Annotation of embedaddon/sudo/plugins/sudoers/env.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (c) 2000-2005, 2007-2011
! 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: #include <ctype.h>
! 46: #include <errno.h>
! 47: #include <pwd.h>
! 48:
! 49: #include "sudoers.h"
! 50:
! 51: /*
! 52: * Flags used in rebuild_env()
! 53: */
! 54: #undef DID_TERM
! 55: #define DID_TERM 0x0001
! 56: #undef DID_PATH
! 57: #define DID_PATH 0x0002
! 58: #undef DID_HOME
! 59: #define DID_HOME 0x0004
! 60: #undef DID_SHELL
! 61: #define DID_SHELL 0x0008
! 62: #undef DID_LOGNAME
! 63: #define DID_LOGNAME 0x0010
! 64: #undef DID_USER
! 65: #define DID_USER 0x0020
! 66: #undef DID_USERNAME
! 67: #define DID_USERNAME 0x0040
! 68: #undef DID_MAIL
! 69: #define DID_MAIL 0x0080
! 70: #undef DID_MAX
! 71: #define DID_MAX 0x00ff
! 72:
! 73: #undef KEPT_TERM
! 74: #define KEPT_TERM 0x0100
! 75: #undef KEPT_PATH
! 76: #define KEPT_PATH 0x0200
! 77: #undef KEPT_HOME
! 78: #define KEPT_HOME 0x0400
! 79: #undef KEPT_SHELL
! 80: #define KEPT_SHELL 0x0800
! 81: #undef KEPT_LOGNAME
! 82: #define KEPT_LOGNAME 0x1000
! 83: #undef KEPT_USER
! 84: #define KEPT_USER 0x2000
! 85: #undef KEPT_USERNAME
! 86: #define KEPT_USERNAME 0x4000
! 87: #undef KEPT_MAIL
! 88: #define KEPT_MAIL 0x8000
! 89: #undef KEPT_MAX
! 90: #define KEPT_MAX 0xff00
! 91:
! 92: struct environment {
! 93: char **envp; /* pointer to the new environment */
! 94: size_t env_size; /* size of new_environ in char **'s */
! 95: size_t env_len; /* number of slots used, not counting NULL */
! 96: };
! 97:
! 98: /*
! 99: * Prototypes
! 100: */
! 101: static void sudo_setenv(const char *, const char *, int);
! 102: static void sudo_putenv(char *, int, int);
! 103:
! 104: /*
! 105: * Copy of the sudo-managed environment.
! 106: */
! 107: static struct environment env;
! 108:
! 109: /*
! 110: * Default table of "bad" variables to remove from the environment.
! 111: * XXX - how to omit TERMCAP if it starts with '/'?
! 112: */
! 113: static const char *initial_badenv_table[] = {
! 114: "IFS",
! 115: "CDPATH",
! 116: "LOCALDOMAIN",
! 117: "RES_OPTIONS",
! 118: "HOSTALIASES",
! 119: "NLSPATH",
! 120: "PATH_LOCALE",
! 121: "LD_*",
! 122: "_RLD*",
! 123: #ifdef __hpux
! 124: "SHLIB_PATH",
! 125: #endif /* __hpux */
! 126: #ifdef _AIX
! 127: "LDR_*",
! 128: "LIBPATH",
! 129: "AUTHSTATE",
! 130: #endif
! 131: #ifdef __APPLE__
! 132: "DYLD_*",
! 133: #endif
! 134: #ifdef HAVE_KERB4
! 135: "KRB_CONF*",
! 136: "KRBCONFDIR",
! 137: "KRBTKFILE",
! 138: #endif /* HAVE_KERB4 */
! 139: #ifdef HAVE_KERB5
! 140: "KRB5_CONFIG*",
! 141: "KRB5_KTNAME",
! 142: #endif /* HAVE_KERB5 */
! 143: #ifdef HAVE_SECURID
! 144: "VAR_ACE",
! 145: "USR_ACE",
! 146: "DLC_ACE",
! 147: #endif /* HAVE_SECURID */
! 148: "TERMINFO", /* terminfo, exclusive path to terminfo files */
! 149: "TERMINFO_DIRS", /* terminfo, path(s) to terminfo files */
! 150: "TERMPATH", /* termcap, path(s) to termcap files */
! 151: "TERMCAP", /* XXX - only if it starts with '/' */
! 152: "ENV", /* ksh, file to source before script runs */
! 153: "BASH_ENV", /* bash, file to source before script runs */
! 154: "PS4", /* bash, prefix for lines in xtrace mode */
! 155: "GLOBIGNORE", /* bash, globbing patterns to ignore */
! 156: "SHELLOPTS", /* bash, extra command line options */
! 157: "JAVA_TOOL_OPTIONS", /* java, extra command line options */
