2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * As far as I am concerned, the code I have written for this software
6 * can be used freely for any purpose. Any derived versions of this
7 * software must be clearly marked as such, and if the derived work is
8 * incompatible with the protocol description in the RFC file, it must be
9 * called by a name other than "ssh" or "Secure Shell".
13 RCSID("$OpenBSD: auth-options.c,v 1.33 2005/12/08 18:34:11 reyk Exp $");
20 #include "auth-options.h"
23 #include "monitor_wrap.h"
26 /* Flags set authorized_keys flags */
27 int no_port_forwarding_flag = 0;
28 int no_agent_forwarding_flag = 0;
29 int no_x11_forwarding_flag = 0;
32 /* "command=" option. */
33 char *forced_command = NULL;
35 /* "environment=" options. */
36 struct envstring *custom_environment = NULL;
38 /* "tunnel=" option. */
39 int forced_tun_device = -1;
41 extern ServerOptions options;
44 auth_clear_options(void)
46 no_agent_forwarding_flag = 0;
47 no_port_forwarding_flag = 0;
49 no_x11_forwarding_flag = 0;
50 while (custom_environment) {
51 struct envstring *ce = custom_environment;
52 custom_environment = ce->next;
57 xfree(forced_command);
58 forced_command = NULL;
60 forced_tun_device = -1;
61 channel_clear_permitted_opens();
66 * return 1 if access is granted, 0 if not.
67 * side effect: sets key option flags
70 auth_parse_options(struct passwd *pw, char *opts, char *file, u_long linenum)
81 while (*opts && *opts != ' ' && *opts != '\t') {
82 cp = "no-port-forwarding";
83 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
84 auth_debug_add("Port forwarding disabled.");
85 no_port_forwarding_flag = 1;
89 cp = "no-agent-forwarding";
90 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
91 auth_debug_add("Agent forwarding disabled.");
92 no_agent_forwarding_flag = 1;
96 cp = "no-X11-forwarding";
97 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
98 auth_debug_add("X11 forwarding disabled.");
99 no_x11_forwarding_flag = 1;
104 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
105 auth_debug_add("Pty allocation disabled.");
111 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
113 forced_command = xmalloc(strlen(opts) + 1);
118 if (*opts == '\\' && opts[1] == '"') {
120 forced_command[i++] = '"';
123 forced_command[i++] = *opts++;
126 debug("%.100s, line %lu: missing end quote",
128 auth_debug_add("%.100s, line %lu: missing end quote",
130 xfree(forced_command);
131 forced_command = NULL;
134 forced_command[i] = 0;
135 auth_debug_add("Forced command: %.900s", forced_command);
139 cp = "environment=\"";
140 if (options.permit_user_env &&
141 strncasecmp(opts, cp, strlen(cp)) == 0) {
143 struct envstring *new_envstring;
146 s = xmalloc(strlen(opts) + 1);
151 if (*opts == '\\' && opts[1] == '"') {
159 debug("%.100s, line %lu: missing end quote",
161 auth_debug_add("%.100s, line %lu: missing end quote",
167 auth_debug_add("Adding to environment: %.900s", s);
168 debug("Adding to environment: %.900s", s);
170 new_envstring = xmalloc(sizeof(struct envstring));
171 new_envstring->s = s;
172 new_envstring->next = custom_environment;
173 custom_environment = new_envstring;
177 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
178 const char *remote_ip = get_remote_ipaddr();
179 const char *remote_host = get_canonical_hostname(
181 char *patterns = xmalloc(strlen(opts) + 1);
188 if (*opts == '\\' && opts[1] == '"') {
193 patterns[i++] = *opts++;
196 debug("%.100s, line %lu: missing end quote",
198 auth_debug_add("%.100s, line %lu: missing end quote",
205 if (match_host_and_ip(remote_host, remote_ip,
208 logit("Authentication tried for %.100s with "
209 "correct key but not from a permitted "
210 "host (host=%.200s, ip=%.200s).",
211 pw->pw_name, remote_host, remote_ip);
212 auth_debug_add("Your host '%.200s' is not "
213 "permitted to use this key for login.",
219 /* Host name matches. */
222 cp = "permitopen=\"";
223 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
226 char *patterns = xmalloc(strlen(opts) + 1);
233 if (*opts == '\\' && opts[1] == '"') {
238 patterns[i++] = *opts++;
241 debug("%.100s, line %lu: missing end quote",
243 auth_debug_add("%.100s, line %lu: missing "
244 "end quote", file, linenum);
252 if (host == NULL || strlen(host) >= NI_MAXHOST) {
253 debug("%.100s, line %lu: Bad permitopen "
254 "specification <%.100s>", file, linenum,
256 auth_debug_add("%.100s, line %lu: "
257 "Bad permitopen specification", file,
262 host = cleanhostname(host);
263 if (p == NULL || (port = a2port(p)) == 0) {
264 debug("%.100s, line %lu: Bad permitopen port "
265 "<%.100s>", file, linenum, p ? p : "");
266 auth_debug_add("%.100s, line %lu: "
267 "Bad permitopen port", file, linenum);
271 if (options.allow_tcp_forwarding)
272 channel_add_permitted_opens(host, port);
277 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
280 tun = xmalloc(strlen(opts) + 1);
288 debug("%.100s, line %lu: missing end quote",
290 auth_debug_add("%.100s, line %lu: missing end quote",
293 forced_tun_device = -1;
297 forced_tun_device = a2tun(tun, NULL);
299 if (forced_tun_device == SSH_TUNID_ERR) {
300 debug("%.100s, line %lu: invalid tun device",
302 auth_debug_add("%.100s, line %lu: invalid tun device",
304 forced_tun_device = -1;
307 auth_debug_add("Forced tun device: %d", forced_tun_device);
313 * Skip the comma, and move to the next option
314 * (or break out if there are no more).
317 fatal("Bugs in auth-options.c option processing.");
318 if (*opts == ' ' || *opts == '\t')
319 break; /* End of options. */
323 /* Process the next option. */
333 logit("Bad options in %.100s file, line %lu: %.50s",
334 file, linenum, opts);
335 auth_debug_add("Bad options in %.100s file, line %lu: %.50s",
336 file, linenum, opts);