1/* 2 * Copyright (c) 2000-2005, 2007-2010 3 * Todd C. Miller <Todd.Miller@courtesan.com> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 * 17 * Sponsored in part by the Defense Advanced Research Projects 18 * Agency (DARPA) and Air Force Research Laboratory, Air Force 19 * Materiel Command, USAF, under agreement number F39502-99-1-0512. 20 */ 21 22#include <config.h> 23 24#include <sys/types.h> 25#include <sys/param.h> 26#include <sys/stat.h> 27#include <stdio.h> 28#ifdef STDC_HEADERS 29# include <stdlib.h> 30# include <stddef.h> 31#else 32# ifdef HAVE_STDLIB_H 33# include <stdlib.h> 34# endif 35#endif /* STDC_HEADERS */ 36#ifdef HAVE_STRING_H 37# include <string.h> 38#endif /* HAVE_STRING_H */ 39#ifdef HAVE_STRINGS_H 40# include <strings.h> 41#endif /* HAVE_STRINGS_H */ 42#ifdef HAVE_UNISTD_H 43# include <unistd.h> 44#endif /* HAVE_UNISTD_H */ 45#ifdef HAVE_INTTYPES_H 46# include <inttypes.h> 47#endif 48#ifdef HAVE_LOGIN_CAP_H 49# include <login_cap.h> 50# ifndef LOGIN_SETENV 51# define LOGIN_SETENV 0 52# endif 53#endif /* HAVE_LOGIN_CAP_H */ 54#include <ctype.h> 55#include <errno.h> 56#include <limits.h> 57#include <pwd.h> 58 59#include "sudo.h" 60 61/* 62 * If there is no SIZE_MAX or SIZE_T_MAX we have to assume that size_t 63 * could be signed (as it is on SunOS 4.x). This just means that 64 * emalloc2() and erealloc3() cannot allocate huge amounts on such a 65 * platform but that is OK since sudo doesn't need to do so anyway. 66 */ 67#ifndef SIZE_MAX 68# ifdef SIZE_T_MAX 69# define SIZE_MAX SIZE_T_MAX 70# else 71# define SIZE_MAX INT_MAX 72# endif /* SIZE_T_MAX */ 73#endif /* SIZE_MAX */ 74 75/* 76 * Flags used in rebuild_env() 77 */ 78#undef DID_TERM 79#define DID_TERM 0x0001 80#undef DID_PATH 81#define DID_PATH 0x0002 82#undef DID_HOME 83#define DID_HOME 0x0004 84#undef DID_SHELL 85#define DID_SHELL 0x0008 86#undef DID_LOGNAME 87#define DID_LOGNAME 0x0010 88#undef DID_USER 89#define DID_USER 0x0020 90#undef DID_USERNAME 91#define DID_USERNAME 0x0040 92#undef DID_MAIL 93#define DID_MAIL 0x0080 94#undef DID_MAX 95#define DID_MAX 0x00ff 96 97#undef KEPT_TERM 98#define KEPT_TERM 0x0100 99#undef KEPT_PATH 100#define KEPT_PATH 0x0200 101#undef KEPT_HOME 102#define KEPT_HOME 0x0400 103#undef KEPT_SHELL 104#define KEPT_SHELL 0x0800 105#undef KEPT_LOGNAME 106#define KEPT_LOGNAME 0x1000 107#undef KEPT_USER 108#define KEPT_USER 0x2000 109#undef KEPT_USERNAME 110#define KEPT_USERNAME 0x4000 111#undef KEPT_MAIL 112#define KEPT_MAIL 0x8000 113#undef KEPT_MAX 114#define KEPT_MAX 0xff00 115 116struct environment { 117 char **envp; /* pointer to the new environment */ 118 size_t env_size; /* size of new_environ in char **'s */ 119 size_t env_len; /* number of slots used, not counting NULL */ 120 int owned; /* do we own envp or is it the system's? */ 121}; 122 123/* 124 * Prototypes 125 */ 126static void sudo_setenv __P((const char *, const char *, int)); 127static void sudo_putenv __P((char *, int, int)); 128 129extern char **environ; /* global environment */ 130 131/* 132 * Copy of the sudo-managed environment. 133 */ 134static struct environment env; 135 136/* 137 * Default table of "bad" variables to remove from the environment. 138 * XXX - how to omit TERMCAP if it starts with '/'? 