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Diffstat (limited to 'other/openssh-reverse/auth-options.c')
-rw-r--r--other/openssh-reverse/auth-options.c208
1 files changed, 208 insertions, 0 deletions
diff --git a/other/openssh-reverse/auth-options.c b/other/openssh-reverse/auth-options.c
new file mode 100644
index 0000000..55ccc85
--- /dev/null
+++ b/other/openssh-reverse/auth-options.c
@@ -0,0 +1,208 @@
1#include "includes.h"
2RCSID("$OpenBSD: auth-options.c,v 1.2 2000/06/20 01:39:38 markus Exp $");
3
4#include "ssh.h"
5#include "packet.h"
6#include "xmalloc.h"
7#include "match.h"
8
9/* Flags set authorized_keys flags */
10int no_port_forwarding_flag = 0;
11int no_agent_forwarding_flag = 0;
12int no_x11_forwarding_flag = 0;
13int no_pty_flag = 0;
14
15/* "command=" option. */
16char *forced_command = NULL;
17
18/* "environment=" options. */
19struct envstring *custom_environment = NULL;
20
21/* return 1 if access is granted, 0 if not. side effect: sets key option flags */
22int
23auth_parse_options(struct passwd *pw, char *options, unsigned long linenum)
24{
25 const char *cp;
26 if (!options)
27 return 1;
28 while (*options && *options != ' ' && *options != '\t') {
29 cp = "no-port-forwarding";
30 if (strncmp(options, cp, strlen(cp)) == 0) {
31 packet_send_debug("Port forwarding disabled.");
32 no_port_forwarding_flag = 1;
33 options += strlen(cp);
34 goto next_option;
35 }
36 cp = "no-agent-forwarding";
37 if (strncmp(options, cp, strlen(cp)) == 0) {
38 packet_send_debug("Agent forwarding disabled.");
39 no_agent_forwarding_flag = 1;
40 options += strlen(cp);
41 goto next_option;
42 }
43 cp = "no-X11-forwarding";
44 if (strncmp(options, cp, strlen(cp)) == 0) {
45 packet_send_debug("X11 forwarding disabled.");
46 no_x11_forwarding_flag = 1;
47 options += strlen(cp);
48 goto next_option;
49 }
50 cp = "no-pty";
51 if (strncmp(options, cp, strlen(cp)) == 0) {
52 packet_send_debug("Pty allocation disabled.");
53 no_pty_flag = 1;
54 options += strlen(cp);
55 goto next_option;
56 }
57 cp = "command=\"";
58 if (strncmp(options, cp, strlen(cp)) == 0) {
59 int i;
60 options += strlen(cp);
61 forced_command = xmalloc(strlen(options) + 1);
62 i = 0;
63 while (*options) {
64 if (*options == '"')
65 break;
66 if (*options == '\\' && options[1] == '"') {
67 options += 2;
68 forced_command[i++] = '"';
69 continue;
70 }
71 forced_command[i++] = *options++;
72 }
73 if (!*options) {
74 debug("%.100s, line %lu: missing end quote",
75 SSH_USER_PERMITTED_KEYS, linenum);
76 packet_send_debug("%.100s, line %lu: missing end quote",
77 SSH_USER_PERMITTED_KEYS, linenum);
78 continue;
79 }
80 forced_command[i] = 0;
81 packet_send_debug("Forced command: %.900s", forced_command);
82 options++;
83 goto next_option;
84 }
85 cp = "environment=\"";
86 if (strncmp(options, cp, strlen(cp)) == 0) {
87 int i;
88 char *s;
89 struct envstring *new_envstring;
90 options += strlen(cp);
91 s = xmalloc(strlen(options) + 1);
92 i = 0;
93 while (*options) {
94 if (*options == '"')
95 break;
96 if (*options == '\\' && options[1] == '"') {
97 options += 2;
98 s[i++] = '"';
99 continue;
100 }
101 s[i++] = *options++;
102 }
103 if (!*options) {
104 debug("%.100s, line %lu: missing end quote",
105 SSH_USER_PERMITTED_KEYS, linenum);
106 packet_send_debug("%.100s, line %lu: missing end quote",
107 SSH_USER_PERMITTED_KEYS, linenum);
108 continue;
109 }
110 s[i] = 0;
111 packet_send_debug("Adding to environment: %.900s", s);
112 debug("Adding to environment: %.900s", s);
113 options++;
114 new_envstring = xmalloc(sizeof(struct envstring));
115 new_envstring->s = s;
116 new_envstring->next = custom_environment;
117 custom_environment = new_envstring;
118 goto next_option;
119 }
120 cp = "from=\"";
121 if (strncmp(options, cp, strlen(cp)) == 0) {
122 int mname, mip;
123 char *patterns = xmalloc(strlen(options) + 1);
124 int i;
125 options += strlen(cp);
126 i = 0;
127 while (*options) {
128 if (*options == '"')
129 break;
130 if (*options == '\\' && options[1] == '"') {
131 options += 2;
132 patterns[i++] = '"';
133 continue;
134 }
135 patterns[i++] = *options++;
136 }
137 if (!*options) {
138 debug("%.100s, line %lu: missing end quote",
139 SSH_USER_PERMITTED_KEYS, linenum);
140 packet_send_debug("%.100s, line %lu: missing end quote",
141 SSH_USER_PERMITTED_KEYS, linenum);
142 continue;
143 }
144 patterns[i] = 0;
145 options++;
146 /*
147 * Deny access if we get a negative
148 * match for the hostname or the ip
149 * or if we get not match at all
150 */
151 mname = match_hostname(get_canonical_hostname(),
152 patterns, strlen(patterns));
153 mip = match_hostname(get_remote_ipaddr(),
154 patterns, strlen(patterns));
155 xfree(patterns);
156 if (mname == -1 || mip == -1 ||
157 (mname != 1 && mip != 1)) {
158 log("Authentication tried for %.100s with correct key but not from a permitted host (host=%.200s, ip=%.200s).",
159 pw->pw_name, get_canonical_hostname(),
160 get_remote_ipaddr());
161 packet_send_debug("Your host '%.200s' is not permitted to use this key for login.",
162 get_canonical_hostname());
163 /* key invalid for this host, reset flags */
164 no_agent_forwarding_flag = 0;
165 no_port_forwarding_flag = 0;
166 no_pty_flag = 0;
167 no_x11_forwarding_flag = 0;
168 while (custom_environment) {
169 struct envstring *ce = custom_environment;
170 custom_environment = ce->next;
171 xfree(ce->s);
172 xfree(ce);
173 }
174 if (forced_command) {
175 xfree(forced_command);
176 forced_command = NULL;
177 }
178 /* deny access */
179 return 0;
180 }
181 /* Host name matches. */
182 goto next_option;
183 }
184next_option:
185 /*
186 * Skip the comma, and move to the next option
187 * (or break out if there are no more).
188 */
189 if (!*options)
190 fatal("Bugs in auth-options.c option processing.");
191 if (*options == ' ' || *options == '\t')
192 break; /* End of options. */
193 if (*options != ',')
194 goto bad_option;
195 options++;
196 /* Process the next option. */
197 }
198 /* grant access */
199 return 1;
200
201bad_option:
202 log("Bad options in %.100s file, line %lu: %.50s",
203 SSH_USER_PERMITTED_KEYS, linenum, options);
204 packet_send_debug("Bad options in %.100s file, line %lu: %.50s",
205 SSH_USER_PERMITTED_KEYS, linenum, options);
206 /* deny access */
207 return 0;
208}