! 158: "PERLIO_DEBUG ", /* perl, debugging output file */
! 159: "PERLLIB", /* perl, search path for modules/includes */
! 160: "PERL5LIB", /* perl 5, search path for modules/includes */
! 161: "PERL5OPT", /* perl 5, extra command line options */
! 162: "PERL5DB", /* perl 5, command used to load debugger */
! 163: "FPATH", /* ksh, search path for functions */
! 164: "NULLCMD", /* zsh, command for null file redirection */
! 165: "READNULLCMD", /* zsh, command for null file redirection */
! 166: "ZDOTDIR", /* zsh, search path for dot files */
! 167: "TMPPREFIX", /* zsh, prefix for temporary files */
! 168: "PYTHONHOME", /* python, module search path */
! 169: "PYTHONPATH", /* python, search path */
! 170: "PYTHONINSPECT", /* python, allow inspection */
! 171: "PYTHONUSERBASE", /* python, per user site-packages directory */
! 172: "RUBYLIB", /* ruby, library load path */
! 173: "RUBYOPT", /* ruby, extra command line options */
! 174: NULL
! 175: };
! 176:
! 177: /*
! 178: * Default table of variables to check for '%' and '/' characters.
! 179: */
! 180: static const char *initial_checkenv_table[] = {
! 181: "COLORTERM",
! 182: "LANG",
! 183: "LANGUAGE",
! 184: "LC_*",
! 185: "LINGUAS",
! 186: "TERM",
! 187: NULL
! 188: };
! 189:
! 190: /*
! 191: * Default table of variables to preserve in the environment.
! 192: */
! 193: static const char *initial_keepenv_table[] = {
! 194: "COLORS",
! 195: "DISPLAY",
! 196: "HOSTNAME",
! 197: "KRB5CCNAME",
! 198: "LS_COLORS",
! 199: "PATH",
! 200: "PS1",
! 201: "PS2",
! 202: "TZ",
! 203: "XAUTHORITY",
! 204: "XAUTHORIZATION",
! 205: #ifdef _AIX
! 206: "ODMDIR",
! 207: #endif
! 208: NULL
! 209: };
! 210:
! 211: /*
! 212: * Initialize env based on envp.
! 213: */
! 214: void
! 215: env_init(char * const envp[])
! 216: {
! 217: char * const *ep;
! 218: size_t len;
! 219:
! 220: for (ep = envp; *ep != NULL; ep++)
! 221: continue;
! 222: len = (size_t)(ep - envp);
! 223:
! 224: env.env_len = len;
! 225: env.env_size = len + 1 + 128;
! 226: env.envp = emalloc2(env.env_size, sizeof(char *));
! 227: #ifdef ENV_DEBUG
! 228: memset(env.envp, 0, env.env_size * sizeof(char *));
! 229: #endif
! 230: memcpy(env.envp, envp, len * sizeof(char *));
! 231: env.envp[len] = '\0';
! 232: }
! 233:
! 234: char **
! 235: env_get(void)
! 236: {
! 237: return env.envp;
! 238: }
! 239:
! 240: /*
! 241: * Similar to setenv(3) but operates on sudo's private copy of the environment
! 242: * (not environ) and it always overwrites. The dupcheck param determines
! 243: * whether we need to verify that the variable is not already set.
! 244: */
! 245: static void
! 246: sudo_setenv(const char *var, const char *val, int dupcheck)
! 247: {
! 248: char *estring;
! 249: size_t esize;
! 250:
! 251: esize = strlen(var) + 1 + strlen(val) + 1;
! 252: estring = emalloc(esize);
! 253:
! 254: /* Build environment string and insert it. */
! 255: if (strlcpy(estring, var, esize) >= esize ||
! 256: strlcat(estring, "=", esize) >= esize ||
! 257: strlcat(estring, val, esize) >= esize) {
! 258:
! 259: errorx(1, _("internal error, sudo_setenv() overflow"));
! 260: }
! 261: sudo_putenv(estring, dupcheck, TRUE);
! 262: }
! 263:
! 264: /*
! 265: * Similar to putenv(3) but operates on sudo's private copy of the
! 266: * environment (not environ) and it always overwrites. The dupcheck param
! 267: * determines whether we need to verify that the variable is not already set.
