Imported Upstream version 4.1.5.1upstream/4.1.5.1

1 files changed, 510 insertions, 0 deletions

diff --git a/lib/getdef.c b/lib/getdef.c
new file mode 100644
index 00000000..ac08163c
--- /dev/null
+++ b/lib/getdef.c
@@ -0,0 +1,510 @@
+/*
+ * Copyright (c) 1991 - 1994, Julianne Frances Haugh
+ * Copyright (c) 1996 - 2000, Marek Michałkiewicz
+ * Copyright (c) 2002 - 2006, Tomasz Kłoczko
+ * Copyright (c) 2007 - 2008, 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: getdef.c 3095 2010-03-04 18:11:13Z nekral-guest $"
+
+#include "prototypes.h"
+#include "defines.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <errno.h>
+#include "getdef.h"
+/*
+ * A configuration item definition.
+ */
+struct itemdef {
+	/*@null@*/const char *name;	/* name of the item                     */
+	/*@null@*/char *value;		/* value given, or NULL if no value     */
+};
+
+#define NUMDEFS	(sizeof(def_table)/sizeof(def_table[0]))
+static struct itemdef def_table[] = {
+	{"CHFN_RESTRICT", NULL},
+	{"CONSOLE_GROUPS", NULL},
+	{"CONSOLE", NULL},
+	{"CREATE_HOME", NULL},
+	{"DEFAULT_HOME", NULL},
+	{"ENCRYPT_METHOD", NULL},
+	{"ENV_PATH", NULL},
+	{"ENV_SUPATH", NULL},
+	{"ERASECHAR", NULL},
+	{"FAIL_DELAY", NULL},
+	{"FAKE_SHELL", NULL},
+	{"GID_MAX", NULL},
+	{"GID_MIN", NULL},
+	{"HUSHLOGIN_FILE", NULL},
+	{"KILLCHAR", NULL},
+	{"LOGIN_RETRIES", NULL},
+	{"LOGIN_TIMEOUT", NULL},
+	{"LOG_OK_LOGINS", NULL},
+	{"LOG_UNKFAIL_ENAB", NULL},
+	{"MAIL_DIR", NULL},
+	{"MAIL_FILE", NULL},
+	{"MAX_MEMBERS_PER_GROUP", NULL},
+	{"MD5_CRYPT_ENAB", NULL},
+	{"PASS_MAX_DAYS", NULL},
+	{"PASS_MIN_DAYS", NULL},
+	{"PASS_WARN_AGE", NULL},
+#ifdef USE_SHA_CRYPT
+	{"SHA_CRYPT_MAX_ROUNDS", NULL},
+	{"SHA_CRYPT_MIN_ROUNDS", NULL},
+#endif
+	{"SULOG_FILE", NULL},
+	{"SU_NAME", NULL},
+	{"SYS_GID_MAX", NULL},
+	{"SYS_GID_MIN", NULL},
+	{"SYS_UID_MAX", NULL},
+	{"SYS_UID_MIN", NULL},
+	{"TTYGROUP", NULL},
+	{"TTYPERM", NULL},
+	{"TTYTYPE_FILE", NULL},
+	{"UID_MAX", NULL},
+	{"UID_MIN", NULL},
+	{"UMASK", NULL},
+	{"USERDEL_CMD", NULL},
+	{"USERGROUPS_ENAB", NULL},
+#ifndef USE_PAM
+	{"CHFN_AUTH", NULL},
+	{"CHSH_AUTH", NULL},
+	{"CRACKLIB_DICTPATH", NULL},
+	{"ENV_HZ", NULL},
+	{"ENVIRON_FILE", NULL},
+	{"ENV_TZ", NULL},
+	{"FAILLOG_ENAB", NULL},
+	{"FTMP_FILE", NULL},
+	{"ISSUE_FILE", NULL},
+	{"LASTLOG_ENAB", NULL},
+	{"LOGIN_STRING", NULL},
+	{"MAIL_CHECK_ENAB", NULL},
+	{"MOTD_FILE", NULL},
+	{"NOLOGINS_FILE", NULL},
+	{"OBSCURE_CHECKS_ENAB", NULL},
+	{"PASS_ALWAYS_WARN", NULL},
+	{"PASS_CHANGE_TRIES", NULL},
+	{"PASS_MAX_LEN", NULL},
+	{"PASS_MIN_LEN", NULL},
+	{"PORTTIME_CHECKS_ENAB", NULL},
+	{"QUOTAS_ENAB", NULL},
+	{"SU_WHEEL_ONLY", NULL},
+	{"ULIMIT", NULL},
+#endif
+#ifdef USE_SYSLOG
+	{"SYSLOG_SG_ENAB", NULL},
+	{"SYSLOG_SU_ENAB", NULL},
+#endif
+#ifdef WITH_TCB
+	{"TCB_AUTH_GROUP", NULL},
+	{"TCB_SYMLINKS", NULL},
+	{"USE_TCB", NULL},
+#endif
+	{NULL, NULL}
+};
+
+#ifndef LOGINDEFS
+#define LOGINDEFS "/etc/login.defs"
+#endif
+
+static char def_fname[] = LOGINDEFS;	/* login config defs file       */
+static bool def_loaded = false;		/* are defs already loaded?     */
+
+/* local function prototypes */
+static /*@observer@*/ /*@null@*/struct itemdef *def_find (const char *);
+static void def_load (void);
+
+
+/*
+ * getdef_str - get string value from table of definitions.
