Adding upstream version 1:4.13+dfsg1.upstream/1%4.13+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 685 insertions, 0 deletions

diff --git a/src/chpasswd.c b/src/chpasswd.c
new file mode 100644
index 0000000..48d5178
--- /dev/null
+++ b/src/chpasswd.c
@@ -0,0 +1,685 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2000 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2011, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <fcntl.h>
+#include <getopt.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef USE_PAM
+#include "pam_defs.h"
+#endif				/* USE_PAM */
+#include "defines.h"
+#include "nscd.h"
+#include "sssd.h"
+#include "getdef.h"
+#include "prototypes.h"
+#include "pwio.h"
+#include "shadowio.h"
+/*@-exitarg@*/
+#include "exitcodes.h"
+#include "shadowlog.h"
+
+#define IS_CRYPT_METHOD(str) ((crypt_method != NULL && strcmp(crypt_method, str) == 0) ? true : false)
+
+/*
+ * Global variables
+ */
+const char *Prog;
+static bool eflg   = false;
+static bool md5flg = false;
+#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) || defined(USE_YESCRYPT)
+static bool sflg   = false;
+#endif
+
+static /*@null@*//*@observer@*/const char *crypt_method = NULL;
+#define cflg (NULL != crypt_method)
+#ifdef USE_SHA_CRYPT
+static long sha_rounds = 5000;
+#endif
+#ifdef USE_BCRYPT
+static long bcrypt_rounds = 13;
+#endif
+#ifdef USE_YESCRYPT
+static long yescrypt_cost = 5;
+#endif
+
+static bool is_shadow_pwd;
+static bool pw_locked = false;
+static bool spw_locked = false;
+
+/* local function prototypes */
+static void fail_exit (int code);
+static /*@noreturn@*/void usage (int status);
+static void process_flags (int argc, char **argv);
+static void check_flags (void);
+static void check_perms (void);
+static void open_files (void);
+static void close_files (void);
+
+/*
+ * fail_exit - exit with a failure code after unlocking the files
+ */
+static void fail_exit (int code)
+{
+	if (pw_locked) {
+		if (pw_unlock () == 0) {
+			fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, pw_dbname ());
+			SYSLOG ((LOG_ERR, "failed to unlock %s", pw_dbname ()));
+			/* continue */
+		}
+	}
+
+	if (spw_locked) {
+		if (spw_unlock () == 0) {
+			fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ());
+			SYSLOG ((LOG_ERR, "failed to unlock %s", spw_dbname ()));
+			/* continue */
+		}
+	}
+
+	exit (code);
+}
+
+/*
+ * usage - display usage message and exit
+ */
+static /*@noreturn@*/void usage (int status)
+{
+	FILE *usageout = (E_SUCCESS != status) ? stderr : stdout;
+	(void) fprintf (usageout,
+	                _("Usage: %s [options]\n"
+	                  "\n"
+	                  "Options:\n"),
+	                Prog);
+	(void) fprintf (usageout,
+	                _("  -c, --crypt-method METHOD     the crypt method (one of %s)\n"),
+	                "NONE DES MD5"
+#if defined(USE_SHA_CRYPT)
+	                " SHA256 SHA512"
+#endif
+#if defined(USE_BCRYPT)
+	                " BCRYPT"
+#endif
+#if defined(USE_YESCRYPT)
+	                " YESCRYPT"
+#endif
+	               );
+	(void) fputs (_("  -e, --encrypted               supplied passwords are encrypted\n"), usageout);
+	(void) fputs (_("  -h, --help                    display this help message and exit\n"), usageout);
+	(void) fputs (_("  -m, --md5                     encrypt the clear text password using\n"
+	                "                                the MD5 algorithm\n"),
+	              usageout);
+	(void) fputs (_("  -R, --root CHROOT_DIR         directory to chroot into\n"), usageout);
+#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) || defined(USE_YESCRYPT)
+	(void) fputs (_("  -s, --sha-rounds              number of rounds for the SHA, BCRYPT\n"
+	                "                                or YESCRYPT crypt algorithms\n"),
+	              usageout);
+#endif				/* USE_SHA_CRYPT || USE_BCRYPT || USE_YESCRYPT */
+	(void) fputs ("\n", usageout);
+
+	exit (status);
+}
+
+/*
+ * process_flags - parse the command line options
+ *
+ *	It will not return if an error is encountered.
