Adding upstream version 1:4.13+dfsg1.upstream/1%4.13+dfsg1upstream

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

1 files changed, 341 insertions, 0 deletions

diff --git a/src/login_nopam.c b/src/login_nopam.c
new file mode 100644
index 0000000..df6ba88
--- /dev/null
+++ b/src/login_nopam.c
@@ -0,0 +1,341 @@
+/* Taken from logdaemon-5.0, only minimal changes.  --marekm */
+/*
+ * SPDX-FileCopyrightText: 1990 - 1995, Wietse Venema.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
+/************************************************************************
+* Copyright 1995 by Wietse Venema.  All rights reserved. Individual files
+* may be covered by other copyrights (as noted in the file itself.)
+*
+* This material was originally written and compiled by Wietse Venema at
+* Eindhoven University of Technology, The Netherlands, in 1990, 1991,
+* 1992, 1993, 1994 and 1995.
+*
+* Redistribution and use in source and binary forms are permitted
+* provided that this entire copyright notice is duplicated in all such
+* copies.
+*
+* This software is provided "as is" and without any expressed or implied
+* warranties, including, without limitation, the implied warranties of
+* merchantibility and fitness for any particular purpose.
+************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifndef USE_PAM
+#ident "$Id$"
+
+#include "prototypes.h"
+    /*
+     * This module implements a simple but effective form of login access
+     * control based on login names and on host (or domain) names, internet
+     * addresses (or network numbers), or on terminal line names in case of
+     * non-networked logins. Diagnostics are reported through syslog(3).
+     *
+     * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+     */
+#include <sys/types.h>
+#include <stdio.h>
+#include <syslog.h>
+#include <ctype.h>
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+#include <grp.h>
+#ifdef PRIMARY_GROUP_MATCH
+#include <pwd.h>
+#endif
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>		/* for inet_ntoa() */
+
+#if !defined(MAXHOSTNAMELEN) || (MAXHOSTNAMELEN < 64)
+#undef MAXHOSTNAMELEN
+#define MAXHOSTNAMELEN 256
+#endif
+
+ /* Path name of the access control file. */
+#ifndef	TABLE
+#define TABLE	"/etc/login.access"
+#endif
+
+/* Delimiters for fields and for lists of users, ttys or hosts. */
+static char fs[] = ":";		/* field separator */
+static char sep[] = ", \t";	/* list-element separator */
+
+static bool list_match (char *list, const char *item, bool (*match_fn) (const char *, const char *));
+static bool user_match (const char *tok, const char *string);
+static bool from_match (const char *tok, const char *string);
+static bool string_match (const char *tok, const char *string);
+static const char *resolve_hostname (const char *string);
+
+/* login_access - match username/group and host/tty with access control file */
+int login_access (const char *user, const char *from)
+{
+	FILE *fp;
+	char line[BUFSIZ];
+	char *perm;		/* becomes permission field */
+	char *users;		/* becomes list of login names */
+	char *froms;		/* becomes list of terminals or hosts */
+	bool match = false;
+
+	/*
+	 * Process the table one line at a time and stop at the first match.
+	 * Blank lines and lines that begin with a '#' character are ignored.
+	 * Non-comment lines are broken at the ':' character. All fields are
+	 * mandatory. The first field should be a "+" or "-" character. A
+	 * non-existing table means no access control.
