/*
- * Copyright (c) 2000, 2001 Todd C. Miller <Todd.Miller@courtesan.com>
- * All rights reserved.
+ * Copyright (c) 2000-2005, 2007-2010
+ * Todd C. Miller <Todd.Miller@courtesan.com>
*
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
+ * 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.
*
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
+ * 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.
*
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * 4. Products derived from this software may not be called "Sudo" nor
- * may "Sudo" appear in their names without specific prior written
- * permission from the author.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
- * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 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 "config.h"
+#include <config.h>
#include <sys/types.h>
#include <sys/param.h>
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# include <string.h>
-#else
-# ifdef HAVE_STRINGS_H
-# include <strings.h>
-# endif
#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
-#include <pwd.h>
+#include <ctype.h>
#include <errno.h>
+#include <pwd.h>
#include "sudo.h"
-#ifndef lint
-static const char rcsid[] = "$Sudo: env.c,v 1.16 2002/04/18 15:38:52 millert Exp $";
-#endif /* lint */
-
/*
- * Flags used in env_reset()
+ * Flags used in rebuild_env()
*/
#undef DID_TERM
-#define DID_TERM 0x01
+#define DID_TERM 0x0001
#undef DID_PATH
-#define DID_PATH 0x02
+#define DID_PATH 0x0002
#undef DID_HOME
-#define DID_HOME 0x04
+#define DID_HOME 0x0004
#undef DID_SHELL
-#define DID_SHELL 0x08
+#define DID_SHELL 0x0008
#undef DID_LOGNAME
-#define DID_LOGNAME 0x10
-#undef DID_USER
-#define DID_USER 0x12
+#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 **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 */
+ int owned; /* do we own envp or is it the system's? */
+};
/*
* Prototypes
*/
-char **rebuild_env __P((int, char **));
-char **zero_env __P((char **));
-static void insert_env __P((char **, char *));
-static char *format_env __P((char *, char *));
+static void sudo_setenv __P((const char *, const char *, int));
+static void sudo_putenv __P((char *, int, int));
+
+extern char **environ; /* global environment */
+
+/*
+ * 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 '/'?
*/
-char *initial_badenv_table[] = {
+static const char *initial_badenv_table[] = {
"IFS",
"CDPATH",
- "SHELLOPTS",
- "PS4",
"LOCALDOMAIN",
"RES_OPTIONS",
"HOSTALIASES",
"SHLIB_PATH",
#endif /* __hpux */
#ifdef _AIX
+ "LDR_*",
"LIBPATH",
-#endif /* _AIX */
+ "AUTHSTATE",
+#endif
+#ifdef __APPLE__
+ "DYLD_*",
+#endif
#ifdef HAVE_KERB4
"KRB_CONF*",
- "KRBCONFDIR"
+ "KRBCONFDIR",
"KRBTKFILE",
#endif /* HAVE_KERB4 */
#ifdef HAVE_KERB5
"KRB5_CONFIG*",
+ "KRB5_KTNAME",
#endif /* HAVE_KERB5 */
#ifdef HAVE_SECURID
"VAR_ACE",
"USR_ACE",
"DLC_ACE",
#endif /* HAVE_SECURID */
- "TERMINFO",
- "TERMINFO_DIRS",
- "TERMPATH",
+ "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",
- "BASH_ENV",
+ "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.
*/
-char *initial_checkenv_table[] = {
- "LC_*",
+static const char *initial_checkenv_table[] = {
+ "COLORTERM",
"LANG",
"LANGUAGE",
+ "LC_*",
+ "LINGUAS",
"TERM",
NULL
};
/*
- * Zero out environment and replace with a minimal set of
- * USER, LOGNAME, HOME, TZ, PATH (XXX - should just set path to default)
- * May set user_path, user_shell, and/or user_prompt as side effects.
+ * 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(lazy)
+ int lazy;
+{
+ char * const *ep;
+ size_t len;
+
+ for (ep = environ; *ep != NULL; ep++)
+ continue;
+ len = (size_t)(ep - environ);
+
+ if (lazy) {
+ /*
+ * If we are already initialized due to lazy init (usualy via getenv())
+ * we need to avoid calling malloc() as it may call getenv() itself.
