X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/b5c334cca53c7bd1dfa559da8208bacb9c476cd0..d4b8c904a6466bbff96705bd8e16f47d72bf71c1:/auth-options.c

diff --git a/auth-options.c b/auth-options.c
index ef61d8df..ab085c23 100644
--- a/auth-options.c
+++ b/auth-options.c
@@ -1,3 +1,4 @@
+/* $OpenBSD: auth-options.c,v 1.44 2009/01/22 10:09:16 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -10,18 +11,39 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: auth-options.c,v 1.8 2001/01/13 18:38:00 markus Exp $");
 
-#include "ssh.h"
-#include "packet.h"
+#include <sys/types.h>
+
+#include <netdb.h>
+#include <pwd.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "openbsd-compat/sys-queue.h"
 #include "xmalloc.h"
 #include "match.h"
+#include "log.h"
+#include "canohost.h"
+#include "buffer.h"
+#include "channels.h"
+#include "auth-options.h"
+#include "servconf.h"
+#include "misc.h"
+#include "key.h"
+#include "hostfile.h"
+#include "auth.h"
+#ifdef GSSAPI
+#include "ssh-gss.h"
+#endif
+#include "monitor_wrap.h"
 
 /* Flags set authorized_keys flags */
 int no_port_forwarding_flag = 0;
 int no_agent_forwarding_flag = 0;
 int no_x11_forwarding_flag = 0;
 int no_pty_flag = 0;
+int no_user_rc = 0;
 
 /* "command=" option. */
 char *forced_command = NULL;
@@ -29,6 +51,11 @@ char *forced_command = NULL;
 /* "environment=" options. */
 struct envstring *custom_environment = NULL;
 
+/* "tunnel=" option. */
+int forced_tun_device = -1;
+
+extern ServerOptions options;
+
 void
 auth_clear_options(void)
 {
@@ -36,6 +63,7 @@ auth_clear_options(void)
 	no_port_forwarding_flag = 0;
 	no_pty_flag = 0;
 	no_x11_forwarding_flag = 0;
+	no_user_rc = 0;
 	while (custom_environment) {
 		struct envstring *ce = custom_environment;
 		custom_environment = ce->next;
@@ -46,105 +74,123 @@ auth_clear_options(void)
 		xfree(forced_command);
 		forced_command = NULL;
 	}
+	forced_tun_device = -1;
+	channel_clear_permitted_opens();
+	auth_debug_reset();
 }
 
-/* return 1 if access is granted, 0 if not. side effect: sets key option flags */
+/*
+ * return 1 if access is granted, 0 if not.
+ * side effect: sets key option flags
+ */
 int
-auth_parse_options(struct passwd *pw, char *options, u_long linenum)
+auth_parse_options(struct passwd *pw, char *opts, char *file, u_long linenum)
 {
 	const char *cp;
-	if (!options)
-		return 1;
+	int i;
 
 	/* reset options */
 	auth_clear_options();
 