+	 */
+	fp = fopen (TABLE, "r");
+	if (NULL != fp) {
+		int lineno = 0;	/* for diagnostics */
+		while (   !match
+		       && (fgets (line, (int) sizeof (line), fp) == line)) {
+			int end;
+			lineno++;
+			end = (int) strlen (line) - 1;
+			if (line[end] != '\n') {
+				SYSLOG ((LOG_ERR,
+					 "%s: line %d: missing newline or line too long",
+					 TABLE, lineno));
+				continue;
+			}
+			if (line[0] == '#') {
+				continue;	/* comment line */
+			}
+			while (end > 0 && isspace (line[end - 1])) {
+				end--;
+			}
+			line[end] = '\0';	/* strip trailing whitespace */
+			if (line[0] == '\0') {	/* skip blank lines */
+				continue;
+			}
+			if (   ((perm = strtok (line, fs)) == NULL)
+			    || ((users = strtok ((char *) 0, fs)) == NULL)
+			    || ((froms = strtok ((char *) 0, fs)) == NULL)
+			    || (strtok ((char *) 0, fs) != NULL)) {
+				SYSLOG ((LOG_ERR,
+					 "%s: line %d: bad field count",
+					 TABLE, lineno));
+				continue;
+			}
+			if (perm[0] != '+' && perm[0] != '-') {
+				SYSLOG ((LOG_ERR,
+					 "%s: line %d: bad first field",
+					 TABLE, lineno));
+				continue;
+			}
+			match = (   list_match (froms, from, from_match)
+			         && list_match (users, user, user_match));
+		}
+		(void) fclose (fp);
+	} else if (errno != ENOENT) {
+		int err = errno;
+		SYSLOG ((LOG_ERR, "cannot open %s: %s", TABLE, strerror (err)));
+	}
+	return (!match || (line[0] == '+'))?1:0;
+}
+
+/* list_match - match an item against a list of tokens with exceptions */
+static bool list_match (char *list, const char *item, bool (*match_fn) (const char *, const char*))
+{
+	char *tok;
+	bool match = false;
+
+	/*
+	 * Process tokens one at a time. We have exhausted all possible matches
+	 * when we reach an "EXCEPT" token or the end of the list. If we do find
+	 * a match, look for an "EXCEPT" list and recurse to determine whether
+	 * the match is affected by any exceptions.
+	 */
+	for (tok = strtok (list, sep); tok != NULL; tok = strtok ((char *) 0, sep)) {
+		if (strcasecmp (tok, "EXCEPT") == 0) {	/* EXCEPT: give up */
+			break;
+		}
+		match = (*match_fn) (tok, item);
+		if (match) {
+			break;
+		}
+	}
+
+	/* Process exceptions to matches. */
+	if (match) {
+		while (   ((tok = strtok ((char *) 0, sep)) != NULL)
+		       && (strcasecmp (tok, "EXCEPT") != 0))
+			/* VOID */ ;
+		if (tok == 0 || !list_match ((char *) 0, item, match_fn)) {
+			return (match);
+		}
+	}
+	return false;
+}
+
+/* myhostname - figure out local machine name */
+static char *myhostname (void)
+{
+	static char name[MAXHOSTNAMELEN + 1] = "";
+
+	if (name[0] == '\0') {
+		gethostname (name, sizeof (name));
+		name[MAXHOSTNAMELEN] = '\0';
+	}
+	return (name);
+}
+
+#if HAVE_INNETGR
+/* netgroup_match - match group against machine or user */
+static bool
+netgroup_match (const char *group, const char *machine, const char *user)
+{
+	static char *mydomain = (char *)0;
+
+	if (mydomain == (char *)0) {
+		static char domain[MAXHOSTNAMELEN + 1];
+
+		getdomainname (domain, MAXHOSTNAMELEN);
+		mydomain = domain;
+	}
+
+	return (innetgr (group, machine, user, mydomain) != 0);
+}
+#endif
+
+/* user_match - match a username against one token */
+static bool user_match (const char *tok, const char *string)
+{
+	struct group *group;
+
+#ifdef PRIMARY_GROUP_MATCH
+	struct passwd *userinf;
+#endif
+	char *at;
+
+	/*
+	 * If a token has the magic value "ALL" the match always succeeds.
+	 * Otherwise, return true if the token fully matches the username, or if
+	 * the token is a group that contains the username.
