/* * Copyright (c) 2000-2005, 2007-2011 * Todd C. Miller * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * Sponsored in part by the Defense Advanced Research Projects * Agency (DARPA) and Air Force Research Laboratory, Air Force * Materiel Command, USAF, under agreement number F39502-99-1-0512. */ #include #include #include #include #include #ifdef STDC_HEADERS # include # include #else # ifdef HAVE_STDLIB_H # include # endif #endif /* STDC_HEADERS */ #ifdef HAVE_STRING_H # include #endif /* HAVE_STRING_H */ #ifdef HAVE_STRINGS_H # include #endif /* HAVE_STRINGS_H */ #ifdef HAVE_UNISTD_H # include #endif /* HAVE_UNISTD_H */ #ifdef HAVE_INTTYPES_H # include #endif #ifdef HAVE_LOGIN_CAP_H # include # ifndef LOGIN_SETENV # define LOGIN_SETENV 0 # endif #endif /* HAVE_LOGIN_CAP_H */ #include #include #include #include #include "sudoers.h" /* * If there is no SIZE_MAX or SIZE_T_MAX we have to assume that size_t * could be signed (as it is on SunOS 4.x). This just means that * emalloc2() and erealloc3() cannot allocate huge amounts on such a * platform but that is OK since sudo doesn't need to do so anyway. */ #ifndef SIZE_MAX # ifdef SIZE_T_MAX # define SIZE_MAX SIZE_T_MAX # else # define SIZE_MAX INT_MAX # endif /* SIZE_T_MAX */ #endif /* SIZE_MAX */ /* * Flags used in rebuild_env() */ #undef DID_TERM #define DID_TERM 0x0001 #undef DID_PATH #define DID_PATH 0x0002 #undef DID_HOME #define DID_HOME 0x0004 #undef DID_SHELL #define DID_SHELL 0x0008 #undef DID_LOGNAME #define DID_LOGNAME 0x0010 #undef DID_USER #define DID_USER 0x0020 #undef DID_USERNAME #define DID_USERNAME 0x0040 #undef DID_MAIL #define DID_MAIL 0x0080 #undef DID_MAX #define DID_MAX 0x00ff #undef KEPT_TERM #define KEPT_TERM 0x0100 #undef KEPT_PATH #define KEPT_PATH 0x0200 #undef KEPT_HOME #define KEPT_HOME 0x0400 #undef KEPT_SHELL #define KEPT_SHELL 0x0800 #undef KEPT_LOGNAME #define KEPT_LOGNAME 0x1000 #undef KEPT_USER #define KEPT_USER 0x2000 #undef KEPT_USERNAME #define KEPT_USERNAME 0x4000 #undef KEPT_MAIL #define KEPT_MAIL 0x8000 #undef KEPT_MAX #define KEPT_MAX 0xff00 struct environment { char * const *old_envp; /* pointer the environment we passed back */ char **envp; /* pointer to the new environment */ size_t env_size; /* size of new_environ in char **'s */ size_t env_len; /* number of slots used, not counting NULL */ }; /* * Copy of the sudo-managed environment. */ static struct environment env; /* * Default table of "bad" variables to remove from the environment. * XXX - how to omit TERMCAP if it starts with '/'? */ static const char *initial_badenv_table[] = { "IFS", "CDPATH", "LOCALDOMAIN", "RES_OPTIONS", "HOSTALIASES", "NLSPATH", "PATH_LOCALE", "LD_*", "_RLD*", #ifdef __hpux "SHLIB_PATH", #endif /* __hpux */ #ifdef _AIX "LDR_*", "LIBPATH", "AUTHSTATE", #endif #ifdef __APPLE__ "DYLD_*", #endif #ifdef HAVE_KERB5 "KRB5_CONFIG*", "KRB5_KTNAME", #endif /* HAVE_KERB5 */ #ifdef HAVE_SECURID "VAR_ACE", "USR_ACE", "DLC_ACE", #endif /* HAVE_SECURID */ "TERMINFO", /* terminfo, exclusive path to terminfo files */ "TERMINFO_DIRS", /* terminfo, path(s) to terminfo files */ "TERMPATH", /* termcap, path(s) to termcap files */ "TERMCAP", /* XXX - only if it starts with '/' */ "ENV", /* ksh, file to source before script runs */ "BASH_ENV", /* bash, file to source before