#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>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <ctype.h>
#include <errno.h>
#include <pwd.h>
#include "sudo.h"
#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 **envp;
size_t env_size;
size_t env_len;
int owned;
};
static void sudo_setenv __P((const char *, const char *, int));
static void sudo_putenv __P((char *, int, int));
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",
"PYTHONUSERBASE",
"RUBYLIB",
"RUBYOPT",
NULL
};
static const char *initial_checkenv_table[] = {
"COLORTERM",
"LANG",
"LANGUAGE",
"LC_*",
"LINGUAS",
"TERM",
NULL
};
static const char *initial_keepenv_table[] = {
"COLORS",
"DISPLAY",
"HOSTNAME",
"KRB5CCNAME",
"LS_COLORS",
"PATH",
"PS1",
"PS2",
"TZ",
"XAUTHORITY",
"XAUTHORIZATION",
NULL
};
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) {
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 **
env_get()
{
return 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");
}
sudo_putenv(estring, dupcheck, TRUE);
}
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;
}
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);
for (cp = var; *cp && *cp != '='; cp++)
;
esize = (size_t)(cp - var) + 2;
if (val) {
esize += strlen(val);
}
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);
}
#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
len = strlen(var);
for (ep = env.envp; *ep != NULL;) {
if (strncmp(var, *ep, len) == 0 && (*ep)[len] == '=') {
char **cur = ep;
while ((*cur = *(cur + 1)) != NULL)
cur++;
} else {
ep++;
}
}
env.env_len = ep - env.envp;
#ifndef UNSETENV_VOID
return(0);
#endif
}
int
#ifdef PUTENV_CONST
putenv(const char *string)
#else
putenv(string)
char *string;
#endif
{
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);
}
static void
sudo_putenv(str, dupcheck, overwrite)
char *str;
int dupcheck;
int overwrite;
{
char **ep;
size_t len;
int found = FALSE;
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 {
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
}
#ifdef ENV_DEBUG
if (env.envp[env.env_len] != NULL)
errorx(1, "sudo_putenv: corrupted envp, len mismatch");
#endif
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;
}
}
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 (!found) {
ep = env.envp + env.env_len;
env.env_len++;
*ep++ = str;
*ep = 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(noexec)
int noexec;
{
char **old_envp, **ep, *cp, *ps1;
char idbuf[MAX_UID_T_LEN];
unsigned int didvar;
int reset_home = FALSE;
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 *));
#endif
if (def_env_reset || ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
reset_home = TRUE;
for (ep = old_envp; *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 && !ISSET(sudo_mode, MODE_RESET_HOME))
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;
}
sudo_putenv(*ep, FALSE, FALSE);
}
}
didvar |= didvar << 8;
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 (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 {
if (ISSET(sudo_mode, MODE_RUN)) {
if (def_always_set_home || ISSET(sudo_mode, MODE_RESET_HOME) ||
(ISSET(sudo_mode, MODE_SHELL) && def_set_home))
reset_home = TRUE;
}
for (ep = old_envp; *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);
sudo_putenv(*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 && !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);
}
if (reset_home && !ISSET(didvar, KEPT_HOME))
sudo_setenv("HOME", runas_pw->pw_dir, TRUE);
if (!ISSET(didvar, DID_TERM))
sudo_putenv("TERM=unknown", FALSE, FALSE);
if (!ISSET(didvar, DID_PATH))
sudo_setenv("PATH", _PATH_STDPATH, 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)
sudo_putenv(ps1, TRUE, TRUE);
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);
efree(old_envp);
}
void
insert_env_vars(env_vars)
struct list_member *env_vars;
{
struct list_member *cur;
for (cur = env_vars; cur != NULL; cur = cur->next)
putenv(cur->value);
}
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, 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) {
if (*var == '\0')
continue;
if (strncmp(var, "export", 6) == 0 && isspace((unsigned char) var[6])) {
var += 7;
while (isspace((unsigned char) *var)) {
var++;
}
}
for (val = var; *val != '\0' && *val != '='; val++)
;
if (var == val || *val != '=')
continue;
var_len = (size_t)(val - var);
val_len = strlen(++val);
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);
memcpy(cp + var_len + 1, val, val_len + 1);
sudo_putenv(cp, TRUE, overwrite);
}
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;
}
}