! 268: * Will only overwrite an existing variable if overwrite is set.
! 269: */
! 270: static void
! 271: sudo_putenv(char *str, int dupcheck, int overwrite)
! 272: {
! 273: char **ep;
! 274: size_t len;
! 275: int found = FALSE;
! 276:
! 277: /* Make sure there is room for the new entry plus a NULL. */
! 278: if (env.env_len + 2 > env.env_size) {
! 279: env.env_size += 128;
! 280: env.envp = erealloc3(env.envp, env.env_size, sizeof(char *));
! 281: #ifdef ENV_DEBUG
! 282: memset(env.envp + env.env_len, 0,
! 283: (env.env_size - env.env_len) * sizeof(char *));
! 284: #endif
! 285: }
! 286:
! 287: #ifdef ENV_DEBUG
! 288: if (env.envp[env.env_len] != NULL)
! 289: errorx(1, _("sudo_putenv: corrupted envp, length mismatch"));
! 290: #endif
! 291:
! 292: if (dupcheck) {
! 293: len = (strchr(str, '=') - str) + 1;
! 294: for (ep = env.envp; !found && *ep != NULL; ep++) {
! 295: if (strncmp(str, *ep, len) == 0) {
! 296: if (overwrite)
! 297: *ep = str;
! 298: found = TRUE;
! 299: }
! 300: }
! 301: /* Prune out duplicate variables. */
! 302: if (found && overwrite) {
! 303: while (*ep != NULL) {
! 304: if (strncmp(str, *ep, len) == 0) {
! 305: char **cur = ep;
! 306: while ((*cur = *(cur + 1)) != NULL)
! 307: cur++;
! 308: } else {
! 309: ep++;
! 310: }
! 311: }
! 312: env.env_len = ep - env.envp;
! 313: }
! 314: }
! 315:
! 316: if (!found) {
! 317: ep = env.envp + env.env_len;
! 318: env.env_len++;
! 319: *ep++ = str;
! 320: *ep = NULL;
! 321: }
! 322: }
! 323:
! 324: /*
! 325: * Check the env_delete blacklist.
! 326: * Returns TRUE if the variable was found, else false.
! 327: */
! 328: static int
! 329: matches_env_delete(const char *var)
! 330: {
! 331: struct list_member *cur;
! 332: size_t len;
! 333: int iswild, match = FALSE;
! 334:
! 335: /* Skip anything listed in env_delete. */
! 336: for (cur = def_env_delete; cur; cur = cur->next) {
! 337: len = strlen(cur->value);
! 338: /* Deal with '*' wildcard */
! 339: if (cur->value[len - 1] == '*') {
! 340: len--;
! 341: iswild = TRUE;
! 342: } else
! 343: iswild = FALSE;
! 344: if (strncmp(cur->value, var, len) == 0 &&
! 345: (iswild || var[len] == '=')) {
! 346: match = TRUE;
! 347: break;
! 348: }
! 349: }
! 350: return match;
! 351: }
! 352:
! 353: /*
! 354: * Apply the env_check list.
! 355: * Returns TRUE if the variable is allowed, FALSE if denied
! 356: * or -1 if no match.
! 357: */
! 358: static int
! 359: matches_env_check(const char *var)
! 360: {
! 361: struct list_member *cur;
! 362: size_t len;
! 363: int iswild, keepit = -1;
! 364:
! 365: for (cur = def_env_check; cur; cur = cur->next) {
! 366: len = strlen(cur->value);
! 367: /* Deal with '*' wildcard */
! 368: if (cur->value[len - 1] == '*') {
! 369: len--;
! 370: iswild = TRUE;
! 371: } else
! 372: iswild = FALSE;
! 373: if (strncmp(cur->value, var, len) == 0 &&
! 374: (iswild || var[len] == '=')) {
! 375: keepit = !strpbrk(var, "/%");
! 376: break;
! 377: }
! 378: }
! 379: return keepit;
! 380: }
! 381:
! 382: /*
! 383: * Check the env_keep list.
! 384: * Returns TRUE if the variable is allowed else FALSE.
