Annotation of src/usr.bin/ssh/auth-options.c, Revision 1.22
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"
1.22 ! provos 13: RCSID("$OpenBSD: auth-options.c,v 1.21 2002/01/29 14:32:03 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"
1.22 ! provos 23: #include "bufaux.h"
1.20 stevesk 24: #include "misc.h"
1.22 ! provos 25: #include "monitor_wrap.h"
! 26:
! 27: /* Debugging messages */
! 28: Buffer auth_debug;
! 29: int auth_debug_init;
1.1 markus 30:
31: /* Flags set authorized_keys flags */
32: int no_port_forwarding_flag = 0;
33: int no_agent_forwarding_flag = 0;
34: int no_x11_forwarding_flag = 0;
35: int no_pty_flag = 0;
36:
37: /* "command=" option. */
38: char *forced_command = NULL;
39:
40: /* "environment=" options. */
41: struct envstring *custom_environment = NULL;
42:
1.12 markus 43: extern ServerOptions options;
44:
1.5 markus 45: void
1.22 ! provos 46: auth_send_debug(Buffer *m)
! 47: {
! 48: char *msg;
! 49:
! 50: while (buffer_len(m)) {
! 51: msg = buffer_get_string(m, NULL);
! 52: packet_send_debug("%s", msg);
! 53: xfree(msg);
! 54: }
! 55: }
! 56:
! 57: void
1.5 markus 58: auth_clear_options(void)
59: {
1.22 ! provos 60: if (auth_debug_init)
! 61: buffer_clear(&auth_debug);
! 62: else {
! 63: buffer_init(&auth_debug);
! 64: auth_debug_init = 1;
! 65: }
! 66:
1.5 markus 67: no_agent_forwarding_flag = 0;
68: no_port_forwarding_flag = 0;
69: no_pty_flag = 0;
70: no_x11_forwarding_flag = 0;
71: while (custom_environment) {
72: struct envstring *ce = custom_environment;
73: custom_environment = ce->next;
74: xfree(ce->s);
75: xfree(ce);
76: }
77: if (forced_command) {
78: xfree(forced_command);
79: forced_command = NULL;
80: }
1.15 markus 81: channel_clear_permitted_opens();
1.5 markus 82: }
83:
1.10 markus 84: /*
85: * return 1 if access is granted, 0 if not.
86: * side effect: sets key option flags
87: */
1.1 markus 88: int
1.12 markus 89: auth_parse_options(struct passwd *pw, char *opts, char *file, u_long linenum)
1.1 markus 90: {
1.22 ! provos 91: char tmp[1024];
1.1 markus 92: const char *cp;
1.15 markus 93: int i;
1.5 markus 94:
95: /* reset options */
96: auth_clear_options();
1.13 markus 97:
98: if (!opts)
99: return 1;
1.5 markus 100:
1.12 markus 101: while (*opts && *opts != ' ' && *opts != '\t') {
1.1 markus 102: cp = "no-port-forwarding";
1.12 markus 103: if (strncasecmp(opts, cp, strlen(cp)) == 0) {
1.22 ! provos 104: snprintf(tmp, sizeof(tmp), "Port forwarding disabled.");
! 105: buffer_put_cstring(&auth_debug, tmp);
1.1 markus 106: no_port_forwarding_flag = 1;
1.12 markus 107: opts += strlen(cp);
1.1 markus 108: goto next_option;
109: }
110: cp = "no-agent-forwarding";
1.12 markus 111: if (strncasecmp(opts, cp, strlen(cp)) == 0) {
1.22 ! provos 112: snprintf(tmp, sizeof(tmp), "Agent forwarding disabled.");
! 113: buffer_put_cstring(&auth_debug, tmp);
1.1 markus 114: no_agent_forwarding_flag = 1;
1.12 markus 115: opts += strlen(cp);
1.1 markus 116: goto next_option;
117: }
118: cp = "no-X11-forwarding";
1.12 markus 119: if (strncasecmp(opts, cp, strlen(cp)) == 0) {
1.22 ! provos 120: snprintf(tmp, sizeof(tmp), "X11 forwarding disabled.");
! 121: buffer_put_cstring(&auth_debug, tmp);
1.1 markus 122: no_x11_forwarding_flag = 1;
1.12 markus 123: opts += strlen(cp);
1.1 markus 124: goto next_option;
125: }
126: cp = "no-pty";
1.12 markus 127: if (strncasecmp(opts, cp, strlen(cp)) == 0) {
1.22 ! provos 128: snprintf(tmp, sizeof(tmp), "Pty allocation disabled.");
! 129: buffer_put_cstring(&auth_debug, tmp);
1.1 markus 130: no_pty_flag = 1;
1.12 markus 131: opts += strlen(cp);
1.1 markus 132: goto next_option;