+ */
+static void process_flags (int argc, char **argv)
+{
+	int c;
+#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) || defined(USE_YESCRYPT)
+        int bad_s;
+#endif				/* USE_SHA_CRYPT || USE_BCRYPT || USE_YESCRYPT */
+	static struct option long_options[] = {
+		{"crypt-method", required_argument, NULL, 'c'},
+		{"encrypted",    no_argument,       NULL, 'e'},
+		{"help",         no_argument,       NULL, 'h'},
+		{"md5",          no_argument,       NULL, 'm'},
+		{"root",         required_argument, NULL, 'R'},
+#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) || defined(USE_YESCRYPT)
+		{"sha-rounds",   required_argument, NULL, 's'},
+#endif				/* USE_SHA_CRYPT || USE_BCRYPT || USE_YESCRYPT */
+		{NULL, 0, NULL, '\0'}
+	};
+
+	while ((c = getopt_long (argc, argv,
+#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) || defined(USE_YESCRYPT)
+	                         "c:ehmR:s:",
+#else
+	                         "c:ehmR:",
+#endif
+	                         long_options, NULL)) != -1) {
+		switch (c) {
+		case 'c':
+			crypt_method = optarg;
+			break;
+		case 'e':
+			eflg = true;
+			break;
+		case 'h':
+			usage (E_SUCCESS);
+			/*@notreached@*/break;
+		case 'm':
+			md5flg = true;
+			break;
+		case 'R': /* no-op, handled in process_root_flag () */
+			break;
+#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) || defined(USE_YESCRYPT)
+		case 's':
+			sflg = true;
+                        bad_s = 0;
+#if defined(USE_SHA_CRYPT)
+			if ((IS_CRYPT_METHOD("SHA256") || IS_CRYPT_METHOD("SHA512"))
+			    && (0 == getlong(optarg, &sha_rounds))) {
+                            bad_s = 1;
+                        }
+#endif				/* USE_SHA_CRYPT */
+#if defined(USE_BCRYPT)
+                        if (IS_CRYPT_METHOD("BCRYPT")
+			    && (0 == getlong(optarg, &bcrypt_rounds))) {
+                            bad_s = 1;
+                        }
+#endif				/* USE_BCRYPT */
+#if defined(USE_YESCRYPT)
+                        if (IS_CRYPT_METHOD("YESCRYPT")
+			    && (0 == getlong(optarg, &yescrypt_cost))) {
+                            bad_s = 1;
+                        }
+#endif				/* USE_YESCRYPT */
+                        if (bad_s != 0) {
+				fprintf (stderr,
+				         _("%s: invalid numeric argument '%s'\n"),
+				         Prog, optarg);
+				usage (E_USAGE);
+			}
+			break;
+#endif				/* USE_SHA_CRYPT || USE_BCRYPT || USE_YESCRYPT */
+
+		default:
+			usage (E_USAGE);
+			/*@notreached@*/break;
+		}
+	}
+
+	/* validate options */
+	check_flags ();
+}
+
+/*
+ * check_flags - check flags and parameters consistency
+ *
+ *	It will not return if an error is encountered.
+ */
+static void check_flags (void)
+{
+#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) || defined(USE_YESCRYPT)
+	if (sflg && !cflg) {
+		fprintf (stderr,
+		         _("%s: %s flag is only allowed with the %s flag\n"),
+		         Prog, "-s", "-c");
+		usage (E_USAGE);
+	}
+#endif
+
+	if ((eflg && (md5flg || cflg)) ||
+	    (md5flg && cflg)) {
+		fprintf (stderr,
+		         _("%s: the -c, -e, and -m flags are exclusive\n"),
+		         Prog);
+		usage (E_USAGE);
+	}
+
+	if (cflg) {
+		if ((!IS_CRYPT_METHOD("DES"))
+		    &&(!IS_CRYPT_METHOD("MD5"))
+		    &&(!IS_CRYPT_METHOD("NONE"))
+#ifdef USE_SHA_CRYPT
+		    &&(!IS_CRYPT_METHOD("SHA256"))
+		    &&(!IS_CRYPT_METHOD("SHA512"))
+#endif				/* USE_SHA_CRYPT */
+#ifdef USE_BCRYPT
+		    &&(!IS_CRYPT_METHOD("BCRYPT"))
+#endif				/* USE_BCRYPT */
+#ifdef USE_YESCRYPT
+		    &&(!IS_CRYPT_METHOD("YESCRYPT"))
+#endif				/* USE_YESCRYPT */
+		    ) {
+			fprintf (stderr,
+			         _("%s: unsupported crypt method: %s\n"),
+			         Prog, crypt_method);
+			usage (E_USAGE);
+		}
+	}
+}
+
+/*
+ * check_perms - check if the caller is allowed to add a group
+ *
+ *	With PAM support, the setuid bit can be set on chpasswd to allow
+ *	non-root users to groups.
