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/* vi: set sw=4 ts=4: */
/*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
#include <syslog.h>
static char* new_password( int algo, char *pass)
{
char salt[sizeof("$N$XXXXXXXX")]; /* "$N$XXXXXXXX" or "XX" */
char *ret = NULL; /* failure so far */
crypt_make_salt(salt, 1, 0); /* des */
if (algo) { /* MD5 */
strcpy(salt, "$1$");
crypt_make_salt(salt + 3, 4, 0);
}
/* pw_encrypt returns malloced str */
ret = pw_encrypt(pass, salt, 1);
/* whee, success! */
return ret;
}
int passwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int passwd_main(int argc UNUSED_PARAM, char **argv)
{
enum {
OPT_algo = 0x1, /* -a - password algorithm */
OPT_lock = 0x2, /* -l - lock account */
OPT_unlock = 0x4, /* -u - unlock account */
OPT_delete = 0x8, /* -d - delete password */
OPT_lud = 0xe,
STATE_ALGO_md5 = 0x10,
//STATE_ALGO_des = 0x20, not needed yet
};
unsigned opt;
int rc;
const char *opt_a = "";
const char *filename;
char *myname;
char *name;
char *newp;
char *pass;
struct passwd *pw;
uid_t myuid;
struct rlimit rlimit_fsize;
#if ENABLE_FEATURE_SHADOWPASSWDS
/* Using _r function to avoid pulling in static buffers */
struct spwd spw;
char buffer[256];
#endif
logmode = LOGMODE_BOTH;
openlog(applet_name, LOG_NOWAIT, LOG_AUTH);
opt = getopt32(argv, "a:lud", &opt_a);
//argc -= optind;
argv += optind;
if (strcasecmp(opt_a, "des") != 0) /* -a */
opt |= STATE_ALGO_md5;
//else
// opt |= STATE_ALGO_des;
myuid = getuid();
/* -l, -u, -d require root priv and username argument */
if ((opt & OPT_lud) && (myuid || !argv[0]))
bb_show_usage();
/* Will complain and die if username not found */
myname = xstrdup(bb_getpwuid(NULL, -1, myuid));
if( argc<3 ) {
bb_error_msg_and_die("You should supply a name ans a password");
}
name = argv[0];
pass = argv[1];
pw = getpwnam(name);
if (!pw)
bb_error_msg_and_die("unknown user %s", name);
if (myuid && pw->pw_uid != myuid) {
/* LOGMODE_BOTH */
bb_error_msg_and_die("%s can't change password for %s", myname, name);
}
newp = new_password( opt & STATE_ALGO_md5, pass);
#if ENABLE_FEATURE_SHADOWPASSWDS
{
/* getspnam_r may return 0 yet set result to NULL.
* At least glibc 2.4 does this. Be extra paranoid here. */
struct spwd *result = NULL;
if (getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result)
|| !result || strcmp(result->sp_namp, pw->pw_name) != 0) {
/* LOGMODE_BOTH */
bb_error_msg("no record of %s in %s, using %s",
name, bb_path_shadow_file,
bb_path_passwd_file);
} else {
pw->pw_passwd = result->sp_pwdp;
}
}
#endif
rlimit_fsize.rlim_cur = rlimit_fsize.rlim_max = 512L * 30000;
setrlimit(RLIMIT_FSIZE, &rlimit_fsize);
bb_signals(0
+ (1 << SIGHUP)
+ (1 << SIGINT)
+ (1 << SIGQUIT)
, SIG_IGN);
umask(077);
xsetuid(0);
#if ENABLE_FEATURE_SHADOWPASSWDS
filename = bb_path_shadow_file;
rc = update_passwd(bb_path_shadow_file, name, newp );
if (rc == 0) /* no lines updated, no errors detected */
#endif
{
filename = bb_path_passwd_file;
rc = update_passwd(bb_path_passwd_file, name, newp);
}
/* LOGMODE_BOTH */
if (rc < 0)
bb_error_msg_and_die("cannot update password file %s",
filename);
bb_info_msg("Password for %s changed by %s", name, myname);
//if (ENABLE_FEATURE_CLEAN_UP) free(newp);
if (!newp) {
bb_error_msg_and_die("password for %s is already %slocked",
name, (opt & OPT_unlock) ? "un" : "");
}
if (ENABLE_FEATURE_CLEAN_UP) free(myname);
return 0;
}
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