+ */
+ env.envp = environ;
+ env.env_len = len;
+ env.env_size = len;
+ } else if (!env.owned) {
+ 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, environ, len * sizeof(char *));
+ env.envp[len] = '\0';
+ env.owned = TRUE;
+ }
+}
+
char **
-zero_env(envp)
- char **envp;
+env_get()
{
- char **ep, **nep;
- static char *newenv[7];
-
- for (ep = envp; *ep; ep++) {
- switch (**ep) {
- case 'H':
- if (strncmp("HOME=", *ep, 5) == 0)
- break;
- continue;
- case 'L':
- if (strncmp("LOGNAME=", *ep, 8) == 0)
- break;
- continue;
- case 'P':
- if (strncmp("PATH=", *ep, 5) == 0) {
- user_path = *ep + 5;
- /* XXX - set to sane default instead of user's? */
- break;
- }
- continue;
- case 'S':
- if (strncmp("SHELL=", *ep, 6) == 0)
- user_shell = *ep + 6;
- else if (!user_prompt && !strncmp("SUDO_PROMPT=", *ep, 12))
- user_prompt = *ep + 12;
- continue;
- case 'T':
- if (strncmp("TZ=", *ep, 3) == 0)
- break;
- continue;
- case 'U':
- if (strncmp("USER=", *ep, 5) == 0)
- break;
- continue;
- default:
- continue;
- }
+ return env.envp;
+}
+
+/*
+ * Similar to setenv(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.
+ */
+static void
+sudo_setenv(var, val, dupcheck)
+ const char *var;
+ const char *val;
+ int dupcheck;
+{
+ char *estring;
+ size_t esize;
+
+ 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, sudo_setenv() overflow");
+ }
+ sudo_putenv(estring, dupcheck, TRUE);
+}
+
+/*
+ * Version of getenv(3) that uses our own environ pointer.
+ */
+char *
+getenv(var)
+ const char *var;
+{
+ char *cp, **ev;
+ size_t vlen = strlen(var);
+
+ if (env.envp == NULL)
+ env_init(TRUE);
+
+ for (ev = env.envp; (cp = *ev) != NULL; ev++) {
+ if (strncmp(var, cp, vlen) == 0 && cp[vlen] == '=')
+ return cp + vlen + 1;
+ }
+ return NULL;
+}
+
+/*
+ * Version of setenv(3) that uses our own environ pointer.
+ */
+int
+setenv(var, val, overwrite)
+ const char *var;
+ const char *val;
+ int overwrite;
+{
+ char *estring, *ep;
+ const char *cp;
+ size_t esize;
+
+ if (!var || *var == '\0') {
+ errno = EINVAL;
+ return(-1);
+ }
+
+ if (env.envp == NULL)
+ env_init(TRUE);
+
+ /*
+ * POSIX says a var name with '=' is an error but BSD
+ * just ignores the '=' and anything after it.
+ */
+ for (cp = var; *cp && *cp != '='; cp++)
+ ;
+ esize = (size_t)(cp - var) + 2;
+ if (val) {
+ esize += strlen(val); /* glibc treats a NULL val as "" */
+ }
+
+ /* Allocate and fill in estring. */
+ estring = ep = emalloc(esize);
+ for (cp = var; *cp && *cp != '='; cp++)
+ *ep++ = *cp;
+ *ep++ = '=';
+ if (val) {
+ for (cp = val; *cp; cp++)
+ *ep++ = *cp;
+ }
+ *ep = '\0';
+
+#ifdef ENV_DEBUG
+ if (env.envp[env.env_len] != NULL)
+ errorx(1, "setenv: corrupted envp, len mismatch");
+#endif
+ sudo_putenv(estring, TRUE, overwrite);
+ return(0);
+}
+
+/*
+ * Version of unsetenv(3) that uses our own environ pointer.
+ */
+#ifdef UNSETENV_VOID
+void
+#else
+int
+#endif
+unsetenv(var)
+ const char *var;
+{
+ char **ep;
+ size_t len;
+
+ if (var == NULL || *var == '\0' || strchr(var, '=') != NULL) {
+ errno = EINVAL;
+#ifdef UNSETENV_VOID
+ return;
+#else
+ return(-1);
+#endif
+ }
+
+ if (env.envp == NULL)
+ env_init(TRUE);
+
+#ifdef ENV_DEBUG
+ if (env.envp[env.env_len] != NULL)
+ errorx(1, "unsetenv: corrupted envp, len mismatch");
+#endif
- /* Deal with multiply defined variables (take first instance) */
- for (nep = newenv; *nep; nep++) {
- if (**nep == **ep)
- break;
+ len = strlen(var);
+ for (ep = env.envp; *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++;
}
- if (*nep == NULL)
- *nep++ = *ep;
}
- return(&newenv[0]);
+ env.env_len = ep - env.envp;
+#ifndef UNSETENV_VOID
+ return(0);
+#endif
}
/*
- * Given a variable and value, allocate and format an environment string.
