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 "modpost.h" 11 12 /* 13 * Stolen form Cryptographic API. 14 * 15 * MD4 Message Digest Algorithm (RFC1320). 16 * 17 * Implementation derived from Andrew Tridgell and Steve French's 18 * CIFS MD4 implementation, and the cryptoapi implementation 19 * originally based on the public domain implementation written 20 * by Colin Plumb in 1993. 21 * 22 * Copyright (c) Andrew Tridgell 1997-1998. 23 * Modified by Steve French (sfrench@us.ibm.com) 2002 24 * Copyright (c) Cryptoapi developers. 25 * Copyright (c) 2002 David S. Miller (davem@redhat.com) 26 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> 27 * 28 * This program is free software; you can redistribute it and/or modify 29 * it under the terms of the GNU General Public License as published by 30 * the Free Software Foundation; either version 2 of the License, or 31 * (at your option) any later version. 32 * 33 */ 34 #define MD4_DIGEST_SIZE 16 35 #define MD4_HMAC_BLOCK_SIZE 64 36 #define MD4_BLOCK_WORDS 16 37 #define MD4_HASH_WORDS 4 38 39 struct md4_ctx { 40 uint32_t hash[MD4_HASH_WORDS]; 41 uint32_t block[MD4_BLOCK_WORDS]; 42 uint64_t byte_count; 43 }; 44 45 static inline uint32_t lshift(uint32_t x, unsigned int s) 46 { 47 x &= 0xFFFFFFFF; 48 return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s)); 49 } 50 51 static inline uint32_t F(uint32_t x, uint32_t y, uint32_t z) 52 { 53 return (x & y) | ((~x) & z); 54 } 55 56 static inline uint32_t G(uint32_t x, uint32_t y, uint32_t z) 57 { 58 return (x & y) | (x & z) | (y & z); 59 } 60 61 static inline uint32_t H(uint32_t x, uint32_t y, uint32_t z) 62 { 63 return x ^ y ^ z; 64 } 65 66 #define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s)) 67 #define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (uint32_t)0x5A827999,s)) 68 #define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (uint32_t)0x6ED9EBA1,s)) 69 70 /* XXX: this stuff can be optimized */ 71 static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words) 72 { 73 while (words--) { 74 *buf = ntohl(*buf); 75 buf++; 76 } 77 } 78 79 static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words) 80 { 81 while (words--) { 82 *buf = htonl(*buf); 83 buf++; 84 } 85 } 86 87 static void md4_transform(uint32_t *hash, uint32_t const *in) 88 { 89 uint32_t a, b, c, d; 90 91 a = hash[0]; 92 b = hash[1]; 93 c = hash[2]; 94 d = hash[3]; 95 96 ROUND1(a, b, c, d, in[0], 3); 97 ROUND1(d, a, b, c, in[1], 7); 98 ROUND1(c, d, a, b, in[2], 11); 99 ROUND1(b, c, d, a, in[3], 19); 100 ROUND1(a, b, c, d, in[4], 3); 101 ROUND1(d, a, b, c, in[5], 7); 102 ROUND1(c, d, a, b, in[6], 11); 103 ROUND1(b, c, d, a, in[7], 19); 104 ROUND1(a, b, c, d, in[8], 3); 105 ROUND1(d, a, b, c, in[9], 7); 106 ROUND1(c, d, a, b, in[10], 11); 107 ROUND1(b, c, d, a, in[11], 19); 108 ROUND1(a, b, c, d, in[12], 3); 109 ROUND1(d, a, b, c, in[13], 7); 110 ROUND1(c, d, a, b, in[14], 11); 111 ROUND1(b, c, d, a, in[15], 19); 112 113 ROUND2(a, b, c, d,in[ 0], 3); 114 ROUND2(d, a, b, c, in[4], 5); 115 ROUND2(c, d, a, b, in[8], 9); 116 ROUND2(b, c, d, a, in[12], 13); 117 ROUND2(a, b, c, d, in[1], 