#include <config.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#else
# ifdef HAVE_STRINGS_H
# include <strings.h>
# endif
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <pwd.h>
#include "sudo.h"
#ifndef lint
__unused static const char rcsid[] = "$Sudo: env.c,v 1.94 2008/11/09 14:13:12 millert Exp $";
#endif
#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_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_MAX
#define KEPT_MAX 0xff00
#undef VNULL
#define VNULL (void *)NULL
struct environment {
char **envp;
size_t env_size;
size_t env_len;
};
void rebuild_env __P((int, int));
void sudo_setenv __P((const char *, const char *, int));
void sudo_unsetenv __P((const char *));
static void _sudo_setenv __P((const char *, const char *, int));
static void insert_env __P((char *, int, int));
static void sync_env __P((void));
extern char **environ;
static struct environment env;
static const char *initial_badenv_table[] = {
"IFS",
"CDPATH",
"LOCALDOMAIN",
"RES_OPTIONS",
"HOSTALIASES",
"NLSPATH",
"PATH_LOCALE",
"LD_*",
"_RLD*",
#ifdef __hpux
"SHLIB_PATH",
#endif
#ifdef _AIX
"LDR_*",
"LIBPATH",
"AUTHSTATE",
#endif
#ifdef __APPLE__
"DYLD_*",
#endif
#ifdef HAVE_KERB4
"KRB_CONF*",
"KRBCONFDIR",
"KRBTKFILE",
#endif
#ifdef HAVE_KERB5
"KRB5_CONFIG*",
"KRB5_KTNAME",
#endif
#ifdef HAVE_SECURID
"VAR_ACE",
"USR_ACE",
"DLC_ACE",
#endif
"TERMINFO",
"TERMINFO_DIRS",
"TERMPATH",
"TERMCAP",
"ENV",
"BASH_ENV",
"PS4",
"GLOBIGNORE",
"SHELLOPTS",
"JAVA_TOOL_OPTIONS",
"PERLIO_DEBUG ",
"PERLLIB",
"PERL5LIB",
"PERL5OPT",
"PERL5DB",
"FPATH",
"NULLCMD",
"READNULLCMD",
"ZDOTDIR",
"TMPPREFIX",
"PYTHONHOME",
"PYTHONPATH",
"PYTHONINSPECT",
"RUBYLIB",
"RUBYOPT",
NULL
};
static const char *initial_checkenv_table[] = {
"COLORTERM",
"LANG",
"LANGUAGE",
"LC_*",
"LINGUAS",
"TERM",
NULL
};
static const char *initial_keepenv_table[] = {
"COLORS",
"DISPLAY",
"HOME",
"HOSTNAME",
"KRB5CCNAME",
"LS_COLORS",
"MAIL",
"PATH",
"PS1",
"PS2",
"TZ",
"XAUTHORITY",
"XAUTHORIZATION",
NULL
};
static void
sync_env()
{
size_t evlen;
char **ep;
for (ep = environ; *ep != NULL; ep++)
continue;
evlen = ep - environ;
if (evlen + 1 > env.env_size) {
efree(env.envp);
env.env_size = evlen + 1 + 128;
env.envp = emalloc2(env.env_size, sizeof(char *));
}
memcpy(env.envp, environ, (evlen + 1) * sizeof(char *));
env.env_len = evlen;
environ = env.envp;
}
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);
if (strlcpy(estring, var, esize) >= esize ||
strlcat(estring, "=", esize) >= esize ||
strlcat(estring, val, esize) >= esize) {
errorx(1, "internal error, sudo_setenv() overflow");
}
insert_env(estring, dupcheck, FALSE);
}
#ifdef HAVE_LDAP
void
sudo_setenv(var, val, dupcheck)
const char *var;
const char *val;
int dupcheck;
{
char *estring;
size_t esize;
if (env.envp != environ)
sync_env();
esize = strlen(var) + 1 + strlen(val) + 1;
estring = emalloc(esize);
if (strlcpy(estring, var, esize) >= esize ||
strlcat(estring, "=", esize) >= esize ||
strlcat(estring, val, esize) >= esize) {
errorx(1, "internal error, sudo_setenv() overflow");
}
insert_env(estring, dupcheck, TRUE);
}
#endif
#if defined(HAVE_LDAP) || defined(HAVE_AIXAUTH)
void
sudo_unsetenv(var)
const char *var;
{
char **nep;
size_t varlen;
if (env.envp != environ)
sync_env();
varlen = strlen(var);
for (nep = env.envp; *nep; nep++) {
if (strncmp(var, *nep, varlen) == 0 && (*nep)[varlen] == '=') {
memmove(nep, nep + 1,
(env.env_len - (nep - env.envp)) * sizeof(char *));
env.env_len--;
return;
}
}
}
#endif
static void
insert_env(str, dupcheck, dosync)
char *str;
int dupcheck;
int dosync;
{
char **nep;
size_t varlen;
if (env.env_len + 2 > env.env_size) {
env.env_size += 128;
env.envp = erealloc3(env.envp, env.env_size, sizeof(char *));
if (dosync)
environ = env.envp;
}
if (dupcheck) {
varlen = (strchr(str, '=') - str) + 1;
for (nep = env.envp; *nep; nep++) {
if (strncmp(str, *nep, varlen) == 0) {
if (dupcheck != -1)
*nep = str;
return;
}
}
} else
nep = env.envp + env.env_len;
env.env_len++;
*nep++ = str;
*nep = NULL;
}
static int
matches_env_delete(var)
const char *var;
{
struct list_member *cur;
size_t len;