+ *	Without PAM support, only users who can write in the group databases
+ *	can add groups.
+ *
+ *	It will not return if the user is not allowed.
+ */
+static void check_perms (void)
+{
+#ifdef USE_PAM
+#ifdef ACCT_TOOLS_SETUID
+	/* If chpasswd uses PAM and is SUID, check the permissions,
+	 * otherwise, the permissions are enforced by the access to the
+	 * passwd and shadow files.
+	 */
+	pam_handle_t *pamh = NULL;
+	int retval;
+	struct passwd *pampw;
+
+	pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
+	if (NULL == pampw) {
+		fprintf (stderr,
+		         _("%s: Cannot determine your user name.\n"),
+		         Prog);
+		exit (1);
+	}
+
+	retval = pam_start ("chpasswd", pampw->pw_name, &conv, &pamh);
+
+	if (PAM_SUCCESS == retval) {
+		retval = pam_authenticate (pamh, 0);
+	}
+
+	if (PAM_SUCCESS == retval) {
+		retval = pam_acct_mgmt (pamh, 0);
+	}
+
+	if (PAM_SUCCESS != retval) {
+		fprintf (stderr, _("%s: PAM: %s\n"),
+		         Prog, pam_strerror (pamh, retval));
+		SYSLOG((LOG_ERR, "%s", pam_strerror (pamh, retval)));
+		if (NULL != pamh) {
+			(void) pam_end (pamh, retval);
+		}
+		exit (1);
+	}
+	(void) pam_end (pamh, retval);
+#endif				/* ACCT_TOOLS_SETUID */
+#endif				/* USE_PAM */
+}
+
+/*
+ * open_files - lock and open the password databases
+ */
+static void open_files (void)
+{
+	/*
+	 * Lock the password file and open it for reading and writing. This
+	 * will bring all of the entries into memory where they may be updated.
+	 */
+	if (pw_lock () == 0) {
+		fprintf (stderr,
+		         _("%s: cannot lock %s; try again later.\n"),
+		         Prog, pw_dbname ());
+		fail_exit (1);
+	}
+	pw_locked = true;
+	if (pw_open (O_CREAT | O_RDWR) == 0) {
+		fprintf (stderr,
+		         _("%s: cannot open %s\n"), Prog, pw_dbname ());
+		fail_exit (1);
+	}
+
+	/* Do the same for the shadowed database, if it exist */
+	if (is_shadow_pwd) {
+		if (spw_lock () == 0) {
+			fprintf (stderr,
+			         _("%s: cannot lock %s; try again later.\n"),
+			         Prog, spw_dbname ());
+			fail_exit (1);
+		}
+		spw_locked = true;
+		if (spw_open (O_CREAT | O_RDWR) == 0) {
+			fprintf (stderr,
+			         _("%s: cannot open %s\n"),
+			         Prog, spw_dbname ());
+			fail_exit (1);
+		}
+	}
+}
+
+/*
+ * close_files - close and unlock the password databases
+ */
+static void close_files (void)
+{
+	if (is_shadow_pwd) {
+		if (spw_close () == 0) {
+			fprintf (stderr,
+			         _("%s: failure while writing changes to %s\n"),
+			         Prog, spw_dbname ());
+			SYSLOG ((LOG_ERR, "failure while writing changes to %s", spw_dbname ()));
+			fail_exit (1);
+		}
+		if (spw_unlock () == 0) {
+			fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ());
+			SYSLOG ((LOG_ERR, "failed to unlock %s", spw_dbname ()));
+			/* continue */
+		}
+		spw_locked = false;
+	}
+
+	if (pw_close () == 0) {
+		fprintf (stderr,
+		         _("%s: failure while writing changes to %s\n"),
+		         Prog, pw_dbname ());
+		SYSLOG ((LOG_ERR, "failure while writing changes to %s", pw_dbname ()));
+		fail_exit (1);
+	}
+	if (pw_unlock () == 0) {
+		fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, pw_dbname ());
+		SYSLOG ((LOG_ERR, "failed to unlock %s", pw_dbname ()));
+		/* continue */
+	}
+	pw_locked = false;
+}
+
+static const char *get_salt(void)
+{
+	void *arg = NULL;
+
+	if (eflg || IS_CRYPT_METHOD("NONE")) {
+		return NULL;
+	}
+
+	if (md5flg) {
+		crypt_method = "MD5";
+	}
+#if defined(USE_SHA_CRYPT) || defined(USE_BCRYPT) || defined(USE_YESCRYPT)