139 */ 140static const char *initial_badenv_table[] = { 141 "IFS", 142 "CDPATH", 143 "LOCALDOMAIN", 144 "RES_OPTIONS", 145 "HOSTALIASES", 146 "NLSPATH", 147 "PATH_LOCALE", 148 "LD_*", 149 "_RLD*", 150#ifdef __hpux 151 "SHLIB_PATH", 152#endif /* __hpux */ 153#ifdef _AIX 154 "LDR_*", 155 "LIBPATH", 156 "AUTHSTATE", 157#endif 158#ifdef __APPLE__ 159 "DYLD_*", 160#endif 161#ifdef HAVE_KERB4 162 "KRB_CONF*", 163 "KRBCONFDIR", 164 "KRBTKFILE", 165#endif /* HAVE_KERB4 */ 166#ifdef HAVE_KERB5 167 "KRB5_CONFIG*", 168 "KRB5_KTNAME", 169#endif /* HAVE_KERB5 */ 170#ifdef HAVE_SECURID 171 "VAR_ACE", 172 "USR_ACE", 173 "DLC_ACE", 174#endif /* HAVE_SECURID */ 175 "TERMINFO", /* terminfo, exclusive path to terminfo files */ 176 "TERMINFO_DIRS", /* terminfo, path(s) to terminfo files */ 177 "TERMPATH", /* termcap, path(s) to termcap files */ 178 "TERMCAP", /* XXX - only if it starts with '/' */ 179 "ENV", /* ksh, file to source before script runs */ 180 "BASH_ENV", /* bash, file to source before script runs */ 181 "PS4", /* bash, prefix for lines in xtrace mode */ 182 "GLOBIGNORE", /* bash, globbing patterns to ignore */ 183 "SHELLOPTS", /* bash, extra command line options */ 184 "JAVA_TOOL_OPTIONS", /* java, extra command line options */ 185 "PERLIO_DEBUG ", /* perl, debugging output file */ 186 "PERLLIB", /* perl, search path for modules/includes */ 187 "PERL5LIB", /* perl 5, search path for modules/includes */ 188 "PERL5OPT", /* perl 5, extra command line options */ 189 "PERL5DB", /* perl 5, command used to load debugger */ 190 "FPATH", /* ksh, search path for functions */ 191 "NULLCMD", /* zsh, command for null file redirection */ 192 "READNULLCMD", /* zsh, command for null file redirection */ 193 "ZDOTDIR", /* zsh, search path for dot files */ 194 "TMPPREFIX", /* zsh, prefix for temporary files */ 195 "PYTHONHOME", /* python, module search path */ 196 "PYTHONPATH", /* python, search path */ 197 "PYTHONINSPECT", /* python, allow inspection */ 198 "PYTHONUSERBASE", /* python, per user site-packages directory */ 199 "RUBYLIB", /* ruby, library load path */ 200 "RUBYOPT", /* ruby, extra command line options */ 201 NULL 202}; 203 204/* 205 * Default table of variables to check for '%' and '/' characters. 206 */ 207static const char *initial_checkenv_table[] = { 208 "COLORTERM", 209 "LANG", 210 "LANGUAGE", 211 "LC_*", 212 "LINGUAS", 213 "TERM", 214 NULL 215}; 216 217/* 218 * Default table of variables to preserve in the environment. 219 */ 220static const char *initial_keepenv_table[] = { 221 "COLORS", 222 "DISPLAY", 223 "HOME", 224 "HOSTNAME", 225 "KRB5CCNAME", 226 "LS_COLORS", 227 "MAIL", 228 "PATH", 229 "PS1", 230 "PS2", 231 "TZ", 232 "XAUTHORITY", 233 "XAUTHORIZATION", 234 NULL 235}; 236 237/* 238 * Initialize env based on envp. 239 */ 240void 241env_init(lazy) 242 int lazy; 243{ 244 char * const *ep; 245 size_t len; 246 247 for (ep = environ; *ep != NULL; ep++) 248 continue; 249 len = (size_t)(ep - environ); 250 251 if (lazy) { 252 /* 253 * If we are already initialized due to lazy init (usualy via getenv()) 254 * we need to avoid calling malloc() as it may call getenv() itself. 255 */ 256 env.envp = environ; 257 env.env_len = len; 258 env.env_size = len; 259 } else if (!env.owned) { 260 env.env_len = len; 261 env.env_size = len + 1 + 128; 262 env.envp = emalloc2(env.env_size, sizeof(char *)); 263#ifdef ENV_DEBUG 264 memset(env.envp, 0, env.env_size * sizeof(char *)); 265#endif 266 memcpy(env.envp, environ, len * sizeof(char *)); 267 env.envp[len] = NULL; 268 env.owned = TRUE; 269 } 270} 271 272char ** 273env_get() 274{ 275 return env.envp; 276} 277 278/* 279 * Similar to setenv(3) but operates on sudo's private copy of the environment 280 * (not environ) and it always overwrites. The dupcheck param determines 281 * whether we need to verify that the variable is not already set. 282 */ 283static void 284sudo_setenv(var, val, dupcheck) 285 const char *var; 286 const char *val; 287 int dupcheck; 288{ 289 char *estring; 290 size_t esize; 291 292 esize = strlen(var) + 1 + strlen(val) + 1; 293 estring = emalloc(esize); 294 295 /* Build environment string and insert it. */ 296 if (strlcpy(estring, var, esize) >= esize || 297 strlcat(estring, "=", esize) >= esize || 298 strlcat(estring, val, esize) >= esize) { 299 300 errorx(1, "internal error, sudo_setenv() overflow"); 301 } 302 sudo_putenv(estring, dupcheck, TRUE); 303} 304 305/* 306 * Version of getenv(3) that uses our own environ pointer. 