+ *
+ * Return point to static data for specified item, or NULL if item is not
+ * defined.  First time invoked, will load definitions from the file.
+ */
+
+/*@observer@*/ /*@null@*/const char *getdef_str (const char *item)
+{
+	struct itemdef *d;
+
+	if (!def_loaded) {
+		def_load ();
+	}
+
+	d = def_find (item);
+	return ((NULL == d)? (const char *) NULL : d->value);
+}
+
+
+/*
+ * getdef_bool - get boolean value from table of definitions.
+ *
+ * Return TRUE if specified item is defined as "yes", else FALSE.
+ */
+
+bool getdef_bool (const char *item)
+{
+	struct itemdef *d;
+
+	if (!def_loaded) {
+		def_load ();
+	}
+
+	d = def_find (item);
+	if ((NULL == d) || (NULL == d->value)) {
+		return false;
+	}
+
+	return (strcasecmp (d->value, "yes") == 0);
+}
+
+
+/*
+ * getdef_num - get numerical value from table of definitions
+ *
+ * Returns numeric value of specified item, else the "dflt" value if
+ * the item is not defined.  Octal (leading "0") and hex (leading "0x")
+ * values are handled.
+ */
+
+int getdef_num (const char *item, int dflt)
+{
+	struct itemdef *d;
+	long val;
+
+	if (!def_loaded) {
+		def_load ();
+	}
+
+	d = def_find (item);
+	if ((NULL == d) || (NULL == d->value)) {
+		return dflt;
+	}
+
+	if (   (getlong (d->value, &val) == 0)
+	    || (val > INT_MAX)
+	    || (val < INT_MIN)) {
+		fprintf (stderr,
+		         _("configuration error - cannot parse %s value: '%s'"),
+		         item, d->value);
+		return dflt;
+	}
+
+	return (int) val;
+}
+
+
+/*
+ * getdef_unum - get unsigned numerical value from table of definitions
+ *
+ * Returns numeric value of specified item, else the "dflt" value if
+ * the item is not defined.  Octal (leading "0") and hex (leading "0x")
+ * values are handled.
+ */
+
+unsigned int getdef_unum (const char *item, unsigned int dflt)
+{
+	struct itemdef *d;
+	long val;
+
+	if (!def_loaded) {
+		def_load ();
+	}
+
+	d = def_find (item);
+	if ((NULL == d) || (NULL == d->value)) {
+		return dflt;
+	}
+
+	if (   (getlong (d->value, &val) == 0)
+	    || (val < 0)
+	    || (val > INT_MAX)) {
+		fprintf (stderr,
+		         _("configuration error - cannot parse %s value: '%s'"),
+		         item, d->value);
+		return dflt;
+	}
+
+	return (unsigned int) val;
+}
+
+
+/*
+ * getdef_long - get long integer value from table of definitions
+ *
+ * Returns numeric value of specified item, else the "dflt" value if
+ * the item is not defined.  Octal (leading "0") and hex (leading "0x")
+ * values are handled.
+ */
+
+long getdef_long (const char *item, long dflt)
+{
+	struct itemdef *d;
+	long val;
+
+	if (!def_loaded) {
+		def_load ();
+	}
+
+	d = def_find (item);
+	if ((NULL == d) || (NULL == d->value)) {
+		return dflt;
+	}
+
+	if (getlong (d->value, &val) == 0) {
+		fprintf (stderr,
+		         _("configuration error - cannot parse %s value: '%s'"),
+		         item, d->value);
+		return dflt;
+	}
+
+	return val;
+}
+
+/*
+ * getdef_ulong - get unsigned long numerical value from table of definitions
+ *
+ * Returns numeric value of specified item, else the "dflt" value if
+ * the item is not defined.  Octal (leading "0") and hex (leading "0x")
+ * values are handled.
+ */
+
+unsigned long getdef_ulong (const char *item, unsigned long dflt)
+{
+	struct itemdef *d;
+	unsigned long val;
+
+	if (!def_loaded) {
+		def_load ();
+	}
+
+	d = def_find (item);
+	if ((NULL == d) || (NULL == d->value)) {
+		return dflt;
+	}
+
+	if (getulong (d->value, &val) == 0) {
+		/* FIXME: we should have a getulong */
+		fprintf (stderr,
+		         _("configuration error - cannot parse %s value: '%s'"),
+		         item, d->value);
+		return dflt;
+	}
+
+	return val;
+}
+
+/*
+ * putdef_str - override the value read from /etc/login.defs
+ * (also used when loading the initial defaults)
+ */
+
+int putdef_str (const char *name, const char *value)
+{
+	struct itemdef *d;
+	char *cp;
+
+	if (!def_loaded) {
+		def_load ();
+	}
+
+	/*
+	 * Locate the slot to save the value.  If this parameter
+	 * is unknown then "def_find" will print an err message.
