shadow/libmisc/setupenv.c
2008-05-25 23:50:03 +00:00

292 lines
7.4 KiB
C

/*
* Copyright (c) 1989 - 1994, Julianne Frances Haugh
* Copyright (c) 1996 - 2000, Marek Michałkiewicz
* Copyright (c) 2001 - 2006, Tomasz Kłoczko
* Copyright (c) 2007 , Nicolas François
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 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 copyright holders or contributors may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``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 COPYRIGHT
* HOLDERS OR CONTRIBUTORS 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.
*/
/*
* Separated from setup.c. --marekm
*/
#include <config.h>
#ident "$Id$"
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <ctype.h>
#include "prototypes.h"
#include "defines.h"
#include <pwd.h>
#include "getdef.h"
#ifndef USE_PAM
static void
addenv_path (const char *varname, const char *dirname, const char *filename)
{
char *buf;
buf = xmalloc (strlen (dirname) + strlen (filename) + 2);
sprintf (buf, "%s/%s", dirname, filename);
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 (!fp)
return;
while (fgets (buf, sizeof buf, fp) == buf) {
cp = strrchr (buf, '\n');
if (!cp)
break;
*cp = '\0';
cp = buf;
/* ignore whitespace and comments */
while (*cp && isspace (*cp))
cp++;
if (*cp == '\0' || *cp == '#')
continue;
/*
* ignore lines which don't follow the name=value format
* (for example, the "export NAME" shell commands)
*/
name = cp;
while (*cp && !isspace (*cp) && *cp != '=')
cp++;
if (*cp != '=')
continue;
/* NUL-terminate the name */
*cp++ = '\0';
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;
}
eise 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);
}
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
char *envf;
#endif
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 (stderr, _("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 (1);
}
puts (_("No directory, logging in with HOME=/"));
info->pw_dir = 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[] = "/bin/sh";
info->pw_shell = 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 (!cp) {
/* not specified, use a minimal default */
addenv ("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")) {
if ((cp = getdef_str ("MAIL_DIR")))
addenv_path ("MAIL", cp, info->pw_name);
else if ((cp = getdef_str ("MAIL_FILE")))
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
*/
if ((envf = getdef_str ("ENVIRON_FILE")))
read_env_file (envf);
#endif /* !USE_PAM */
}