! 385: */
! 386: static int
! 387: matches_env_keep(const char *var)
! 388: {
! 389: struct list_member *cur;
! 390: size_t len;
! 391: int iswild, keepit = FALSE;
! 392:
! 393: /* Preserve SHELL variable for "sudo -s". */
! 394: if (ISSET(sudo_mode, MODE_SHELL) && strncmp(var, "SHELL=", 6) == 0)
! 395: return TRUE;
! 396:
! 397: for (cur = def_env_keep; cur; cur = cur->next) {
! 398: len = strlen(cur->value);
! 399: /* Deal with '*' wildcard */
! 400: if (cur->value[len - 1] == '*') {
! 401: len--;
! 402: iswild = TRUE;
! 403: } else
! 404: iswild = FALSE;
! 405: if (strncmp(cur->value, var, len) == 0 &&
! 406: (iswild || var[len] == '=')) {
! 407: keepit = TRUE;
! 408: break;
! 409: }
! 410: }
! 411: return keepit;
! 412: }
! 413:
! 414: /*
! 415: * Build a new environment and ether clear potentially dangerous
! 416: * variables from the old one or start with a clean slate.
! 417: * Also adds sudo-specific variables (SUDO_*).
! 418: */
! 419: void
! 420: rebuild_env(void)
! 421: {
! 422: char **old_envp, **ep, *cp, *ps1;
! 423: char idbuf[MAX_UID_T_LEN];
! 424: unsigned int didvar;
! 425: int reset_home = FALSE;
! 426:
! 427: /*
! 428: * Either clean out the environment or reset to a safe default.
! 429: */
! 430: ps1 = NULL;
! 431: didvar = 0;
! 432: env.env_len = 0;
! 433: env.env_size = 128;
! 434: old_envp = env.envp;
! 435: env.envp = emalloc2(env.env_size, sizeof(char *));
! 436: #ifdef ENV_DEBUG
! 437: memset(env.envp, 0, env.env_size * sizeof(char *));
! 438: #endif
! 439:
! 440: /* Reset HOME based on target user if configured to. */
! 441: if (ISSET(sudo_mode, MODE_RUN)) {
! 442: if (def_always_set_home ||
! 443: ISSET(sudo_mode, MODE_RESET_HOME | MODE_LOGIN_SHELL) ||
! 444: (ISSET(sudo_mode, MODE_SHELL) && def_set_home))
! 445: reset_home = TRUE;
! 446: }
! 447:
! 448: if (def_env_reset || ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
! 449: /* Pull in vars we want to keep from the old environment. */
! 450: for (ep = old_envp; *ep; ep++) {
! 451: int keepit;
! 452:
! 453: /* Skip variables with values beginning with () (bash functions) */
! 454: if ((cp = strchr(*ep, '=')) != NULL) {
! 455: if (strncmp(cp, "=() ", 3) == 0)
! 456: continue;
! 457: }
! 458:
! 459: /*
! 460: * First check certain variables for '%' and '/' characters.
! 461: * If no match there, check the keep list.
! 462: * If nothing matched, we remove it from the environment.
! 463: */
! 464: keepit = matches_env_check(*ep);
! 465: if (keepit == -1)
! 466: keepit = matches_env_keep(*ep);
! 467:
! 468: /* For SUDO_PS1 -> PS1 conversion. */
! 469: if (strncmp(*ep, "SUDO_PS1=", 8) == 0)
! 470: ps1 = *ep + 5;
! 471:
! 472: if (keepit) {
! 473: /* Preserve variable. */
! 474: switch (**ep) {
! 475: case 'H':
! 476: if (strncmp(*ep, "HOME=", 5) == 0)
! 477: SET(didvar, DID_HOME);
! 478: break;
! 479: case 'L':
! 480: if (strncmp(*ep, "LOGNAME=", 8) == 0)
! 481: SET(didvar, DID_LOGNAME);
! 482: break;
! 483: case 'M':
! 484: if (strncmp(*ep, "MAIL=", 5) == 0)
! 485: SET(didvar, DID_MAIL);
! 486: break;
! 487: case 'P':
! 488: if (strncmp(*ep, "PATH=", 5) == 0)
! 489: SET(didvar, DID_PATH);
! 490: break;
! 491: case 'S':
! 492: if (strncmp(*ep, "SHELL=", 6) == 0)
! 493: SET(didvar, DID_SHELL);
! 494: break;
! 495: case 'T':
! 496: if (strncmp(*ep, "TERM=", 5) == 0)
! 497: SET(didvar, DID_TERM);
! 498: break;
! 499: case 'U':
! 500: if (strncmp(*ep, "USER=", 5) == 0)
! 501: SET(didvar, DID_USER);
! 502: if (strncmp(*ep, "USERNAME=", 5) == 0)
! 503: SET(didvar, DID_USERNAME);
! 504: break;
! 505: }
! 506: sudo_putenv(*ep, FALSE, FALSE);
! 507: }
! 508: }
! 509: didvar |= didvar << 8; /* convert DID_* to KEPT_* */
! 510:
! 511: /*
! 512: * Add in defaults. In -i mode these come from the runas user,
! 513: * otherwise they may be from the user's environment (depends
! 514: * on sudoers options).
