Annotation of src/usr.bin/sudo/env.c, Revision 1.15
1.1 millert 1: /*
1.14 millert 2: * Copyright (c) 2000-2007 Todd C. Miller <Todd.Miller@courtesan.com>
1.1 millert 3: *
1.9 millert 4: * Permission to use, copy, modify, and distribute this software for any
5: * purpose with or without fee is hereby granted, provided that the above
6: * copyright notice and this permission notice appear in all copies.
1.1 millert 7: *
1.9 millert 8: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.7 millert 15: *
16: * Sponsored in part by the Defense Advanced Research Projects
17: * Agency (DARPA) and Air Force Research Laboratory, Air Force
18: * Materiel Command, USAF, under agreement number F39502-99-1-0512.
1.1 millert 19: */
20:
1.14 millert 21: #include <config.h>
1.1 millert 22:
23: #include <sys/types.h>
24: #include <sys/param.h>
25: #include <sys/stat.h>
26: #include <stdio.h>
27: #ifdef STDC_HEADERS
28: # include <stdlib.h>
29: # include <stddef.h>
30: #else
31: # ifdef HAVE_STDLIB_H
32: # include <stdlib.h>
33: # endif
34: #endif /* STDC_HEADERS */
35: #ifdef HAVE_STRING_H
36: # include <string.h>
37: #else
38: # ifdef HAVE_STRINGS_H
39: # include <strings.h>
40: # endif
41: #endif /* HAVE_STRING_H */
42: #ifdef HAVE_UNISTD_H
43: # include <unistd.h>
44: #endif /* HAVE_UNISTD_H */
1.6 millert 45: #ifdef HAVE_ERR_H
46: # include <err.h>
47: #else
48: # include "emul/err.h"
49: #endif /* HAVE_ERR_H */
1.1 millert 50: #include <pwd.h>
51:
52: #include "sudo.h"
53:
54: #ifndef lint
1.15 ! millert 55: __unused static const char rcsid[] = "$Sudo: env.c,v 1.39.2.16 2007/07/29 20:10:19 millert Exp $";
1.1 millert 56: #endif /* lint */
57:
58: /*
1.5 millert 59: * Flags used in rebuild_env()
1.1 millert 60: */
61: #undef DID_TERM
1.14 millert 62: #define DID_TERM 0x0001
1.1 millert 63: #undef DID_PATH
1.14 millert 64: #define DID_PATH 0x0002
1.1 millert 65: #undef DID_HOME
1.14 millert 66: #define DID_HOME 0x0004
1.1 millert 67: #undef DID_SHELL
1.14 millert 68: #define DID_SHELL 0x0008
1.1 millert 69: #undef DID_LOGNAME
1.14 millert 70: #define DID_LOGNAME 0x0010
1.9 millert 71: #undef DID_USER
1.14 millert 72: #define DID_USER 0x0020
73: #undef DID_USERNAME
74: #define DID_USERNAME 0x0040
75: #undef DID_MAX
76: #define DID_MAX 0x00ff
77:
78: #undef KEPT_TERM
79: #define KEPT_TERM 0x0100
80: #undef KEPT_PATH
81: #define KEPT_PATH 0x0200
82: #undef KEPT_HOME
83: #define KEPT_HOME 0x0400
84: #undef KEPT_SHELL
85: #define KEPT_SHELL 0x0800
86: #undef KEPT_LOGNAME
87: #define KEPT_LOGNAME 0x1000
88: #undef KEPT_USER
89: #define KEPT_USER 0x2000
90: #undef KEPT_USERNAME
91: #define KEPT_USERNAME 0x4000
92: #undef KEPT_MAX
93: #define KEPT_MAX 0xff00
1.1 millert 94:
1.9 millert 95: #undef VNULL
96: #define VNULL (VOID *)NULL
97:
1.14 millert 98: struct environment {
99: char **envp; /* pointer to the new environment */
100: size_t env_size; /* size of new_environ in char **'s */
101: size_t env_len; /* number of slots used, not counting NULL */
102: };
103:
1.1 millert 104: /*
105: * Prototypes
106: */
1.9 millert 107: char **rebuild_env __P((char **, int, int));
1.14 millert 108: static void insert_env __P((char *, struct environment *, int));
1.9 millert 109: static char *format_env __P((char *, ...));
1.1 millert 110:
111: /*
1.14 millert 112: * Copy of the sudo-managed environment.