3); 118 ROUND2(d, a, b, c, in[5], 5); 119 ROUND2(c, d, a, b, in[9], 9); 120 ROUND2(b, c, d, a, in[13], 13); 121 ROUND2(a, b, c, d, in[2], 3); 122 ROUND2(d, a, b, c, in[6], 5); 123 ROUND2(c, d, a, b, in[10], 9); 124 ROUND2(b, c, d, a, in[14], 13); 125 ROUND2(a, b, c, d, in[3], 3); 126 ROUND2(d, a, b, c, in[7], 5); 127 ROUND2(c, d, a, b, in[11], 9); 128 ROUND2(b, c, d, a, in[15], 13); 129 130 ROUND3(a, b, c, d,in[ 0], 3); 131 ROUND3(d, a, b, c, in[8], 9); 132 ROUND3(c, d, a, b, in[4], 11); 133 ROUND3(b, c, d, a, in[12], 15); 134 ROUND3(a, b, c, d, in[2], 3); 135 ROUND3(d, a, b, c, in[10], 9); 136 ROUND3(c, d, a, b, in[6], 11); 137 ROUND3(b, c, d, a, in[14], 15); 138 ROUND3(a, b, c, d, in[1], 3); 139 ROUND3(d, a, b, c, in[9], 9); 140 ROUND3(c, d, a, b, in[5], 11); 141 ROUND3(b, c, d, a, in[13], 15); 142 ROUND3(a, b, c, d, in[3], 3); 143 ROUND3(d, a, b, c, in[11], 9); 144 ROUND3(c, d, a, b, in[7], 11); 145 ROUND3(b, c, d, a, in[15], 15); 146 147 hash[0] += a; 148 hash[1] += b; 149 hash[2] += c; 150 hash[3] += d; 151 } 152 153 static inline void md4_transform_helper(struct md4_ctx *ctx) 154 { 155 le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(uint32_t)); 156 md4_transform(ctx->hash, ctx->block); 157 } 158 159 static void md4_init(struct md4_ctx *mctx) 160 { 161 mctx->hash[0] = 0x67452301; 162 mctx->hash[1] = 0xefcdab89; 163 mctx->hash[2] = 0x98badcfe; 164 mctx->hash[3] = 0x10325476; 165 mctx->byte_count = 0; 166 } 167 168 static void md4_update(struct md4_ctx *mctx, 169 const unsigned char *data, unsigned int len) 170 { 171 const uint32_t avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f); 172 173 mctx->byte_count += len; 174 175 if (avail > len) { 176 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), 177 data, len); 178 return; 179 } 180 181 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), 182 data, avail); 183 184 md4_transform_helper(mctx); 185 data += avail; 186 len -= avail; 187 188 while (len >= sizeof(mctx->block)) { 189 memcpy(mctx->block, data, sizeof(mctx->block)); 190 md4_transform_helper(mctx); 191 data += sizeof(mctx->block); 192 len -= sizeof(mctx->block); 193 } 194 195 memcpy(mctx->block, data, len); 196 } 197 198 static void md4_final_ascii(struct md4_ctx *mctx, char *out, unsigned int len) 199 { 200 const unsigned int offset = mctx->byte_count & 0x3f; 201 char *p = (char *)mctx->block + offset; 202 int padding = 56 - (offset + 1); 203 204 *p++ = 0x80; 205 if (padding < 0) { 206 memset(p, 0x00, padding + sizeof (uint64_t)); 207 md4_transform_helper(mctx); 208 p = (char *)mctx->block; 209 padding = 56; 210 } 211 212 memset(p, 0, padding); 213 mctx->block[14] = mctx->byte_count << 3; 214 mctx->block[15] = mctx->byte_count >> 29; 215 le32_to_cpu_array(mctx->block, (sizeof(mctx->block) - 216 sizeof(uint64_t)) / sizeof(uint32_t)); 217 md4_transform(mctx->hash, mctx->block); 218 cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(uint32_t)); 219 220 snprintf(out, len, "%08X%08X%08X%08X", 221 mctx->hash[0], mctx->hash[1], mctx->hash[2], mctx->hash[3]); 222 } 223 224 static inline void add_char(unsigned char c, struct md4_ctx *md) 225 { 226 md4_update(md, &c, 1); 227 } 228 229 static int parse_string(const char *file, unsigned long len, 230 struct md4_ctx *md) 231 { 232 unsigned long i; 233 234 add_char(file[0], md); 235 for (i = 1; i < len; i++) { 236 add_char(file[i], md); 237 if (file[i] == '"' && file[i-1] != '\\') 238 break; 239 } 240 return i; 241 } 242 243 static int parse_comment(const char *file, unsigned long len) 244 { 245 unsigned long i; 246 247 for (i = 2; i < len; i++) { 248 if (file[i-1] == '*' && file[i] == '/') 249 break; 250 } 251 return i; 252 } 253 254 /* FIXME: Handle .s files differently (eg. # starts comments) --RR */ 255 static int parse_file(const char *fname, struct md4_ctx *md) 256 { 257 char *file; 258 unsigned long i, len; 259 260 file = grab_file(fname, &len); 261 if (!file) 262 return 0; 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 release_file(file, len); 290 return 1; 291 } 292 293 /* We have dir/file.o. Open dir/.file.o.cmd, look for deps_ line to 294 * figure out source file. */ 295 static int parse_source_files(const char *objfile, struct md4_ctx *md) 296 { 297 char *cmd, *file, *line, *dir; 298 const char *base; 299 unsigned long flen, pos = 0; 300 int dirlen, ret = 0, check_files = 0; 301 302 cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd"))); 303 304 base = strrchr(objfile, '/'); 305 if (base) { 306 base++; 307 dirlen = base - objfile; 308 sprintf(cmd, "%.*s.%s.cmd", dirlen, objfile, base); 309 } else { 310 dirlen = 0; 311 sprintf(cmd, ".%s.cmd", objfile); 312 } 313 dir = NOFAIL(malloc(dirlen + 1)); 314 strncpy(dir, objfile, dirlen); 315 dir[dirlen] = '\0'; 316 317 file = grab_file(cmd, &flen); 318 if (!file) { 319 fprintf(stderr, "Warning: could not find %s for %s\n", 320 cmd, objfile); 321 goto out; 322 } 323 324 /* There will be a line like so: 325 deps_drivers/net/dummy.o := \ 326 drivers/net/dummy.c \ 327 $(wildcard include/config/net/fastroute.h) \ 328 include/linux/config.h \ 329 $(wildcard include/config/h.h) \ 330 include/linux/module.h \ 331 332 Sum all files in the same dir or subdirs. 333 */ 334 while ((line = get_next_line(&pos, file, flen)) != NULL) { 335 char* p = line; 336 if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) { 337 check_files = 1; 338 continue; 339 } 340 if (!check_files) 341 continue; 342 343 /* Continue until line does not end with '\' */ 344 if ( *(p + strlen(p)-1) != '\\') 345 break; 346 /* Terminate line at first space, to get rid of final ' \' */ 347 while (*p) { 348 if (isspace(*p)) { 349 *p = '\0'; 350 break; 351 } 352 p++; 353 } 354 355 /* Check if this file is in same dir as objfile */ 356 if ((strstr(line, dir)+strlen(dir)-1) == strrchr(line, '/')) { 357 if (!parse_file(line, md)) { 358 fprintf(stderr, 359 "Warning: could not open %s: %s\n", 360 line, strerror(errno)); 361 goto out_file; 362 } 363 364 } 365 366 } 367 368 /* Everyone parsed OK */ 369 ret = 1; 370 out_file: 371 release_file(file, flen); 372 out: 373 free(dir); 374 free(cmd); 375 return ret; 376 } 377 378 /* Calc and record src checksum. */ 379 void get_src_version(const char *modname, char sum[], unsigned sumlen) 