307 */ 308char * 309getenv(var) 310 const char *var; 311{ 312 char *cp, **ev; 313 size_t vlen = strlen(var); 314 315 if (env.envp == NULL) 316 env_init(TRUE); 317 318 for (ev = env.envp; (cp = *ev) != NULL; ev++) { 319 if (strncmp(var, cp, vlen) == 0 && cp[vlen] == '=') 320 return cp + vlen + 1; 321 } 322 return NULL; 323} 324 325/* 326 * Version of setenv(3) that uses our own environ pointer. 327 */ 328int 329setenv(var, val, overwrite) 330 const char *var; 331 const char *val; 332 int overwrite; 333{ 334 char *estring, *ep; 335 const char *cp; 336 size_t esize; 337 338 if (!var || *var == '\0') { 339 errno = EINVAL; 340 return -1; 341 } 342 343 if (env.envp == NULL) 344 env_init(TRUE); 345 346 /* 347 * POSIX says a var name with '=' is an error but BSD 348 * just ignores the '=' and anything after it. 349 */ 350 for (cp = var; *cp && *cp != '='; cp++) 351 ; 352 esize = (size_t)(cp - var) + 2; 353 if (val) { 354 esize += strlen(val); /* glibc treats a NULL val as "" */ 355 } 356 357 /* Allocate and fill in estring. */ 358 estring = ep = emalloc(esize); 359 for (cp = var; *cp && *cp != '='; cp++) 360 *ep++ = *cp; 361 *ep++ = '='; 362 if (val) { 363 for (cp = val; *cp; cp++) 364 *ep++ = *cp; 365 } 366 *ep = '\0'; 367 368#ifdef ENV_DEBUG 369 if (env.envp[env.env_len] != NULL) 370 errorx(1, "setenv: corrupted envp, len mismatch"); 371#endif 372 sudo_putenv(estring, TRUE, overwrite); 373 return 0; 374} 375 376/* 377 * Version of unsetenv(3) that uses our own environ pointer. 378 */ 379#ifdef UNSETENV_VOID 380void 381#else 382int 383#endif 384unsetenv(var) 385 const char *var; 386{ 387 char **ep; 388 size_t len; 389 390 if (var == NULL || *var == '\0' || strchr(var, '=') != NULL) { 391 errno = EINVAL; 392#ifdef UNSETENV_VOID 393 return; 394#else 395 return -1; 396#endif 397 } 398 399 if (env.envp == NULL) 400 env_init(TRUE); 401 402#ifdef ENV_DEBUG 403 if (env.envp[env.env_len] != NULL) 404 errorx(1, "unsetenv: corrupted envp, len mismatch"); 405#endif 406 407 len = strlen(var); 408 for (ep = env.envp; *ep != NULL;) { 409 if (strncmp(var, *ep, len) == 0 && (*ep)[len] == '=') { 410 /* Found it; shift remainder + NULL over by one. */ 411 char **cur = ep; 412 while ((*cur = *(cur + 1)) != NULL) 413 cur++; 414 /* Keep going, could be multiple instances of the var. */ 415 } else { 416 ep++; 417 } 418 } 419 env.env_len = ep - env.envp; 420#ifndef UNSETENV_VOID 421 return 0; 422#endif 423} 424 425/* 426 * Version of putenv(3) that uses our own environ pointer. 427 */ 428int 429#ifdef PUTENV_CONST 430putenv(const char *string) 431#else 432putenv(string) 433 char *string; 434#endif 435{ 436 if (env.envp == NULL) 437 env_init(TRUE); 438 439 if (strchr(string, '=') == NULL) { 440 errno = EINVAL; 441 return -1; 442 } 443#ifdef ENV_DEBUG 444 if (env.envp[env.env_len] != NULL) 445 errorx(1, "putenv: corrupted envp, len mismatch"); 446#endif 447 sudo_putenv((char *)string, TRUE, TRUE); 448 return 0; 449} 450 451/* 452 * Similar to putenv(3) but operates on sudo's private copy of the 453 * environment (not environ) and it always overwrites. The dupcheck param 454 * determines whether we need to verify that the