113: */
114: static struct environment env;
115:
116: /*
1.1 millert 117: * Default table of "bad" variables to remove from the environment.
118: * XXX - how to omit TERMCAP if it starts with '/'?
119: */
1.5 millert 120: static const char *initial_badenv_table[] = {
1.1 millert 121: "IFS",
1.11 millert 122: "CDPATH",
1.1 millert 123: "LOCALDOMAIN",
124: "RES_OPTIONS",
125: "HOSTALIASES",
126: "NLSPATH",
127: "PATH_LOCALE",
128: "LD_*",
129: "_RLD*",
130: #ifdef __hpux
131: "SHLIB_PATH",
132: #endif /* __hpux */
133: #ifdef _AIX
1.14 millert 134: "LDR_*",
1.1 millert 135: "LIBPATH",
1.14 millert 136: #endif
1.5 millert 137: #ifdef __APPLE__
138: "DYLD_*",
139: #endif
1.1 millert 140: #ifdef HAVE_KERB4
141: "KRB_CONF*",
1.6 millert 142: "KRBCONFDIR",
1.1 millert 143: "KRBTKFILE",
144: #endif /* HAVE_KERB4 */
145: #ifdef HAVE_KERB5
146: "KRB5_CONFIG*",
1.14 millert 147: "KRB5_KTNAME",
1.1 millert 148: #endif /* HAVE_KERB5 */
149: #ifdef HAVE_SECURID
150: "VAR_ACE",
151: "USR_ACE",
152: "DLC_ACE",
153: #endif /* HAVE_SECURID */
1.14 millert 154: "TERMINFO", /* terminfo, exclusive path to terminfo files */
155: "TERMINFO_DIRS", /* terminfo, path(s) to terminfo files */
156: "TERMPATH", /* termcap, path(s) to termcap files */
1.1 millert 157: "TERMCAP", /* XXX - only if it starts with '/' */
1.14 millert 158: "ENV", /* ksh, file to source before script runs */
159: "BASH_ENV", /* bash, file to source before script runs */
160: "PS4", /* bash, prefix for lines in xtrace mode */
161: "GLOBIGNORE", /* bash, globbing patterns to ignore */
162: "SHELLOPTS", /* bash, extra command line options */
163: "JAVA_TOOL_OPTIONS", /* java, extra command line options */
164: "PERLIO_DEBUG ", /* perl, debugging output file */
165: "PERLLIB", /* perl, search path for modules/includes */
166: "PERL5LIB", /* perl 5, search path for modules/includes */
167: "PERL5OPT", /* perl 5, extra command line options */
168: "PERL5DB", /* perl 5, command used to load debugger */
169: "FPATH", /* ksh, search path for functions */
170: "NULLCMD", /* zsh, command for null file redirection */
171: "READNULLCMD", /* zsh, command for null file redirection */
172: "ZDOTDIR", /* zsh, search path for dot files */
173: "TMPPREFIX", /* zsh, prefix for temporary files */
174: "PYTHONHOME", /* python, module search path */
175: "PYTHONPATH", /* python, search path */
176: "PYTHONINSPEC", /* python, allow inspection */
177: "RUBYLIB", /* ruby, library load path */
178: "RUBYOPT", /* ruby, extra command line options */
1.1 millert 179: NULL
180: };
181:
182: /*
183: * Default table of variables to check for '%' and '/' characters.
184: */
1.5 millert 185: static const char *initial_checkenv_table[] = {
1.14 millert 186: "COLORTERM",
1.1 millert 187: "LANG",
188: "LANGUAGE",
1.14 millert 189: "LC_*",
190: "LINGUAS",
191: "TERM",
1.1 millert 192: NULL
193: };
194:
195: /*
1.14 millert 196: * Default table of variables to preserve in the environment.
