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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"
1.10 ! markus 13: RCSID("$OpenBSD: auth-options.c,v 1.9 2001/01/19 15:55:10 markus Exp $");
1.1 markus 14:
15: #include "ssh.h"
16: #include "packet.h"
17: #include "xmalloc.h"
18: #include "match.h"
19:
20: /* Flags set authorized_keys flags */
21: int no_port_forwarding_flag = 0;
22: int no_agent_forwarding_flag = 0;
23: int no_x11_forwarding_flag = 0;
24: int no_pty_flag = 0;
25:
26: /* "command=" option. */
27: char *forced_command = NULL;
28:
29: /* "environment=" options. */
30: struct envstring *custom_environment = NULL;
31:
1.5 markus 32: void
33: auth_clear_options(void)
34: {
35: no_agent_forwarding_flag = 0;
36: no_port_forwarding_flag = 0;
37: no_pty_flag = 0;
38: no_x11_forwarding_flag = 0;
39: while (custom_environment) {
40: struct envstring *ce = custom_environment;
41: custom_environment = ce->next;
42: xfree(ce->s);
43: xfree(ce);
44: }
45: if (forced_command) {
46: xfree(forced_command);
47: forced_command = NULL;
48: }
49: }
50:
1.10 ! markus 51: /*
! 52: * return 1 if access is granted, 0 if not.
! 53: * side effect: sets key option flags
! 54: */
1.1 markus 55: int
1.10 ! markus 56: auth_parse_options(struct passwd *pw, char *options, char *file, u_long linenum)
1.1 markus 57: {
58: const char *cp;
59: if (!options)
60: return 1;
1.5 markus 61:
62: /* reset options */
63: auth_clear_options();
64:
1.1 markus 65: while (*options && *options != ' ' && *options != '\t') {
66: cp = "no-port-forwarding";
1.6 markus 67: if (strncasecmp(options, cp, strlen(cp)) == 0) {
1.1 markus 68: packet_send_debug("Port forwarding disabled.");
69: no_port_forwarding_flag = 1;
70: options += strlen(cp);
71: goto next_option;
72: }
73: cp = "no-agent-forwarding";
1.6 markus 74: if (strncasecmp(options, cp, strlen(cp)) == 0) {
1.1 markus 75: packet_send_debug("Agent forwarding disabled.");
76: no_agent_forwarding_flag = 1;
77: options += strlen(cp);
78: goto next_option;
79: }
80: cp = "no-X11-forwarding";
1.6 markus 81: if (strncasecmp(options, cp, strlen(cp)) == 0) {
1.1 markus 82: packet_send_debug("X11 forwarding disabled.");
83: no_x11_forwarding_flag = 1;
84: options += strlen(cp);
85: goto next_option;
86: }
87: cp = "no-pty";
1.6 markus 88: if (strncasecmp(options, cp, strlen(cp)) == 0) {
1.1 markus 89: packet_send_debug("Pty allocation disabled.");
90: no_pty_flag = 1;
91: options += strlen(cp);
92: goto next_option;
93: }
94: cp = "command=\"";
1.6 markus 95: if (strncasecmp(options, cp, strlen(cp)) == 0) {
1.1 markus 96: int i;
97: options += strlen(cp);
98: forced_command = xmalloc(strlen(options) + 1);
99: i = 0;
100: while (*options) {
101: if (*options == '"')
102: break;
103: if (*options == '\\' && options[1] == '"') {
104: options += 2;
105: forced_command[i++] = '"';
106: continue;
107: }
108: forced_command[i++] = *options++;
109: }
110: if (!*options) {
111: debug("%.100s, line %lu: missing end quote",
1.10 ! markus 112: file, linenum);
1.1 markus 113: packet_send_debug("%.100s, line %lu: missing end quote",
1.10 ! markus 114: file, linenum);
1.1 markus 115: continue;
116: }
117: forced_command[i] = 0;
118: packet_send_debug("Forced command: %.900s", forced_command);
119: options++;
120: goto next_option;
121: }