int iswild, match = FALSE;
for (cur = def_env_delete; cur; cur = cur->next) {
len = strlen(cur->value);
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);
}
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);
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);
}
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);
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);
}
void
rebuild_env(sudo_mode, noexec)
int sudo_mode;
int noexec;
{
char **old_envp, **ep, *cp, *ps1;
char idbuf[MAX_UID_T_LEN];
unsigned int didvar;
ps1 = NULL;
didvar = 0;
env.env_len = 0;
env.env_size = 128;
old_envp = env.envp;
env.envp = emalloc2(env.env_size, sizeof(char *));
if (def_env_reset || ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
for (ep = environ; *ep; ep++) {
int keepit;
if ((cp = strchr(*ep, '=')) != NULL) {
if (strncmp(cp, "=() ", 3) == 0)
continue;
}
keepit = matches_env_check(*ep);
if (keepit == -1)
keepit = matches_env_keep(*ep);
if (strncmp(*ep, "SUDO_PS1=", 8) == 0)
ps1 = *ep + 5;
if (keepit) {
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 '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;
}
insert_env(*ep, FALSE, FALSE);
}
}
didvar |= didvar << 8;
if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
_sudo_setenv("HOME", runas_pw->pw_dir, ISSET(didvar, DID_HOME));
_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_HOME))
_sudo_setenv("HOME", user_dir, FALSE);
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);
}
} else {
for (ep = environ; *ep; ep++) {
int okvar;
if ((cp = strchr(*ep, '=')) != NULL) {
if (strncmp(cp, "=() ", 3) == 0)
continue;
}
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)
SET(didvar, DID_PATH);
else if (strncmp(*ep, "TERM=", 5) == 0)
SET(didvar, DID_TERM);
insert_env(*ep, FALSE, FALSE);
}
}
}
if (def_secure_path && !user_is_exempt()) {
_sudo_setenv("PATH", def_secure_path, TRUE);
SET(didvar, DID_PATH);
}
if (def_set_logname && runas_pw->pw_name) {
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);
}
if (runas_pw->pw_dir) {
if (ISSET(sudo_mode, MODE_RESET_HOME) ||
(ISSET(sudo_mode, MODE_RUN) && (def_always_set_home ||
(ISSET(sudo_mode, MODE_SHELL) && def_set_home))))
_sudo_setenv("HOME", runas_pw->pw_dir, TRUE);
}
if (!ISSET(didvar, DID_TERM))
insert_env("TERM=unknown", FALSE, FALSE);
if (!ISSET(didvar, DID_PATH))
_sudo_setenv("PATH", _PATH_DEFPATH, FALSE);
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
# endif
#endif
}
if (ps1 != NULL)
insert_env(ps1, TRUE, FALSE);
if (user_args) {
easprintf(&cp, "%s %s", user_cmnd, user_args);
_sudo_setenv("SUDO_COMMAND", cp, TRUE);
efree(cp);
} else
_sudo_setenv("SUDO_COMMAND", user_cmnd, TRUE);
_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);
environ = env.envp;
efree(old_envp);
}
void
insert_env_vars(env_vars)
struct list_member *env_vars;
{
struct list_member *cur;
if (env_vars == NULL)
return;
if (env.envp != environ)
sync_env();
for (cur = env_vars; cur != NULL; cur = cur->next)
insert_env(cur->value, TRUE, TRUE);
}
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;
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) {
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';
log_error(NO_MAIL,
"sorry, you are not allowed to set the following environment variables: %s", bad);
efree(bad);
}
}
void
read_env_file(path, replace)
const char *path;
int replace;
{
FILE *fp;
char *cp;
if ((fp = fopen(path, "r")) == NULL)
return;
if (env.envp != environ)
sync_env();
while ((cp = sudo_parseln(fp)) != NULL) {
if (*cp == '\0')
continue;
if (strchr(cp, '=') == NULL)
continue;
insert_env(estrdup(cp), replace ? TRUE : -1, TRUE);
}
fclose(fp);
}
void
init_envtables()
{
struct list_member *cur;
const char **p;
for (p = initial_badenv_table; *p; p++) {
cur = emalloc(sizeof(struct list_member));
cur->value = estrdup(*p);
cur->next = def_env_delete;
def_env_delete = cur;
}
for (p = initial_checkenv_table; *p; p++) {
cur = emalloc(sizeof(struct list_member));
cur->value = estrdup(*p);
cur->next = def_env_check;
def_env_check = cur;
}
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;
}
}