utilities - Temporary map out libevtr, ktrdump, and evtranalyze from x86_64
[dragonfly.git] / crypto / openssh / auth-options.c
blobab085c2339cc7bba259619d7181b1cce3c151a43
1 /* $OpenBSD: auth-options.c,v 1.44 2009/01/22 10:09:16 djm Exp $ */
2 /*
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
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".
13 #include "includes.h"
15 #include <sys/types.h>
17 #include <netdb.h>
18 #include <pwd.h>
19 #include <string.h>
20 #include <stdio.h>
21 #include <stdarg.h>
23 #include "openbsd-compat/sys-queue.h"
24 #include "xmalloc.h"
25 #include "match.h"
26 #include "log.h"
27 #include "canohost.h"
28 #include "buffer.h"
29 #include "channels.h"
30 #include "auth-options.h"
31 #include "servconf.h"
32 #include "misc.h"
33 #include "key.h"
34 #include "hostfile.h"
35 #include "auth.h"
36 #ifdef GSSAPI
37 #include "ssh-gss.h"
38 #endif
39 #include "monitor_wrap.h"
41 /* Flags set authorized_keys flags */
42 int no_port_forwarding_flag = 0;
43 int no_agent_forwarding_flag = 0;
44 int no_x11_forwarding_flag = 0;
45 int no_pty_flag = 0;
46 int no_user_rc = 0;
48 /* "command=" option. */
49 char *forced_command = NULL;
51 /* "environment=" options. */
52 struct envstring *custom_environment = NULL;
54 /* "tunnel=" option. */
55 int forced_tun_device = -1;
57 extern ServerOptions options;
59 void
60 auth_clear_options(void)
62 no_agent_forwarding_flag = 0;
63 no_port_forwarding_flag = 0;
64 no_pty_flag = 0;
65 no_x11_forwarding_flag = 0;
66 no_user_rc = 0;
67 while (custom_environment) {
68 struct envstring *ce = custom_environment;
69 custom_environment = ce->next;
70 xfree(ce->s);
71 xfree(ce);
73 if (forced_command) {
74 xfree(forced_command);
75 forced_command = NULL;
77 forced_tun_device = -1;
78 channel_clear_permitted_opens();
79 auth_debug_reset();
83 * return 1 if access is granted, 0 if not.
84 * side effect: sets key option flags
86 int
87 auth_parse_options(struct passwd *pw, char *opts, char *file, u_long linenum)
89 const char *cp;
90 int i;
92 /* reset options */
93 auth_clear_options();
95 if (!opts)
96 return 1;
98 while (*opts && *opts != ' ' && *opts != '\t') {
99 cp = "no-port-forwarding";
100 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
101 auth_debug_add("Port forwarding disabled.");
102 no_port_forwarding_flag = 1;
103 opts += strlen(cp);
104 goto next_option;
106 cp = "no-agent-forwarding";
107 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
108 auth_debug_add("Agent forwarding disabled.");
109 no_agent_forwarding_flag = 1;
110 opts += strlen(cp);
111 goto next_option;
113 cp = "no-X11-forwarding";
114 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
115 auth_debug_add("X11 forwarding disabled.");
116 no_x11_forwarding_flag = 1;
117 opts += strlen(cp);
118 goto next_option;
120 cp = "no-pty";
121 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
122 auth_debug_add("Pty allocation disabled.");
123 no_pty_flag = 1;
124 opts += strlen(cp);
125 goto next_option;
127 cp = "no-user-rc";
128 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
129 auth_debug_add("User rc file execution disabled.");
130 no_user_rc = 1;
131 opts += strlen(cp);
132 goto next_option;
134 cp = "command=\"";
135 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
136 opts += strlen(cp);
137 forced_command = xmalloc(strlen(opts) + 1);
138 i = 0;
139 while (*opts) {
140 if (*opts == '"')
141 break;
142 if (*opts == '\\' && opts[1] == '"') {
143 opts += 2;
144 forced_command[i++] = '"';
145 continue;
147 forced_command[i++] = *opts++;
149 if (!*opts) {
150 debug("%.100s, line %lu: missing end quote",
151 file, linenum);
152 auth_debug_add("%.100s, line %lu: missing end quote",
153 file, linenum);
154 xfree(forced_command);
155 forced_command = NULL;
156 goto bad_option;
158 forced_command[i] = '\0';
159 auth_debug_add("Forced command: %.900s", forced_command);
160 opts++;
161 goto next_option;
163 cp = "environment=\"";
164 if (options.permit_user_env &&
165 strncasecmp(opts, cp, strlen(cp)) == 0) {
166 char *s;
167 struct envstring *new_envstring;
169 opts += strlen(cp);
170 s = xmalloc(strlen(opts) + 1);
171 i = 0;
172 while (*opts) {
173 if (*opts == '"')
174 break;
175 if (*opts == '\\' && opts[1] == '"') {
176 opts += 2;
177 s[i++] = '"';
178 continue;
180 s[i++] = *opts++;
182 if (!*opts) {
183 debug("%.100s, line %lu: missing end quote",
184 file, linenum);
185 auth_debug_add("%.100s, line %lu: missing end quote",
186 file, linenum);
187 xfree(s);
188 goto bad_option;
190 s[i] = '\0';
191 auth_debug_add("Adding to environment: %.900s", s);
192 debug("Adding to environment: %.900s", s);
