORDS]; 43 uint64_t byte_count; 44 }; 45 46 static inline uint32_t lshift(uint32_t x, unsigned int s) 47 { 48 x &= 0xFFFFFFFF; 49 return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s)); 50 } 51 52 static inline uint32_t F(uint32_t x, uint32_t y, uint32_t z) 53 { 54 return (x & y) | ((~x) & z); 55 } 56 57 static inline uint32_t G(uint32_t x, uint32_t y, uint32_t z) 58 { 59 return (x & y) | (x & z) | (y & z); 60 } 61 62 static inline uint32_t H(uint32_t x, uint32_t y, uint32_t z) 63 { 64 return x ^ y ^ z; 65 } 66 67 #define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s)) 68 #define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (uint32_t)0x5A827999,s)) 69 #define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (uint32_t)0x6ED9EBA1,s)) 70 71 /* XXX: this stuff can be optimized */ 72 static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words) 73 { 74 while (words--) { 75 *buf = ntohl(*buf); 76 buf++; 77 } 78 } 79 80 static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words) 81 { 82 while (words--) { 83 *buf = htonl(*buf); 84 buf++; 85 } 86 } 87 88 static void md4_transform(uint32_t *hash, uint32_t const *in) 89 { 90 uint32_t a, b, c, d; 91 92 a = hash[0]; 93 b = hash[1]; 94 c = hash[2]; 95 d = hash[3]; 96 97 ROUND1(a, b, c, d, in[0], 3); 98 ROUND1(d, a, b, c, in[1], 7); 99 ROUND1(c, d, a, b, in[2], 11); 100 ROUND1(b, c, d, a, in[3], 19); 101 ROUND1(a, b, c, d, in[4], 3); 102 ROUND1(d, a, b, c, in[5], 7); 103 ROUND1(c, d, a, b, in[6], 11); 104 ROUND1(b, c, d, a, in[7], 19); 105 ROUND1(a, b, c, d, in[8], 3); 106 ROUND1(d, a, b, c, in[9], 7); 107 ROUND1(c, d, a, b, in[10], 11); 108 ROUND1(b, c, d, a, in[11], 19); 109 ROUND1(a, b, c, d, in[12], 3); 110 ROUND1(d, a, b, c, in[13], 7); 111 ROUND1(c, d, a, b, in[14], 11); 112 ROUND1(b, c, d, a, in[15], 19); 113 114 ROUND2(a, b, c, d,in[ 0], 3); 115 ROUND2(d, a, b, c, in[4], 5); 116 ROUND2(c, d, a, b, in[8], 9); 117 ROUND2(b, c, d, a, in[12], 13); 118 ROUND2(a, b, c, d, in[1], 3); 119 ROUND2(d, a, b, c, in[5], 5); 120 ROUND2(c, d, a, b, in[9], 9); 121 ROUND2(b, c, d, a, in[13], 13); 122 ROUND2(a, b, c, d, in[2], 3); 123 ROUND2(d, a, b, c, in[6], 5); 124 ROUND2(c, d, a, b, in[10], 9); 125 ROUND2(b, c, d, a, in[14], 13); 126 ROUND2(a, b, c, d, in[3], 3); 127 ROUND2(d, a, b, c, in[7], 5); 128 ROUND2(c, d, a, b, in[11], 9); 129 ROUND2(b, c, d, a, in[15], 13); 130 131 ROUND3(a, b, c, d,in[ 0], 3); 132 ROUND3(d, a, b, c, in[8], 9); 133 ROUND3(c, d, a, b, in[4], 11); 134 ROUND3(b, c, d, a, in[12], 15); 135 ROUND3(a, b, c, d, in[2], 3); 136 ROUND3(d, a, b, c, in[10], 9); 137 ROUND3(c, d, a, b, in[6], 11); 138 ROUND3(b, c, d, a, in[14], 15); 139 ROUND3(a, b, c, d, in[1], 3); 140 ROUND3(d, a, b, c, in[9], 9); 141 ROUND3(c, d, a, b, in[5], 11); 142 ROUND3(b, c, d, a, in[13], 15); 143 ROUND3(a, b, c, d, in[3], 3); 144 ROUND3(d, a, b, c, in[11], 9); 145 ROUND3(c, d, a, b, in[7], 11); 146 ROUND3(b, c, d, a, in[15], 15); 147 148 hash[0] += a; 149 hash[1] += b; 150 hash[2] += c; 151 hash[3] += d; 152 } 153 154 static inline void md4_transform_helper(struct md4_ctx *ctx) 155 { 156 