+ * Version of putenv(3) that uses our own environ pointer.
*/
-static char *
-format_env(var, val)
- char *var;
- char *val;
+int
+#ifdef PUTENV_CONST
+putenv(const char *string)
+#else
+putenv(string)
+ char *string;
+#endif
{
- char *estring, *p;
- size_t varlen, vallen;
-
- varlen = strlen(var);
- vallen = strlen(val);
- p = estring = (char *) emalloc(varlen + vallen + 2);
- strcpy(p, var);
- p += varlen;
- *p++ = '=';
- strcpy(p, val);
-
- return(estring);
+ if (env.envp == NULL)
+ env_init(TRUE);
+
+ if (strchr(string, '=') == NULL) {
+ errno = EINVAL;
+ return(-1);
+ }
+#ifdef ENV_DEBUG
+ if (env.envp[env.env_len] != NULL)
+ errorx(1, "putenv: corrupted envp, len mismatch");
+#endif
+ sudo_putenv((char *)string, TRUE, TRUE);
+ return(0);
}
/*
- * Insert str into envp.
- * Assumes str has an '=' in it and does not check for available space!
+ * 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 void
-insert_env(envp, str)
- char **envp;
+sudo_putenv(str, dupcheck, overwrite)
char *str;
+ int dupcheck;
+ int overwrite;
{
char **ep;
- size_t varlen;
+ size_t len;
+ int found = FALSE;
+
+ /* Make sure there is room for the new entry plus a NULL. */
+ if (env.env_len + 2 > env.env_size) {
+ env.env_size += 128;
+ if (env.owned) {
+ env.envp = erealloc3(env.envp, env.env_size, sizeof(char *));
+ } else {
+ /* We don't own env.envp, allocate a new one. */
+ ep = emalloc2(env.env_size, sizeof(char *));
+ memcpy(ep, env.envp, env.env_size * sizeof(char *));
+ env.envp = ep;
+ env.owned = TRUE;
+ }
+#ifdef ENV_DEBUG
+ memset(env.envp + env.env_len, 0,
+ (env.env_size - env.env_len) * sizeof(char *));
+#endif
+ }
- varlen = (strchr(str, '=') - str) + 1;
+#ifdef ENV_DEBUG
+ if (env.envp[env.env_len] != NULL)
+ errorx(1, "sudo_putenv: corrupted envp, len mismatch");
+#endif
- for (ep = envp; *ep; ep++) {
- if (strncmp(str, *ep, varlen) == 0) {
- *ep = str;
- break;
+ if (dupcheck) {
+ len = (strchr(str, '=') - str) + 1;
+ for (ep = env.envp; !found && *ep != NULL; ep++) {
+ if (strncmp(str, *ep, len) == 0) {
+ if (overwrite)
+ *ep = str;
+ found = TRUE;
+ }
+ }
+ /* Prune out duplicate variables. */
+ if (found && overwrite) {
+ while (*ep != NULL) {
+ if (strncmp(str, *ep, len) == 0) {
+ char **cur = ep;
+ while ((*cur = *(cur + 1)) != NULL)
+ cur++;
+ } else {
+ ep++;
+ }
+ }
+ env.env_len = ep - env.envp;
}
}
- if (*ep == NULL) {
+
+ if (!found) {
+ ep = env.envp + env.env_len;
+ env.env_len++;
*ep++ = str;
*ep = NULL;
}
}
+/*
+ * Check the env_delete blacklist.
+ * Returns TRUE if the variable was found, else false.
+ */
+static int
+matches_env_delete(var)
+ const char *var;
+{
+ struct list_member *cur;
+ size_t len;
+ int iswild, match = FALSE;
+
+ /* 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;
+ }
+ }
+ return(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(var)
+ const char *var;
+{
+ struct list_member *cur;
+ size_t len;
+ int iswild, keepit = -1;
+
+ 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;
+ }
+ }
+ return(keepit);
+}
+
+/*
+ * Check the env_keep list.
+ * Returns TRUE if the variable is allowed else FALSE.