script runs */ "PS4", /* bash, prefix for lines in xtrace mode */ "GLOBIGNORE", /* bash, globbing patterns to ignore */ "SHELLOPTS", /* bash, extra command line options */ "JAVA_TOOL_OPTIONS", /* java, extra command line options */ "PERLIO_DEBUG ", /* perl, debugging output file */ "PERLLIB", /* perl, search path for modules/includes */ "PERL5LIB", /* perl 5, search path for modules/includes */ "PERL5OPT", /* perl 5, extra command line options */ "PERL5DB", /* perl 5, command used to load debugger */ "FPATH", /* ksh, search path for functions */ "NULLCMD", /* zsh, command for null file redirection */ "READNULLCMD", /* zsh, command for null file redirection */ "ZDOTDIR", /* zsh, search path for dot files */ "TMPPREFIX", /* zsh, prefix for temporary files */ "PYTHONHOME", /* python, module search path */ "PYTHONPATH", /* python, search path */ "PYTHONINSPECT", /* python, allow inspection */ "PYTHONUSERBASE", /* python, per user site-packages directory */ "RUBYLIB", /* ruby, library load path */ "RUBYOPT", /* ruby, extra command line options */ NULL }; /* * Default table of variables to check for '%' and '/' characters. */ static const char *initial_checkenv_table[] = { "COLORTERM", "LANG", "LANGUAGE", "LC_*", "LINGUAS", "TERM", NULL }; /* * Default table of variables to preserve in the environment. */ static const char *initial_keepenv_table[] = { "COLORS", "DISPLAY", "HOSTNAME", "KRB5CCNAME", "LS_COLORS", "PATH", "PS1", "PS2", "TZ", "XAUTHORITY", "XAUTHORIZATION", NULL }; /* * Initialize env based on envp. */ void env_init(char * const envp[]) { char * const *ep; size_t len; debug_decl(env_init, SUDO_DEBUG_ENV) if (envp == NULL) { /* Reset to initial state but keep a pointer to what we allocated. */ envp = env.envp; memset(&env, 0, sizeof(env)); env.old_envp = envp; } else { /* Make private copy of envp. */ for (ep = envp; *ep != NULL; ep++) continue; len = (size_t)(ep - envp); env.env_len = len; env.env_size = len + 1 + 128; env.envp = emalloc2(env.env_size, sizeof(char *)); #ifdef ENV_DEBUG memset(env.envp, 0, env.env_size * sizeof(char *)); #endif memcpy(env.envp, envp, len * sizeof(char *)); env.envp[len] = NULL; /* Free the old envp we allocated, if any. */ if (env.old_envp != NULL) efree((void *)env.old_envp); } debug_return; } /* * Getter for private copy of the environment. */ char ** env_get(void) { return env.envp; } /* * Similar to putenv(3) but operates on sudo's private copy of the * environment (not environ) and it always overwrites. The dupcheck param * determines whether we need to verify that the variable is not already set. * Will only overwrite an existing variable if overwrite is set. * Does not include warnings or debugging to avoid recursive calls. */ static int sudo_putenv_nodebug(char *str, bool dupcheck, bool overwrite) { char **ep; size_t len; bool found = false; /* Make sure there is room for the new entry plus a NULL. */ if (env.env_size > 2 && env.env_len > env.env_size - 2) { char **nenvp; size_t nsize; if (env.env_size > SIZE_MAX - 128) { errorx2(1, _("internal error, %s overflow"), "sudo_putenv_nodebug()"); } nsize = env.env_size + 128; if (nsize > SIZE_MAX / sizeof(char *)) { errorx2(1, _("internal error, %s overflow"), "sudo_putenv_nodebug()"); } nenvp = realloc(env.envp, nsize * sizeof(char *)); if (nenvp == NULL) { errno = ENOMEM; return -1; } env.envp = nenvp; env.env_size = nsize; #ifdef ENV_DEBUG memset(env.envp + env.env_len, 0, (env.env_size - env.env_len) * sizeof(char *)); #endif } #ifdef ENV_DEBUG if (env.envp[env.env_len] != NULL) { errno = EINVAL; return -1; } #endif if (dupcheck) { len = (strchr(str, '=') - str) + 1; for (ep = env.envp; *ep != NULL; ep++) { if (strncmp(str, *ep, len) == 0) { if (overwrite) *ep = str; found = true; break; } } /* Prune out extra instances of the variable we just overwrote. */ if (found && overwrite) { while (*++ep != NULL) { if (strncmp(str, *ep, len) == 0) { char **cur = ep; while ((*cur = *(cur + 1)) != NULL) cur++; ep--; } } env.env_len = ep - env.envp; } } if (!found) { ep = env.envp + env.env_len; env.env_len++; *ep++ = str; *ep = NULL; } return 0; } /* * Similar to putenv(3) but operates on sudo's private copy of the * environment (not environ) and it always overwrites. The dupcheck param * determines whether we need to verify that the variable is not already set. * Will only overwrite an existing variable if overwrite is set. */ static int sudo_putenv(char *str, bool dupcheck, bool overwrite) { int rval; debug_decl(sudo_putenv, SUDO_DEBUG_ENV) sudo_debug_printf(SUDO_DEBUG_INFO, "sudo_putenv: %s", str); rval = sudo_putenv_nodebug(str, dupcheck, overwrite); if (rval == -1) { #ifdef ENV_DEBUG if (env.envp[env.env_len] != NULL) errorx(1, _("sudo_putenv: corrupted envp, length mismatch")); #endif errorx(1, _("unable to allocate memory")); } debug_return_int(rval); } /* * Similar to setenv(3) but operates on a private copy of the environment. * The dupcheck param determines whether we need to verify that the variable * is not already set. */ static int sudo_setenv2(const char *var, const char *val, bool dupcheck, bool overwrite) { char *estring; size_t esize; int rval; debug_decl(sudo_setenv2, SUDO_DEBUG_ENV) esize = strlen(var) + 1 + strlen(val) + 1; estring = emalloc(esize); /* Build environment string and insert it. */ if (strlcpy(estring, var, esize) >= esize || strlcat(estring, "=", esize) >= esize || strlcat(estring, val, esize) >= esize) { errorx(1, _("internal error, %s overflow"), "sudo_setenv2()"); } rval = sudo_putenv(estring, dupcheck, overwrite); if (rval == -1) efree(estring); debug_return_int(rval); } /* * Similar to setenv(3) but operates on a private copy of the environment. * Does not include warnings or debugging to avoid recursive calls. */ static int sudo_setenv_nodebug(const char *var, const char *val, int overwrite) { char *estring; size_t esize; int rval = -1; esize = strlen(var) + 1 + strlen(val) + 1; if ((estring = malloc(esize)) == NULL) { errno = ENOMEM; goto done; } /* Build environment string and insert it. */ if (strlcpy(estring, var, esize) >= esize || strlcat(estring, "=", esize) >= esize || strlcat(estring, val, esize) >= esize) { errno = EINVAL; goto done; } rval = sudo_putenv_nodebug(estring, true, overwrite); done: if (rval == -1) efree(estring); return rval; } /* * Similar to setenv(3) but operates on a private copy of the environment. */ int sudo_setenv(const char *var, const char *val, int overwrite) { int rval; debug_decl(sudo_setenv, SUDO_DEBUG_ENV) rval = sudo_setenv_nodebug(var, val, overwrite); if (rval == -1) { if (errno == EINVAL) errorx(1, _("internal error, %s overflow"), "sudo_setenv()"); errorx(1, _("unable to allocate memory")); } debug_return_int(rval); } /* * Similar to unsetenv(3) but operates on a private copy of the environment. * Does not include warnings or debugging to avoid recursive calls. */ static int sudo_unsetenv_nodebug(const char *var) { char **ep = env.envp; size_t len; if (ep == NULL || var == NULL || *var == '\0' || strchr(var, '=') != NULL) { errno = EINVAL; return -1; } len = strlen(var); while (*ep != NULL) { if (strncmp(var, *ep, len) == 0 && (*ep)[len] == '=') { /* Found it; shift remainder + NULL over by one. */ char **cur = ep; while ((*cur = *(cur + 1)) != NULL) cur++; /* Keep going, could be multiple instances of the var. */ } else { ep++; } } return 0; } /* * Similar to unsetenv(3) but operates on a private copy of the environment. */ int sudo_unsetenv(const char *name) { int rval; debug_decl(sudo_unsetenv, SUDO_DEBUG_ENV) sudo_debug_printf(SUDO_DEBUG_INFO, "sudo_unsetenv: %s", name); rval = sudo_unsetenv_nodebug(name); debug_return_int(rval); } /* * Similar to getenv(3) but operates on a private copy of the environment. * Does not include warnings or debugging to avoid recursive calls. */ static char * sudo_getenv_nodebug(const char *name) { char **ep, *val = NULL; size_t namelen = 0; if (env.env_len != 0) { /* For BSD compatibility, treat '=' in name like end of string. */ while (name[namelen] != '\0' && name[namelen] != '=') namelen++; for (ep = env.envp; *ep != NULL; ep++) { if (strncmp(*ep, name, namelen) == 0 && (*ep)[namelen] == '=') { val = *ep + namelen + 1; break; } } } return val; } /* * Similar to getenv(3) but operates on a private copy of the environment. */ char * sudo_getenv(const char *name) { char *val; debug_decl(sudo_getenv, SUDO_DEBUG_ENV) sudo_debug_printf(SUDO_DEBUG_INFO, "sudo_getenv: %s", name); val = sudo_getenv_nodebug(name); debug_return_str(val); } /* * Merge another environment with our private copy. */ void env_merge(char * const envp[], bool overwrite) { char * const *ep; debug_decl(env_merge, SUDO_DEBUG_ENV) for (ep = envp; *ep != NULL; ep++) sudo_putenv(*ep, true, overwrite); debug_return; } /* * Check the env_delete blacklist. * Returns true if the variable was found, else false. */ static bool matches_env_delete(const char *var) { struct list_member *cur; size_t len; bool iswild; bool match = false; debug_decl(matches_env_delete, SUDO_DEBUG_ENV) /* Skip anything listed in env_delete. */ for (cur = def_env_delete; cur; cur = cur->next) { len = strlen(cur->value); /* Deal with '*' wildcard */ if (cur->value[len - 1] == '*') { len--; iswild = true; } else iswild = false; if (strncmp(cur->value, var, len) == 0 && (iswild || var[len] == '=')) { match = true; break; } } debug_return_bool(match); } /* * Apply the env_check list. * Returns true if the variable is allowed, false if denied * or -1 if no match. */ static int matches_env_check(const char *var) { struct list_member *cur; size_t len; bool iswild; int keepit = -1; debug_decl(matches_env_check, SUDO_DEBUG_ENV) for (cur = def_env_check; cur; cur = cur->next) { len = strlen(cur->value); /* Deal with '*' wildcard */ if (cur->value[len - 1] == '*') { len--; iswild = true; } else iswild = false; if (strncmp(cur->value, var, len) == 0 && (iswild || var[len] == '=')) { keepit = !strpbrk(var, "/%"); break; } } debug_return_bool(keepit); } /* * Check the env_keep list. * Returns true if the variable is allowed else false. */ static bool matches_env_keep(const char *var) { struct list_member *cur; size_t len; bool iswild, keepit = false; debug_decl(matches_env_keep, SUDO_DEBUG_ENV) /* Preserve SHELL variable for "sudo -s". */ if (ISSET(sudo_mode, MODE_SHELL) && strncmp(var, "SHELL=", 6) == 0) { keepit = true; goto done; } for (cur = def_env_keep; cur; cur = cur->next) { len = strlen(cur->value); /* Deal with '*' wildcard */ if (cur->value[len - 1] == '*') { len--; iswild = true; } else iswild = false; if (strncmp(cur->value, var, len) == 0 && (iswild || var[len] == '=')) { keepit = true; break; } } done: debug_return_bool(keepit); } /* * Look up var in the env_delete and env_check. * Returns true if we should delete the variable, else false. */ static bool env_should_delete(const char *var) { int delete_it; debug_decl(env_should_delete, SUDO_DEBUG_ENV); delete_it = matches_env_delete(var); if (!delete_it) delete_it = matches_env_check(var) == false; sudo_debug_printf(SUDO_DEBUG_INFO, "delete %s: %s", var, delete_it ? "YES" : "NO"); debug_return_bool(delete_it); } /* * Lookup var in the env_check and env_keep lists. * Returns true if the variable is allowed else false. */ static bool env_should_keep(const char *var) { int keepit; debug_decl(env_should_keep, SUDO_DEBUG_ENV) keepit = matches_env_check(var); if (keepit == -1) keepit = matches_env_keep(var); sudo_debug_printf(SUDO_DEBUG_INFO, "keep %s: %s", var, keepit ? "YES" : "NO"); debug_return_bool(keepit == true); } static void env_update_didvar(const char *ep, unsigned int *didvar) { switch (*ep) { case 'H': if (strncmp(ep, "HOME=", 5) == 0) SET(*didvar, DID_HOME); break; case 'L': if (strncmp(ep, "LOGNAME=", 8) == 0) SET(*didvar, DID_LOGNAME); break; case 'M': if (strncmp(ep, "MAIL=", 5) == 0) SET(*didvar, DID_MAIL); break; case 'P': if (strncmp(ep, "PATH=", 5) == 0) SET(*didvar, DID_PATH); break; case 'S': if (strncmp(ep, "SHELL=", 6) == 0) SET(*didvar, DID_SHELL); break; case 'T': if (strncmp(ep, "TERM=", 5) == 0) SET(*didvar, DID_TERM); break; case 'U': if (strncmp(ep, "USER=", 5) == 0) SET(*didvar, DID_USER); if (strncmp(ep, "USERNAME=", 5) == 0) SET(*didvar, DID_USERNAME); break; } } /* * Build a new environment and ether clear potentially dangerous * variables from the old one or start with a clean slate. * Also adds sudo-specific variables (SUDO_*). */ void rebuild_env(void) { char **old_envp, **ep, *cp, *ps1; char idbuf[MAX_UID_T_LEN + 1]; unsigned int didvar; bool reset_home = false; /* * Either clean out the environment or reset to a safe default. */ ps1 = NULL; didvar = 0; env.env_len = 0; env.env_size = 128; old_envp = env.envp; env.envp = emalloc2(env.env_size, sizeof(char *)); #ifdef ENV_DEBUG memset(env.envp, 0, env.env_size * sizeof(char *)); #else env.envp[0] = NULL; #endif /* Reset HOME based on target user if configured to. */ if (ISSET(sudo_mode, MODE_RUN)) { if (def_always_set_home || ISSET(sudo_mode, MODE_RESET_HOME | MODE_LOGIN_SHELL) || (ISSET(sudo_mode, MODE_SHELL) && def_set_home)) reset_home = true; } if (def_env_reset || ISSET(sudo_mode, MODE_LOGIN_SHELL)) { /* * If starting with a fresh