1.1 millert 197: */
1.14 millert 198: static const char *initial_keepenv_table[] = {
199: "COLORS",
200: "DISPLAY",
201: "HOSTNAME",
202: "KRB5CCNAME",
203: "LS_COLORS",
204: "MAIL",
205: "PATH",
206: "PS1",
207: "PS2",
208: "TZ",
209: "XAUTHORITY",
210: "XAUTHORIZATION",
211: NULL
212: };
1.1 millert 213:
214: /*
215: * Given a variable and value, allocate and format an environment string.
216: */
217: static char *
1.9 millert 218: #ifdef __STDC__
219: format_env(char *var, ...)
220: #else
221: format_env(var, va_alist)
1.1 millert 222: char *var;
1.9 millert 223: va_dcl
224: #endif
1.1 millert 225: {
1.5 millert 226: char *estring;
1.9 millert 227: char *val;
1.5 millert 228: size_t esize;
1.9 millert 229: va_list ap;
1.1 millert 230:
1.9 millert 231: #ifdef __STDC__
232: va_start(ap, var);
233: #else
234: va_start(ap);
235: #endif
236: esize = strlen(var) + 2;
237: while ((val = va_arg(ap, char *)) != NULL)
238: esize += strlen(val);
239: va_end(ap);
1.5 millert 240: estring = (char *) emalloc(esize);
241:
1.9 millert 242: /* Store variable name and the '=' separator. */
1.5 millert 243: if (strlcpy(estring, var, esize) >= esize ||
1.9 millert 244: strlcat(estring, "=", esize) >= esize) {
1.6 millert 245:
246: errx(1, "internal error, format_env() overflow");
1.5 millert 247: }
1.1 millert 248:
1.9 millert 249: /* Now store the variable's value (if any) */
250: #ifdef __STDC__
251: va_start(ap, var);
252: #else
253: va_start(ap);
254: #endif
255: while ((val = va_arg(ap, char *)) != NULL) {
256: if (strlcat(estring, val, esize) >= esize)
257: errx(1, "internal error, format_env() overflow");
258: }
259: va_end(ap);
260:
1.1 millert 261: return(estring);
262: }
263:
264: /*
1.14 millert 265: * Insert str into e->envp, assumes str has an '=' in it.
1.1 millert 266: */
267: static void
1.14 millert 268: insert_env(str, e, dupcheck)
1.1 millert 269: char *str;
1.14 millert 270: struct environment *e;
1.5 millert 271: int dupcheck;
1.1 millert 272: {
1.5 millert 273: char **nep;
1.1 millert 274: size_t varlen;
275:
1.8 millert 276: /* Make sure there is room for the new entry plus a NULL. */
1.14 millert 277: if (e->env_len + 2 > e->env_size) {
278: e->env_size += 128;
279: e->envp = erealloc3(e->envp, e->env_size, sizeof(char *));
1.5 millert 280: }
281:
282: if (dupcheck) {
283: varlen = (strchr(str, '=') - str) + 1;
1.1 millert 284:
1.14 millert 285: for (nep = e->envp; *nep; nep++) {
1.5 millert 286: if (strncmp(str, *nep, varlen) == 0) {
287: *nep = str;
288: return;
289: }
290: }
291: } else
1.14 millert 292: nep = e->envp + e->env_len;
1.5 millert 293:
1.14 millert 294: e->env_len++;
1.5 millert 295: *nep++ = str;
296: *nep = NULL;
1.1 millert 297: }
298:
299: /*
1.14 millert 300: * Check the env_delete blacklist.
301: * Returns TRUE if the variable was found, else false.
302: */
303: static int
304: matches_env_delete(var)
305: const char *var;
306: {
307: struct list_member *cur;
308: size_t len;
309: int iswild, match = FALSE;
310:
311: /* Skip anything listed in env_delete. */
312: for (cur = def_env_delete; cur; cur = cur->next) {
313: len = strlen(cur->value);
314: /* Deal with '*' wildcard */
315: if (cur->value[len - 1] == '*') {
316: len--;
317: iswild = TRUE;
318: } else
319: iswild = FALSE;
320: if (strncmp(cur->value, var, len) == 0 &&
321: (iswild || var[len] == '=')) {
322: match = TRUE;
323: break;
324: }
325: }
326: return(match);
327: }
328:
329: /*
330: * Apply the env_check list.
331: * Returns TRUE if the variable is allowed, FALSE if denied
332: * or -1 if no match.