! 515: */
! 516: if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
! 517: sudo_setenv("SHELL", runas_pw->pw_shell, ISSET(didvar, DID_SHELL));
! 518: sudo_setenv("LOGNAME", runas_pw->pw_name,
! 519: ISSET(didvar, DID_LOGNAME));
! 520: sudo_setenv("USER", runas_pw->pw_name, ISSET(didvar, DID_USER));
! 521: sudo_setenv("USERNAME", runas_pw->pw_name,
! 522: ISSET(didvar, DID_USERNAME));
! 523: } else {
! 524: if (!ISSET(didvar, DID_SHELL))
! 525: sudo_setenv("SHELL", sudo_user.pw->pw_shell, FALSE);
! 526: if (!ISSET(didvar, DID_LOGNAME))
! 527: sudo_setenv("LOGNAME", user_name, FALSE);
! 528: if (!ISSET(didvar, DID_USER))
! 529: sudo_setenv("USER", user_name, FALSE);
! 530: if (!ISSET(didvar, DID_USERNAME))
! 531: sudo_setenv("USERNAME", user_name, FALSE);
! 532: }
! 533:
! 534: /* If we didn't keep HOME, reset it based on target user. */
! 535: if (!ISSET(didvar, KEPT_HOME))
! 536: reset_home = TRUE;
! 537:
! 538: /*
! 539: * Set MAIL to target user in -i mode or if MAIL is not preserved
! 540: * from user's environment.
! 541: */
! 542: if (ISSET(sudo_mode, MODE_LOGIN_SHELL) || !ISSET(didvar, KEPT_MAIL)) {
! 543: cp = _PATH_MAILDIR;
! 544: if (cp[sizeof(_PATH_MAILDIR) - 2] == '/')
! 545: easprintf(&cp, "MAIL=%s%s", _PATH_MAILDIR, runas_pw->pw_name);
! 546: else
! 547: easprintf(&cp, "MAIL=%s/%s", _PATH_MAILDIR, runas_pw->pw_name);
! 548: sudo_putenv(cp, ISSET(didvar, DID_MAIL), TRUE);
! 549: }
! 550: } else {
! 551: /*
! 552: * Copy environ entries as long as they don't match env_delete or
! 553: * env_check.
! 554: */
! 555: for (ep = old_envp; *ep; ep++) {
! 556: int okvar;
! 557:
! 558: /* Skip variables with values beginning with () (bash functions) */
! 559: if ((cp = strchr(*ep, '=')) != NULL) {
! 560: if (strncmp(cp, "=() ", 3) == 0)
! 561: continue;
! 562: }
! 563:
! 564: /*
! 565: * First check variables against the blacklist in env_delete.
! 566: * If no match there check for '%' and '/' characters.
! 567: */
! 568: okvar = matches_env_delete(*ep) != TRUE;
! 569: if (okvar)
! 570: okvar = matches_env_check(*ep) != FALSE;
! 571:
! 572: if (okvar) {
! 573: if (strncmp(*ep, "SUDO_PS1=", 9) == 0)
! 574: ps1 = *ep + 5;
! 575: else if (strncmp(*ep, "PATH=", 5) == 0)
! 576: SET(didvar, DID_PATH);
! 577: else if (strncmp(*ep, "TERM=", 5) == 0)
! 578: SET(didvar, DID_TERM);
! 579: sudo_putenv(*ep, FALSE, FALSE);
! 580: }
! 581: }
! 582: }
! 583: /* Replace the PATH envariable with a secure one? */
! 584: if (def_secure_path && !user_is_exempt()) {
! 585: sudo_setenv("PATH", def_secure_path, TRUE);
! 586: SET(didvar, DID_PATH);
! 587: }
! 588:
! 589: /*
! 590: * Set $USER, $LOGNAME and $USERNAME to target if "set_logname" is not
! 591: * disabled. We skip this if we are running a login shell (because
! 592: * they have already been set them) or sudoedit (because we want the
! 593: * editor to find the user's startup files).
