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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 | ||
30 | #include "auth.h" | |
31 | #include "auth-pam.h" | |
32 | #include "xmalloc.h" | |
33 | #include "log.h" | |
34 | #include "servconf.h" | |
35 | ||
36 | #include "ssh-gss.h" | |
37 | ||
38 | #include <globus_gss_assist.h> | |
39 | ||
0ef028e1 | 40 | static int ssh_gssapi_gsi_userok(ssh_gssapi_client *client, char *name); |
41 | static int ssh_gssapi_gsi_localname(ssh_gssapi_client *client, char **user); | |
42 | static void ssh_gssapi_gsi_storecreds(ssh_gssapi_client *client); | |
43 | ||
44 | ssh_gssapi_mech gssapi_gsi_mech_old = { | |
45 | "N3+k7/4wGxHyuP8Yxi4RhA==", | |
46 | "GSI", | |
47 | {9, "\x2B\x06\x01\x04\x01\x9B\x50\x01\x01"}, | |
48 | NULL, | |
49 | &ssh_gssapi_gsi_userok, | |
50 | &ssh_gssapi_gsi_localname, | |
51 | &ssh_gssapi_gsi_storecreds | |
52 | }; | |
53 | ||
54 | ssh_gssapi_mech gssapi_gsi_mech = { | |
55 | "dZuIebMjgUqaxvbF7hDbAw==", | |
56 | "GSI", | |
57 | {9, "\x2B\x06\x01\x04\x01\x9B\x50\x01\x01"}, | |
58 | NULL, | |
59 | &ssh_gssapi_gsi_userok, | |
60 | &ssh_gssapi_gsi_localname, | |
61 | &ssh_gssapi_gsi_storecreds | |
62 | }; | |
63 | ||
f4b9ce42 | 64 | /* |
65 | * Check if this user is OK to login under GSI. User has been authenticated | |
66 | * as identity in global 'client_name.value' and is trying to log in as passed | |
67 | * username in 'name'. | |
68 | * | |
69 | * Returns non-zero if user is authorized, 0 otherwise. | |
70 | */ | |
71 | static int | |
72 | ssh_gssapi_gsi_userok(ssh_gssapi_client *client, char *name) | |
73 | { | |
74 | int authorized = 0; | |
75 | ||
0ef028e1 | 76 | #ifdef GLOBUS_GSI_GSS_ASSIST_MODULE |
77 | if (globus_module_activate(GLOBUS_GSI_GSS_ASSIST_MODULE) != 0) { | |
78 | return 0; | |
79 | } | |
80 | #endif | |
81 | ||
f4b9ce42 | 82 | /* This returns 0 on success */ |
83 | authorized = (globus_gss_assist_userok(client->name.value, | |
84 | name) == 0); | |
85 | ||
0ef028e1 | 86 | log("GSI user %s is%s authorized as target user %s", |
87 | (char *) client->name.value, (authorized ? "" : " not"), name); | |
f4b9ce42 | 88 | |
89 | return authorized; | |
90 | } | |
91 | ||
92 | /* | |
0ef028e1 | 93 | * Return the local username associated with the GSI credentials. |
94 | */ | |
95 | int | |
96 | ssh_gssapi_gsi_localname(ssh_gssapi_client *client, char **user) | |
97 | { | |
98 | #ifdef GLOBUS_GSI_GSS_ASSIST_MODULE | |
99 | if (globus_module_activate(GLOBUS_GSI_GSS_ASSIST_MODULE) != 0) { | |
100 | return 0; | |
101 | } | |
102 | #endif | |
103 | return(globus_gss_assist_gridmap(client->name.value, user) == 0); | |
104 | } | |
105 | ||
106 | /* | |
107 | * Export GSI credentials to disk. | |
f4b9ce42 | 108 | */ |
109 | static void | |
110 | ssh_gssapi_gsi_storecreds(ssh_gssapi_client *client) | |
111 | { | |
112 | OM_uint32 major_status; | |
113 | OM_uint32 minor_status; | |
0ef028e1 | 114 | gss_buffer_desc export_cred = GSS_C_EMPTY_BUFFER; |
115 | char * p; | |
f4b9ce42 | 116 | |
0ef028e1 | 117 | if (!client || !client->creds) { |
118 | return; | |
119 | } | |
f4b9ce42 | 120 | |
0ef028e1 | 121 | major_status = gss_export_cred(&minor_status, |
122 | client->creds, | |
123 | GSS_C_NO_OID, | |
124 | 1, | |
125 | &export_cred); | |
126 | if (GSS_ERROR(major_status) && major_status != GSS_S_UNAVAILABLE) { | |
127 | Gssctxt *ctx; | |
128 | ssh_gssapi_build_ctx(&ctx); | |
129 | ctx->major = major_status; | |
130 | ctx->minor = minor_status; | |
131 | ssh_gssapi_set_oid(ctx, &gssapi_gsi_mech.oid); | |
132 | ssh_gssapi_error(ctx); | |
133 | ssh_gssapi_delete_ctx(&ctx); | |
134 | return; | |
135 | } | |
136 | ||
137 | p = strchr((char *) export_cred.value, '='); | |
138 | if (p == NULL) { | |
139 | log("Failed to parse exported credentials string '%.100s'", | |
140 | (char *)export_cred.value); | |
141 | gss_release_buffer(&minor_status, &export_cred); | |
142 | return; | |
143 | } | |
144 | *p++ = '\0'; | |
145 | if (strcmp((char *)export_cred.value,"X509_USER_DELEG_PROXY") == 0) { | |
146 | client->store.envvar = strdup("X509_USER_PROXY"); | |
147 | } else { | |
148 | client->store.envvar = strdup((char *)export_cred.value); | |
149 | } | |
150 | client->store.envval = strdup(p); | |
f4b9ce42 | 151 | #ifdef USE_PAM |
0ef028e1 | 152 | do_pam_putenv(client->store.envvar, client->store.envval); |
f4b9ce42 | 153 | #endif |
0ef028e1 | 154 | if (strncmp(p, "FILE:", 5) == 0) { |
155 | p += 5; | |
156 | } | |
157 | if (access(p, R_OK) == 0) { | |
158 | client->store.filename = strdup(p); | |
159 | } | |
160 | gss_release_buffer(&minor_status, &export_cred); | |
f4b9ce42 | 161 | } |
162 | ||
f4b9ce42 | 163 | #endif /* GSI */ |
164 | #endif /* GSSAPI */ |