333: */
334: static int
335: matches_env_check(var)
336: const char *var;
337: {
338: struct list_member *cur;
339: size_t len;
340: int iswild, keepit = -1;
341:
342: for (cur = def_env_check; cur; cur = cur->next) {
343: len = strlen(cur->value);
344: /* Deal with '*' wildcard */
345: if (cur->value[len - 1] == '*') {
346: len--;
347: iswild = TRUE;
348: } else
349: iswild = FALSE;
350: if (strncmp(cur->value, var, len) == 0 &&
351: (iswild || var[len] == '=')) {
352: keepit = !strpbrk(var, "/%");
353: break;
354: }
355: }
356: return(keepit);
357: }
358:
359: /*
360: * Check the env_keep list.
361: * Returns TRUE if the variable is allowed else FALSE.
362: */
363: static int
364: matches_env_keep(var)
365: const char *var;
366: {
367: struct list_member *cur;
368: size_t len;
369: int iswild, keepit = FALSE;
370:
371: for (cur = def_env_keep; cur; cur = cur->next) {
372: len = strlen(cur->value);
373: /* Deal with '*' wildcard */
374: if (cur->value[len - 1] == '*') {
375: len--;
376: iswild = TRUE;
377: } else
378: iswild = FALSE;
379: if (strncmp(cur->value, var, len) == 0 &&
380: (iswild || var[len] == '=')) {
381: keepit = TRUE;
382: break;
383: }
384: }
385: return(keepit);
386: }
387:
388: /*
1.1 millert 389: * Build a new environment and ether clear potentially dangerous
390: * variables from the old one or start with a clean slate.
391: * Also adds sudo-specific variables (SUDO_*).
392: */
393: char **
1.9 millert 394: rebuild_env(envp, sudo_mode, noexec)
395: char **envp;
1.1 millert 396: int sudo_mode;
1.9 millert 397: int noexec;
1.1 millert 398: {
1.5 millert 399: char **ep, *cp, *ps1;
1.14 millert 400: unsigned int didvar;
1.1 millert 401:
402: /*
403: * Either clean out the environment or reset to a safe default.
404: */
405: ps1 = NULL;
406: didvar = 0;
1.14 millert 407: memset(&env, 0, sizeof(env));
1.9 millert 408: if (def_env_reset) {
1.1 millert 409: /* Pull in vars we want to keep from the old environment. */
410: for (ep = envp; *ep; ep++) {
1.14 millert 411: int keepit;
1.10 millert 412:
413: /* Skip variables with values beginning with () (bash functions) */
414: if ((cp = strchr(*ep, '=')) != NULL) {
415: if (strncmp(cp, "=() ", 3) == 0)
416: continue;
417: }
418:
1.14 millert 419: /*
420: * First check certain variables for '%' and '/' characters.
421: * If no match there, check the keep list.
422: * If nothing matched, we remove it from the environment.
423: */
424: keepit = matches_env_check(*ep);
425: if (keepit == -1)
426: keepit = matches_env_keep(*ep);
1.1 millert 427:
428: /* For SUDO_PS1 -> PS1 conversion. */
429: if (strncmp(*ep, "SUDO_PS1=", 8) == 0)
430: ps1 = *ep + 5;
431:
432: if (keepit) {
433: /* Preserve variable. */
434: switch (**ep) {
435: case 'H':
436: if (strncmp(*ep, "HOME=", 5) == 0)
1.9 millert 437: SET(didvar, DID_HOME);
1.5 millert 438: break;
1.14 millert 439: case 'L':
440: if (strncmp(*ep, "LOGNAME=", 8) == 0)
441: SET(didvar, DID_LOGNAME);
442: break;
443: case 'P':
444: if (strncmp(*ep, "PATH=", 5) == 0)
445: SET(didvar, DID_PATH);
446: break;
1.1 millert 447: case 'S':
448: if (strncmp(*ep, "SHELL=", 6) == 0)
1.9 millert 449: SET(didvar, DID_SHELL);
1.5 millert 450: break;
1.14 millert 451: case 'T':
452: if (strncmp(*ep, "TERM=", 5) == 0)
453: SET(didvar, DID_TERM);
1.5 millert 454: break;
1.1 millert 455: case 'U':
456: if (strncmp(*ep, "USER=", 5) == 0)
1.9 millert 457: SET(didvar, DID_USER);
1.14 millert 458: if (strncmp(*ep, "USERNAME=", 5) == 0)
459: SET(didvar, DID_USERNAME);
1.5 millert 460: break;
1.1 millert 461: }
1.14 millert 462: insert_env(*ep, &env, 0);
1.1 millert 463: }
464: }
1.14 millert 465: didvar |= didvar << 8; /* convert DID_* to KEPT_* */
1.1 millert 466:
467: /*
1.9 millert 468: * Add in defaults. In -i mode these come from the runas user,
469: * otherwise they may be from the user's environment (depends
470: * on sudoers options).