environment, initialize it based on * /etc/environment or login.conf. For "sudo -i" we want those * variables to override the invoking user's environment, so we * defer reading them until later. */ if (!ISSET(sudo_mode, MODE_LOGIN_SHELL)) { #ifdef HAVE_LOGIN_CAP_H /* Insert login class environment variables. */ if (login_class) { login_cap_t *lc = login_getclass(login_class); if (lc != NULL) { setusercontext(lc, runas_pw, runas_pw->pw_uid, LOGIN_SETPATH|LOGIN_SETENV); login_close(lc); } } #endif /* HAVE_LOGIN_CAP_H */ #if defined(_AIX) || (defined(__linux__) && !defined(HAVE_PAM)) /* Insert system-wide environment variables. */ read_env_file(_PATH_ENVIRONMENT, true); #endif for (ep = env.envp; *ep; ep++) env_update_didvar(*ep, &didvar); } /* Pull in vars we want to keep from the old environment. */ for (ep = old_envp; *ep; ep++) { bool keepit; /* Skip variables with values beginning with () (bash functions) */ if ((cp = strchr(*ep, '=')) != NULL) { if (strncmp(cp, "=() ", 3) == 0) continue; } /* * Look up the variable in the env_check and env_keep lists. */ keepit = env_should_keep(*ep); /* * Do SUDO_PS1 -> PS1 conversion. * This must happen *after* env_should_keep() is called. */ if (strncmp(*ep, "SUDO_PS1=", 8) == 0) ps1 = *ep + 5; if (keepit) { /* Preserve variable. */ sudo_putenv(*ep, false, false); env_update_didvar(*ep, &didvar); } } didvar |= didvar << 8; /* convert DID_* to KEPT_* */ /* * Add in defaults. In -i mode these come from the runas user, * otherwise they may be from the user's environment (depends * on sudoers options). */ if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) { sudo_setenv2("SHELL", runas_pw->pw_shell, ISSET(didvar, DID_SHELL), true); sudo_setenv2("LOGNAME", runas_pw->pw_name, ISSET(didvar, DID_LOGNAME), true); sudo_setenv2("USER", runas_pw->pw_name, ISSET(didvar, DID_USER), true); sudo_setenv2("USERNAME", runas_pw->pw_name, ISSET(didvar, DID_USERNAME), true); } else { if (!ISSET(didvar, DID_SHELL)) sudo_setenv2("SHELL", sudo_user.pw->pw_shell, false, true); /* We will set LOGNAME later in the !def_set_logname case. */ if (!def_set_logname) { if (!ISSET(didvar, DID_LOGNAME)) sudo_setenv2("LOGNAME", user_name, false, true); if (!ISSET(didvar, DID_USER)) sudo_setenv2("USER", user_name, false, true); if (!ISSET(didvar, DID_USERNAME)) sudo_setenv2("USERNAME", user_name, false, true); } } /* If we didn't keep HOME, reset it based on target user. */ if (!ISSET(didvar, KEPT_HOME)) reset_home = true; /* * Set MAIL to target user in -i mode or if MAIL is not preserved * from user's environment. */ if (ISSET(sudo_mode, MODE_LOGIN_SHELL) || !ISSET(didvar, KEPT_MAIL)) { cp = _PATH_MAILDIR; if (cp[sizeof(_PATH_MAILDIR) - 2] == '/') easprintf(&cp, "MAIL=%s%s", _PATH_MAILDIR, runas_pw->pw_name); else easprintf(&cp, "MAIL=%s/%s", _PATH_MAILDIR, runas_pw->pw_name); sudo_putenv(cp, ISSET(didvar, DID_MAIL), true); } } else { /* * Copy environ entries as long as they don't match env_delete or * env_check. */ for (ep = old_envp; *ep; ep++) { /* Skip variables with values beginning with () (bash functions) */ if ((cp = strchr(*ep, '=')) != NULL) { if (strncmp(cp, "=() ", 3) == 0) continue; } /* Add variable unless it matches a black list. */ if (!env_should_delete(*ep)) { if (strncmp(*ep, "SUDO_PS1=", 9) == 0) ps1 = *ep + 