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 40struct md4_ctx { 41 uint32_t hash[MD4_HASH_WORDS]; 42 uint32_t block[MD4_BLOCK_WORDS]; 43 uint64_t byte_count; 44}; 45 46static inline uint32_t lshift(uint32_t x, unsigned int s) 47{ 48 x &= 0xFFFFFFFF; 49 return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s)); 50} 51 52static inline uint32_t F(uint32_t x, uint32_t y, uint32_t z) 53{ 54 return (x & y) | ((~x) & z); 55} 56 57static inline uint32_t G(uint32_t x, uint32_t y, uint32_t z) 58{ 59 return (x & y) | (x & z) | (y & z); 60} 61 62static 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 71static 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 79static 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 87static 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 153static 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 159static 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 168static 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 198static 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 224static inline void add_char(unsigned char c, struct md4_ctx *md) 225{ 226 md4_update(md, &c, 1); 227} 228 229static 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 243static 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 254static int parse_file(const char *fname, struct md4_ctx *md) 255{ 256 char *file; 257 unsigned long i, len; 258 259 file = grab_file(fname, &len); 260 if (!file) 261 return 0; 262 263 for (i = 0; i < len; i++) { 264 /* Collapse and ignore \ and CR. */ 265 if (file[i] == '\\' && (i+1 < len) && file[i+1] == '\n') { 266 i++; 267 continue; 268 } 269 270 /* Ignore whitespace */ 271 if (isspace(file[i])) 272 continue; 273 274 /* Handle strings as whole units */ 275 if (file[i] == '"') { 276 i += parse_string(file+i, len - i, md); 277 continue; 278 } 279 280 /* Comments: ignore */ 281 if (file[i] == '/' && file[i+1] == '*') { 282 i += parse_comment(file+i, len - i); 283 continue; 284 } 285 286 add_char(file[i], md); 287 } 288 release_file(file, len); 289 return 1; 290} 291/* Check whether the file is a static library or not */ 292static int is_static_library(const char *objfile) 293{ 294 int len = strlen(objfile); 295 if (objfile[len - 2] == '.' && objfile[len - 1] == 'a') 296 return 1; 297 else 298 return 0; 299} 300 301/* We have dir/file.o. Open dir/.file.o.cmd, look for deps_ line to 302 * figure out source file. */ 303static int parse_source_files(const char *objfile, struct md4_ctx *md) 304{ 305 char *cmd, *file, *line, *dir; 306 const char *base; 307 unsigned long flen, pos = 0; 308 int dirlen, ret = 0, check_files = 0; 309 310 cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd"))); 311 312 base = strrchr(objfile, '/'); 313 if (base) { 314 base++; 315 dirlen = base - objfile; 316 sprintf(cmd, "%.*s.%s.cmd", dirlen, objfile, base); 317 } else { 318 dirlen = 0; 319 sprintf(cmd, ".%s.cmd", objfile); 320 } 321 dir = NOFAIL(malloc(dirlen + 1)); 322 strncpy(dir, objfile, dirlen); 323 dir[dirlen] = '\0'; 324 325 file = grab_file(cmd, &flen); 326 if (!file) { 327 warn("could not find %s for %s\n", cmd, objfile); 328 goto out; 329 } 330 331 /* There will be a line like so: 332 deps_drivers/net/dummy.o := \ 333 drivers/net/dummy.c \ 334 $(wildcard include/config/net/fastroute.h) \ 335 include/linux/module.h \ 336 337 Sum all files in the same dir or subdirs. 