1.1 millert 471: */
1.9 millert 472: if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
1.14 millert 473: insert_env(format_env("HOME", runas_pw->pw_dir, VNULL), &env,
474: ISSET(didvar, DID_HOME));
475: insert_env(format_env("SHELL", runas_pw->pw_shell, VNULL), &env,
476: ISSET(didvar, DID_SHELL));
477: insert_env(format_env("LOGNAME", runas_pw->pw_name, VNULL), &env,
478: ISSET(didvar, DID_LOGNAME));
479: insert_env(format_env("USER", runas_pw->pw_name, VNULL), &env,
480: ISSET(didvar, DID_USER));
481: insert_env(format_env("USERNAME", runas_pw->pw_name, VNULL), &env,
482: ISSET(didvar, DID_USERNAME));
1.9 millert 483: } else {
484: if (!ISSET(didvar, DID_HOME))
1.14 millert 485: insert_env(format_env("HOME", user_dir, VNULL), &env, 0);
1.9 millert 486: if (!ISSET(didvar, DID_SHELL))
1.14 millert 487: insert_env(format_env("SHELL", sudo_user.pw->pw_shell, VNULL),
488: &env, 0);
1.9 millert 489: if (!ISSET(didvar, DID_LOGNAME))
1.14 millert 490: insert_env(format_env("LOGNAME", user_name, VNULL), &env, 0);
1.9 millert 491: if (!ISSET(didvar, DID_USER))
1.14 millert 492: insert_env(format_env("USER", user_name, VNULL), &env, 0);
493: if (!ISSET(didvar, DID_USERNAME))
494: insert_env(format_env("USERNAME", user_name, VNULL), &env, 0);
1.9 millert 495: }
1.1 millert 496: } else {
497: /*
498: * Copy envp entries as long as they don't match env_delete or
499: * env_check.
500: */
501: for (ep = envp; *ep; ep++) {
1.14 millert 502: int okvar;
1.10 millert 503:
504: /* Skip variables with values beginning with () (bash functions) */
505: if ((cp = strchr(*ep, '=')) != NULL) {
506: if (strncmp(cp, "=() ", 3) == 0)
507: continue;
508: }
1.1 millert 509:
1.14 millert 510: /*
511: * First check variables against the blacklist in env_delete.
512: * If no match there check for '%' and '/' characters.