! 594: */
! 595: if (def_set_logname && !ISSET(sudo_mode, MODE_LOGIN_SHELL|MODE_EDIT)) {
! 596: if (!ISSET(didvar, KEPT_LOGNAME))
! 597: sudo_setenv("LOGNAME", runas_pw->pw_name, TRUE);
! 598: if (!ISSET(didvar, KEPT_USER))
! 599: sudo_setenv("USER", runas_pw->pw_name, TRUE);
! 600: if (!ISSET(didvar, KEPT_USERNAME))
! 601: sudo_setenv("USERNAME", runas_pw->pw_name, TRUE);
! 602: }
! 603:
! 604: /* Set $HOME to target user if not preserving user's value. */
! 605: if (reset_home)
! 606: sudo_setenv("HOME", runas_pw->pw_dir, TRUE);
! 607:
! 608: /* Provide default values for $TERM and $PATH if they are not set. */
! 609: if (!ISSET(didvar, DID_TERM))
! 610: sudo_putenv("TERM=unknown", FALSE, FALSE);
! 611: if (!ISSET(didvar, DID_PATH))
! 612: sudo_setenv("PATH", _PATH_STDPATH, FALSE);
! 613:
! 614: /* Set PS1 if SUDO_PS1 is set. */
! 615: if (ps1 != NULL)
! 616: sudo_putenv(ps1, TRUE, TRUE);
! 617:
! 618: /* Add the SUDO_COMMAND envariable (cmnd + args). */
! 619: if (user_args) {
! 620: easprintf(&cp, "%s %s", user_cmnd, user_args);
! 621: sudo_setenv("SUDO_COMMAND", cp, TRUE);
! 622: efree(cp);
! 623: } else {
! 624: sudo_setenv("SUDO_COMMAND", user_cmnd, TRUE);
! 625: }
! 626:
! 627: /* Add the SUDO_USER, SUDO_UID, SUDO_GID environment variables. */
! 628: sudo_setenv("SUDO_USER", user_name, TRUE);
! 629: snprintf(idbuf, sizeof(idbuf), "%u", (unsigned int) user_uid);
! 630: sudo_setenv("SUDO_UID", idbuf, TRUE);
! 631: snprintf(idbuf, sizeof(idbuf), "%u", (unsigned int) user_gid);
! 632: sudo_setenv("SUDO_GID", idbuf, TRUE);
! 633:
! 634: /* Free old environment. */
! 635: efree(old_envp);
! 636: }
! 637:
! 638: void
! 639: insert_env_vars(char * const envp[])
! 640: {
! 641: char * const *ep;
! 642:
! 643: if (envp == NULL)
! 644: return;
! 645:
! 646: /* Add user-specified environment variables. */
! 647: for (ep = envp; *ep != NULL; ep++)
! 648: sudo_putenv(*ep, TRUE, TRUE);
! 649: }
! 650:
! 651: /*
! 652: * Validate the list of environment variables passed in on the command
! 653: * line against env_delete, env_check, and env_keep.
! 654: * Calls log_error() if any specified variables are not allowed.
