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1.3 deraadt 1: /*
2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
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".
10: */
11:
1.1 markus 12: #include "includes.h"
1.19 ! markus 13: RCSID("$OpenBSD: auth-options.c,v 1.18 2001/05/31 10:30:12 markus Exp $");
1.1 markus 14:
15: #include "packet.h"
16: #include "xmalloc.h"
17: #include "match.h"
1.11 markus 18: #include "log.h"
19: #include "canohost.h"
1.18 markus 20: #include "channels.h"
1.11 markus 21: #include "auth-options.h"
1.12 markus 22: #include "servconf.h"
1.1 markus 23:
24: /* Flags set authorized_keys flags */
25: int no_port_forwarding_flag = 0;
26: int no_agent_forwarding_flag = 0;
27: int no_x11_forwarding_flag = 0;
28: int no_pty_flag = 0;
29:
30: /* "command=" option. */
31: char *forced_command = NULL;
32:
33: /* "environment=" options. */
34: struct envstring *custom_environment = NULL;
35:
1.12 markus 36: extern ServerOptions options;
37:
1.5 markus 38: void
39: auth_clear_options(void)
40: {
41: no_agent_forwarding_flag = 0;
42: no_port_forwarding_flag = 0;
43: no_pty_flag = 0;
44: no_x11_forwarding_flag = 0;
45: while (custom_environment) {
46: struct envstring *ce = custom_environment;
47: custom_environment = ce->next;
48: xfree(ce->s);
49: xfree(ce);
50: }
51: if (forced_command) {
52: xfree(forced_command);
53: forced_command = NULL;
54: }
1.15 markus 55: channel_clear_permitted_opens();
1.5 markus 56: }
57:
1.10 markus 58: /*
59: * return 1 if access is granted, 0 if not.
60: * side effect: sets key option flags
61: */
1.1 markus 62: int
1.12 markus 63: auth_parse_options(struct passwd *pw, char *opts, char *file, u_long linenum)
1.1 markus 64: {
65: const char *cp;
1.15 markus 66: int i;
1.5 markus 67:
68: /* reset options */
69: auth_clear_options();
1.13 markus 70:
71: if (!opts)
72: return 1;
1.5 markus 73:
1.12 markus 74: while (*opts && *opts != ' ' && *opts != '\t') {
1.1 markus 75: cp = "no-port-forwarding";
1.12 markus 76: if (strncasecmp(opts, cp, strlen(cp)) == 0) {
1.1 markus 77: packet_send_debug("Port forwarding disabled.");
78: no_port_forwarding_flag = 1;
1.12 markus 79: opts += strlen(cp);
1.1 markus 80: goto next_option;
81: }
82: cp = "no-agent-forwarding";
1.12 markus 83: if (strncasecmp(opts, cp, strlen(cp)) == 0) {
1.1 markus 84: packet_send_debug("Agent forwarding disabled.");
85: no_agent_forwarding_flag = 1;
1.12 markus 86: opts += strlen(cp);
1.1 markus 87: goto next_option;
88: }
89: cp = "no-X11-forwarding";
1.12 markus 90: if (strncasecmp(opts, cp, strlen(cp)) == 0) {
1.1 markus 91: packet_send_debug("X11 forwarding disabled.");
92: no_x11_forwarding_flag = 1;
1.12 markus 93: opts += strlen(cp);
1.1 markus 94: goto next_option;
95: }
96: cp = "no-pty";
1.12 markus 97: if (strncasecmp(opts, cp, strlen(cp)) == 0) {
1.1 markus 98: packet_send_debug("Pty allocation disabled.");
99: no_pty_flag = 1;
1.12 markus 100: opts += strlen(cp);
1.1 markus 101: goto next_option;
102: }
103: cp = "command=\"";
1.12 markus 104: if (strncasecmp(opts, cp, strlen(cp)) == 0) {
105: opts += strlen(cp);
106: forced_command = xmalloc(strlen(opts) + 1);
1.1 markus 107: i = 0;
1.12 markus 108: while (*opts) {
109: if (*opts == '"')
1.1 markus 110: break;
1.12 markus 111: if (*opts == '\\' && opts[1] == '"') {
112: opts += 2;
1.1 markus 113: forced_command[i++] = '"';
114: continue;
115: }
1.12 markus 116: forced_command[i++] = *opts++;
1.1 markus 117: }
1.12 markus 118: if (!*opts) {
1.1 markus 119: debug("%.100s, line %lu: missing end quote",
1.10 markus 120: file, linenum);
1.1 markus 121: packet_send_debug("%.100s, line %lu: missing end quote",
1.10 markus 122: file, linenum);
1.14 markus 123: xfree(forced_command);
124: forced_command = NULL;
125: goto bad_option;
1.1 markus 126: }
127: forced_command[i] = 0;
128: packet_send_debug("Forced command: %.900s", forced_command);
1.12 markus 129: opts++;
1.1 markus 130: goto next_option;
131: }
132: cp = "environment=\"";
1.12 markus 133: if (strncasecmp(opts, cp, strlen(cp)) == 0) {
1.1 markus 134: char *s;
135: struct envstring *new_envstring;
1.15 markus 136:
1.12 markus 137: opts += strlen(cp);
138: s = xmalloc(strlen(opts) + 1);
1.1 markus 139: i = 0;
1.12 markus 140: while (*opts) {
141: if (*opts == '"')
1.1 markus 142: break;
1.12 markus 143: if (*opts == '\\' && opts[1] == '"') {
144: opts += 2;
1.1 markus 145: s[i++] = '"';
146: continue;
147: }
1.12 markus 148: s[i++] = *opts++;