380 { 381 void *file; 382 unsigned long len; 383 struct md4_ctx md; 384 char *sources, *end, *fname; 385 const char *basename; 386 char filelist[strlen(getenv("MODVERDIR")) + strlen("/") + 387 strlen(modname) - strlen(".o") + strlen(".mod") + 1 ]; 388 389 /* Source files for module are in .tmp_versions/modname.mod, 390 after the first line. */ 391 if (strrchr(modname, '/')) 392 basename = strrchr(modname, '/') + 1; 393 else 394 basename = modname; 395 sprintf(filelist, "%s/%.*s.mod", getenv("MODVERDIR"), 396 (int) strlen(basename) - 2, basename); 397 398 file = grab_file(filelist, &len); 399 if (!file) { 400 fprintf(stderr, "Warning: could not find versions for %s\n", 401 filelist); 402 return; 403 } 404 405 sources = strchr(file, '\n'); 406 if (!sources) { 407 fprintf(stderr, "Warning: malformed versions file for %s\n", 408 modname); 409 goto release; 410 } 411 412 sources++; 413 end = strchr(sources, '\n'); 414 if (!end) { 415 fprintf(stderr, "Warning: bad ending versions file for %s\n", 416 modname); 417 goto release; 418 } 419 *end = '\0'; 420 421 md4_init(&md); 422 while ((fname = strsep(&sources, " ")) != NULL) { 423 if (!*fname) 424 continue; 425 if (!parse_source_files(fname, &md)) 426 goto release; 427 } 428 429 md4_final_ascii(&md, sum, sumlen); 430 release: 431 release_file(file, len); 432 } 433 434 static void write_version(const char *filename, const char *sum, 435 unsigned long offset) 436 { 437 int fd; 438 439 fd = open(filename, O_RDWR); 440 if (fd < 0) { 441 fprintf(stderr, "Warning: changing sum in %s failed: %s\n", 442 filename, strerror(errno)); 443 return; 444 } 445 446 if (lseek(fd, offset, SEEK_SET) == (off_t)-1) { 447 fprintf(stderr, "Warning: changing sum in %s:%lu failed: %s\n", 448 filename, offset, strerror(errno)); 449 goto out; 450 } 451 452 if (write(fd, sum, strlen(sum)+1) != strlen(sum)+1) { 453 fprintf(stderr, "Warning: writing sum in %s failed: %s\n", 454 filename, strerror(errno)); 455 goto out; 456 } 457 out: 458 close(fd); 459 } 460 461 static int strip_rcs_crap(char *version) 462 { 463 unsigned int len, full_len; 464 465 if (strncmp(version, "$Revision", strlen("$Revision")) != 0) 466 return 0; 467 468 /* Space for version string follows. */ 469 full_len = strlen(version) + strlen(version + strlen(version) + 1) + 2; 470 471 /* Move string to start with version number: prefix will be 472 * $Revision$ or $Revision: */ 473 len = strlen("$Revision"); 474 if (version[len] == ':' || version[len] == '$') 475 len++; 476 while (isspace(version[len])) 477 len++; 478 memmove(version, version+len, full_len-len); 479 full_len -= len; 480 481 /* Preserve up to next whitespace. */ 482 len = 0; 483 while (version[len] && !isspace(version[len])) 484 len++; 485 memmove(version + len, version + strlen(version), 486 full_len - strlen(version)); 487 return 1; 488 } 489 490 /* Clean up RCS-style version numbers. */ 491 void maybe_frob_rcs_version(const char *modfilename, 492 char *version, 493 void *modinfo, 494 unsigned long version_offset) 495 { 496 if (strip_rcs_crap(version)) 497 write_version(modfilename, version, version_offset); 498 } 499