variable is not already set. 455 * Will only overwrite an existing variable if overwrite is set. 456 */ 457static void 458sudo_putenv(str, dupcheck, overwrite) 459 char *str; 460 int dupcheck; 461 int overwrite; 462{ 463 char **ep; 464 size_t len; 465 int found = FALSE; 466 467 /* Make sure there is room for the new entry plus a NULL. */ 468 if (env.env_size > 2 && env.env_len > env.env_size - 2) { 469 if (env.env_size > SIZE_MAX - 128) 470 errorx(1, "internal error, sudo_putenv() overflow"); 471 env.env_size += 128; 472 if (env.owned) { 473 env.envp = erealloc3(env.envp, env.env_size, sizeof(char *)); 474 } else { 475 /* We don't own env.envp, allocate a new one. */ 476 ep = emalloc2(env.env_size, sizeof(char *)); 477 memcpy(ep, env.envp, env.env_size * sizeof(char *)); 478 env.envp = ep; 479 env.owned = TRUE; 480 } 481#ifdef ENV_DEBUG 482 memset(env.envp + env.env_len, 0, 483 (env.env_size - env.env_len) * sizeof(char *)); 484#endif 485 } 486 487#ifdef ENV_DEBUG 488 if (env.envp[env.env_len] != NULL) 489 errorx(1, "sudo_putenv: corrupted envp, len mismatch"); 490#endif 491 492 if (dupcheck) { 493 len = (strchr(str, '=') - str) + 1; 494 for (ep = env.envp; *ep != NULL; ep++) { 495 if (strncmp(str, *ep, len) == 0) { 496 if (overwrite) 497 *ep = str; 498 found = TRUE; 499 break; 500 } 501 } 502 /* Prune out extra instances of the variable we just overwrote. */ 503 if (found && overwrite) { 504 while (*++ep != NULL) { 505 if (strncmp(str, *ep, len) == 0) { 506 char **cur = ep; 507 while ((*cur = *(cur + 1)) != NULL) 508 cur++; 509 ep--; 510 } 511 } 512 env.env_len = ep - env.envp; 513 } 514 } 515 516 if (!found) { 517 ep = env.envp + env.env_len; 518 env.env_len++; 519 *ep++ = str; 520 *ep = NULL; 521 } 522} 523 524/* 525 * Merge another environment with our private copy. 526 */ 527void 528env_merge(envp, overwrite) 529 char * const envp[]; 530 int overwrite; 531{ 532 char * const *ep; 533 534 for (ep = envp; *ep != NULL; ep++) 535 sudo_putenv(*ep, TRUE, overwrite); 536} 537 538/* 539 * Check the env_delete blacklist. 540 * Returns TRUE if the variable was found, else FALSE. 541 */ 542static int 543matches_env_delete(var) 544 const char *var; 545{ 546 struct list_member *cur; 547 size_t len; 548 int iswild, match = FALSE; 549 550 /* Skip anything listed in env_delete. */ 551 for (cur = def_env_delete; cur; cur = cur->next) { 552 len = strlen(cur->value); 553 /* Deal with '*' wildcard */ 554 if (cur->value[len - 1] == '*') { 555 len--; 556 iswild = TRUE; 557 } else 558 iswild = FALSE; 559 if (strncmp(cur->value, var, len) == 0 && 560 (iswild || var[len] == '=')) { 561 match = TRUE; 562 break; 563 } 564 } 565 return match; 566} 567 568/* 569 * Apply the env_check list. 570 * Returns TRUE if the variable is allowed, FALSE if denied 571 * or -1 if no match. 572 */ 573static int 574matches_env_check(var) 575 const char *var; 576{ 577 struct list_member *cur; 578 size_t len; 579 int iswild, keepit = -1; 580 581 for (cur = def_env_check; cur; cur = cur->next) { 582 len = strlen(cur->value); 583 /* Deal with '*' wildcard */ 584 if (cur->value[len - 1] == '*') { 585 len--; 586 iswild = TRUE; 587 } else 588 iswild = FALSE; 589 if (strncmp(cur->value, var, len) == 0 && 590 (iswild || var[len] == '=')) { 591 keepit = !strpbrk(var, "/%"); 592 break; 593 } 594 } 595 return keepit; 596} 597 598/* 599 * Check the env_keep list. 600 * Returns TRUE if the variable is allowed else FALSE. 