/* vi: set sw=4 ts=4: */
/*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//usage:#define passwd_trivial_usage
+//usage: "[OPTIONS] [USER]"
+//usage:#define passwd_full_usage "\n\n"
+//usage: "Change USER's password (default: current user)"
+//usage: "\n"
+//usage: "\n -a ALG Encryption method"
+//usage: "\n -d Set password to ''"
+//usage: "\n -l Lock (disable) account"
+//usage: "\n -u Unlock (enable) account"
+
#include "libbb.h"
#include <syslog.h>
-
+#include <sys/resource.h> /* setrlimit */
static void nuke_str(char *str)
{
if (str) memset(str, 0, strlen(str));
}
-static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
+static char* new_password(const struct passwd *pw, uid_t myuid, const char *algo)
{
- char salt[sizeof("$N$XXXXXXXX")]; /* "$N$XXXXXXXX" or "XX" */
+ char salt[MAX_PW_SALT_LEN];
char *orig = (char*)"";
char *newp = NULL;
- char *cipher = NULL;
char *cp = NULL;
char *ret = NULL; /* failure so far */
- if (myuid && pw->pw_passwd[0]) {
- orig = bb_askpass(0, "Old password:"); /* returns ptr to static */
+ if (myuid != 0 && pw->pw_passwd[0]) {
+ char *encrypted;
+
+ orig = bb_ask_stdin("Old password: "); /* returns ptr to static */
if (!orig)
goto err_ret;
- cipher = pw_encrypt(orig, pw->pw_passwd); /* returns ptr to static */
- if (strcmp(cipher, pw->pw_passwd) != 0) {
- syslog(LOG_WARNING, "incorrect password for '%s'",
- pw->pw_name);
- bb_do_delay(FAIL_DELAY);
+ encrypted = pw_encrypt(orig, pw->pw_passwd, 1); /* returns malloced str */
+ if (strcmp(encrypted, pw->pw_passwd) != 0) {
+ syslog(LOG_WARNING, "incorrect password for %s", pw->pw_name);
+ bb_do_delay(LOGIN_FAIL_DELAY);
puts("Incorrect password");
goto err_ret;
}
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(encrypted);
}
- orig = xstrdup(orig); /* or else bb_askpass() will destroy it */
- newp = bb_askpass(0, "New password:"); /* returns ptr to static */
+ orig = xstrdup(orig); /* or else bb_ask_stdin() will destroy it */
+ newp = bb_ask_stdin("New password: "); /* returns ptr to static */
if (!newp)
goto err_ret;
- newp = xstrdup(newp); /* we are going to bb_askpass() again, so save it */
+ newp = xstrdup(newp); /* we are going to bb_ask_stdin() again, so save it */
if (ENABLE_FEATURE_PASSWD_WEAK_CHECK
- && obscure(orig, newp, pw) && myuid)
+ && obscure(orig, newp, pw)
+ && myuid != 0
+ ) {
goto err_ret; /* non-root is not allowed to have weak passwd */
+ }
- cp = bb_askpass(0, "Retype password:");
+ cp = bb_ask_stdin("Retype password: ");
if (!cp)
goto err_ret;
- if (strcmp(cp, newp)) {
+ if (strcmp(cp, newp) != 0) {
puts("Passwords don't match");
goto err_ret;
}
- crypt_make_salt(salt, 1, 0); /* des */
- if (algo) { /* MD5 */
- strcpy(salt, "$1$");
- crypt_make_salt(salt + 3, 4, 0);
- }
- /* pw_encrypt returns ptr to static */
- ret = xstrdup(pw_encrypt(newp, salt));
+ crypt_make_pw_salt(salt, algo);
+
+ /* pw_encrypt returns malloced str */
+ ret = pw_encrypt(newp, salt, 1);
/* whee, success! */
err_ret:
nuke_str(orig);
if (ENABLE_FEATURE_CLEAN_UP) free(orig);
+
nuke_str(newp);
if (ENABLE_FEATURE_CLEAN_UP) free(newp);
- nuke_str(cipher);
+
nuke_str(cp);
return ret;
}
int passwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int passwd_main(int argc, char **argv)
+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
+ OPT_algo = (1 << 0), /* -a - password algorithm */
+ OPT_lock = (1 << 1), /* -l - lock account */
+ OPT_unlock = (1 << 2), /* -u - unlock account */
+ OPT_delete = (1 << 3), /* -d - delete password */
+ OPT_lud = OPT_lock | OPT_unlock | OPT_delete,
};
unsigned opt;
int rc;
- const char *opt_a = "";
+ const char *opt_a = CONFIG_FEATURE_DEFAULT_PASSWD_ALGO;
const char *filename;
char *myname;
char *name;
uid_t myuid;
struct rlimit rlimit_fsize;
char c;
-
#if ENABLE_FEATURE_SHADOWPASSWDS
/* Using _r function to avoid pulling in static buffers */
struct spwd spw;