338 */ 339 while ((line = get_next_line(&pos, file, flen)) != NULL) { 340 char* p = line; 341 if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) { 342 check_files = 1; 343 continue; 344 } 345 if (!check_files) 346 continue; 347 348 /* Continue until line does not end with '\' */ 349 if ( *(p + strlen(p)-1) != '\\') 350 break; 351 /* Terminate line at first space, to get rid of final ' \' */ 352 while (*p) { 353 if (isspace(*p)) { 354 *p = '\0'; 355 break; 356 } 357 p++; 358 } 359 360 /* Check if this file is in same dir as objfile */ 361 if ((strstr(line, dir)+strlen(dir)-1) == strrchr(line, '/')) { 362 if (!parse_file(line, md)) { 363 warn("could not open %s: %s\n", 364 line, strerror(errno)); 365 goto out_file; 366 } 367 368 } 369 370 } 371 372 /* Everyone parsed OK */ 373 ret = 1; 374out_file: 375 release_file(file, flen); 376out: 377 free(dir); 378 free(cmd); 379 return ret; 380} 381 382/* Calc and record src checksum. */ 383void get_src_version(const char *modname, char sum[], unsigned sumlen) 384{ 385 void *file; 386 unsigned long len; 387 struct md4_ctx md; 388 char *sources, *end, *fname; 389 const char *basename; 390 char filelist[PATH_MAX + 1]; 391 char *modverdir = getenv("MODVERDIR"); 392 393 if (!modverdir) 394 modverdir = "."; 395 396 /* Source files for module are in .tmp_versions/modname.mod, 397 after the first line. */ 398 if (strrchr(modname, '/')) 399 basename = strrchr(modname, '/') + 1; 400 else 401 basename = modname; 402 sprintf(filelist, "%s/%.*s.mod", modverdir, 403 (int) strlen(basename) - 2, basename); 404 405 file = grab_file(filelist, &len); 406 if (!file) 407 /* not a module or .mod file missing - ignore */ 408 return; 409 410 sources = strchr(file, '\n'); 411 if (!sources) { 412 warn("malformed versions file for %s\n", modname); 413 goto release; 414 } 415 416 sources++; 417 end = strchr(sources, '\n'); 418 if (!end) { 419 warn("bad ending versions file for %s\n", modname); 420 goto release; 421 } 422 *end = '\0'; 423 424 md4_init(&md); 425 while ((fname = strsep(&sources, " ")) != NULL) { 426 if (!*fname) 427 continue; 428 if (!(is_static_library(fname)) && 429 !parse_source_files(fname, &md)) 430 goto release; 431 } 432 433 md4_final_ascii(&md, sum, sumlen); 434release: 435 release_file(file, len); 436} 437 438static void write_version(const char *filename, const char *sum, 439 unsigned long offset) 440{ 441 int fd; 442 443 fd = open(filename, O_RDWR); 444 if (fd < 0) { 445 warn("changing sum in %s failed: %s\n", 446 filename, strerror(errno)); 447 return; 448 } 449 450 if (lseek(fd, offset, SEEK_SET) == (off_t)-1) { 451 warn("changing sum in %s:%lu failed: %s\n", 452 filename, offset, strerror(errno)); 453 goto out; 454 } 455 456 if (write(fd, sum, strlen(sum)+1) != strlen(sum)+1) { 457 warn("writing sum in %s failed: %s\n", 458 filename, strerror(errno)); 459 goto out; 460 } 461out: 462 close(fd); 463} 464 465static int strip_rcs_crap(char *version) 466{ 467 unsigned int len, full_len; 468 469 if (strncmp(version, "$Revision", strlen("$Revision")) != 0) 470 return 0; 471 472 /* Space for version string follows. */ 473 full_len = strlen(version) + strlen(version + strlen(version) + 1) + 2; 474 475 /* Move string to start with version number: prefix will be 476 * $Revision$ or $Revision: */ 477 len = strlen("$Revision"); 478 if (version[len] == ':' || version[len] == '$') 479 len++; 480 while (isspace(version[len])) 481 len++; 482 memmove(version, version+len, full_len-len); 483 full_len -= len; 484 485 /* Preserve up to next whitespace. */ 486 len = 0; 487 while (version[len] && !isspace(version[len])) 488 len++; 489 memmove(version + len, version + strlen(version), 490 full_len - strlen(version)); 491 return 1; 492} 493 494/* Clean up RCS-style version numbers. */ 495void maybe_frob_rcs_version(const char *modfilename, 496 char *version, 497 void *modinfo, 498 unsigned long version_offset) 499{ 500 if (strip_rcs_crap(version)) 501 write_version(modfilename, version, version_offset); 502} 503