+ */
+static int
+matches_env_keep(var)
+ const char *var;
+{
+ struct list_member *cur;
+ size_t len;
+ int iswild, keepit = FALSE;
+
+ 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;
+ }
+ }
+ return(keepit);
+}
+
/*
* 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_*).
*/
-char **
-rebuild_env(sudo_mode, envp)
- int sudo_mode;
- char **envp;
+void
+rebuild_env(noexec)
+ int noexec;
{
- char **newenvp, **ep, **nep, *cp, *ps1;
- int okvar, iswild, didvar;
- size_t env_size, len;
- struct list_member *cur;
-
- /* Count number of items in "env_keep" list (if any) */
- for (len = 0, cur = def_list(I_ENV_KEEP); cur; cur = cur->next)
- len++;
+ char **old_envp, **ep, *cp, *ps1;
+ char idbuf[MAX_UID_T_LEN];
+ unsigned int didvar;
+ int reset_home = FALSE;
/*
* Either clean out the environment or reset to a safe default.
*/
ps1 = NULL;
didvar = 0;
- if (def_flag(I_ENV_RESET)) {
- int keepit;
+ 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 *));
+#endif
- /* Alloc space for new environment. */
- env_size = 32 + len;
- nep = newenvp = (char **) emalloc(env_size * sizeof(char *));
+ /* 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)) {
/* Pull in vars we want to keep from the old environment. */
- for (ep = envp; *ep; ep++) {
- keepit = 0;
+ for (ep = old_envp; *ep; ep++) {
+ int keepit;
/* Skip variables with values beginning with () (bash functions) */
- if ((cp = strchr(*ep, '=')) != NULL &&
- strncmp(cp, "=() ", 3) == 0)
- continue;
-
- for (cur = def_list(I_ENV_KEEP); cur; cur = cur->next) {
- len = strlen(cur->value);
- /* Deal with '*' wildcard */
- if (cur->value[len - 1] == '*') {
- len--;
- iswild = 1;
- } else
- iswild = 0;
- if (strncmp(cur->value, *ep, len) == 0 &&
- (iswild || (*ep)[len] == '=')) {
- /* We always preserve TERM, no special treatment needed. */
- if (strncmp(*ep, "TERM=", 5) != 0)
- keepit = 1;
- break;
- }
+ if ((cp = strchr(*ep, '=')) != NULL) {
+ if (strncmp(cp, "=() ", 3) == 0)
+ continue;
}
- if (!strncmp (*ep, "DISPLAY=",8)
- || !strncmp (*ep, "XAUTHORITY=", 11)
- || !strncmp (*ep, "XAUTHORIZATION=", 15)
- || !strncmp (*ep, "LANG=", 5)
- || !strncmp (*ep, "LANGUAGE=", 9)
- || !strncmp (*ep, "LC_", 3))
- keepit = 1;
+ /*
+ * First check certain variables for '%' and '/' characters.
+ * If no match there, check the keep list.
+ * If nothing matched, we remove it from the environment.
+ */
+ keepit = matches_env_check(*ep);
+ if (keepit == -1)
+ keepit = matches_env_keep(*ep);
/* For SUDO_PS1 -> PS1 conversion. */
if (strncmp(*ep, "SUDO_PS1=", 8) == 0)
switch (**ep) {
case 'H':
if (strncmp(*ep, "HOME=", 5) == 0)
- didvar |= DID_HOME;
- break;
- case 'S':
- if (strncmp(*ep, "SHELL=", 6) == 0)
- didvar |= DID_SHELL;
- break;
+ SET(didvar, DID_HOME);
+ break;
case 'L':
if (strncmp(*ep, "LOGNAME=", 8) == 0)
- didvar |= DID_LOGNAME;
- break;
+ 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)
- didvar |= DID_USER;
- break;
- }
- *nep++ = *ep;
- } else {
- /* Preserve TERM and PATH, ignore anything else. */
- if (!(didvar & DID_TERM) && !strncmp(*ep, "TERM=", 5)) {
- *nep++ = *ep;
- didvar |= DID_TERM;
- } else if (!(didvar & DID_PATH) && !strncmp(*ep, "PATH=", 5)) {
- *nep++ = *ep;
- didvar |= DID_PATH;
+ SET(didvar, DID_USER);
+ if (strncmp(*ep, "USERNAME=", 5) == 0)
+ SET(didvar, DID_USERNAME);
+ break;
}
+ sudo_putenv(*ep, FALSE, FALSE);
}
}
+ didvar |= didvar << 8; /* convert DID_* to KEPT_* */
/*
- * Add in defaults unless they were preserved from the
- * user's environment.