+	 */
+	at = strchr (tok + 1, '@');
+	if (NULL != at) {	/* split user@host pattern */
+		*at = '\0';
+		return (   user_match (tok, string)
+		        && from_match (at + 1, myhostname ()));
+#if HAVE_INNETGR
+	} else if (tok[0] == '@') {	/* netgroup */
+		return (netgroup_match (tok + 1, (char *) 0, string));
+#endif
+	} else if (string_match (tok, string)) {	/* ALL or exact match */
+		return true;
+	/* local, no need for xgetgrnam */
+	} else if ((group = getgrnam (tok)) != NULL) {	/* try group membership */
+		int i;
+		for (i = 0; NULL != group->gr_mem[i]; i++) {
+			if (strcasecmp (string, group->gr_mem[i]) == 0) {
+				return true;
+			}
+		}
+#ifdef PRIMARY_GROUP_MATCH
+		/*
+		 * If the string is an user whose initial GID matches the token,
+		 * accept it. May avoid excessively long lines in /etc/group.
+		 * Radu-Adrian Feurdean <raf@licj.soroscj.ro>
+		 *
+		 * XXX - disabled by default for now.  Need to verify that
+		 * getpwnam() doesn't have some nasty side effects.  --marekm
+		 */
+		/* local, no need for xgetpwnam */
+		userinf = getpwnam (string);
+		if (NULL != userinf) {
+			if (userinf->pw_gid == group->gr_gid) {
+				return true;
+			}
+		}
+#endif
+	}
+	return false;
+}
+
+static const char *resolve_hostname (const char *string)
+{
+	/*
+	 * Resolve hostname to numeric IP address, as suggested
+	 * by Dave Hagewood <admin@arrowweb.com>.  --marekm
+	 */
+	struct hostent *hp;
+
+	hp = gethostbyname (string);
+	if (NULL != hp) {
+		return inet_ntoa (*((struct in_addr *) *(hp->h_addr_list)));
+	}
+
+	SYSLOG ((LOG_ERR, "%s - unknown host", string));
+	return string;
+}
+
+/* from_match - match a host or tty against a list of tokens */
+
+static bool from_match (const char *tok, const char *string)
+{
+	size_t tok_len;
+
+	/*
+	 * If a token has the magic value "ALL" the match always succeeds. Return
+	 * true if the token fully matches the string. If the token is a domain
+	 * name, return true if it matches the last fields of the string. If the
+	 * token has the magic value "LOCAL", return true if the string does not
+	 * contain a "." character. If the token is a network number, return true
+	 * if it matches the head of the string.
+	 */
+#if HAVE_INNETGR
+	if (tok[0] == '@') {	/* netgroup */
+		return (netgroup_match (tok + 1, string, (char *) 0));
+	} else
+#endif
+	if (string_match (tok, string)) {	/* ALL or exact match */
+		return true;
+	} else if (tok[0] == '.') {	/* domain: match last fields */
+		size_t str_len;
+		str_len = strlen (string);
+		tok_len = strlen (tok);
+		if (   (str_len > tok_len)
+		    && (strcasecmp (tok, string + str_len - tok_len) == 0)) {
+			return true;
+		}
+	} else if (strcasecmp (tok, "LOCAL") == 0) {	/* local: no dots */
+		if (strchr (string, '.') == NULL) {
+			return true;
+		}
+	} else if (   (tok[(tok_len = strlen (tok)) - 1] == '.') /* network */
+		   && (strncmp (tok, resolve_hostname (string), tok_len) == 0)) {
+		return true;
+	}
+	return false;
+}
+
+/* string_match - match a string against one token */
+static bool string_match (const char *tok, const char *string)
+{
+
+	/*
+	 * If the token has the magic value "ALL" the match always succeeds.
+	 * Otherwise, return true if the token fully matches the string.
+	 */
+	if (strcasecmp (tok, "ALL") == 0) {	/* all: always matches */
+		return true;
+	} else if (strcasecmp (tok, string) == 0) {	/* try exact match */
+		return true;
+	}
+	return false;
+}
+
+#else				/* !USE_PAM */
+extern int errno;		/* warning: ANSI C forbids an empty source file */
+#endif				/* !USE_PAM */