shadow/libmisc/setupenv.c

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/*
* SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
* SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
* SPDX-FileCopyrightText: 2001 - 2006, Tomasz Kłoczko
* SPDX-FileCopyrightText: 2007 - 2010, Nicolas François
*
* SPDX-License-Identifier: BSD-3-Clause
*/
/*
* Separated from setup.c. --marekm
*/
#include <config.h>
#ident "$Id$"
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <ctype.h>
#include "alloc.h"
#include "prototypes.h"
#include "defines.h"
#include <pwd.h>
#include "getdef.h"
#include "shadowlog.h"
#ifndef USE_PAM
static void
addenv_path (const char *varname, const char *dirname, const char *filename)
{
char *buf;
size_t len = strlen (dirname) + strlen (filename) + 2;
int wlen;
buf = XMALLOCARRAY (len, char);
wlen = snprintf (buf, len, "%s/%s", dirname, filename);
assert (wlen == (int) len - 1);
addenv (varname, buf);
free (buf);
}
static void read_env_file (const char *filename)
{
FILE *fp;
char buf[1024];
char *cp, *name, *val;
fp = fopen (filename, "r");
if (NULL == fp) {
return;
}
* libmisc/limits.c: Avoid implicit conversion of integer to boolean. * libmisc/basename.c: Avoid implicit conversion of pointer to boolean. * libmisc/basename.c, lib/prototypes.h (Basename): Return a constant string. * libmisc/basename.c, libmisc/obscure.c, lib/prototypes.h, libmisc/xmalloc.c, libmisc/getdate.h, libmisc/system.c, libmisc/getgr_nam_gid.c, libmisc/failure.c, libmisc/valid.c: Add splint annotations. * libmisc/chowndir.c: Avoid memory leak. * libmisc/chowndir.c: Do not check *printf/*puts return value. * libmisc/chowntty.c: Avoid implicit conversion between integer types. * libmisc/obscure.c: Return a bool when possible instead of int. * libmisc/shell.c: Do not check *printf/*puts return value. * libmisc/shell.c: Do not check execle return value. * libmisc/setupenv.c: Avoid implicit conversion between integer types. * libmisc/xmalloc.c: size should not be zero to avoid returning NULL pointers. * libmisc/hushed.c: Do not check *printf/*puts return value. * libmisc/system.c: Avoid implicit conversion of integer to boolean. safe_system last argument is a boolean. * libmisc/system.c: Check return value of dup2. * libmisc/system.c: Do not check *printf/*puts return value. * libmisc/system.c: Do not check execve return value. * libmisc/salt.c: Do not check *printf/*puts return value. * libmisc/loginprompt.c: Do not check gethostname return value. * libmisc/find_new_gid.c, libmisc/find_new_uid.c: Do not check gr_rewind/pw_rewind return value. * libmisc/ttytype.c: Limit the number of parsed characters in the sscanf format. * libmisc/ttytype.c: Test if a type was really read. * libmisc/sub.c: Do not check *printf/*puts return value. * libmisc/sub.c: Avoid implicit conversion of integer to boolean. * src/userdel.c: Fix typo in comment. * src/userdel.c: Avoid implicit conversion of boolean to integer. * src/userdel.c: safe_system last argument is a boolean. * src/newusers.c: Avoid implicit conversion of boolean to integer. * src/newusers.c: Avoid implicit conversion of integer to boolean. * src/usermod.c: Add brackets. * src/usermod.c: Avoid implicit conversion of characters or integers to booleans. * src/vipw.c: Avoid implicit conversion of integer to boolean. * src/su.c: Avoid implicit conversion of integer to boolean. * src/su.c: Add brackets. * src/useradd.c: Avoid implicit conversion of characters or integers to booleans.