+ * 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 (!(didvar & DID_HOME))
- *nep++ = format_env("HOME", user_dir);
- if (!(didvar & DID_SHELL))
- *nep++ = format_env("SHELL", sudo_user.pw->pw_shell);
- if (!(didvar & DID_LOGNAME))
- *nep++ = format_env("LOGNAME", user_name);
- if (!(didvar & DID_USER))
- *nep++ = format_env("USER", user_name);
- } else {
- /* Alloc space for new environment. */
- for (env_size = 16 + len, ep = envp; *ep; ep++, env_size++)
- ;
- nep = newenvp = (char **) emalloc(env_size * sizeof(char *));
+ if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
+ sudo_setenv("SHELL", runas_pw->pw_shell, ISSET(didvar, DID_SHELL));
+ sudo_setenv("LOGNAME", runas_pw->pw_name,
+ ISSET(didvar, DID_LOGNAME));
+ sudo_setenv("USER", runas_pw->pw_name, ISSET(didvar, DID_USER));
+ sudo_setenv("USERNAME", runas_pw->pw_name,
+ ISSET(didvar, DID_USERNAME));
+ } else {
+ if (!ISSET(didvar, DID_SHELL))
+ sudo_setenv("SHELL", sudo_user.pw->pw_shell, FALSE);
+ if (!ISSET(didvar, DID_LOGNAME))
+ sudo_setenv("LOGNAME", user_name, FALSE);
+ if (!ISSET(didvar, DID_USER))
+ sudo_setenv("USER", user_name, FALSE);
+ if (!ISSET(didvar, DID_USERNAME))
+ sudo_setenv("USERNAME", user_name, FALSE);
+ }
+
+ /* If we didn't keep HOME, reset it based on target user. */
+ if (!ISSET(didvar, KEPT_HOME))
+ reset_home = TRUE;
/*
- * Copy envp entries as long as they don't match env_delete or
+ * 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 = envp; *ep; ep++) {
- okvar = 1;
+ for (ep = old_envp; *ep; ep++) {
+ int okvar;
/* Skip variables with values beginning with () (bash functions) */
- if ((cp = strchr(*ep, '=')) != NULL &&
- strncmp(cp, "=() ", 3) == 0)
- continue;
-
- /* Skip anything listed in env_delete. */
- for (cur = def_list(I_ENV_DELETE); cur && okvar; cur = cur->next) {
- len = strlen(cur->value);
- /* Deal with '*' wildcard */
- if (cur->value[len - 1] == '*') {
- len--;
- iswild = 1;
- } else
- iswild = 0;
- if (strncmp(cur->value, *ep, len) == 0 &&
- (iswild || (*ep)[len] == '=')) {
- okvar = 0;
- }
+ if ((cp = strchr(*ep, '=')) != NULL) {
+ if (strncmp(cp, "=() ", 3) == 0)
+ continue;
}
- /* Check certain variables for '%' and '/' characters. */
- for (cur = def_list(I_ENV_CHECK); cur && okvar; cur = cur->next) {
- len = strlen(cur->value);
- /* Deal with '*' wildcard */
- if (cur->value[len - 1] == '*') {
- len--;
- iswild = 1;
- } else
- iswild = 0;
- if (strncmp(cur->value, *ep, len) == 0 &&
- (iswild || (*ep)[len] == '=') &&
- strpbrk(*ep, "/%")) {
- okvar = 0;
- }
- }
+ /*
+ * First check variables against the blacklist in env_delete.
+ * If no match there check for '%' and '/' characters.