193 opts++;
194 new_envstring = xmalloc(sizeof(struct envstring));
195 new_envstring->s = s;
196 new_envstring->next = custom_environment;
197 custom_environment = new_envstring;
198 goto next_option;
200 cp = "from=\"";
201 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
202 const char *remote_ip = get_remote_ipaddr();
203 const char *remote_host = get_canonical_hostname(
204 options.use_dns);
205 char *patterns = xmalloc(strlen(opts) + 1);
207 opts += strlen(cp);
208 i = 0;
209 while (*opts) {
210 if (*opts == '"')
211 break;
212 if (*opts == '\\' && opts[1] == '"') {
213 opts += 2;
214 patterns[i++] = '"';
215 continue;
217 patterns[i++] = *opts++;
219 if (!*opts) {
220 debug("%.100s, line %lu: missing end quote",
221 file, linenum);
222 auth_debug_add("%.100s, line %lu: missing end quote",
223 file, linenum);
224 xfree(patterns);
225 goto bad_option;
227 patterns[i] = '\0';
228 opts++;
229 switch (match_host_and_ip(remote_host, remote_ip,
230 patterns)) {
231 case 1:
232 xfree(patterns);
233 /* Host name matches. */
234 goto next_option;
235 case -1:
236 debug("%.100s, line %lu: invalid criteria",
237 file, linenum);
238 auth_debug_add("%.100s, line %lu: "
239 "invalid criteria", file, linenum);
240 /* FALLTHROUGH */
241 case 0:
242 xfree(patterns);
243 logit("Authentication tried for %.100s with "
244 "correct key but not from a permitted "
245 "host (host=%.200s, ip=%.200s).",
246 pw->pw_name, remote_host, remote_ip);
247 auth_debug_add("Your host '%.200s' is not "
248 "permitted to use this key for login.",
249 remote_host);
250 break;
252 /* deny access */
253 return 0;
255 cp = "permitopen=\"";
256 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
257 char *host, *p;
258 int port;
259 char *patterns = xmalloc(strlen(opts) + 1);
261 opts += strlen(cp);
262 i = 0;
263 while (*opts) {
264 if (*opts == '"')
265 break;
266 if (*opts == '\\' && opts[1] == '"') {
267 opts += 2;
268 patterns[i++] = '"';
269 continue;
271 patterns[i++] = *opts++;
273 if (!*opts) {
274 debug("%.100s, line %lu: missing end quote",
275 file, linenum);
276 auth_debug_add("%.100s, line %lu: missing "
277 "end quote", file, linenum);
278 xfree(patterns);
279 goto bad_option;
281 patterns[i] = '\0';
282 opts++;
283 p = patterns;
284 host = hpdelim(&p);
285 if (host == NULL || strlen(host) >= NI_MAXHOST) {
286 debug("%.100s, line %lu: Bad permitopen "
287 "specification <%.100s>", file, linenum,
288 patterns);
289 auth_debug_add("%.100s, line %lu: "
290 "Bad permitopen specification", file,
291 linenum);
292 xfree(patterns);
293 goto bad_option;
295 host = cleanhostname(host);
296 if (p == NULL || (port = a2port(p)) <= 0) {
297 debug("%.100s, line %lu: Bad permitopen port "
298 "<%.100s>", file, linenum, p ? p : "");
299 auth_debug_add("%.100s, line %lu: "
300 "Bad permitopen port", file, linenum);
301 xfree(patterns);
302 goto bad_option;
304 if (options.allow_tcp_forwarding)
305 channel_add_permitted_opens(host, port);
306 xfree(patterns);
307 goto next_option;
309 cp = "tunnel=\"";
310 if (strncasecmp(opts, cp, strlen(cp)) == 0) {
311 char *tun = NULL;
312 opts += strlen(cp);
313 tun = xmalloc(strlen(opts) + 1);
314 i = 0;
315 while (*opts) {
316 if (*opts == '"')
317 break;
318 tun[i++] = *opts++;
320 if (!*opts) {
321 debug("%.100s, line %lu: missing end quote",
322 file, linenum);
323 auth_debug_add("%.100s, line %lu: missing end quote",
324 file, linenum);
325 xfree(tun);
326 forced_tun_device = -1;
327 goto bad_option;
329 tun[i] = '\0';
330 forced_tun_device = a2tun(tun, NULL);
331 xfree(tun);
332 if (forced_tun_device == SSH_TUNID_ERR) {
333 debug("%.100s, line %lu: invalid tun device",
334 file, linenum);
335 auth_debug_add("%.100s, line %lu: invalid tun device",
336 file, linenum);
337 forced_tun_device = -1;
338 goto bad_option;
340 auth_debug_add("Forced tun device: %d", forced_tun_device);
341 opts++;
342 goto next_option;
344 next_option:
346 * Skip the comma, and move to the next option
347 * (or break out if there are no more).
349 if (!*opts)
350 fatal("Bugs in auth-options.c option processing.");
351 if (*opts == ' ' || *opts == '\t')
352 break; /* End of options. */
353 if (*opts != ',')
354 goto bad_option;
355 opts++;
356 /* Process the next option. */
359 if (!use_privsep)
360 auth_debug_send();
362 /* grant access */
363 return 1;
365 bad_option:
366 logit("Bad options in %.100s file, line %lu: %.50s",
367 file, linenum, opts);
368 auth_debug_add("Bad options in %.100s file, line %lu: %.50s",
369 file, linenum, opts);
371 if (!use_privsep)
372 auth_debug_send();
374 /* deny access */
375 return 0;