601 */ 602static int 603matches_env_keep(var) 604 const char *var; 605{ 606 struct list_member *cur; 607 size_t len; 608 int iswild, keepit = FALSE; 609 610 /* Preserve SHELL variable for "sudo -s". */ 611 if (ISSET(sudo_mode, MODE_SHELL) && strncmp(var, "SHELL=", 6) == 0) 612 return TRUE; 613 614 for (cur = def_env_keep; cur; cur = cur->next) { 615 len = strlen(cur->value); 616 /* Deal with '*' wildcard */ 617 if (cur->value[len - 1] == '*') { 618 len--; 619 iswild = TRUE; 620 } else 621 iswild = FALSE; 622 if (strncmp(cur->value, var, len) == 0 && 623 (iswild || var[len] == '=')) { 624 keepit = TRUE; 625 break; 626 } 627 } 628 return keepit; 629} 630 631static void 632env_update_didvar(ep, didvar) 633 const char *ep; 634 unsigned int *didvar; 635{ 636 switch (*ep) { 637 case 'H': 638 if (strncmp(ep, "HOME=", 5) == 0) 639 SET(*didvar, DID_HOME); 640 break; 641 case 'L': 642 if (strncmp(ep, "LOGNAME=", 8) == 0) 643 SET(*didvar, DID_LOGNAME); 644 break; 645 case 'M': 646 if (strncmp(ep, "MAIL=", 5) == 0) 647 SET(*didvar, DID_MAIL); 648 break; 649 case 'P': 650 if (strncmp(ep, "PATH=", 5) == 0) 651 SET(*didvar, DID_PATH); 652 break; 653 case 'S': 654 if (strncmp(ep, "SHELL=", 6) == 0) 655 SET(*didvar, DID_SHELL); 656 break; 657 case 'T': 658 if (strncmp(ep, "TERM=", 5) == 0) 659 SET(*didvar, DID_TERM); 660 break; 661 case 'U': 662 if (strncmp(ep, "USER=", 5) == 0) 663 SET(*didvar, DID_USER); 664 if (strncmp(ep, "USERNAME=", 5) == 0) 665 SET(*didvar, DID_USERNAME); 666 break; 667 } 668} 669 670/* 671 * Build a new environment and ether clear potentially dangerous 672 * variables from the old one or start with a clean slate. 673 * Also adds sudo-specific variables (SUDO_*). 674 */ 675void 676rebuild_env(noexec) 677 int noexec; 678{ 679 char **old_envp, **ep, *cp, *ps1; 680 char idbuf[MAX_UID_T_LEN + 1]; 681 unsigned int didvar; 682 int reset_home = FALSE; 683 684 /* 685 * Either clean out the environment or reset to a safe default. 686 */ 687 ps1 = NULL; 688 didvar = 0; 689 env.env_len = 0; 690 env.env_size = 128; 691 old_envp = env.envp; 692 env.envp = emalloc2(env.env_size, sizeof(char *)); 693#ifdef ENV_DEBUG 694 memset(env.envp, 0, env.env_size * sizeof(char *)); 695#else 696 env.envp[0] = NULL; 697#endif 698 699 /* Reset HOME based on target user if configured to. */ 700 if (ISSET(sudo_mode, MODE_RUN)) { 701 if (def_always_set_home || 702 ISSET(sudo_mode, MODE_RESET_HOME | MODE_LOGIN_SHELL) || 703 (ISSET(sudo_mode, MODE_SHELL) && def_set_home)) 704 reset_home = TRUE; 705 } 706 707 if (def_env_reset || ISSET(sudo_mode, MODE_LOGIN_SHELL)) { 708 /* 709 * If starting with a fresh environment, initialize it based on 710 * /etc/environment or login.conf. For "sudo -i" we want those 711 * variables to override the invoking user's environment, so we 712 * defer reading them until later. 713 */ 714 if (!ISSET(sudo_mode, MODE_LOGIN_SHELL)) { 715#ifdef HAVE_LOGIN_CAP_H 716 /* Insert login class environment variables. */ 717 if (login_class) { 718 login_cap_t *lc = login_getclass(login_class); 719 if (lc != NULL) { 720 setusercontext(lc, runas_pw, runas_pw->pw_uid, 721 LOGIN_SETPATH|LOGIN_SETENV); 722 login_close(lc); 723 } 724 } 725#endif /* HAVE_LOGIN_CAP_H */ 726#if defined(_AIX) || (defined(__linux__) && !defined(HAVE_PAM)) 727 /* Insert system-wide environment variables. */ 728 read_env_file(_PATH_ENVIRONMENT, TRUE); 729#endif 730 for (ep = env.envp; *ep; ep++) 731 env_update_didvar(*ep, &didvar); 732 } 733 734 /* Pull in vars we want to keep from the old environment. */ 735 for (ep = old_envp; *ep; ep++) { 736 int keepit; 737 738 /* Skip variables with values beginning with () (bash functions) */ 739 if ((cp = strchr(*ep, '=')) != NULL) { 740 if (strncmp(cp, "=() ", 3) == 0) 741 continue; 742 } 743 744 /* 745 * First check certain variables for '%' and '/' characters. 