+ */
+ okvar = matches_env_delete(*ep) != TRUE;
+ if (okvar)
+ okvar = matches_env_check(*ep) != FALSE;
if (okvar) {
if (strncmp(*ep, "SUDO_PS1=", 9) == 0)
ps1 = *ep + 5;
else if (strncmp(*ep, "PATH=", 5) == 0)
- didvar |= DID_PATH;
+ SET(didvar, DID_PATH);
else if (strncmp(*ep, "TERM=", 5) == 0)
- didvar |= DID_TERM;
- *nep++ = *ep;
+ 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_setenv("PATH", def_secure_path, TRUE);
+ SET(didvar, DID_PATH);
+ }
+
+ /* Set $USER, $LOGNAME and $USERNAME to target if "set_logname" is true. */
+ if (def_set_logname && !ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
+ if (!ISSET(didvar, KEPT_LOGNAME))
+ sudo_setenv("LOGNAME", runas_pw->pw_name, TRUE);
+ if (!ISSET(didvar, KEPT_USER))
+ sudo_setenv("USER", runas_pw->pw_name, TRUE);
+ if (!ISSET(didvar, KEPT_USERNAME))
+ sudo_setenv("USERNAME", runas_pw->pw_name, TRUE);
+ }
+
+ /* Set $HOME to target user if not preserving user's value. */
+ if (reset_home)
+ sudo_setenv("HOME", runas_pw->pw_dir, TRUE);
+
/* Provide default values for $TERM and $PATH if they are not set. */
- if (!(didvar & DID_TERM))
- *nep++ = "TERM=unknown";
- if (!(didvar & DID_PATH))
- *nep++ = format_env("PATH", _PATH_DEFPATH);
- *nep = NULL;
+ if (!ISSET(didvar, DID_TERM))
+ sudo_putenv("TERM=unknown", FALSE, FALSE);
+ if (!ISSET(didvar, DID_PATH))
+ sudo_setenv("PATH", _PATH_STDPATH, FALSE);
/*
- * At this point we must use insert_env() to modify newenvp.
- * Access via 'nep' is not allowed (since we must check for dupes).
+ * Preload a noexec file? For a list of LD_PRELOAD-alikes, see
+ * http://www.fortran-2000.com/ArnaudRecipes/sharedlib.html
+ * XXX - should prepend to original value, if any
*/
-
-#ifdef SECURE_PATH
- /* Replace the PATH envariable with a secure one. */
- insert_env(newenvp, format_env("PATH", SECURE_PATH));
-#endif
-
- /* Set $USER and $LOGNAME to target if "set_logname" is true. */
- if (def_flag(I_SET_LOGNAME) && runas_pw->pw_name) {
- insert_env(newenvp, format_env("LOGNAME", runas_pw->pw_name));
- insert_env(newenvp, format_env("USER", runas_pw->pw_name));
+ if (noexec && def_noexec_file != NULL) {
+#if defined(__darwin__) || defined(__APPLE__)
+ sudo_setenv("DYLD_INSERT_LIBRARIES", def_noexec_file, TRUE);
+ sudo_setenv("DYLD_FORCE_FLAT_NAMESPACE", "", TRUE);
+#else
+# if defined(__osf__) || defined(__sgi)
+ easprintf(&cp, "%s:DEFAULT", def_noexec_file);
+ sudo_setenv("_RLD_LIST", cp, TRUE);
+ efree(cp);
+# else
+# ifdef _AIX
+ sudo_setenv("LDR_PRELOAD", def_noexec_file, TRUE);
+# else
+ sudo_setenv("LD_PRELOAD", def_noexec_file, TRUE);
+# endif /* _AIX */
+# endif /* __osf__ || __sgi */
+#endif /* __darwin__ || __APPLE__ */
}
- /* Set $HOME for `sudo -H'. Only valid at PERM_RUNAS. */
- if ((sudo_mode & MODE_RESET_HOME) && runas_pw->pw_dir)
- insert_env(newenvp, format_env("HOME", runas_pw->pw_dir));
-
/* Set PS1 if SUDO_PS1 is set. */
- if (ps1)
- insert_env(newenvp, ps1);
+ if (ps1 != NULL)
+ sudo_putenv(ps1, TRUE, TRUE);
/* Add the SUDO_COMMAND envariable (cmnd + args). */
if (user_args) {
- easprintf(&cp, "SUDO_COMMAND=%s %s", user_cmnd, user_args);
- insert_env(newenvp, cp);
- } else
- insert_env(newenvp, format_env("SUDO_COMMAND", user_cmnd));
+ easprintf(&cp, "%s %s", user_cmnd, user_args);
+ sudo_setenv("SUDO_COMMAND", cp, TRUE);
+ efree(cp);
+ } else {
+ sudo_setenv("SUDO_COMMAND", user_cmnd, TRUE);
+ }
/* Add the SUDO_USER, SUDO_UID, SUDO_GID environment variables. */
- insert_env(newenvp, format_env("SUDO_USER", user_name));
