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f4b9ce42 | 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 | ||
30460aeb | 30 | #include <sys/types.h> |
31 | ||
32 | #include <stdarg.h> | |
33 | #include <string.h> | |
34 | ||
f4b9ce42 | 35 | #include "xmalloc.h" |
30460aeb | 36 | #include "key.h" |
37 | #include "hostfile.h" | |
38 | #include "auth.h" | |
f4b9ce42 | 39 | #include "log.h" |
40 | #include "servconf.h" | |
41 | ||
30460aeb | 42 | #include "buffer.h" |
f4b9ce42 | 43 | #include "ssh-gss.h" |
44 | ||
3b7a7049 | 45 | extern ServerOptions options; |
46 | ||
f4b9ce42 | 47 | #include <globus_gss_assist.h> |
48 | ||
0ef028e1 | 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); | |
55beaf4d | 52 | static int ssh_gssapi_gsi_updatecreds(ssh_gssapi_ccache *store, |
da624706 | 53 | ssh_gssapi_client *client); |
0ef028e1 | 54 | |
0ef028e1 | 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, | |
c7931c9a | 62 | &ssh_gssapi_gsi_storecreds, |
da624706 | 63 | &ssh_gssapi_gsi_updatecreds |
0ef028e1 | 64 | }; |
65 | ||
f4b9ce42 | 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; | |
87c01c94 | 77 | globus_result_t res; |
78 | #ifdef HAVE_GLOBUS_GSS_ASSIST_MAP_AND_AUTHORIZE | |
79 | char lname[256] = ""; | |
80 | #endif | |
f4b9ce42 | 81 | |
0ef028e1 | 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 | ||
87c01c94 | 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))); | |
f9492369 | 95 | } else if (lname && lname[0] && strcmp(name, lname) != 0) { |
87c01c94 | 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 | |
f4b9ce42 | 110 | |
7cac2b65 | 111 | logit("GSI user %s is%s authorized as target user %s", |
112 | (char *) client->displayname.value, (authorized ? "" : " not"), name); | |
f4b9ce42 | 113 | |
114 | return authorized; | |
115 | } | |
116 | ||
117 | /* | |
0ef028e1 | 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 | { | |
87c01c94 | 123 | globus_result_t res; |
124 | #ifdef HAVE_GLOBUS_GSS_ASSIST_MAP_AND_AUTHORIZE | |
125 | char lname[256] = ""; | |
126 | #endif | |
127 | ||
0ef028e1 | 128 | #ifdef GLOBUS_GSI_GSS_ASSIST_MODULE |
129 | if (globus_module_activate(GLOBUS_GSI_GSS_ASSIST_MODULE) != 0) { | |
130 | return 0; | |
131 | } | |
132 | #endif | |
87c01c94 | 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; | |
0ef028e1 | 159 | } |
160 | ||
161 | /* | |
162 | * Export GSI credentials to disk. | |
f4b9ce42 | 163 | */ |
164 | static void | |
165 | ssh_gssapi_gsi_storecreds(ssh_gssapi_client *client) | |
166 | { | |
167 | OM_uint32 major_status; | |
168 | OM_uint32 minor_status; | |
0ef028e1 | 169 | gss_buffer_desc export_cred = GSS_C_EMPTY_BUFFER; |
170 | char * p; | |
f4b9ce42 | 171 | |
0ef028e1 | 172 | if (!client || !client->creds) { |
173 | return; | |
174 | } | |
f4b9ce42 | 175 | |
0ef028e1 | 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) { | |
7cac2b65 | 194 | logit("Failed to parse exported credentials string '%.100s'", |
0ef028e1 | 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 | } | |
ae82558b | 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 | } | |
0ef028e1 | 219 | client->store.envval = strdup(p); |
f4b9ce42 | 220 | #ifdef USE_PAM |
308180eb | 221 | if (options.use_pam) |
222 | do_pam_putenv(client->store.envvar, client->store.envval); | |
f4b9ce42 | 223 | #endif |
0ef028e1 | 224 | gss_release_buffer(&minor_status, &export_cred); |
f4b9ce42 | 225 | } |
226 | ||
da624706 | 227 | /* |
77fa2ab4 | 228 | * Export updated GSI credentials to disk. |
da624706 | 229 | */ |
77fa2ab4 | 230 | static int |
da624706 | 231 | ssh_gssapi_gsi_updatecreds(ssh_gssapi_ccache *store,ssh_gssapi_client *client) |
232 | { | |
233 | ssh_gssapi_gsi_storecreds(client); | |
77fa2ab4 | 234 | return 1; |
da624706 | 235 | } |
236 | ||
f4b9ce42 | 237 | #endif /* GSI */ |
238 | #endif /* GSSAPI */ |