746 * If no match there, check the keep list. 747 * If nothing matched, we remove it from the environment. 748 */ 749 keepit = matches_env_check(*ep); 750 if (keepit == -1) 751 keepit = matches_env_keep(*ep); 752 753 /* For SUDO_PS1 -> PS1 conversion. */ 754 if (strncmp(*ep, "SUDO_PS1=", 8) == 0) 755 ps1 = *ep + 5; 756 757 if (keepit) { 758 /* Preserve variable. */ 759 switch (**ep) { 760 case 'H': 761 if (strncmp(*ep, "HOME=", 5) == 0 && !ISSET(sudo_mode, MODE_RESET_HOME)) 762 SET(didvar, DID_HOME); 763 break; 764 case 'L': 765 if (strncmp(*ep, "LOGNAME=", 8) == 0) 766 SET(didvar, DID_LOGNAME); 767 break; 768 case 'M': 769 if (strncmp(*ep, "MAIL=", 5) == 0) 770 SET(didvar, DID_MAIL); 771 break; 772 case 'P': 773 if (strncmp(*ep, "PATH=", 5) == 0) 774 SET(didvar, DID_PATH); 775 break; 776 case 'S': 777 if (strncmp(*ep, "SHELL=", 6) == 0) 778 SET(didvar, DID_SHELL); 779 break; 780 case 'T': 781 if (strncmp(*ep, "TERM=", 5) == 0) 782 SET(didvar, DID_TERM); 783 break; 784 case 'U': 785 if (strncmp(*ep, "USER=", 5) == 0) 786 SET(didvar, DID_USER); 787 if (strncmp(*ep, "USERNAME=", 5) == 0) 788 SET(didvar, DID_USERNAME); 789 break; 790 } 791 sudo_putenv(*ep, FALSE, FALSE); 792 } 793 } 794 didvar |= didvar << 8; /* convert DID_* to KEPT_* */ 795 796 /* 797 * Add in defaults. In -i mode these come from the runas user, 798 * otherwise they may be from the user's environment (depends 799 * on sudoers options). 800 */ 801 if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) { 802 sudo_setenv("SHELL", runas_pw->pw_shell, ISSET(didvar, DID_SHELL)); 803 sudo_setenv("LOGNAME", runas_pw->pw_name, 804 ISSET(didvar, DID_LOGNAME)); 805 sudo_setenv("USER", runas_pw->pw_name, ISSET(didvar, DID_USER)); 806 sudo_setenv("USERNAME", runas_pw->pw_name, 807 ISSET(didvar, DID_USERNAME)); 808 } else { 809 if (!ISSET(didvar, DID_SHELL)) 810 sudo_setenv("SHELL", sudo_user.pw->pw_shell, FALSE); 811 /* We will set LOGNAME later in the !def_set_logname case. */ 812 if (!def_set_logname) { 813 if (!ISSET(didvar, DID_LOGNAME)) 814 sudo_setenv("LOGNAME", user_name, FALSE); 815 if (!ISSET(didvar, DID_USER)) 816 sudo_setenv("USER", user_name, FALSE); 817 if (!ISSET(didvar, DID_USERNAME)) 818 sudo_setenv("USERNAME", user_name, FALSE); 819 } 820 } 821 822 /* If we didn't keep HOME, reset it based on target user. */ 823 if (!ISSET(didvar, KEPT_HOME)) 824 reset_home = TRUE; 825 826 /* 827 * Set MAIL to target user in -i mode or if MAIL is not preserved 828 * from user's environment. 829 */ 830 if (ISSET(sudo_mode, MODE_LOGIN_SHELL) || !ISSET(didvar, KEPT_MAIL)) { 831 cp = _PATH_MAILDIR; 832 if (cp[sizeof(_PATH_MAILDIR) - 2] == '/') 833 easprintf(&cp, "MAIL=%s%s", _PATH_MAILDIR, runas_pw->pw_name); 834 else 835 easprintf(&cp, "MAIL=%s/%s", _PATH_MAILDIR, runas_pw->pw_name); 836 sudo_putenv(cp, ISSET(didvar, DID_MAIL), TRUE); 837 } 838 } else { 839 /* 840 * Copy environ entries as long as they don't match env_delete or 841 * env_check. 842 */ 843 for (ep = old_envp; *ep; ep++) { 844 int okvar; 845 846 /* Skip variables with values beginning with () (bash functions) */ 847 if ((cp = strchr(*ep, '=')) != NULL) { 848 if (strncmp(cp, "=() ", 3) == 0) 849 continue; 850 } 851 852 /* 853 * First check variables against the blacklist in env_delete. 854 * If no match there check for '%' and '/' characters. 