- easprintf(&cp, "SUDO_UID=%ld", (long) user_uid);
- insert_env(newenvp, cp);
- easprintf(&cp, "SUDO_GID=%ld", (long) user_gid);
- insert_env(newenvp, cp);
-
- return(newenvp);
+ sudo_setenv("SUDO_USER", user_name, TRUE);
+ snprintf(idbuf, sizeof(idbuf), "%lu", (unsigned long) user_uid);
+ sudo_setenv("SUDO_UID", idbuf, TRUE);
+ snprintf(idbuf, sizeof(idbuf), "%lu", (unsigned long) user_gid);
+ sudo_setenv("SUDO_GID", idbuf, TRUE);
+
+ /* Free old environment. */
+ efree(old_envp);
}
void
-dump_badenv()
+insert_env_vars(env_vars)
+ struct list_member *env_vars;
{
struct list_member *cur;
- puts("Default table of environment variables to clear");
- for (cur = def_list(I_ENV_DELETE); cur; cur = cur->next)
- printf("\t%s\n", cur->value);
+ /* Add user-specified environment variables. */
+ for (cur = env_vars; cur != NULL; cur = cur->next)
+ putenv(cur->value);
+}
- puts("Default table of environment variables to sanity check");
- for (cur = def_list(I_ENV_CHECK); cur; cur = cur->next)
- printf("\t%s\n", cur->value);
+/*
+ * Validate the list of environment variables passed in on the command
+ * line against env_delete, env_check, and env_keep.
+ * Calls log_error() if any specified variables are not allowed.
+ */
+void
+validate_env_vars(env_vars)
+ struct list_member *env_vars;
+{
+ struct list_member *var;
+ char *eq, *bad = NULL;
+ size_t len, blen = 0, bsize = 0;
+ int okvar;
+
+ /* Add user-specified environment variables. */
+ for (var = env_vars; var != NULL; var = var->next) {
+ if (def_secure_path && !user_is_exempt() &&
+ strncmp(var->value, "PATH=", 5) == 0) {
+ okvar = FALSE;
+ } else if (def_env_reset) {
+ okvar = matches_env_check(var->value);
+ if (okvar == -1)
+ okvar = matches_env_keep(var->value);
+ } else {
+ okvar = matches_env_delete(var->value) == FALSE;
+ if (okvar == FALSE)
+ okvar = matches_env_check(var->value) != FALSE;
+ }
+ if (okvar == FALSE) {
+ /* Not allowed, add to error string, allocating as needed. */
+ if ((eq = strchr(var->value, '=')) != NULL)
+ *eq = '\0';
+ len = strlen(var->value) + 2;
+ if (blen + len >= bsize) {
+ do {
+ bsize += 1024;
+ } while (blen + len >= bsize);
+ bad = erealloc(bad, bsize);
+ bad[blen] = '\0';
+ }
+ strlcat(bad, var->value, bsize);
+ strlcat(bad, ", ", bsize);
+ blen += len;
+ if (eq != NULL)
+ *eq = '=';
+ }
+ }
+ if (bad != NULL) {
+ bad[blen - 2] = '\0'; /* remove trailing ", " */
+ log_error(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(path, overwrite)
+ 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()
{
struct list_member *cur;
- char **p;
+ const char **p;
- /* Fill in "env_delete" variable. */
+ /* Fill in the "env_delete" list. */
for (p = initial_badenv_table; *p; p++) {
cur = emalloc(sizeof(struct list_member));
cur->value = estrdup(*p);
- cur->next = def_list(I_ENV_DELETE);
- def_list(I_ENV_DELETE) = cur;
+ cur->next = def_env_delete;
+ def_env_delete = cur;
}
- /* Fill in "env_check" variable. */
+ /* Fill in the "env_check" list. */
for (p = initial_checkenv_table; *p; p++) {
cur = emalloc(sizeof(struct list_member));
cur->value = estrdup(*p);
- cur->next = def_list(I_ENV_CHECK);
- def_list(I_ENV_CHECK) = cur;
+ cur->next = def_env_check;
+ def_env_check = cur;
+ }
+
+ /* Fill in the "env_keep" list. */
+ for (p = initial_keepenv_table; *p; p++) {
+ cur = emalloc(sizeof(struct list_member));
+ cur->value = estrdup(*p);
+ cur->next = def_env_keep;
+ def_env_keep = cur;
}
}
projects / debian / sudo / blobdiff