513: */
514: okvar = matches_env_delete(*ep) != TRUE;
515: if (okvar)
516: okvar = matches_env_check(*ep) != FALSE;
1.1 millert 517:
518: if (okvar) {
519: if (strncmp(*ep, "SUDO_PS1=", 9) == 0)
520: ps1 = *ep + 5;
521: else if (strncmp(*ep, "PATH=", 5) == 0)
1.9 millert 522: SET(didvar, DID_PATH);
1.1 millert 523: else if (strncmp(*ep, "TERM=", 5) == 0)
1.9 millert 524: SET(didvar, DID_TERM);
1.14 millert 525: insert_env(*ep, &env, 0);
1.1 millert 526: }
527: }
528: }
529:
530: #ifdef SECURE_PATH
531: /* Replace the PATH envariable with a secure one. */
1.14 millert 532: if (!user_is_exempt()) {
533: insert_env(format_env("PATH", SECURE_PATH, VNULL), &env, 1);
534: SET(didvar, DID_PATH);
535: }
1.1 millert 536: #endif
537:
1.14 millert 538: /* Set $USER, $LOGNAME and $USERNAME to target if "set_logname" is true. */
1.9 millert 539: if (def_set_logname && runas_pw->pw_name) {
1.14 millert 540: if (!ISSET(didvar, KEPT_LOGNAME))
541: insert_env(format_env("LOGNAME", runas_pw->pw_name, VNULL), &env, 1);
542: if (!ISSET(didvar, KEPT_USER))
543: insert_env(format_env("USER", runas_pw->pw_name, VNULL), &env, 1);
544: if (!ISSET(didvar, KEPT_USERNAME))
545: insert_env(format_env("USERNAME", runas_pw->pw_name, VNULL), &env, 1);
1.1 millert 546: }
547:
1.9 millert 548: /* Set $HOME for `sudo -H'. Only valid at PERM_FULL_RUNAS. */
1.14 millert 549: if (runas_pw->pw_dir) {
550: if (ISSET(sudo_mode, MODE_RESET_HOME) ||
551: (ISSET(sudo_mode, MODE_RUN) && (def_always_set_home ||
552: (ISSET(sudo_mode, MODE_SHELL) && def_set_home))))
553: insert_env(format_env("HOME", runas_pw->pw_dir, VNULL), &env, 1);
554: }
555:
556: /* Provide default values for $TERM and $PATH if they are not set. */
557: if (!ISSET(didvar, DID_TERM))
558: insert_env("TERM=unknown", &env, 0);
559: if (!ISSET(didvar, DID_PATH))
560: insert_env(format_env("PATH", _PATH_DEFPATH, VNULL), &env, 0);
1.9 millert 561:
562: /*
563: * Preload a noexec file? For a list of LD_PRELOAD-alikes, see
564: * http://www.fortran-2000.com/ArnaudRecipes/sharedlib.html
565: * XXX - should prepend to original value, if any
566: */
1.12 millert 567: if (noexec && def_noexec_file != NULL) {
1.9 millert 568: #if defined(__darwin__) || defined(__APPLE__)
1.14 millert 569: insert_env(format_env("DYLD_INSERT_LIBRARIES", def_noexec_file, VNULL),
570: &env, 1);
571: insert_env(format_env("DYLD_FORCE_FLAT_NAMESPACE", VNULL), &env, 1);
1.9 millert 572: #else
573: # if defined(__osf__) || defined(__sgi)
1.14 millert 574: insert_env(format_env("_RLD_LIST", def_noexec_file, ":DEFAULT", VNULL),
575: &env, 1);
1.9 millert 576: # else
1.14 millert 577: # ifdef _AIX
578: insert_env(format_env("LDR_PRELOAD", def_noexec_file, VNULL), &env, 1);
579: # else
580: insert_env(format_env("LD_PRELOAD", def_noexec_file, VNULL), &env, 1);
581: # endif /* _AIX */
582: # endif /* __osf__ || __sgi */
583: #endif /* __darwin__ || __APPLE__ */
1.12 millert 584: }
1.1 millert 585:
586: /* Set PS1 if SUDO_PS1 is set. */
587: if (ps1)
1.14 millert 588: insert_env(ps1, &env, 1);
1.1 millert 589:
590: /* Add the SUDO_COMMAND envariable (cmnd + args). */
1.9 millert 591: if (user_args)
1.14 millert 592: insert_env(format_env("SUDO_COMMAND", user_cmnd, " ", user_args, VNULL),
593: &env, 1);
1.9 millert 594: else
1.14 millert 595: insert_env(format_env("SUDO_COMMAND", user_cmnd, VNULL), &env, 1);
1.1 millert 596:
597: /* Add the SUDO_USER, SUDO_UID, SUDO_GID environment variables. */
1.14 millert 598: insert_env(format_env("SUDO_USER", user_name, VNULL), &env, 1);
1.5 millert 599: easprintf(&cp, "SUDO_UID=%lu", (unsigned long) user_uid);
1.14 millert 600: insert_env(cp, &env, 1);
1.5 millert 601: easprintf(&cp, "SUDO_GID=%lu", (unsigned long) user_gid);
1.14 millert 602: insert_env(cp, &env, 1);
603:
604: return(env.envp);
605: }
606:
607: char **
608: insert_env_vars(envp, env_vars)
609: char **envp;
610: struct list_member *env_vars;
611: {
612: struct list_member *cur;
613:
614: if (env_vars == NULL)
615: return (envp);
616:
617: /*
618: * Make sure we still own the environment and steal it back if not.