855 */ 856 okvar = matches_env_delete(*ep) != TRUE; 857 if (okvar) 858 okvar = matches_env_check(*ep) != FALSE; 859 860 if (okvar) { 861 if (strncmp(*ep, "SUDO_PS1=", 9) == 0) 862 ps1 = *ep + 5; 863 else if (strncmp(*ep, "PATH=", 5) == 0) 864 SET(didvar, DID_PATH); 865 else if (strncmp(*ep, "TERM=", 5) == 0) 866 SET(didvar, DID_TERM); 867 sudo_putenv(*ep, FALSE, FALSE); 868 } 869 } 870 } 871 /* Replace the PATH envariable with a secure one? */ 872 if (def_secure_path && !user_is_exempt()) { 873 sudo_setenv("PATH", def_secure_path, TRUE); 874 SET(didvar, DID_PATH); 875 } 876 877 /* 878 * Set $USER, $LOGNAME and $USERNAME to target if "set_logname" is not 879 * disabled. We skip this if we are running a login shell (because 880 * they have already been set) or sudoedit (because we want the editor 881 * to find the invoking user's startup files). 882 */ 883 if (def_set_logname && !ISSET(sudo_mode, MODE_LOGIN_SHELL|MODE_EDIT)) { 884 if (!ISSET(didvar, KEPT_LOGNAME)) 885 sudo_setenv("LOGNAME", runas_pw->pw_name, TRUE); 886 if (!ISSET(didvar, KEPT_USER)) 887 sudo_setenv("USER", runas_pw->pw_name, TRUE); 888 if (!ISSET(didvar, KEPT_USERNAME)) 889 sudo_setenv("USERNAME", runas_pw->pw_name, TRUE); 890 } 891 892 /* Set $HOME to target user if not preserving user's value. */ 893 if (reset_home) 894 sudo_setenv("HOME", runas_pw->pw_dir, TRUE); 895 896 /* Provide default values for $TERM and $PATH if they are not set. */ 897 if (!ISSET(didvar, DID_TERM)) 898 sudo_putenv("TERM=unknown", FALSE, FALSE); 899 if (!ISSET(didvar, DID_PATH)) 900 sudo_setenv("PATH", _PATH_STDPATH, FALSE); 901 902 /* 903 * Preload a noexec file? For a list of LD_PRELOAD-alikes, see 904 * http://www.fortran-2000.com/ArnaudRecipes/sharedlib.html 905 * XXX - should prepend to original value, if any 906 */ 907 if (noexec && def_noexec_file != NULL) { 908#if defined(__darwin__) || defined(__APPLE__) 909 sudo_setenv("DYLD_INSERT_LIBRARIES", def_noexec_file, TRUE); 910 sudo_setenv("DYLD_FORCE_FLAT_NAMESPACE", "", TRUE); 911#else 912# if defined(__osf__) || defined(__sgi) 913 easprintf(&cp, "%s:DEFAULT", def_noexec_file); 914 sudo_setenv("_RLD_LIST", cp, TRUE); 915 efree(cp); 916# else 917# ifdef _AIX 918 sudo_setenv("LDR_PRELOAD", def_noexec_file, TRUE); 919# else 920 sudo_setenv("LD_PRELOAD", def_noexec_file, TRUE); 921# endif /* _AIX */ 922# endif /* __osf__ || __sgi */ 923#endif /* __darwin__ || __APPLE__ */ 924 } 925 926 /* Set PS1 if SUDO_PS1 is set. */ 927 if (ps1 != NULL) 928 sudo_putenv(ps1, TRUE, TRUE); 929 930 /* Add the SUDO_COMMAND envariable (cmnd + args). */ 931 if (user_args) { 932 easprintf(&cp, "%s %s", user_cmnd, user_args); 933 sudo_setenv("SUDO_COMMAND", cp, TRUE); 934 efree(cp); 935 } else { 936 sudo_setenv("SUDO_COMMAND", user_cmnd, TRUE); 937 } 938 939 /* Add the SUDO_USER, SUDO_UID, SUDO_GID environment variables. */ 940 sudo_setenv("SUDO_USER", user_name, TRUE); 941 snprintf(idbuf, sizeof(idbuf), "%u", (unsigned int) user_uid); 942 sudo_setenv("SUDO_UID", idbuf, TRUE); 943 snprintf(idbuf, sizeof(idbuf), "%u", (unsigned int) user_gid); 944 sudo_setenv("SUDO_GID", idbuf, TRUE); 945 946 /* Free old environment. */ 947 efree(old_envp); 948} 949 950void 951insert_env_vars(env_vars) 952 struct list_member *env_vars; 953{ 954 struct list_member *cur; 955 956 /* Add user-specified environment variables. */ 957 for (cur = env_vars; cur != NULL; cur = cur->next) 958 putenv(cur->value); 959} 960 961/* 962 * Validate the list of environment variables passed in on the command 963 * line against env_delete, env_check, and env_keep. 964 * Calls log_fatal() if any specified variables are not allowed. 