- struct spwd *result;
char buffer[256];
#endif
logmode = LOGMODE_BOTH;
- openlog(applet_name, LOG_NOWAIT, LOG_AUTH);
+ openlog(applet_name, 0, 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]))
+ if ((opt & OPT_lud) && (myuid != 0 || !argv[0]))
bb_show_usage();
/* Will complain and die if username not found */
- myname = xstrdup(bb_getpwuid(NULL, -1, myuid));
+ myname = xstrdup(xuid2uname(myuid));
name = argv[0] ? argv[0] : myname;
- pw = getpwnam(name);
- if (!pw) bb_error_msg_and_die("unknown user %s", name);
- if (myuid && pw->pw_uid != myuid) {
+ pw = xgetpwnam(name);
+ if (myuid != 0 && pw->pw_uid != myuid) {
/* LOGMODE_BOTH */
bb_error_msg_and_die("%s can't change password for %s", myname, name);
}
#if ENABLE_FEATURE_SHADOWPASSWDS
- /* getspnam_r() can lie! Even if user isn't in shadow, it can
- * return success (pwd field was seen set to "!" in this case) */
- if (getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result)
- || LONE_CHAR(spw.sp_pwdp, '!')) {
- /* 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 = spw.sp_pwdp;
+ {
+ /* 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;
+ errno = 0;
+ if (getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result) != 0
+ || !result /* no error, but no record found either */
+ || strcmp(result->sp_namp, pw->pw_name) != 0 /* paranoia */
+ ) {
+ if (errno != ENOENT) {
+ /* LOGMODE_BOTH */
+ bb_perror_msg("no record of %s in %s, using %s",
+ name, bb_path_shadow_file,
+ bb_path_passwd_file);
+ }
+ /* else: /etc/shadow does not exist,
+ * apparently we are on a shadow-less system,
+ * no surprise there */
+ } else {
+ pw->pw_passwd = result->sp_pwdp;
+ }
}
#endif
newp = NULL;
c = pw->pw_passwd[0] - '!';
if (!(opt & OPT_lud)) {
- if (myuid && !c) { /* passwd starts with '!' */
+ if (myuid != 0 && !c) { /* passwd starts with '!' */
/* LOGMODE_BOTH */
- bb_error_msg_and_die("cannot change "
+ bb_error_msg_and_die("can't change "
"locked password for %s", name);
}
printf("Changing password for %s\n", name);
- newp = new_password(pw, myuid, opt & STATE_ALGO_md5);
+ newp = new_password(pw, myuid, opt_a);
if (!newp) {
logmode = LOGMODE_STDIO;
bb_error_msg_and_die("password for %s is unchanged", name);
}
} else if (opt & OPT_lock) {
- if (!c) goto skip; /* passwd starts with '!' */
+ if (!c)
+ goto skip; /* passwd starts with '!' */
newp = xasprintf("!%s", pw->pw_passwd);
} else if (opt & OPT_unlock) {
- if (c) goto skip; /* not '!' */
- /* pw->pw_passwd pints to static storage,
+ if (c)
+ goto skip; /* not '!' */
+ /* pw->pw_passwd points to static storage,
* strdup'ing to avoid nasty surprizes */
newp = xstrdup(&pw->pw_passwd[1]);
} else if (opt & OPT_delete) {
- //newp = xstrdup("");
newp = (char*)"";
}
rlimit_fsize.rlim_cur = rlimit_fsize.rlim_max = 512L * 30000;
setrlimit(RLIMIT_FSIZE, &rlimit_fsize);
- signal(SIGHUP, SIG_IGN);
- signal(SIGINT, SIG_IGN);
- signal(SIGQUIT, SIG_IGN);
+ 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 */
+ rc = update_passwd(bb_path_shadow_file, name, newp, NULL);
+ if (rc > 0)
+ /* password in /etc/shadow was updated */
+ newp = (char*) "x";
+ if (rc >= 0)
+ /* 0 = /etc/shadow missing (not an error), >0 = passwd changed in /etc/shadow */
#endif
{
filename = bb_path_passwd_file;
- rc = update_passwd(bb_path_passwd_file, name, newp);
+ rc = update_passwd(bb_path_passwd_file, name, newp, NULL);
}
/* LOGMODE_BOTH */
if (rc < 0)
- bb_error_msg_and_die("cannot update password file %s",
- filename);
+ bb_error_msg_and_die("can't update password file %s", filename);
bb_info_msg("Password for %s changed by %s", name, myname);
- //if (ENABLE_FEATURE_CLEAN_UP) free(newp);
+ /*if (ENABLE_FEATURE_CLEAN_UP) free(newp); - can't, it may be non-malloced */
skip:
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);
+
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(myname);
return 0;
}