122: cp = "environment=\"";
1.6 markus 123: if (strncasecmp(options, cp, strlen(cp)) == 0) {
1.1 markus 124: int i;
125: char *s;
126: struct envstring *new_envstring;
127: options += strlen(cp);
128: s = xmalloc(strlen(options) + 1);
129: i = 0;
130: while (*options) {
131: if (*options == '"')
132: break;
133: if (*options == '\\' && options[1] == '"') {
134: options += 2;
135: s[i++] = '"';
136: continue;
137: }
138: s[i++] = *options++;
139: }
140: if (!*options) {
141: debug("%.100s, line %lu: missing end quote",
1.10 ! markus 142: file, linenum);
1.1 markus 143: packet_send_debug("%.100s, line %lu: missing end quote",
1.10 ! markus 144: file, linenum);
1.1 markus 145: continue;
146: }
147: s[i] = 0;
148: packet_send_debug("Adding to environment: %.900s", s);
149: debug("Adding to environment: %.900s", s);
150: options++;
151: new_envstring = xmalloc(sizeof(struct envstring));
152: new_envstring->s = s;
153: new_envstring->next = custom_environment;
154: custom_environment = new_envstring;
155: goto next_option;
156: }
157: cp = "from=\"";
1.6 markus 158: if (strncasecmp(options, cp, strlen(cp)) == 0) {
1.1 markus 159: int mname, mip;
160: char *patterns = xmalloc(strlen(options) + 1);
161: int i;
162: options += strlen(cp);
163: i = 0;
164: while (*options) {
165: if (*options == '"')
166: break;
167: if (*options == '\\' && options[1] == '"') {
168: options += 2;
169: patterns[i++] = '"';
170: continue;
171: }
172: patterns[i++] = *options++;
173: }
174: if (!*options) {
175: debug("%.100s, line %lu: missing end quote",
1.10 ! markus 176: file, linenum);
1.1 markus 177: packet_send_debug("%.100s, line %lu: missing end quote",
1.10 ! markus 178: file, linenum);
1.1 markus 179: continue;
180: }
181: patterns[i] = 0;
182: options++;
183: /*
184: * Deny access if we get a negative
185: * match for the hostname or the ip
186: * or if we get not match at all
187: */
188: mname = match_hostname(get_canonical_hostname(),
189: patterns, strlen(patterns));
190: mip = match_hostname(get_remote_ipaddr(),
191: patterns, strlen(patterns));
192: xfree(patterns);
193: if (mname == -1 || mip == -1 ||
194: (mname != 1 && mip != 1)) {
195: log("Authentication tried for %.100s with correct key but not from a permitted host (host=%.200s, ip=%.200s).",
196: pw->pw_name, get_canonical_hostname(),
197: get_remote_ipaddr());
198: packet_send_debug("Your host '%.200s' is not permitted to use this key for login.",
199: get_canonical_hostname());
200: /* deny access */
201: return 0;
202: }
203: /* Host name matches. */
204: goto next_option;
205: }
206: next_option:
207: /*
208: * Skip the comma, and move to the next option
209: * (or break out if there are no more).
210: */
211: if (!*options)
212: fatal("Bugs in auth-options.c option processing.");
213: if (*options == ' ' || *options == '\t')
214: break; /* End of options. */
215: if (*options != ',')
216: goto bad_option;
217: options++;
218: /* Process the next option. */
219: }
220: /* grant access */
221: return 1;
222:
223: bad_option:
224: log("Bad options in %.100s file, line %lu: %.50s",
1.10 ! markus 225: file, linenum, options);
1.1 markus 226: packet_send_debug("Bad options in %.100s file, line %lu: %.50s",
1.10 ! markus 227: file, linenum, options);
1.1 markus 228: /* deny access */
229: return 0;
230: }