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1 | /* | |
2 | * Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * 1. Redistributions of source code must retain the above copyright | |
8 | * notice, this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright | |
10 | * notice, this list of conditions and the following disclaimer in the | |
11 | * documentation and/or other materials provided with the distribution. | |
12 | * | |
13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
23 | */ | |
24 | ||
25 | #include "includes.h" | |
26 | ||
27 | #ifdef GSSAPI | |
28 | #ifdef GSI | |
29 | ||
30 | #include <sys/types.h> | |
31 | ||
32 | #include <stdarg.h> | |
33 | #include <string.h> | |
34 | ||
35 | #include "xmalloc.h" | |
36 | #include "key.h" | |
37 | #include "hostfile.h" | |
38 | #include "auth.h" | |
39 | #include "log.h" | |
40 | #include "servconf.h" | |
41 | ||
42 | #include "buffer.h" | |
43 | #include "ssh-gss.h" | |
44 | ||
45 | extern ServerOptions options; | |
46 | ||
47 | #include <globus_gss_assist.h> | |
48 | ||
49 | static int ssh_gssapi_gsi_userok(ssh_gssapi_client *client, char *name); | |
50 | static int ssh_gssapi_gsi_localname(ssh_gssapi_client *client, char **user); | |
51 | static void ssh_gssapi_gsi_storecreds(ssh_gssapi_client *client); | |
52 | static void ssh_gssapi_gsi_updatecreds(ssh_gssapi_ccache *store, | |
53 | ssh_gssapi_client *client); | |
54 | ||
55 | ssh_gssapi_mech gssapi_gsi_mech = { | |
56 | "dZuIebMjgUqaxvbF7hDbAw==", | |
57 | "GSI", | |
58 | {9, "\x2B\x06\x01\x04\x01\x9B\x50\x01\x01"}, | |
59 | NULL, | |
60 | &ssh_gssapi_gsi_userok, | |
61 | &ssh_gssapi_gsi_localname, | |
62 | &ssh_gssapi_gsi_storecreds, | |
63 | &ssh_gssapi_gsi_updatecreds | |
64 | }; | |
65 | ||
66 | /* | |
67 | * Check if this user is OK to login under GSI. User has been authenticated | |
68 | * as identity in global 'client_name.value' and is trying to log in as passed | |
69 | * username in 'name'. | |
70 | * | |
71 | * Returns non-zero if user is authorized, 0 otherwise. | |
72 | */ | |
73 | static int | |
74 | ssh_gssapi_gsi_userok(ssh_gssapi_client *client, char *name) | |
75 | { | |
76 | int authorized = 0; | |
77 | globus_result_t res; | |
78 | #ifdef HAVE_GLOBUS_GSS_ASSIST_MAP_AND_AUTHORIZE | |
79 | char lname[256] = ""; | |
80 | #endif | |
81 | ||
82 | #ifdef GLOBUS_GSI_GSS_ASSIST_MODULE | |
83 | if (globus_module_activate(GLOBUS_GSI_GSS_ASSIST_MODULE) != 0) { | |
84 | return 0; | |
85 | } | |
86 | #endif | |
87 | ||
88 | /* use new globus_gss_assist_map_and_authorize() interface if available */ | |
89 | #ifdef HAVE_GLOBUS_GSS_ASSIST_MAP_AND_AUTHORIZE | |
90 | debug("calling globus_gss_assist_map_and_authorize()"); | |
91 | if (GLOBUS_SUCCESS != | |
92 | (res = globus_gss_assist_map_and_authorize(client->context, "ssh", | |
93 | name, lname, 256))) { | |
94 | debug("%s", globus_error_print_chain(globus_error_get(res))); | |
95 | } else if (lname && lname[0] && strcmp(name, lname) != 0) { | |
96 | debug("GSI user maps to %s, not %s", lname, name); | |
97 | } else { | |
98 | authorized = 1; | |
99 | } | |
100 | #else | |
101 | debug("calling globus_gss_assist_userok()"); | |
102 | if (GLOBUS_SUCCESS != | |
103 | (res = (globus_gss_assist_userok(client->displayname.value, | |
104 | name)))) { | |
105 | debug("%s", globus_error_print_chain(globus_error_get(res))); | |
106 | } else { | |
107 | authorized = 1; | |
108 | } | |
109 | #endif | |
110 | ||
111 | logit("GSI user %s is%s authorized as target user %s", | |
112 | (char *) client->displayname.value, (authorized ? "" : " not"), name); | |
113 | ||
114 | return authorized; | |
115 | } | |
116 | ||
117 | /* | |
118 | * Return the local username associated with the GSI credentials. | |
119 | */ | |
120 | int | |
121 | ssh_gssapi_gsi_localname(ssh_gssapi_client *client, char **user) | |
122 | { | |
123 | globus_result_t res; | |
124 | #ifdef HAVE_GLOBUS_GSS_ASSIST_MAP_AND_AUTHORIZE | |