-	while (*options && *options != ' ' && *options != '\t') {
+	if (!opts)
+		return 1;
+
+	while (*opts && *opts != ' ' && *opts != '\t') {
 		cp = "no-port-forwarding";
-		if (strncasecmp(options, cp, strlen(cp)) == 0) {
-			packet_send_debug("Port forwarding disabled.");
+		if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+			auth_debug_add("Port forwarding disabled.");
 			no_port_forwarding_flag = 1;
-			options += strlen(cp);
+			opts += strlen(cp);
 			goto next_option;
 		}
 		cp = "no-agent-forwarding";
-		if (strncasecmp(options, cp, strlen(cp)) == 0) {
-			packet_send_debug("Agent forwarding disabled.");
+		if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+			auth_debug_add("Agent forwarding disabled.");
 			no_agent_forwarding_flag = 1;
-			options += strlen(cp);
+			opts += strlen(cp);
 			goto next_option;
 		}
 		cp = "no-X11-forwarding";
-		if (strncasecmp(options, cp, strlen(cp)) == 0) {
-			packet_send_debug("X11 forwarding disabled.");
+		if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+			auth_debug_add("X11 forwarding disabled.");
 			no_x11_forwarding_flag = 1;
-			options += strlen(cp);
+			opts += strlen(cp);
 			goto next_option;
 		}
 		cp = "no-pty";
-		if (strncasecmp(options, cp, strlen(cp)) == 0) {
-			packet_send_debug("Pty allocation disabled.");
+		if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+			auth_debug_add("Pty allocation disabled.");
 			no_pty_flag = 1;
-			options += strlen(cp);
+			opts += strlen(cp);
+			goto next_option;
+		}
+		cp = "no-user-rc";
+		if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+			auth_debug_add("User rc file execution disabled.");
+			no_user_rc = 1;
+			opts += strlen(cp);
 			goto next_option;
 		}
 		cp = "command=\"";
-		if (strncasecmp(options, cp, strlen(cp)) == 0) {
-			int i;
-			options += strlen(cp);
-			forced_command = xmalloc(strlen(options) + 1);
+		if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+			opts += strlen(cp);
+			forced_command = xmalloc(strlen(opts) + 1);
 			i = 0;
-			while (*options) {
-				if (*options == '"')
+			while (*opts) {
+				if (*opts == '"')
 					break;
-				if (*options == '\\' && options[1] == '"') {
-					options += 2;
+				if (*opts == '\\' && opts[1] == '"') {
+					opts += 2;
 					forced_command[i++] = '"';
 					continue;
 				}
-				forced_command[i++] = *options++;
+				forced_command[i++] = *opts++;
 			}
-			if (!*options) {
+			if (!*opts) {
 				debug("%.100s, line %lu: missing end quote",
-				    SSH_USER_PERMITTED_KEYS, linenum);
-				packet_send_debug("%.100s, line %lu: missing end quote",
-				    SSH_USER_PERMITTED_KEYS, linenum);
-				continue;
+				    file, linenum);
+				auth_debug_add("%.100s, line %lu: missing end quote",
+				    file, linenum);
+				xfree(forced_command);
+				forced_command = NULL;
+				goto bad_option;
 			}
-			forced_command[i] = 0;
-			packet_send_debug("Forced command: %.900s", forced_command);
-			options++;
+			forced_command[i] = '\0';
+			auth_debug_add("Forced command: %.900s", forced_command);
+			opts++;
 			goto next_option;
 		}
 		cp = "environment=\"";
-		if (strncasecmp(options, cp, strlen(cp)) == 0) {
-			int i;
+		if (options.permit_user_env &&
+		    strncasecmp(opts, cp, strlen(cp)) == 0) {
 			char *s;
 			struct envstring *new_envstring;
-			options += strlen(cp);
-			s = xmalloc(strlen(options) + 1);
+
+			opts += strlen(cp);
+			s = xmalloc(strlen(opts) + 1);
 			i = 0;
-			while (*options) {
-				if (*options == '"')
+			while (*opts) {
+				if (*opts == '"')
 					break;
-				if (*options == '\\' && options[1] == '"') {
-					options += 2;
+				if (*opts == '\\' && opts[1] == '"') {
