Imported Upstream version 4.1.5upstream/4.1.5

1 files changed, 580 insertions, 0 deletions

diff --git a/src/chgpasswd.c b/src/chgpasswd.c
new file mode 100644
index 0000000..bce7a18
--- /dev/null
+++ b/src/chgpasswd.c
@@ -0,0 +1,580 @@
+/*
+ * Copyright (c) 1990 - 1994, Julianne Frances Haugh
+ * Copyright (c) 2006       , Tomasz Kłoczko
+ * Copyright (c) 2006       , Jonas Meurer
+ * Copyright (c) 2007 - 2011, 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.
+ */
+
+#include <config.h>
+
+#ident "$Id: chgpasswd.c 3652 2011-12-09 21:31:39Z nekral-guest $"
+
+#include <fcntl.h>
+#include <getopt.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef ACCT_TOOLS_SETUID
+#ifdef USE_PAM
+#include "pam_defs.h"
+#endif				/* USE_PAM */
+#endif				/* ACCT_TOOLS_SETUID */
+#include "defines.h"
+#include "nscd.h"
+#include "prototypes.h"
+#include "groupio.h"
+#ifdef	SHADOWGRP
+#include "sgroupio.h"
+#endif
+/*@-exitarg@*/
+#include "exitcodes.h"
+
+/*
+ * Global variables
+ */
+const char *Prog;
+static bool eflg   = false;
+static bool md5flg = false;
+#ifdef USE_SHA_CRYPT
+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 SHADOWGRP
+static bool is_shadow_grp;
+static bool sgr_locked = false;
+#endif
+static bool gr_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 (gr_locked) {
+		if (gr_unlock () == 0) {
+			fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ());
+			SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ()));
+			/* continue */
+		}
+	}
+
+#ifdef	SHADOWGRP
+	if (sgr_locked) {
+		if (sgr_unlock () == 0) {
+			fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ());
+			SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ()));
+			/* continue */
+		}
+	}
+#endif
+
+	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"),
+#ifndef USE_SHA_CRYPT
+	                "NONE DES MD5"
+#else				/* USE_SHA_CRYPT */
+	                "NONE DES MD5 SHA256 SHA512"
+#endif				/* USE_SHA_CRYPT */
+	               );
+	(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);
+#ifdef USE_SHA_CRYPT
+	(void) fputs (_("  -s, --sha-rounds              number of SHA rounds for the SHA*\n"
+	                "                                crypt algorithms\n"),
+	              usageout);
+#endif				/* USE_SHA_CRYPT */
+	(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;
+	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'},
+#ifdef USE_SHA_CRYPT
+		{"sha-rounds",   required_argument, NULL, 's'},
+#endif
+		{NULL, 0, NULL, '\0'}
+	};
+
+	while ((c = getopt_long (argc, argv,
+#ifdef USE_SHA_CRYPT
+	                         "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;
+#ifdef USE_SHA_CRYPT
+		case 's':
+			sflg = true;
+			if (getlong(optarg, &sha_rounds) == 0) {
+				fprintf (stderr,
+				         _("%s: invalid numeric argument '%s'\n"),
+				         Prog, optarg);
+				usage (E_USAGE);
+			}
+			break;
+#endif
+		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)
+{
+#ifdef USE_SHA_CRYPT
+	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 (   (0 != strcmp (crypt_method, "DES"))
+		    && (0 != strcmp (crypt_method, "MD5"))
+		    && (0 != strcmp (crypt_method, "NONE"))
+#ifdef USE_SHA_CRYPT
+		    && (0 != strcmp (crypt_method, "SHA256"))
+		    && (0 != strcmp (crypt_method, "SHA512"))
+#endif
+		    ) {
+			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 chgpasswd 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 ACCT_TOOLS_SETUID
+#ifdef USE_PAM
+	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 ("chgpasswd", 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				/* USE_PAM */
+#endif				/* ACCT_TOOLS_SETUID */
+}
+
+/*
+ * open_files - lock and open the group databases
+ */
+static void open_files (void)
+{
+	/*
+	 * Lock the group file and open it for reading and writing. This will
+	 * bring all of the entries into memory where they may be updated.
