1 /* $OpenBSD: auth-options.c,v 1.36 2006/07/06 16:03:53 stevesk Exp $ */
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * As far as I am concerned, the code I have written for this software
7 * can be used freely for any purpose. Any derived versions of this
8 * software must be clearly marked as such, and if the derived work is
9 * incompatible with the protocol description in the RFC file, it must be
10 * called by a name other than "ssh" or "Secure Shell".
15 #include <sys/types.h>
24 #include "auth-options.h"
27 #include "monitor_wrap.h"
30 /* Flags set authorized_keys flags */
31 int no_port_forwarding_flag = 0;
32 int no_agent_forwarding_flag = 0;
33 int no_x11_forwarding_flag = 0;
36 /* "command=" option. */
37 char *forced_command = NULL;
39 /* "environment=" options. */
40 struct envstring *custom_environment = NULL;
42 /* "tunnel=" option. */
43 int forced_tun_device = -1;
45 extern ServerOptions options;
48 auth_clear_options(void)
50 no_agent_forwarding_flag = 0;
51 no_port_forwarding_flag = 0;
53 no_x11_forwarding_flag = 0;
54 while (custom_environment) {
55 struct envstring *ce = custom_environment;
56 custom_environment = ce->next;
61 xfree(forced_command);
62 forced_command = NULL;
64 forced_tun_device = -1;
65 channel_clear_permitted_opens();
70 * return 1 if access is granted, 0 if not.
71 * side effect: sets key option flags
74 auth_parse_options(struct passwd *pw, char *opts, char *file, u_long linenum)
85 while (*opts && *opts != ' ' && *opts != '\t') {
86 cp = "no-port-forwarding";
87 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
88 auth_debug_add("Port forwarding disabled.");
89 no_port_forwarding_flag = 1;
93 cp = "no-agent-forwarding";
94 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
95 auth_debug_add("Agent forwarding disabled.");
96 no_agent_forwarding_flag = 1;
100 cp = "no-X11-forwarding";
101 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
102 auth_debug_add("X11 forwarding disabled.");
103 no_x11_forwarding_flag = 1;
108 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
109 auth_debug_add("Pty allocation disabled.");
115 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
117 forced_command = xmalloc(strlen(opts) + 1);
122 if (*opts == '\\' && opts[1] == '"') {
124 forced_command[i++] = '"';
127 forced_command[i++] = *opts++;
130 debug("%.100s, line %lu: missing end quote",
132 auth_debug_add("%.100s, line %lu: missing end quote",
134 xfree(forced_command);
135 forced_command = NULL;
138 forced_command[i] = 0;
139 auth_debug_add("Forced command: %.900s", forced_command);
143 cp = "environment=\"";
144 if (options.permit_user_env &&
145 strncasecmp(opts, cp, strlen(cp)) == 0) {
147 struct envstring *new_envstring;
150 s = xmalloc(strlen(opts) + 1);
155 if (*opts == '\\' && opts[1] == '"') {
163 debug("%.100s, line %lu: missing end quote",
165 auth_debug_add("%.100s, line %lu: missing end quote",
171 auth_debug_add("Adding to environment: %.900s", s);
172 debug("Adding to environment: %.900s", s);
174 new_envstring = xmalloc(sizeof(struct envstring));
175 new_envstring->s = s;
176 new_envstring->next = custom_environment;
177 custom_environment = new_envstring;
181 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
182 const char *remote_ip = get_remote_ipaddr();
183 const char *remote_host = get_canonical_hostname(
185 char *patterns = xmalloc(strlen(opts) + 1);
192 if (*opts == '\\' && opts[1] == '"') {
197 patterns[i++] = *opts++;
200 debug("%.100s, line %lu: missing end quote",
202 auth_debug_add("%.100s, line %lu: missing end quote",
209 if (match_host_and_ip(remote_host, remote_ip,
212 logit("Authentication tried for %.100s with "
213 "correct key but not from a permitted "
214 "host (host=%.200s, ip=%.200s).",
215 pw->pw_name, remote_host, remote_ip);
216 auth_debug_add("Your host '%.200s' is not "
217 "permitted to use this key for login.",
223 /* Host name matches. */
226 cp = "permitopen=\"";
227 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
230 char *patterns = xmalloc(strlen(opts) + 1);
237 if (*opts == '\\' && opts[1] == '"') {
242 patterns[i++] = *opts++;
245 debug("%.100s, line %lu: missing end quote",
247 auth_debug_add("%.100s, line %lu: missing "
248 "end quote", file, linenum);
256 if (host == NULL || strlen(host) >= NI_MAXHOST) {
257 debug("%.100s, line %lu: Bad permitopen "
258 "specification <%.100s>", file, linenum,
260 auth_debug_add("%.100s, line %lu: "
261 "Bad permitopen specification", file,
266 host = cleanhostname(host);
267 if (p == NULL || (port = a2port(p)) == 0) {
268 debug("%.100s, line %lu: Bad permitopen port "
269 "<%.100s>", file, linenum, p ? p : "");
270 auth_debug_add("%.100s, line %lu: "
271 "Bad permitopen port", file, linenum);
275 if (options.allow_tcp_forwarding)
276 channel_add_permitted_opens(host, port);
281 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
284 tun = xmalloc(strlen(opts) + 1);
292 debug("%.100s, line %lu: missing end quote",
294 auth_debug_add("%.100s, line %lu: missing end quote",
297 forced_tun_device = -1;
301 forced_tun_device = a2tun(tun, NULL);
303 if (forced_tun_device == SSH_TUNID_ERR) {
304 debug("%.100s, line %lu: invalid tun device",
306 auth_debug_add("%.100s, line %lu: invalid tun device",
308 forced_tun_device = -1;
311 auth_debug_add("Forced tun device: %d", forced_tun_device);
317 * Skip the comma, and move to the next option
318 * (or break out if there are no more).
321 fatal("Bugs in auth-options.c option processing.");
322 if (*opts == ' ' || *opts == '\t')
323 break; /* End of options. */
327 /* Process the next option. */
337 logit("Bad options in %.100s file, line %lu: %.50s",
338 file, linenum, opts);
339 auth_debug_add("Bad options in %.100s file, line %lu: %.50s",
340 file, linenum, opts);