le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(uint32_t)); 157 md4_transform(ctx->hash, ctx->block); 158 } 159 160 static void md4_init(struct md4_ctx *mctx) 161 { 162 mctx->hash[0] = 0x67452301; 163 mctx->hash[1] = 0xefcdab89; 164 mctx->hash[2] = 0x98badcfe; 165 mctx->hash[3] = 0x10325476; 166 mctx->byte_count = 0; 167 } 168 169 static void md4_update(struct md4_ctx *mctx, 170 const unsigned char *data, unsigned int len) 171 { 172 const uint32_t avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f); 173 174 mctx->byte_count += len; 175 176 if (avail > len) { 177 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), 178 data, len); 179 return; 180 } 181 182 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), 183 data, avail); 184 185 md4_transform_helper(mctx); 186 data += avail; 187 len -= avail; 188 189 while (len >= sizeof(mctx->block)) { 190 memcpy(mctx->block, data, sizeof(mctx->block)); 191 md4_transform_helper(mctx); 192 data += sizeof(mctx->block); 193 len -= sizeof(mctx->block); 194 } 195 196 memcpy(mctx->block, data, len); 197 } 198 199 static void md4_final_ascii(struct md4_ctx *mctx, char *out, unsigned int len) 200 { 201 const unsigned int offset = mctx->byte_count & 0x3f; 202 char *p = (char *)mctx->block + offset; 203 int padding = 56 - (offset + 1); 204 205 *p++ = 0x80; 206 if (padding < 0) { 207 memset(p, 0x00, padding + sizeof (uint64_t)); 208 md4_transform_helper(mctx); 209 p = (char *)mctx->block; 210 padding = 56; 211 } 212 213 memset(p, 0, padding); 214 mctx->block[14] = mctx->byte_count << 3; 215 mctx->block[15] = mctx->byte_count >> 29; 216 le32_to_cpu_array(mctx->block, (sizeof(mctx->block) - 217 sizeof(uint64_t)) / sizeof(uint32_t)); 218 md4_transform(mctx->hash, mctx->block); 219 cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(uint32_t)); 220 221 snprintf(out, len, "%08X%08X%08X%08X", 222 mctx->hash[0], mctx->hash[1], mctx->hash[2], mctx->hash[3]); 223 } 224 225 static inline void add_char(unsigned char c, struct md4_ctx *md) 226 { 227 md4_update(md, &c, 1); 228 } 229 230 static int parse_string(const char *file, unsigned long len, 231 struct md4_ctx *md) 232 { 233 unsigned long i; 234 235 add_char(file[0], md); 236 for (i = 1; i < len; i++) { 237 add_char(file[i], md); 238 if (file[i] == '"' && file[i-1] != '\\') 239 break; 240 } 241 return i; 242 } 243 244 static int parse_comment(const char *file, unsigned long len) 245 { 246 unsigned long i; 247 248 for (i = 2; i < len; i++) { 249 if (file[i-1] == '*' && file[i] == '/') 250 break; 251 } 252 return i; 253 } 254 255 /* FIXME: Handle .s files differently (eg. # starts comments) --RR */ 256 static int parse_file(const char *fname, struct md4_ctx *md) 257 { 258 char *file; 259 unsigned long i, len; 260 261 file = read_text_file(fname); 262 len = strlen(file); 263 264 for (i = 0; i < len; i++) { 265 /* Collapse and ignore \ and CR. */ 266 if (file[i] == '\\' && (i+1 < len) && file[i+1] == '\n') { 267 i++; 268 continue; 269 } 270 271 /* Ignore whitespace */ 272 if (isspace(file[i])) 273 continue; 274 275 /* Handle strings as whole units */ 276 if (file[i] == '"') { 277 i += parse_string(file+i, len - i, md); 278 continue; 279 } 280 281 /* Comments: ignore */ 282 if (file[i] == '/' && file[i+1] == '*') { 283 i += parse_comment(file+i, len - i); 284 continue; 285 } 286 287 add_char(file[i], md); 288 } 289 free(file); 290 return 1; 291 } 292 /* Check whether the file is a static library or not */ 293 static bool is_static_library(const char *objfile) 294 { 295 int len = strlen(objfile); 296 297 return objfile[len - 2] == '.' && objfile[len - 1] == 'a'; 298 } 299 300 /* We have dir/file.o. Open dir/.file.o.cmd, look for source_ and deps_ line 301 * to figure out source files. */ 302 static int parse_source_files(const char *objfile, struct md4_ctx *md) 303 { 304 char *cmd, *file, *line, *dir, *pos; 305 const char *base; 306 int dirlen, ret = 0, check_files = 0; 307 308 cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd"))); 309 310 base = strrchr(objfile, '/'); 311 if (base) { 312 base++; 313 dirlen = base - objfile; 314 sprintf(cmd, "%.*s.%s.cmd", dirlen, objfile, base); 315 } else { 316 dirlen = 0; 317 sprintf(cmd, ".%s.cmd", objfile); 318 } 319 dir = NOFAIL(malloc(dirlen + 1)); 320 strncpy(dir, objfile, dirlen); 321 dir[dirlen] = '\0'; 322 323 file = read_text_file(cmd); 324 325 pos = file; 326 327 /* Sum all files in the same dir or subdirs. */ 328 while ((line = get_line(&pos))) { 329 char* p = line; 330 331 if (strncmp(line, "source_", sizeof("source_")-1) == 0) { 332 p = strrchr(line, ' '); 333 if (!p) { 334 warn("malformed line: %s\n", line); 335 goto out_file; 336 } 337 p++; 338 if (!parse_file(p, md)) { 339 warn("could not open %s: %s\n", 340 p, strerror(errno)); 341 goto out_file; 342 } 343 continue; 344 } 345 if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) { 346 check_files = 1; 347 continue; 348 } 349 if (!check_files) 350 continue; 351 352 /* Continue until line does not end with '\' */ 353 if ( *(p + strlen(p)-1) != '\\') 354 break; 355 /* Terminate line at first space, to get rid of final ' \' */ 356 while (*p) { 357 if (isspace(*p)) { 358 *p = '\0'; 359 break; 360 } 361 p++; 362 } 363 364 /* Check if this file is in same dir as objfile */ 365 if ((strstr(line, dir)+strlen(dir)-1) == strrchr(line, '/')) { 366 if (!parse_file(line, md)) { 367 warn("could not open %s: %s\n", 368 line, strerror(errno)); 369 goto out_file; 370 } 371 372 } 373 374 } 375 376 /* Everyone parsed OK */ 377 ret = 1; 378 out_file: 379 free(file); 380 free(dir); 381 free(cmd); 382 return ret; 383 } 384 385 /* Calc and record src checksum. */ 386 void get_src_version(const char *modname, char sum[], unsigned sumlen) 387 { 388 char *buf; 389 struct md4_ctx md; 390 char *fname; 391 char filelist[PATH_MAX + 1]; 392 393 /* objects for a module are listed in the first line of *.mod file. */ 394 snprintf(filelist, sizeof(filelist), "%s.mod", modname); 395 396 buf = read_text_file(filelist); 397 398 md4_init(&md); 399 while ((fname = strsep(&buf, "\n"))) { 400 if (!*fname) 401 continue; 402 if (!(is_static_library(fname)) && 403 !parse_source_files(fname, &md)) 404 goto free; 405 } 406 407 md4_final_ascii(&md, sum, sumlen); 408 free: 409 free(buf); 410 } 411