1.1 markus 149: }
1.12 markus 150: if (!*opts) {
1.1 markus 151: debug("%.100s, line %lu: missing end quote",
1.10 markus 152: file, linenum);
1.1 markus 153: packet_send_debug("%.100s, line %lu: missing end quote",
1.10 markus 154: file, linenum);
1.14 markus 155: xfree(s);
156: goto bad_option;
1.1 markus 157: }
158: s[i] = 0;
159: packet_send_debug("Adding to environment: %.900s", s);
160: debug("Adding to environment: %.900s", s);
1.12 markus 161: opts++;
1.1 markus 162: new_envstring = xmalloc(sizeof(struct envstring));
163: new_envstring->s = s;
164: new_envstring->next = custom_environment;
165: custom_environment = new_envstring;
166: goto next_option;
167: }
168: cp = "from=\"";
1.12 markus 169: if (strncasecmp(opts, cp, strlen(cp)) == 0) {
170: const char *remote_ip = get_remote_ipaddr();
171: const char *remote_host = get_canonical_hostname(
172: options.reverse_mapping_check);
173: char *patterns = xmalloc(strlen(opts) + 1);
1.15 markus 174:
1.12 markus 175: opts += strlen(cp);
1.1 markus 176: i = 0;
1.12 markus 177: while (*opts) {
178: if (*opts == '"')
1.1 markus 179: break;
1.12 markus 180: if (*opts == '\\' && opts[1] == '"') {
181: opts += 2;
1.1 markus 182: patterns[i++] = '"';
183: continue;
184: }
1.12 markus 185: patterns[i++] = *opts++;
1.1 markus 186: }
1.12 markus 187: if (!*opts) {
1.1 markus 188: debug("%.100s, line %lu: missing end quote",
1.10 markus 189: file, linenum);
1.1 markus 190: packet_send_debug("%.100s, line %lu: missing end quote",
1.10 markus 191: file, linenum);
1.14 markus 192: xfree(patterns);
193: goto bad_option;
1.1 markus 194: }
195: patterns[i] = 0;
1.12 markus 196: opts++;
1.19 ! markus 197: if (match_host_and_ip(remote_host, remote_ip,
! 198: patterns) != 1) {
! 199: xfree(patterns);
1.12 markus 200: log("Authentication tried for %.100s with "
201: "correct key but not from a permitted "
202: "host (host=%.200s, ip=%.200s).",
203: pw->pw_name, remote_host, remote_ip);
204: packet_send_debug("Your host '%.200s' is not "
205: "permitted to use this key for login.",
206: remote_host);
1.1 markus 207: /* deny access */
208: return 0;
209: }
1.19 ! markus 210: xfree(patterns);
1.1 markus 211: /* Host name matches. */
1.15 markus 212: goto next_option;
213: }
214: cp = "permitopen=\"";
215: if (strncasecmp(opts, cp, strlen(cp)) == 0) {
216: u_short port;
217: char *c, *ep;
218: char *patterns = xmalloc(strlen(opts) + 1);
219:
220: opts += strlen(cp);
221: i = 0;
222: while (*opts) {
223: if (*opts == '"')
224: break;
225: if (*opts == '\\' && opts[1] == '"') {
226: opts += 2;
227: patterns[i++] = '"';
228: continue;
229: }
230: patterns[i++] = *opts++;
231: }
232: if (!*opts) {
233: debug("%.100s, line %lu: missing end quote",
234: file, linenum);
235: packet_send_debug("%.100s, line %lu: missing end quote",
236: file, linenum);
237: xfree(patterns);
238: goto bad_option;
239: }
240: patterns[i] = 0;
241: opts++;
242: c = strchr(patterns, ':');
243: if (c == NULL) {
244: debug("%.100s, line %lu: permitopen: missing colon <%.100s>",
245: file, linenum, patterns);
246: packet_send_debug("%.100s, line %lu: missing colon",
247: file, linenum);
248: xfree(patterns);
249: goto bad_option;
250: }
251: *c = 0;
252: c++;
253: port = strtol(c, &ep, 0);
254: if (c == ep) {
255: debug("%.100s, line %lu: permitopen: missing port <%.100s>",
256: file, linenum, patterns);
257: packet_send_debug("%.100s, line %lu: missing port",
258: file, linenum);
259: xfree(patterns);
260: goto bad_option;
261: }
1.16 markus 262: if (options.allow_tcp_forwarding)
263: channel_add_permitted_opens(patterns, port);
1.15 markus 264: xfree(patterns);
1.1 markus 265: goto next_option;
266: }
267: next_option:
268: /*
269: * Skip the comma, and move to the next option
270: * (or break out if there are no more).
271: */
1.12 markus 272: if (!*opts)
1.1 markus 273: fatal("Bugs in auth-options.c option processing.");
1.12 markus 274: if (*opts == ' ' || *opts == '\t')
1.1 markus 275: break; /* End of options. */
1.12 markus 276: if (*opts != ',')
1.1 markus 277: goto bad_option;
1.12 markus 278: opts++;
1.1 markus 279: /* Process the next option. */
280: }
281: /* grant access */
282: return 1;
283:
284: bad_option:
285: log("Bad options in %.100s file, line %lu: %.50s",
1.12 markus 286: file, linenum, opts);
1.1 markus 287: packet_send_debug("Bad options in %.100s file, line %lu: %.50s",
1.12 markus 288: file, linenum, opts);
1.1 markus 289: /* deny access */
290: return 0;
291: }