+	 */
+	d = def_find (name);
+	if (NULL == d) {
+		return -1;
+	}
+
+	/*
+	 * Save off the value.
+	 */
+	cp = strdup (value);
+	if (NULL == cp) {
+		(void) fputs (_("Could not allocate space for config info.\n"),
+		              stderr);
+		SYSLOG ((LOG_ERR, "could not allocate space for config info"));
+		return -1;
+	}
+
+	if (NULL != d->value) {
+		free (d->value);
+	}
+
+	d->value = cp;
+	return 0;
+}
+
+
+/*
+ * def_find - locate named item in table
+ *
+ * Search through a table of configurable items to locate the
+ * specified configuration option.
+ */
+
+static /*@observer@*/ /*@null@*/struct itemdef *def_find (const char *name)
+{
+	struct itemdef *ptr;
+
+
+	/*
+	 * Search into the table.
+	 */
+
+	for (ptr = def_table; NULL != ptr->name; ptr++) {
+		if (strcmp (ptr->name, name) == 0) {
+			return ptr;
+		}
+	}
+
+	/*
+	 * Item was never found.
+	 */
+
+	fprintf (stderr,
+	         _("configuration error - unknown item '%s' (notify administrator)\n"),
+	         name);
+	SYSLOG ((LOG_CRIT, "unknown configuration item `%s'", name));
+	return (struct itemdef *) NULL;
+}
+
+/*
+ * def_load - load configuration table
+ *
+ * Loads the user-configured options from the default configuration file
+ */
+
+static void def_load (void)
+{
+	int i;
+	FILE *fp;
+	char buf[1024], *name, *value, *s;
+
+	/*
+	 * Open the configuration definitions file.
+	 */
+	fp = fopen (def_fname, "r");
+	if (NULL == fp) {
+		int err = errno;
+		SYSLOG ((LOG_CRIT, "cannot open login definitions %s [%s]",
+		         def_fname, strerror (err)));
+		exit (EXIT_FAILURE);
+	}
+
+	/*
+	 * Set the initialized flag.
+	 * (do it early to prevent recursion in putdef_str())
+	 */
+	def_loaded = true;
+
+	/*
+	 * Go through all of the lines in the file.
+	 */
+	while (fgets (buf, (int) sizeof (buf), fp) != NULL) {
+
+		/*
+		 * Trim trailing whitespace.
+		 */
+		for (i = (int) strlen (buf) - 1; i >= 0; --i) {
+			if (!isspace (buf[i])) {
+				break;
+			}
+		}
+		i++;
+		buf[i] = '\0';
+
+		/*
+		 * Break the line into two fields.
+		 */
+		name = buf + strspn (buf, " \t");	/* first nonwhite */
+		if (*name == '\0' || *name == '#')
+			continue;	/* comment or empty */
+
+		s = name + strcspn (name, " \t");	/* end of field */
+		if (*s == '\0')
+			continue;	/* only 1 field?? */
+
+		*s++ = '\0';
+		value = s + strspn (s, " \"\t");	/* next nonwhite */
+		*(value + strcspn (value, "\"")) = '\0';
+
+		/*
+		 * Store the value in def_table.
+		 *
+		 * Ignore failures to load the login.defs file.
+		 * The error was already reported to the user and to
+		 * syslog. The tools will just use their default values.
+		 */
+		(void)putdef_str (name, value);
+	}
+
+	if (ferror (fp) != 0) {
+		int err = errno;
+		SYSLOG ((LOG_CRIT, "cannot read login definitions %s [%s]",
+		         def_fname, strerror (err)));
+		exit (EXIT_FAILURE);
+	}
+
+	(void) fclose (fp);
+}
+
+
+#ifdef CKDEFS
+int main (int argc, char **argv)
+{
+	int i;
+	char *cp;
+	struct itemdef *d;
+
+	def_load ();
+
+	for (i = 0; i < NUMDEFS; ++i) {
+		d = def_find (def_table[i].name);
+		if (NULL == d) {
+			printf ("error - lookup '%s' failed\n",
+			        def_table[i].name);
+		} else {
+			printf ("%4d %-24s %s\n", i + 1, d->name, d->value);
+		}
+	}
+	for (i = 1; i < argc; i++) {
+		cp = getdef_str (argv[1]);
+		if (NULL != cp) {
+			printf ("%s `%s'\n", argv[1], cp);
+		} else {
+			printf ("%s not found\n", argv[1]);
+		}
+	}
+	exit (EXIT_SUCCESS);
+}
+#endif