! 655: */
! 656: void
! 657: validate_env_vars(char * const env_vars[])
! 658: {
! 659: char * const *ep;
! 660: char *eq, *bad = NULL;
! 661: size_t len, blen = 0, bsize = 0;
! 662: int okvar;
! 663:
! 664: if (env_vars == NULL)
! 665: return;
! 666:
! 667: /* Add user-specified environment variables. */
! 668: for (ep = env_vars; *ep != NULL; ep++) {
! 669: if (def_secure_path && !user_is_exempt() &&
! 670: strncmp(*ep, "PATH=", 5) == 0) {
! 671: okvar = FALSE;
! 672: } else if (def_env_reset) {
! 673: okvar = matches_env_check(*ep);
! 674: if (okvar == -1)
! 675: okvar = matches_env_keep(*ep);
! 676: } else {
! 677: okvar = matches_env_delete(*ep) == FALSE;
! 678: if (okvar == FALSE)
! 679: okvar = matches_env_check(*ep) != FALSE;
! 680: }
! 681: if (okvar == FALSE) {
! 682: /* Not allowed, add to error string, allocating as needed. */
! 683: if ((eq = strchr(*ep, '=')) != NULL)
! 684: *eq = '\0';
! 685: len = strlen(*ep) + 2;
! 686: if (blen + len >= bsize) {
! 687: do {
! 688: bsize += 1024;
! 689: } while (blen + len >= bsize);
! 690: bad = erealloc(bad, bsize);
! 691: bad[blen] = '\0';
! 692: }
! 693: strlcat(bad, *ep, bsize);
! 694: strlcat(bad, ", ", bsize);
! 695: blen += len;
! 696: if (eq != NULL)
! 697: *eq = '=';
! 698: }
! 699: }
! 700: if (bad != NULL) {
! 701: bad[blen - 2] = '\0'; /* remove trailing ", " */
! 702: log_error(NO_MAIL,
! 703: _("sorry, you are not allowed to set the following environment variables: %s"), bad);
! 704: /* NOTREACHED */
! 705: efree(bad);
! 706: }
! 707: }
! 708:
! 709: /*
! 710: * Read in /etc/environment ala AIX and Linux.
! 711: * Lines may be in either of three formats:
! 712: * NAME=VALUE
! 713: * NAME="VALUE"
! 714: * NAME='VALUE'
! 715: * with an optional "export" prefix so the shell can source the file.
! 716: * Invalid lines, blank lines, or lines consisting solely of a comment
! 717: * character are skipped.
! 718: */
! 719: void
! 720: read_env_file(const char *path, int overwrite)
! 721: {
! 722: FILE *fp;
! 723: char *cp, *var, *val;
! 724: size_t var_len, val_len;
! 725:
! 726: if ((fp = fopen(path, "r")) == NULL)
! 727: return;
! 728:
! 729: while ((var = sudo_parseln(fp)) != NULL) {
! 730: /* Skip blank or comment lines */
! 731: if (*var == '\0')
! 732: continue;
! 733:
! 734: /* Skip optional "export " */
! 735: if (strncmp(var, "export", 6) == 0 && isspace((unsigned char) var[6])) {
! 736: var += 7;
! 737: while (isspace((unsigned char) *var)) {
! 738: var++;
! 739: }
! 740: }
! 741:
! 742: /* Must be of the form name=["']value['"] */
! 743: for (val = var; *val != '\0' && *val != '='; val++)
! 744: ;
! 745: if (var == val || *val != '=')
! 746: continue;
! 747: var_len = (size_t)(val - var);
! 748: val_len = strlen(++val);
! 749:
! 750: /* Strip leading and trailing single/double quotes */
! 751: if ((val[0] == '\'' || val[0] == '\"') && val[0] == val[val_len - 1]) {
! 752: val[val_len - 1] = '\0';
! 753: val++;
! 754: val_len -= 2;
! 755: }
! 756:
! 757: cp = emalloc(var_len + 1 + val_len + 1);
! 758: memcpy(cp, var, var_len + 1); /* includes '=' */
! 759: memcpy(cp + var_len + 1, val, val_len + 1); /* includes NUL */
! 760:
! 761: sudo_putenv(cp, TRUE, overwrite);
! 762: }
! 763: fclose(fp);
! 764: }
! 765:
! 766: void
! 767: init_envtables(void)
! 768: {
! 769: struct list_member *cur;
! 770: const char **p;
! 771:
! 772: /* Fill in the "env_delete" list. */
! 773: for (p = initial_badenv_table; *p; p++) {
! 774: cur = emalloc(sizeof(struct list_member));
! 775: cur->value = estrdup(*p);
! 776: cur->next = def_env_delete;
! 777: def_env_delete = cur;
! 778: }
! 779:
! 780: /* Fill in the "env_check" list. */
! 781: for (p = initial_checkenv_table; *p; p++) {
! 782: cur = emalloc(sizeof(struct list_member));
! 783: cur->value = estrdup(*p);
! 784: cur->next = def_env_check;
! 785: def_env_check = cur;
! 786: }
! 787:
! 788: /* Fill in the "env_keep" list. */
! 789: for (p = initial_keepenv_table; *p; p++) {
! 790: cur = emalloc(sizeof(struct list_member));
! 791: cur->value = estrdup(*p);
! 792: cur->next = def_env_keep;
! 793: def_env_keep = cur;
! 794: }
! 795: }
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