133: }
134: cp = "command=\"";
1.12 markus 135: if (strncasecmp(opts, cp, strlen(cp)) == 0) {
136: opts += strlen(cp);
137: forced_command = xmalloc(strlen(opts) + 1);
1.1 markus 138: i = 0;
1.12 markus 139: while (*opts) {
140: if (*opts == '"')
1.1 markus 141: break;
1.12 markus 142: if (*opts == '\\' && opts[1] == '"') {
143: opts += 2;
1.1 markus 144: forced_command[i++] = '"';
145: continue;
146: }
1.12 markus 147: forced_command[i++] = *opts++;
1.1 markus 148: }
1.12 markus 149: if (!*opts) {
1.1 markus 150: debug("%.100s, line %lu: missing end quote",
1.10 markus 151: file, linenum);
1.22 ! provos 152: snprintf(tmp, sizeof(tmp), "%.100s, line %lu: missing end quote",
1.10 markus 153: file, linenum);
1.22 ! provos 154: buffer_put_cstring(&auth_debug, tmp);
1.14 markus 155: xfree(forced_command);
156: forced_command = NULL;
157: goto bad_option;
1.1 markus 158: }
159: forced_command[i] = 0;
1.22 ! provos 160: snprintf(tmp, sizeof(tmp), "Forced command: %.900s", forced_command);
! 161: buffer_put_cstring(&auth_debug, tmp);
1.12 markus 162: opts++;
1.1 markus 163: goto next_option;
164: }
165: cp = "environment=\"";
1.12 markus 166: if (strncasecmp(opts, cp, strlen(cp)) == 0) {
1.1 markus 167: char *s;
168: struct envstring *new_envstring;
1.15 markus 169:
1.12 markus 170: opts += strlen(cp);
171: s = xmalloc(strlen(opts) + 1);
1.1 markus 172: i = 0;
1.12 markus 173: while (*opts) {
174: if (*opts == '"')
1.1 markus 175: break;
1.12 markus 176: if (*opts == '\\' && opts[1] == '"') {
177: opts += 2;
1.1 markus 178: s[i++] = '"';
179: continue;
180: }
1.12 markus 181: s[i++] = *opts++;
1.1 markus 182: }
1.12 markus 183: if (!*opts) {
1.1 markus 184: debug("%.100s, line %lu: missing end quote",
1.10 markus 185: file, linenum);
1.22 ! provos 186: snprintf(tmp, sizeof(tmp), "%.100s, line %lu: missing end quote",
1.10 markus 187: file, linenum);
1.22 ! provos 188: buffer_put_cstring(&auth_debug, tmp);
1.14 markus 189: xfree(s);
190: goto bad_option;
1.1 markus 191: }
192: s[i] = 0;
1.22 ! provos 193: snprintf(tmp, sizeof(tmp), "Adding to environment: %.900s", s);
! 194: buffer_put_cstring(&auth_debug, tmp);
1.1 markus 195: debug("Adding to environment: %.900s", s);
1.12 markus 196: opts++;
1.1 markus 197: new_envstring = xmalloc(sizeof(struct envstring));
198: new_envstring->s = s;
199: new_envstring->next = custom_environment;
200: custom_environment = new_envstring;
201: goto next_option;
202: }
203: cp = "from=\"";
1.12 markus 204: if (strncasecmp(opts, cp, strlen(cp)) == 0) {
205: const char *remote_ip = get_remote_ipaddr();
206: const char *remote_host = get_canonical_hostname(
1.21 markus 207: options.verify_reverse_mapping);
1.12 markus 208: char *patterns = xmalloc(strlen(opts) + 1);
1.15 markus 209:
1.12 markus 210: opts += strlen(cp);
1.1 markus 211: i = 0;
1.12 markus 212: while (*opts) {
213: if (*opts == '"')
1.1 markus 214: break;
1.12 markus 215: if (*opts == '\\' && opts[1] == '"') {
216: opts += 2;
1.1 markus 217: patterns[i++] = '"';
218: continue;
219: }
1.12 markus 220: patterns[i++] = *opts++;
1.1 markus 221: }
1.12 markus 222: if (!*opts) {
1.1 markus 223: debug("%.100s, line %lu: missing end quote",
1.10 markus 224: file, linenum);
1.22 ! provos 225: snprintf(tmp, sizeof(tmp), "%.100s, line %lu: missing end quote",
1.10 markus 226: file, linenum);
1.22 ! provos 227: buffer_put_cstring(&auth_debug, tmp);
1.14 markus 228: xfree(patterns);
229: goto bad_option;
1.1 markus 230: }
231: patterns[i] = 0;
1.12 markus 232: opts++;
1.19 markus 233: if (match_host_and_ip(remote_host, remote_ip,