+	if (sflg) {
+#if defined(USE_SHA_CRYPT)
+		if (IS_CRYPT_METHOD("SHA256") || IS_CRYPT_METHOD("SHA512")) {
+			arg = &sha_rounds;
+		}
+#endif				/* USE_SHA_CRYPT */
+#if defined(USE_BCRYPT)
+		if (IS_CRYPT_METHOD("BCRYPT")) {
+			arg = &bcrypt_rounds;
+		}
+#endif				/* USE_BCRYPT */
+#if defined(USE_YESCRYPT)
+		if (IS_CRYPT_METHOD("YESCRYPT")) {
+			arg = &yescrypt_cost;
+		}
+#endif				/* USE_YESCRYPT */
+	}
+#endif
+	return crypt_make_salt (crypt_method, arg);
+}
+
+int main (int argc, char **argv)
+{
+	char buf[BUFSIZ];
+	char *name;
+	char *newpwd;
+	char *cp;
+	const char *salt;
+
+#ifdef USE_PAM
+	bool use_pam = true;
+#endif				/* USE_PAM */
+
+	int errors = 0;
+	int line = 0;
+
+	Prog = Basename (argv[0]);
+	log_set_progname(Prog);
+	log_set_logfd(stderr);
+
+	(void) setlocale (LC_ALL, "");
+	(void) bindtextdomain (PACKAGE, LOCALEDIR);
+	(void) textdomain (PACKAGE);
+
+	process_flags (argc, argv);
+
+	salt = get_salt();
+	process_root_flag ("-R", argc, argv);
+
+#ifdef USE_PAM
+	if (md5flg || eflg || cflg) {
+		use_pam = false;
+	}
+#endif				/* USE_PAM */
+
+	OPENLOG ("chpasswd");
+
+	check_perms ();
+
+#ifdef USE_PAM
+	if (!use_pam)
+#endif				/* USE_PAM */
+	{
+		is_shadow_pwd = spw_file_present ();
+
+		open_files ();
+	}
+
+	/*
+	 * Read each line, separating the user name from the password. The
+	 * password entry for each user will be looked up in the appropriate
+	 * file (shadow or passwd) and the password changed. For shadow
+	 * files the last change date is set directly, for passwd files the
+	 * last change date is set in the age only if aging information is
+	 * present.
+	 */
+	while (fgets (buf, (int) sizeof buf, stdin) != (char *) 0) {
+		line++;
+		cp = strrchr (buf, '\n');
+		if (NULL != cp) {
+			*cp = '\0';
+		} else {
+			if (feof (stdin) == 0) {
+
+				// Drop all remaining characters on this line.
+				while (fgets (buf, (int) sizeof buf, stdin) != (char *) 0) {
+					cp = strchr (buf, '\n');
+					if (cp != NULL) {
+						break;
+					}
+				}
+
+				fprintf (stderr,
+				         _("%s: line %d: line too long\n"),
+				         Prog, line);
+				errors++;
+				continue;
+			}
+		}
+
+		/*
+		 * The username is the first field. It is separated from the
+		 * password with a ":" character which is replaced with a
+		 * NUL to give the new password. The new password will then
+		 * be encrypted in the normal fashion with a new salt
+		 * generated, unless the '-e' is given, in which case it is
+		 * assumed to already be encrypted.
+		 */
+
+		name = buf;
+		cp = strchr (name, ':');
+		if (NULL != cp) {
+			*cp = '\0';
+			cp++;
+		} else {
+			fprintf (stderr,
+			         _("%s: line %d: missing new password\n"),
+			         Prog, line);
+			errors++;
+			continue;
+		}
+		newpwd = cp;
+
+#ifdef USE_PAM
+		if (use_pam) {
+			if (do_pam_passwd_non_interactive ("chpasswd", name, newpwd) != 0) {
+				fprintf (stderr,
+				         _("%s: (line %d, user %s) password not changed\n"),
+				         Prog, line, name);
+				errors++;
+			}
+		} else
+#endif				/* USE_PAM */
+		{
+		const struct spwd *sp;
+		struct spwd newsp;
+		const struct passwd *pw;
+		struct passwd newpw;
+
+		if (salt) {
+			cp = pw_encrypt (newpwd, salt);
+			if (NULL == cp) {
+				fprintf (stderr,
+				         _("%s: failed to crypt password with salt '%s': %s\n"),
+				         Prog, salt, strerror (errno));
+				fail_exit (1);
+			}
+		}
+
+		/*
+		 * Get the password file entry for this user. The user must
+		 * already exist.