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while (fgets (buf, (int)(sizeof buf), fp) == buf) {
cp = strrchr (buf, '\n');
if (NULL == cp) {
break;
}
*cp = '\0';
cp = buf;
/* ignore whitespace and comments */
while (('\0' != *cp) && isspace (*cp)) {
cp++;
}
if (('\0' == *cp) || ('#' == *cp)) {
continue;
}
/*
* ignore lines which don't follow the name=value format
* (for example, the "export NAME" shell commands)
*/
name = cp;
while (('\0' != *cp) && !isspace (*cp) && ('=' != *cp)) {
cp++;
}
if ('=' != *cp) {
continue;
}
/* NUL-terminate the name */
*cp = '\0';
cp++;
val = cp;
#if 0 /* XXX untested, and needs rewrite with fewer goto's :-) */
/*
(state, char_type) -> (state, action)
state: unquoted, single_quoted, double_quoted, escaped, double_quoted_escaped
char_type: normal, white, backslash, single, double
action: remove_curr, remove_curr_skip_next, remove_prev, finish XXX
*/
no_quote:
if (*cp == '\\') {
/* remove the backslash */
remove_char (cp);
/* skip over the next character */
if (*cp)
cp++;
goto no_quote;
} else if (*cp == '\'') {
/* remove the quote */
remove_char (cp);
/* now within single quotes */
goto s_quote;
} else if (*cp == '"') {
/* remove the quote */
remove_char (cp);
/* now within double quotes */
goto d_quote;
} else if (*cp == '\0') {
/* end of string */
goto finished;
} else if (isspace (*cp)) {
/* unescaped whitespace - end of string */
*cp = '\0';
goto finished;
} else {
cp++;
goto no_quote;
}
s_quote:
if (*cp == '\'') {
/* remove the quote */
remove_char (cp);
/* unquoted again */
goto no_quote;
} else if (*cp == '\0') {
/* end of string */
goto finished;
} else {
/* preserve everything within single quotes */
cp++;
goto s_quote;
}
d_quote:
if (*cp == '\"') {
/* remove the quote */
remove_char (cp);
/* unquoted again */
goto no_quote;
} else if (*cp == '\\') {
cp++;
/* if backslash followed by double quote, remove backslash
else skip over the backslash and following char */
if (*cp == '"')
remove_char (cp - 1);
else if (*cp)
cp++;
goto d_quote;
}
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else if (*cp == '\0') {
/* end of string */
goto finished;
} else {
/* preserve everything within double quotes */
goto d_quote;
}
finished:
#endif /* 0 */
/*
* XXX - should handle quotes, backslash escapes, etc.
* like the shell does.
*/
addenv (name, val);
}
(void) fclose (fp);
}
#endif /* USE_PAM */
/*
* change to the user's home directory
* set the HOME, SHELL, MAIL, PATH, and LOGNAME or USER environmental
* variables.
*/
void setup_env (struct passwd *info)
{
#ifndef USE_PAM
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const char *envf;
#endif
const char *cp;
/*
* Change the current working directory to be the home directory
* of the user. It is a fatal error for this process to be unable
* to change to that directory. There is no "default" home
* directory.
*
* We no longer do it as root - should work better on NFS-mounted
* home directories. Some systems default to HOME=/, so we make
* this a configurable option. --marekm
*/
if (chdir (info->pw_dir) == -1) {
static char temp_pw_dir[] = "/";
if (!getdef_bool ("DEFAULT_HOME") || chdir ("/") == -1) {
fprintf (log_get_logfd(), _("Unable to cd to '%s'\n"),
info->pw_dir);
SYSLOG ((LOG_WARN,
"unable to cd to `%s' for user `%s'\n",
info->pw_dir, info->pw_name));
closelog ();
exit (EXIT_FAILURE);
}
(void) puts (_("No directory, logging in with HOME=/"));
free (info->pw_dir);
info->pw_dir = xstrdup (temp_pw_dir);
}
/*
* Create the HOME environmental variable and export it.
*/
addenv ("HOME", info->pw_dir);
/*
* Create the SHELL environmental variable and export it.
*/
if ((NULL == info->pw_shell) || ('\0' == *info->pw_shell)) {
static char temp_pw_shell[] = SHELL;
free (info->pw_shell);
info->pw_shell = xstrdup (temp_pw_shell);
}
addenv ("SHELL", info->pw_shell);
/*
* Export the user name. For BSD derived systems, it's "USER", for
* all others it's "LOGNAME". We set both of them.
*/
addenv ("USER", info->pw_name);
addenv ("LOGNAME", info->pw_name);
/*
* Create the PATH environmental variable and export it.
*/
cp = getdef_str ((info->pw_uid == 0) ? "ENV_SUPATH" : "ENV_PATH");
if (NULL == cp) {
/* not specified, use a minimal default */
addenv ((info->pw_uid == 0) ? "PATH=/sbin:/bin:/usr/sbin:/usr/bin" : "PATH=/bin:/usr/bin", NULL);
} else if (strchr (cp, '=')) {
/* specified as name=value (PATH=...) */
addenv (cp, NULL);
} else {
/* only value specified without "PATH=" */
addenv ("PATH", cp);
}
#ifndef USE_PAM
/*
* Create the MAIL environmental variable and export it. login.defs
* knows the prefix.
*/
if (getdef_bool ("MAIL_CHECK_ENAB")) {
cp = getdef_str ("MAIL_DIR");
if (NULL != cp) {
addenv_path ("MAIL", cp, info->pw_name);
} else {
cp = getdef_str ("MAIL_FILE");
if (NULL != cp) {
addenv_path ("MAIL", info->pw_dir, cp);
} else {
#if defined(MAIL_SPOOL_FILE)
addenv_path ("MAIL", info->pw_dir, MAIL_SPOOL_FILE);
#elif defined(MAIL_SPOOL_DIR)
addenv_path ("MAIL", MAIL_SPOOL_DIR, info->pw_name);
#endif
}
}
}
/*
* Read environment from optional config file. --marekm
*/
envf = getdef_str ("ENVIRON_FILE");
if (NULL != envf) {
read_env_file (envf);
}
#endif /* !USE_PAM */
}