234: patterns) != 1) {
235: xfree(patterns);
1.12 markus 236: log("Authentication tried for %.100s with "
237: "correct key but not from a permitted "
238: "host (host=%.200s, ip=%.200s).",
239: pw->pw_name, remote_host, remote_ip);
1.22 ! provos 240: snprintf(tmp, sizeof(tmp),
! 241: "Your host '%.200s' is not "
1.12 markus 242: "permitted to use this key for login.",
243: remote_host);
1.22 ! provos 244: buffer_put_cstring(&auth_debug, tmp);
1.1 markus 245: /* deny access */
246: return 0;
247: }
1.19 markus 248: xfree(patterns);
1.1 markus 249: /* Host name matches. */
1.15 markus 250: goto next_option;
251: }
252: cp = "permitopen=\"";
253: if (strncasecmp(opts, cp, strlen(cp)) == 0) {
1.20 stevesk 254: char host[256], sport[6];
1.15 markus 255: u_short port;
256: char *patterns = xmalloc(strlen(opts) + 1);
257:
258: opts += strlen(cp);
259: i = 0;
260: while (*opts) {
261: if (*opts == '"')
262: break;
263: if (*opts == '\\' && opts[1] == '"') {
264: opts += 2;
265: patterns[i++] = '"';
266: continue;
267: }
268: patterns[i++] = *opts++;
269: }
270: if (!*opts) {
271: debug("%.100s, line %lu: missing end quote",
272: file, linenum);
1.22 ! provos 273: snprintf(tmp, sizeof(tmp), "%.100s, line %lu: missing end quote",
1.15 markus 274: file, linenum);
1.22 ! provos 275: buffer_put_cstring(&auth_debug, tmp);
1.15 markus 276: xfree(patterns);
277: goto bad_option;
278: }
279: patterns[i] = 0;
280: opts++;
1.20 stevesk 281: if (sscanf(patterns, "%255[^:]:%5[0-9]", host, sport) != 2 &&
282: sscanf(patterns, "%255[^/]/%5[0-9]", host, sport) != 2) {
283: debug("%.100s, line %lu: Bad permitopen specification "
284: "<%.100s>", file, linenum, patterns);
1.22 ! provos 285: snprintf(tmp, sizeof(tmp), "%.100s, line %lu: "
1.20 stevesk 286: "Bad permitopen specification", file, linenum);
1.22 ! provos 287: buffer_put_cstring(&auth_debug, tmp);
1.15 markus 288: xfree(patterns);
289: goto bad_option;
290: }
1.20 stevesk 291: if ((port = a2port(sport)) == 0) {
292: debug("%.100s, line %lu: Bad permitopen port <%.100s>",
293: file, linenum, sport);
1.22 ! provos 294: snprintf(tmp, sizeof(tmp), "%.100s, line %lu: "
1.20 stevesk 295: "Bad permitopen port", file, linenum);
1.22 ! provos 296: buffer_put_cstring(&auth_debug, tmp);
1.15 markus 297: xfree(patterns);
298: goto bad_option;
299: }
1.16 markus 300: if (options.allow_tcp_forwarding)
1.20 stevesk 301: channel_add_permitted_opens(host, port);
1.15 markus 302: xfree(patterns);
1.1 markus 303: goto next_option;
304: }
305: next_option:
306: /*
307: * Skip the comma, and move to the next option
308: * (or break out if there are no more).
309: */
1.12 markus 310: if (!*opts)
1.1 markus 311: fatal("Bugs in auth-options.c option processing.");
1.12 markus 312: if (*opts == ' ' || *opts == '\t')
1.1 markus 313: break; /* End of options. */
1.12 markus 314: if (*opts != ',')
1.1 markus 315: goto bad_option;
1.12 markus 316: opts++;
1.1 markus 317: /* Process the next option. */
318: }
1.22 ! provos 319:
! 320: if (!use_privsep)
! 321: auth_send_debug(&auth_debug);
! 322:
1.1 markus 323: /* grant access */
324: return 1;
325:
326: bad_option:
327: log("Bad options in %.100s file, line %lu: %.50s",
1.12 markus 328: file, linenum, opts);
1.22 ! provos 329: snprintf(tmp, sizeof(tmp),
! 330: "Bad options in %.100s file, line %lu: %.50s",
1.12 markus 331: file, linenum, opts);
1.22 ! provos 332: buffer_put_cstring(&auth_debug, tmp);
! 333:
! 334: if (!use_privsep)
! 335: auth_send_debug(&auth_debug);
! 336:
1.1 markus 337: /* deny access */
338: return 0;
339: }
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