965 */ 966void 967validate_env_vars(env_vars) 968 struct list_member *env_vars; 969{ 970 struct list_member *var; 971 char *eq, *bad = NULL; 972 size_t len, blen = 0, bsize = 0; 973 int okvar; 974 975 /* Add user-specified environment variables. */ 976 for (var = env_vars; var != NULL; var = var->next) { 977 if (def_secure_path && !user_is_exempt() && 978 strncmp(var->value, "PATH=", 5) == 0) { 979 okvar = FALSE; 980 } else if (def_env_reset) { 981 okvar = matches_env_check(var->value); 982 if (okvar == -1) 983 okvar = matches_env_keep(var->value); 984 } else { 985 okvar = matches_env_delete(var->value) == FALSE; 986 if (okvar == FALSE) 987 okvar = matches_env_check(var->value) != FALSE; 988 } 989 if (okvar == FALSE) { 990 /* Not allowed, add to error string, allocating as needed. */ 991 if ((eq = strchr(var->value, '=')) != NULL) 992 *eq = '\0'; 993 len = strlen(var->value) + 2; 994 if (blen + len >= bsize) { 995 do { 996 bsize += 1024; 997 } while (blen + len >= bsize); 998 bad = erealloc(bad, bsize); 999 bad[blen] = '\0'; 1000 } 1001 strlcat(bad, var->value, bsize); 1002 strlcat(bad, ", ", bsize); 1003 blen += len; 1004 if (eq != NULL) 1005 *eq = '='; 1006 } 1007 } 1008 if (bad != NULL) { 1009 bad[blen - 2] = '\0'; /* remove trailing ", " */ 1010 log_fatal(NO_MAIL, 1011 "sorry, you are not allowed to set the following environment variables: %s", bad); 1012 /* NOTREACHED */ 1013 efree(bad); 1014 } 1015} 1016 1017/* 1018 * Read in /etc/environment ala AIX and Linux. 1019 * Lines may be in either of three formats: 1020 * NAME=VALUE 1021 * NAME="VALUE" 1022 * NAME='VALUE' 1023 * with an optional "export" prefix so the shell can source the file. 1024 * Invalid lines, blank lines, or lines consisting solely of a comment 1025 * character are skipped. 1026 */ 1027void 1028read_env_file(path, overwrite) 1029 const char *path; 1030 int overwrite; 1031{ 1032 FILE *fp; 1033 char *cp, *var, *val; 1034 size_t var_len, val_len; 1035 1036 if ((fp = fopen(path, "r")) == NULL) 1037 return; 1038 1039 while ((var = sudo_parseln(fp)) != NULL) { 1040 /* Skip blank or comment lines */ 1041 if (*var == '\0') 1042 continue; 1043 1044 /* Skip optional "export " */ 1045 if (strncmp(var, "export", 6) == 0 && isspace((unsigned char) var[6])) { 1046 var += 7; 1047 while (isspace((unsigned char) *var)) { 1048 var++; 1049 } 1050 } 1051 1052 /* Must be of the form name=["']value['"] */ 1053 for (val = var; *val != '\0' && *val != '='; val++) 1054 ; 1055 if (var == val || *val != '=') 1056 continue; 1057 var_len = (size_t)(val - var); 1058 val_len = strlen(++val); 1059 1060 /* Strip leading and trailing single/double quotes */ 1061 if ((val[0] == '\'' || val[0] == '\"') && val[0] == val[val_len - 1]) { 1062 val[val_len - 1] = '\0'; 1063 val++; 1064 val_len -= 2; 1065 } 1066 1067 cp = emalloc(var_len + 1 + val_len + 1); 1068 memcpy(cp, var, var_len + 1); /* includes '=' */ 1069 memcpy(cp + var_len + 1, val, val_len + 1); /* includes NUL */ 1070 1071 sudo_putenv(cp, TRUE, overwrite); 1072 } 1073 fclose(fp); 1074} 1075 1076void 1077init_envtables() 1078{ 1079 struct list_member *cur; 1080 const char **p; 1081 1082 /* Fill in the "env_delete" list. */ 1083 for (p = initial_badenv_table; *p; p++) { 1084 cur = ecalloc(1, sizeof(struct list_member)); 1085 cur->value = estrdup(*p); 1086 cur->next = def_env_delete; 1087 def_env_delete = cur; 1088 } 1089 1090 /* Fill in the "env_check" list. */ 1091 for (p = initial_checkenv_table; *p; p++) { 1092 cur = ecalloc(1, sizeof(struct list_member)); 1093 cur->value = estrdup(*p); 1094 cur->next = def_env_check; 1095 def_env_check = cur; 1096 } 1097 1098 /* Fill in the "env_keep" list. */ 1099 for (p = initial_keepenv_table; *p; p++) { 1100 cur = ecalloc(1, sizeof(struct list_member)); 1101 cur->value = estrdup(*p); 1102 cur->next = def_env_keep; 1103 def_env_keep = cur; 1104 } 1105} 1106