5; else if (strncmp(*ep, "PATH=", 5) == 0) SET(didvar, DID_PATH); else if (strncmp(*ep, "TERM=", 5) == 0) SET(didvar, DID_TERM); sudo_putenv(*ep, false, false); } } } /* Replace the PATH envariable with a secure one? */ if (def_secure_path && !user_is_exempt()) { sudo_setenv2("PATH", def_secure_path, true, true); SET(didvar, DID_PATH); } /* * Set $USER, $LOGNAME and $USERNAME to target if "set_logname" is not * disabled. We skip this if we are running a login shell (because * they have already been set) or sudoedit (because we want the editor * to find the invoking user's startup files). */ if (def_set_logname && !ISSET(sudo_mode, MODE_LOGIN_SHELL|MODE_EDIT)) { if (!ISSET(didvar, KEPT_LOGNAME)) sudo_setenv2("LOGNAME", runas_pw->pw_name, true, true); if (!ISSET(didvar, KEPT_USER)) sudo_setenv2("USER", runas_pw->pw_name, true, true); if (!ISSET(didvar, KEPT_USERNAME)) sudo_setenv2("USERNAME", runas_pw->pw_name, true, true); } /* Set $HOME to target user if not preserving user's value. */ if (reset_home) sudo_setenv2("HOME", runas_pw->pw_dir, true, true); /* Provide default values for $TERM and $PATH if they are not set. */ if (!ISSET(didvar, DID_TERM)) sudo_putenv("TERM=unknown", false, false); if (!ISSET(didvar, DID_PATH)) sudo_setenv2("PATH", _PATH_STDPATH, false, true); /* Set PS1 if SUDO_PS1 is set. */ if (ps1 != NULL) sudo_putenv(ps1, true, true); /* Add the SUDO_COMMAND envariable (cmnd + args). */ if (user_args) { easprintf(&cp, "%s %s", user_cmnd, user_args); sudo_setenv2("SUDO_COMMAND", cp, true, true); efree(cp); } else { sudo_setenv2("SUDO_COMMAND", user_cmnd, true, true); } /* Add the SUDO_USER, SUDO_UID, SUDO_GID environment variables. */ sudo_setenv2("SUDO_USER", user_name, true, true); snprintf(idbuf, sizeof(idbuf), "%u", (unsigned int) user_uid); sudo_setenv2("SUDO_UID", idbuf, true, true); snprintf(idbuf, sizeof(idbuf), "%u", (unsigned int) user_gid); sudo_setenv2("SUDO_GID", idbuf, true, true); /* Free old environment. */ efree(old_envp); } void insert_env_vars(char * const envp[]) { char * const *ep; if (envp == NULL) return; /* Add user-specified environment variables. */ for (ep = envp; *ep != NULL; ep++) sudo_putenv(*ep, true, true); } /* * Validate the list of environment variables passed in on the command * line against env_delete, env_check, and env_keep. * Calls log_fatal() if any specified variables are not allowed. */ void validate_env_vars(char * const env_vars[]) { char * const *ep; char *eq, *bad = NULL; size_t len, blen = 0, bsize = 0; bool okvar; if (env_vars == NULL) return; /* Add user-specified environment variables. */ for (ep = env_vars; *ep != NULL; ep++) { if (def_secure_path && !user_is_exempt() && strncmp(*ep, "PATH=", 5) == 0) { okvar = false; } else if (def_env_reset) { okvar = env_should_keep(*ep); } else { okvar = !env_should_delete(*ep); } if (okvar == false) { /* Not allowed, add to error string, allocating as needed. */ if ((eq = strchr(*ep, '=')) != NULL) *eq = '\0'; len = strlen(*ep) + 2; if (blen + len >= bsize) { do { bsize += 1024; } while (blen + len >= bsize); bad = erealloc(bad, bsize); bad[blen] = '\0'; } strlcat(bad, *ep, bsize); strlcat(bad, ", ", bsize); blen += len; if (eq != NULL) *eq = '='; } } if (bad != NULL) { bad[blen - 2] = '\0'; /* remove trailing ", " */ log_fatal(NO_MAIL, _("sorry, you are not allowed to set the following environment variables: %s"), bad); /* NOTREACHED */ efree(bad); } } /* * Read in /etc/environment ala AIX and Linux. * Lines may be in either of three formats: * NAME=VALUE * NAME="VALUE" * NAME='VALUE' * with an optional "export" prefix so the shell can source the file. * Invalid lines, blank lines, or lines consisting solely of a comment * character are skipped. */ void read_env_file(const char *path, int overwrite) { FILE *fp; char *cp, *var, *val; size_t var_len, val_len; if ((fp = fopen(path, "r")) == NULL) return; while ((var = sudo_parseln(fp)) != NULL) { /* Skip blank or comment lines */ if (*var == '\0') continue; /* Skip optional "export " */ if (strncmp(var, "export", 6) == 0 && isspace((unsigned char) var[6])) { var += 7; while (isspace((unsigned char) *var)) { var++; } } /* Must be of the form name=["']value['"] */ for (val = var; *val != '\0' && *val != '='; val++) ; if (var == val || *val != '=') continue; var_len = (size_t)(val - var); val_len = strlen(++val); /* Strip leading and trailing single/double quotes */ if ((val[0] == '\'' || val[0] == '\"') && val[0] == val[val_len - 1]) { val[val_len - 1] = '\0'; val++; val_len -= 2; } cp = emalloc(var_len + 1 + val_len + 1); memcpy(cp, var, var_len + 1); /* includes '=' */ memcpy(cp + var_len + 1, val, val_len + 1); /* includes NUL */ sudo_putenv(cp, true, overwrite); } fclose(fp); } void init_envtables(void) { struct list_member *cur; const char **p; /* Fill in the "env_delete" list. */ for (p = initial_badenv_table; *p; p++) { cur = ecalloc(1, sizeof(struct list_member)); cur->value = estrdup(*p); cur->next = def_env_delete; def_env_delete = cur; } /* Fill in the "env_check" list. */ for (p = initial_checkenv_table; *p; p++) { cur = ecalloc(1, sizeof(struct list_member)); cur->value = estrdup(*p); cur->next = def_env_check; def_env_check = cur; } /* Fill in the "env_keep" list. */ for (p = initial_keepenv_table; *p; p++) { cur = ecalloc(1, sizeof(struct list_member)); cur->value = estrdup(*p); cur->next = def_env_keep; def_env_keep = cur; } } int sudoers_hook_getenv(const char *name, char **value, void *closure) { static bool in_progress = false; /* avoid recursion */ if (in_progress || env.envp == NULL) return SUDO_HOOK_RET_NEXT; in_progress = true; *value = sudo_getenv_nodebug(name); in_progress = false; return SUDO_HOOK_RET_STOP; } int sudoers_hook_putenv(char *string, void *closure) { static bool in_progress = false; /* avoid recursion */ if (in_progress || env.envp == NULL) return SUDO_HOOK_RET_NEXT; in_progress = true; sudo_putenv_nodebug(string, true, true); in_progress = false; return SUDO_HOOK_RET_STOP; } int sudoers_hook_setenv(const char *name, const char *value, int overwrite, void *closure) { static bool in_progress = false; /* avoid recursion */ if (in_progress || env.envp == NULL) return SUDO_HOOK_RET_NEXT; in_progress = true; sudo_setenv_nodebug(name, value, overwrite); in_progress = false; return SUDO_HOOK_RET_STOP; } int sudoers_hook_unsetenv(const char *name, void *closure) { static bool in_progress = false; /* avoid recursion */ if (in_progress || env.envp == NULL) return SUDO_HOOK_RET_NEXT; in_progress = true; sudo_unsetenv_nodebug(name); in_progress = false; return SUDO_HOOK_RET_STOP; }