125 | char lname[256] = ""; | |
126 | #endif | |
127 | ||
128 | #ifdef GLOBUS_GSI_GSS_ASSIST_MODULE | |
129 | if (globus_module_activate(GLOBUS_GSI_GSS_ASSIST_MODULE) != 0) { | |
130 | return 0; | |
131 | } | |
132 | #endif | |
133 | ||
134 | /* use new globus_gss_assist_map_and_authorize() interface if available */ | |
135 | #ifdef HAVE_GLOBUS_GSS_ASSIST_MAP_AND_AUTHORIZE | |
136 | debug("calling globus_gss_assist_map_and_authorize()"); | |
137 | if (GLOBUS_SUCCESS != | |
138 | (res = globus_gss_assist_map_and_authorize(client->context, "ssh", | |
139 | NULL, lname, 256))) { | |
140 | debug("%s", globus_error_print_chain(globus_error_get(res))); | |
141 | logit("failed to map GSI user %s", (char *)client->displayname.value); | |
142 | return 0; | |
143 | } | |
144 | *user = strdup(lname); | |
145 | #else | |
146 | debug("calling globus_gss_assist_gridmap()"); | |
147 | if (GLOBUS_SUCCESS != | |
148 | (res = globus_gss_assist_gridmap(client->displayname.value, user))) { | |
149 | debug("%s", globus_error_print_chain(globus_error_get(res))); | |
150 | logit("failed to map GSI user %s", (char *)client->displayname.value); | |
151 | return 0; | |
152 | } | |
153 | #endif | |
154 | ||
155 | logit("GSI user %s mapped to target user %s", | |
156 | (char *) client->displayname.value, *user); | |
157 | ||
158 | return 1; | |
159 | } | |
160 | ||
161 | /* | |
162 | * Export GSI credentials to disk. | |
163 | */ | |
164 | static void | |
165 | ssh_gssapi_gsi_storecreds(ssh_gssapi_client *client) | |
166 | { | |
167 | OM_uint32 major_status; | |
168 | OM_uint32 minor_status; | |
169 | gss_buffer_desc export_cred = GSS_C_EMPTY_BUFFER; | |
170 | char * p; | |
171 | ||
172 | if (!client || !client->creds) { | |
173 | return; | |
174 | } | |
175 | ||
176 | major_status = gss_export_cred(&minor_status, | |
177 | client->creds, | |
178 | GSS_C_NO_OID, | |
179 | 1, | |
180 | &export_cred); | |
181 | if (GSS_ERROR(major_status) && major_status != GSS_S_UNAVAILABLE) { | |
182 | Gssctxt *ctx; | |
183 | ssh_gssapi_build_ctx(&ctx); | |
184 | ctx->major = major_status; | |
185 | ctx->minor = minor_status; | |
186 | ssh_gssapi_set_oid(ctx, &gssapi_gsi_mech.oid); | |
187 | ssh_gssapi_error(ctx); | |
188 | ssh_gssapi_delete_ctx(&ctx); | |
189 | return; | |
190 | } | |
191 | ||
192 | p = strchr((char *) export_cred.value, '='); | |
193 | if (p == NULL) { | |
194 | logit("Failed to parse exported credentials string '%.100s'", | |
195 | (char *)export_cred.value); | |
196 | gss_release_buffer(&minor_status, &export_cred); | |
197 | return; | |
198 | } | |
199 | *p++ = '\0'; | |
200 | if (strcmp((char *)export_cred.value,"X509_USER_DELEG_PROXY") == 0) { | |
201 | client->store.envvar = strdup("X509_USER_PROXY"); | |
202 | } else { | |
203 | client->store.envvar = strdup((char *)export_cred.value); | |
204 | } | |
205 | if (access(p, R_OK) == 0) { | |
206 | if (client->store.filename) { | |
207 | if (rename(p, client->store.filename) < 0) { | |
208 | logit("Failed to rename %s to %s: %s", p, | |
209 | client->store.filename, strerror(errno)); | |
210 | xfree(client->store.filename); | |
211 | client->store.filename = strdup(p); | |
212 | } else { | |
213 | p = client->store.filename; | |
214 | } | |
215 | } else { | |
216 | client->store.filename = strdup(p); | |
217 | } | |
218 | } | |
219 | client->store.envval = strdup(p); | |
220 | #ifdef USE_PAM | |
221 | if (options.use_pam) | |
222 | do_pam_putenv(client->store.envvar, client->store.envval); | |
223 | #endif | |
224 | gss_release_buffer(&minor_status, &export_cred); | |
225 | } | |
226 | ||
227 | /* | |
228 | * Export updated GSI credentials to disk. | |
229 | */ | |
230 | static int | |
231 | ssh_gssapi_gsi_updatecreds(ssh_gssapi_ccache *store,ssh_gssapi_client *client) | |
232 | { | |
233 | ssh_gssapi_gsi_storecreds(client); | |
234 | return 1; | |
235 | } | |
236 | ||
237 | #endif /* GSI */ | |
238 | #endif /* GSSAPI */ |