+		 */
+		pw = pw_locate (name);
+		if (NULL == pw) {
+			fprintf (stderr,
+			         _("%s: line %d: user '%s' does not exist\n"), Prog,
+			         line, name);
+			errors++;
+			continue;
+		}
+		if (is_shadow_pwd) {
+			/* The shadow entry should be updated if the
+			 * passwd entry has a password set to 'x'.
+			 * But on the other hand, if there is already both
+			 * a passwd and a shadow password, it's preferable
+			 * to update both.
+			 */
+			sp = spw_locate (name);
+
+			if (   (NULL == sp)
+			    && (strcmp (pw->pw_passwd,
+			                SHADOW_PASSWD_STRING) == 0)) {
+				/* If the password is set to 'x' in
+				 * passwd, but there are no entries in
+				 * shadow, create one.
+				 */
+				newsp.sp_namp  = name;
+				/* newsp.sp_pwdp  = NULL; will be set later */
+				/* newsp.sp_lstchg= 0;    will be set later */
+				newsp.sp_min   = getdef_num ("PASS_MIN_DAYS", -1);
+				newsp.sp_max   = getdef_num ("PASS_MAX_DAYS", -1);
+				newsp.sp_warn  = getdef_num ("PASS_WARN_AGE", -1);
+				newsp.sp_inact = -1;
+				newsp.sp_expire= -1;
+				newsp.sp_flag  = SHADOW_SP_FLAG_UNSET;
+				sp = &newsp;
+			}
+		} else {
+			sp = NULL;
+		}
+
+		/*
+		 * The freshly encrypted new password is merged into the
+		 * user's password file entry and the last password change
+		 * date is set to the current date.
+		 */
+		if (NULL != sp) {
+			newsp = *sp;
+			newsp.sp_pwdp = cp;
+			newsp.sp_lstchg = (long) gettime () / SCALE;
+			if (0 == newsp.sp_lstchg) {
+				/* Better disable aging than requiring a
+				 * password change */
+				newsp.sp_lstchg = -1;
+			}
+		}
+
+		if (   (NULL == sp)
+		    || (strcmp (pw->pw_passwd, SHADOW_PASSWD_STRING) != 0)) {
+			newpw = *pw;
+			newpw.pw_passwd = cp;
+		}
+
+		/*
+		 * The updated password file entry is then put back and will
+		 * be written to the password file later, after all the
+		 * other entries have been updated as well.
+		 */
+		if (NULL != sp) {
+			if (spw_update (&newsp) == 0) {
+				fprintf (stderr,
+				         _("%s: line %d: failed to prepare the new %s entry '%s'\n"),
+				         Prog, line, spw_dbname (), newsp.sp_namp);
+				errors++;
+				continue;
+			}
+		}
+		if (   (NULL == sp)
+		    || (strcmp (pw->pw_passwd, SHADOW_PASSWD_STRING) != 0)) {
+			if (pw_update (&newpw) == 0) {
+				fprintf (stderr,
+				         _("%s: line %d: failed to prepare the new %s entry '%s'\n"),
+				         Prog, line, pw_dbname (), newpw.pw_name);
+				errors++;
+				continue;
+			}
+		}
+		}
+	}
+
+	/*
+	 * Any detected errors will cause the entire set of changes to be
+	 * aborted. Unlocking the password file will cause all of the
+	 * changes to be ignored. Otherwise the file is closed, causing the
+	 * changes to be written out all at once, and then unlocked
+	 * afterwards.
+	 *
+	 * With PAM, it is not possible to delay the update of the
+	 * password database.
+	 */
+	if (0 != errors) {
+#ifdef USE_PAM
+		if (!use_pam)
+#endif				/* USE_PAM */
+		{
+			fprintf (stderr,
+			         _("%s: error detected, changes ignored\n"),
+			         Prog);
+		}
+		fail_exit (1);
+	}
+
+#ifdef USE_PAM
+	if (!use_pam)
+#endif				/* USE_PAM */
+	{
+	/* Save the changes */
+		close_files ();
+	}
+
+	nscd_flush_cache ("passwd");
+	sssd_flush_cache (SSSD_DB_PASSWD);
+
+	return (0);
+}
+