+					opts += 2;
 					s[i++] = '"';
 					continue;
 				}
-				s[i++] = *options++;
+				s[i++] = *opts++;
 			}
-			if (!*options) {
+			if (!*opts) {
 				debug("%.100s, line %lu: missing end quote",
-				    SSH_USER_PERMITTED_KEYS, linenum);
-				packet_send_debug("%.100s, line %lu: missing end quote",
-				    SSH_USER_PERMITTED_KEYS, linenum);
-				continue;
+				    file, linenum);
+				auth_debug_add("%.100s, line %lu: missing end quote",
+				    file, linenum);
+				xfree(s);
+				goto bad_option;
 			}
-			s[i] = 0;
-			packet_send_debug("Adding to environment: %.900s", s);
+			s[i] = '\0';
+			auth_debug_add("Adding to environment: %.900s", s);
 			debug("Adding to environment: %.900s", s);
-			options++;
+			opts++;
 			new_envstring = xmalloc(sizeof(struct envstring));
 			new_envstring->s = s;
 			new_envstring->next = custom_environment;
@@ -152,52 +198,147 @@ auth_parse_options(struct passwd *pw, char *options, u_long linenum)
 			goto next_option;
 		}
 		cp = "from=\"";
-		if (strncasecmp(options, cp, strlen(cp)) == 0) {
-			int mname, mip;
-			char *patterns = xmalloc(strlen(options) + 1);
-			int i;
-			options += strlen(cp);
+		if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+			const char *remote_ip = get_remote_ipaddr();
+			const char *remote_host = get_canonical_hostname(
+			    options.use_dns);
+			char *patterns = xmalloc(strlen(opts) + 1);
+
+			opts += strlen(cp);
 			i = 0;
-			while (*options) {
-				if (*options == '"')
+			while (*opts) {
+				if (*opts == '"')
 					break;
-				if (*options == '\\' && options[1] == '"') {
-					options += 2;
+				if (*opts == '\\' && opts[1] == '"') {
+					opts += 2;
 					patterns[i++] = '"';
 					continue;
 				}
-				patterns[i++] = *options++;
+				patterns[i++] = *opts++;
 			}
-			if (!*options) {
+			if (!*opts) {
 				debug("%.100s, line %lu: missing end quote",
-				    SSH_USER_PERMITTED_KEYS, linenum);
-				packet_send_debug("%.100s, line %lu: missing end quote",
-				    SSH_USER_PERMITTED_KEYS, linenum);
-				continue;
+				    file, linenum);
+				auth_debug_add("%.100s, line %lu: missing end quote",
+				    file, linenum);
+				xfree(patterns);
+				goto bad_option;
 			}
-			patterns[i] = 0;
-			options++;
-			/*
-			 * Deny access if we get a negative
-			 * match for the hostname or the ip
-			 * or if we get not match at all
-			 */
-			mname = match_hostname(get_canonical_hostname(),
-			    patterns, strlen(patterns));
-			mip = match_hostname(get_remote_ipaddr(),
-			    patterns, strlen(patterns));
+			patterns[i] = '\0';
+			opts++;
+			switch (match_host_and_ip(remote_host, remote_ip,
+			    patterns)) {
+			case 1:
+				xfree(patterns);
+				/* Host name matches. */
+				goto next_option;
+			case -1:
+				debug("%.100s, line %lu: invalid criteria",
+				    file, linenum);
+				auth_debug_add("%.100s, line %lu: "
+				    "invalid criteria", file, linenum);
+				/* FALLTHROUGH */
+			case 0:
+				xfree(patterns);
+				logit("Authentication tried for %.100s with "
+				    "correct key but not from a permitted "
+				    "host (host=%.200s, ip=%.200s).",
+				    pw->pw_name, remote_host, remote_ip);
+				auth_debug_add("Your host '%.200s' is not "
+				    "permitted to use this key for login.",
+				    remote_host);
+				break;
+			}
+			/* deny access */
+			return 0;
+		}
+		cp = "permitopen=\"";
+		if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+			char *host, *p;
+			int port;
+			char *patterns = xmalloc(strlen(opts) + 1);
+
+			opts += strlen(cp);
+			i = 0;
+			while (*opts) {
+				if (*opts == '"')
+					break;
+				if (*opts == '\\' && opts[1] == '"') {