+	 */
+	if (gr_lock () == 0) {
+		fprintf (stderr,
+		         _("%s: cannot lock %s; try again later.\n"),
+		         Prog, gr_dbname ());
+		fail_exit (1);
+	}
+	gr_locked = true;
+	if (gr_open (O_RDWR) == 0) {
+		fprintf (stderr,
+		         _("%s: cannot open %s\n"), Prog, gr_dbname ());
+		fail_exit (1);
+	}
+
+#ifdef SHADOWGRP
+	/* Do the same for the shadowed database, if it exist */
+	if (is_shadow_grp) {
+		if (sgr_lock () == 0) {
+			fprintf (stderr,
+			         _("%s: cannot lock %s; try again later.\n"),
+			         Prog, sgr_dbname ());
+			fail_exit (1);
+		}
+		sgr_locked = true;
+		if (sgr_open (O_RDWR) == 0) {
+			fprintf (stderr, _("%s: cannot open %s\n"),
+			         Prog, sgr_dbname ());
+			fail_exit (1);
+		}
+	}
+#endif
+}
+
+/*
+ * close_files - close and unlock the group databases
+ */
+static void close_files (void)
+{
+#ifdef SHADOWGRP
+	if (is_shadow_grp) {
+		if (sgr_close () == 0) {
+			fprintf (stderr,
+			         _("%s: failure while writing changes to %s\n"),
+			         Prog, sgr_dbname ());
+			SYSLOG ((LOG_ERR, "failure while writing changes to %s", sgr_dbname ()));
+			fail_exit (1);
+		}
+		if (sgr_unlock () == 0) {
+			fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ());
+			SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ()));
+			/* continue */
+		}
+		sgr_locked = false;
+	}
+#endif
+
+	if (gr_close () == 0) {
+		fprintf (stderr,
+		         _("%s: failure while writing changes to %s\n"),
+		         Prog, gr_dbname ());
+		SYSLOG ((LOG_ERR, "failure while writing changes to %s", gr_dbname ()));
+		fail_exit (1);
+	}
+	if (gr_unlock () == 0) {
+		fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ());
+		SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ()));
+		/* continue */
+	}
+	gr_locked = false;
+}
+
+int main (int argc, char **argv)
+{
+	char buf[BUFSIZ];
+	char *name;
+	char *newpwd;
+	char *cp;
+
+#ifdef	SHADOWGRP
+	const struct sgrp *sg;
+	struct sgrp newsg;
+#endif
+
+	const struct group *gr;
+	struct group newgr;
+	int errors = 0;
+	int line = 0;
+
+	Prog = Basename (argv[0]);
+
+	(void) setlocale (LC_ALL, "");
+	(void) bindtextdomain (PACKAGE, LOCALEDIR);
+	(void) textdomain (PACKAGE);
+
+	process_root_flag ("-R", argc, argv);
+
+	process_flags (argc, argv);
+
+	OPENLOG ("chgpasswd");
+
+	check_perms ();
+
+#ifdef SHADOWGRP
+	is_shadow_grp = sgr_file_present ();
+#endif
+
+	open_files ();
+
+	/*
+	 * Read each line, separating the group name from the password. The
+	 * group entry for each group will be looked up in the appropriate
+	 * file (gshadow or group) and the password changed.
+	 */
+	while (fgets (buf, (int) sizeof buf, stdin) != (char *) 0) {
+		line++;
+		cp = strrchr (buf, '\n');
+		if (NULL != cp) {
+			*cp = '\0';
+		} else {
+			fprintf (stderr, _("%s: line %d: line too long\n"),
+			         Prog, line);
+			errors++;
+			continue;
+		}
+
+		/*
+		 * The group's name 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;
+		if (   (!eflg)
+		    && (   (NULL == crypt_method)
+		        || (0 != strcmp (crypt_method, "NONE")))) {
+			void *arg = NULL;
+			if (md5flg) {
+				crypt_method = "MD5";
+			}
+#ifdef USE_SHA_CRYPT
+			if (sflg) {
+				arg = &sha_rounds;
+			}
+#endif
+			cp = pw_encrypt (newpwd,
+			                 crypt_make_salt (crypt_method, arg));
+		}
+
+		/*
+		 * Get the group file entry for this group. The group must
+		 * already exist.
+		 */
+		gr = gr_locate (name);
+		if (NULL == gr) {
+			fprintf (stderr,
+			         _("%s: line %d: group '%s' does not exist\n"), Prog,
+			         line, name);
+			errors++;
+			continue;
+		}
+#ifdef SHADOWGRP
+		if (is_shadow_grp) {
+			/* The gshadow entry should be updated if the
+			 * group entry has a password set to 'x'.
+			 * But on the other hand, if there is already both
+			 * a group and a gshadow password, it's preferable
+			 * to update both.
+			 */
+			sg = sgr_locate (name);
+
+			if (   (NULL == sg)
+			    && (strcmp (gr->gr_passwd,
+			                SHADOW_PASSWD_STRING) == 0)) {
+				static char *empty = NULL;
+				/* If the password is set to 'x' in
+				 * group, but there are no entries in
+				 * gshadow, create one.
+				 */
+				newsg.sg_name   = name;
+				/* newsg.sg_passwd = NULL; will be set later */
+				newsg.sg_adm    = &empty;
+				newsg.sg_mem    = dup_list (gr->gr_mem);
+				sg = &newsg;
+			}
+		} else {
+			sg = NULL;
+		}
+#endif
+
+		/*
+		 * The freshly encrypted new password is merged into the
+		 * group's entry.
+		 */
+#ifdef SHADOWGRP
+		if (NULL != sg) {
+			newsg = *sg;
+			newsg.sg_passwd = cp;
+		}
+		if (   (NULL == sg)
+		    || (strcmp (gr->gr_passwd, SHADOW_PASSWD_STRING) != 0))
+#endif
+		{
+			newgr = *gr;
+			newgr.gr_passwd = cp;
+		}
+
+		/* 
+		 * The updated group file entry is then put back and will
+		 * be written to the group file later, after all the
+		 * other entries have been updated as well.
+		 */
+#ifdef SHADOWGRP
+		if (NULL != sg) {
+			if (sgr_update (&newsg) == 0) {
+				fprintf (stderr,
+				         _("%s: line %d: failed to prepare the new %s entry '%s'\n"),
+				         Prog, line, sgr_dbname (), newsg.sg_name);
+				errors++;
+				continue;
+			}
+		}
+		if (   (NULL == sg)
+		    || (strcmp (gr->gr_passwd, SHADOW_PASSWD_STRING) != 0))
+#endif
+		{
+			if (gr_update (&newgr) == 0) {
+				fprintf (stderr,
+				         _("%s: line %d: failed to prepare the new %s entry '%s'\n"),
+				         Prog, line, gr_dbname (), newgr.gr_name);
+				errors++;
+				continue;
+			}
+		}
+	}
+
+	/*
+	 * Any detected errors will cause the entire set of changes to be
+	 * aborted. Unlocking the group 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.
+	 */
+	if (0 != errors) {
+		fprintf (stderr,
+		         _("%s: error detected, changes ignored\n"), Prog);
+		fail_exit (1);
+	}
+
+	close_files ();
+
+	nscd_flush_cache ("group");
+
+	return (0);
+}
+