619: */
620: if (env.envp != envp) {
621: size_t evlen;
622: char **ep;
623:
624: for (ep = envp; *ep != NULL; ep++)
625: continue;
626: evlen = ep - envp;
627: if (evlen + 1 > env.env_size) {
628: efree(env.envp);
629: env.env_size = evlen + 1 + 128;
630: env.envp = emalloc2(env.env_size, sizeof(char *));
631: }
1.15 ! millert 632: memcpy(env.envp, envp, (evlen + 1) * sizeof(char *));
1.14 millert 633: env.env_len = evlen;
634: }
635:
636: /* Add user-specified environment variables. */
637: for (cur = env_vars; cur != NULL; cur = cur->next)
638: insert_env(cur->value, &env, 1);
639:
640: return(env.envp);
641: }
642:
643: /*
644: * Validate the list of environment variables passed in on the command
645: * line against env_delete, env_check, and env_keep.
646: * Calls log_error() if any specified variables are not allowed.
647: */
648: void
649: validate_env_vars(env_vars)
650: struct list_member *env_vars;
651: {
652: struct list_member *var;
653: char *eq, *bad = NULL;
654: size_t len, blen = 0, bsize = 0;
655: int okvar;
1.1 millert 656:
1.14 millert 657: for (var = env_vars; var != NULL; var = var->next) {
658: #ifdef SECURE_PATH
659: if (!user_is_exempt() && strncmp(var->value, "PATH=", 5) == 0) {
660: okvar = FALSE;
661: } else
662: #endif
663: if (def_env_reset) {
664: okvar = matches_env_check(var->value);
665: if (okvar == -1)
666: okvar = matches_env_keep(var->value);
667: } else {
668: okvar = matches_env_delete(var->value) == FALSE;
669: if (okvar == FALSE)
670: okvar = matches_env_check(var->value) != FALSE;
671: }
672: if (okvar == FALSE) {
673: /* Not allowed, add to error string, allocating as needed. */
674: if ((eq = strchr(var->value, '=')) != NULL)
675: *eq = '\0';
676: len = strlen(var->value) + 2;
677: if (blen + len >= bsize) {
678: do {
679: bsize += 1024;
680: } while (blen + len >= bsize);
681: bad = erealloc(bad, bsize);
682: bad[blen] = '\0';
683: }
684: strlcat(bad, var->value, bsize);
685: strlcat(bad, ", ", bsize);
686: blen += len;
687: if (eq != NULL)
688: *eq = '=';
689: }
690: }
691: if (bad != NULL) {
692: bad[blen - 2] = '\0'; /* remove trailing ", " */
693: log_error(NO_MAIL,
694: "sorry, you are not allowed to set the following environment variables: %s", bad);
695: /* NOTREACHED */
696: efree(bad);
697: }
1.1 millert 698: }
699:
700: void
701: init_envtables()
702: {
703: struct list_member *cur;
1.5 millert 704: const char **p;
1.1 millert 705:
1.14 millert 706: /* Fill in the "env_delete" list. */
1.1 millert 707: for (p = initial_badenv_table; *p; p++) {
708: cur = emalloc(sizeof(struct list_member));
709: cur->value = estrdup(*p);
1.9 millert 710: cur->next = def_env_delete;
711: def_env_delete = cur;
1.1 millert 712: }
713:
1.14 millert 714: /* Fill in the "env_check" list. */
1.1 millert 715: for (p = initial_checkenv_table; *p; p++) {
716: cur = emalloc(sizeof(struct list_member));
717: cur->value = estrdup(*p);
1.9 millert 718: cur->next = def_env_check;
719: def_env_check = cur;
1.14 millert 720: }
721:
722: /* Fill in the "env_keep" list. */
723: for (p = initial_keepenv_table; *p; p++) {
724: cur = emalloc(sizeof(struct list_member));
725: cur->value = estrdup(*p);
726: cur->next = def_env_keep;
727: def_env_keep = cur;
1.1 millert 728: }
729: }
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