+					opts += 2;
+					patterns[i++] = '"';
+					continue;
+				}
+				patterns[i++] = *opts++;
+			}
+			if (!*opts) {
+				debug("%.100s, line %lu: missing end quote",
+				    file, linenum);
+				auth_debug_add("%.100s, line %lu: missing "
+				    "end quote", file, linenum);
+				xfree(patterns);
+				goto bad_option;
+			}
+			patterns[i] = '\0';
+			opts++;
+			p = patterns;
+			host = hpdelim(&p);
+			if (host == NULL || strlen(host) >= NI_MAXHOST) {
+				debug("%.100s, line %lu: Bad permitopen "
+				    "specification <%.100s>", file, linenum,
+				    patterns);
+				auth_debug_add("%.100s, line %lu: "
+				    "Bad permitopen specification", file,
+				    linenum);
+				xfree(patterns);
+				goto bad_option;
+			}
+			host = cleanhostname(host);
+			if (p == NULL || (port = a2port(p)) <= 0) {
+				debug("%.100s, line %lu: Bad permitopen port "
+				    "<%.100s>", file, linenum, p ? p : "");
+				auth_debug_add("%.100s, line %lu: "
+				    "Bad permitopen port", file, linenum);
+				xfree(patterns);
+				goto bad_option;
+			}
+			if (options.allow_tcp_forwarding)
+				channel_add_permitted_opens(host, port);
 			xfree(patterns);
-			if (mname == -1 || mip == -1 ||
-			    (mname != 1 && mip != 1)) {
-				log("Authentication tried for %.100s with correct key but not from a permitted host (host=%.200s, ip=%.200s).",
-				    pw->pw_name, get_canonical_hostname(),
-				    get_remote_ipaddr());
-				packet_send_debug("Your host '%.200s' is not permitted to use this key for login.",
-				get_canonical_hostname());
-				/* deny access */
-				return 0;
+			goto next_option;
+		}
+		cp = "tunnel=\"";
+		if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+			char *tun = NULL;
+			opts += strlen(cp);
+			tun = xmalloc(strlen(opts) + 1);
+			i = 0;
+			while (*opts) {
+				if (*opts == '"')
+					break;
+				tun[i++] = *opts++;
+			}
+			if (!*opts) {
+				debug("%.100s, line %lu: missing end quote",
+				    file, linenum);
+				auth_debug_add("%.100s, line %lu: missing end quote",
+				    file, linenum);
+				xfree(tun);
+				forced_tun_device = -1;
+				goto bad_option;
+			}
+			tun[i] = '\0';
+			forced_tun_device = a2tun(tun, NULL);
+			xfree(tun);
+			if (forced_tun_device == SSH_TUNID_ERR) {
+				debug("%.100s, line %lu: invalid tun device",
+				    file, linenum);
+				auth_debug_add("%.100s, line %lu: invalid tun device",
+				    file, linenum);
+				forced_tun_device = -1;
+				goto bad_option;
 			}
-			/* Host name matches. */
+			auth_debug_add("Forced tun device: %d", forced_tun_device);
+			opts++;
 			goto next_option;
 		}
 next_option:
@@ -205,23 +346,31 @@ next_option:
 		 * Skip the comma, and move to the next option
 		 * (or break out if there are no more).
 		 */
-		if (!*options)
+		if (!*opts)
 			fatal("Bugs in auth-options.c option processing.");
-		if (*options == ' ' || *options == '\t')
+		if (*opts == ' ' || *opts == '\t')
 			break;		/* End of options. */
-		if (*options != ',')
+		if (*opts != ',')
 			goto bad_option;
-		options++;
+		opts++;
 		/* Process the next option. */
 	}
+
+	if (!use_privsep)
+		auth_debug_send();
+
 	/* grant access */
 	return 1;
 
 bad_option:
-	log("Bad options in %.100s file, line %lu: %.50s",
-	    SSH_USER_PERMITTED_KEYS, linenum, options);
-	packet_send_debug("Bad options in %.100s file, line %lu: %.50s",
-	    SSH_USER_PERMITTED_KEYS, linenum, options);
+	logit("Bad options in %.100s file, line %lu: %.50s",
+	    file, linenum, opts);
+	auth_debug_add("Bad options in %.100s file, line %lu: %.50s",
+	    file, linenum, opts);
+
+	if (!use_privsep)
+		auth_debug_send();
+
 	/* deny access */
 	return 0;
 }