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73b00670 | 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 | ||
40 | /* | |
41 | * Check if this user is OK to login under GSI. User has been authenticated | |
42 | * as identity in global 'client_name.value' and is trying to log in as passed | |
43 | * username in 'name'. | |
44 | * | |
45 | * Returns non-zero if user is authorized, 0 otherwise. | |
46 | */ | |
47 | static int | |
48 | ssh_gssapi_gsi_userok(ssh_gssapi_client *client, char *name) | |
49 | { | |
50 | int authorized = 0; | |
51 | ||
52 | /* This returns 0 on success */ | |
53 | authorized = (globus_gss_assist_userok(client->name.value, | |
54 | name) == 0); | |
55 | ||
56 | debug("GSI user %s is%s authorized as target user %s", | |
57 | (char *) client->name.value, | |
58 | (authorized ? "" : " not"), | |
59 | name); | |
60 | ||
61 | return authorized; | |
62 | } | |
63 | ||
64 | /* | |
65 | * Handle setting up child environment for GSI. | |
66 | * | |
67 | * Make sure that this is called _after_ we've setuid to the user. | |
68 | */ | |
69 | static void | |
70 | ssh_gssapi_gsi_storecreds(ssh_gssapi_client *client) | |
71 | { | |
72 | OM_uint32 major_status; | |
73 | OM_uint32 minor_status; | |
74 | ||
75 | ||
76 | if (client->creds != NULL) | |
77 | { | |
78 | char *creds_env = NULL; | |
79 | ||
80 | /* | |
3e196425 | 81 | * This is the current hack with the GSI gssapi library to |
82 | * export credentials to disk. | |
83 | */ | |
73b00670 | 84 | |
85 | debug("Exporting delegated credentials"); | |
86 | ||
87 | minor_status = 0xdee0; /* Magic value */ | |
88 | major_status = | |
89 | gss_inquire_cred(&minor_status, | |
3e196425 | 90 | client->creds, |
91 | (gss_name_t *) &creds_env, | |
92 | NULL, | |
93 | NULL, | |
94 | NULL); | |
73b00670 | 95 | |
96 | if ((major_status == GSS_S_COMPLETE) && | |
97 | (minor_status == 0xdee1) && | |
98 | (creds_env != NULL)) | |
99 | { | |
100 | char *value; | |
101 | ||
102 | /* | |
3e196425 | 103 | * String is of the form: |
104 | * X509_USER_DELEG_PROXY=filename | |
105 | * so we parse out the filename | |
106 | * and then set X509_USER_PROXY | |
107 | * to point at it. | |
108 | */ | |
73b00670 | 109 | value = strchr(creds_env, '='); |
110 | ||
111 | if (value != NULL) | |
112 | { | |
113 | *value = '\0'; | |
114 | value++; | |
115 | #ifdef USE_PAM | |
116 | do_pam_putenv("X509_USER_PROXY",value); | |
117 | #endif | |
3e196425 | 118 | client->store.filename=NULL; |
73b00670 | 119 | client->store.envvar="X509_USER_PROXY"; |
120 | client->store.envval=strdup(value); | |
121 | ||
122 | return; | |
123 | } | |
124 | else | |
125 | { | |
126 | log("Failed to parse delegated credentials string '%s'", | |
127 | creds_env); | |
128 | } | |
129 | } | |
130 | else | |
131 | { | |
132 | log("Failed to export delegated credentials (error %ld)", | |
133 | major_status); | |
134 | } | |
135 | } | |
136 | } | |
137 | ||
138 | ssh_gssapi_mech gssapi_gsi_mech_old = { | |
139 | "N3+k7/4wGxHyuP8Yxi4RhA==", | |
140 | "GSI", | |
141 | {9, "\x2B\x06\x01\x04\x01\x9B\x50\x01\x01"} | |
142 | NULL, | |
143 | &ssh_gssapi_gsi_userok, | |
144 | NULL, | |
145 | &ssh_gssapi_gsi_storecreds | |
146 | }; | |
147 | ||
148 | ssh_gssapi_mech gssapi_gsi_mech = { | |
149 | "dZuIebMjgUqaxvbF7hDbAw==", | |
150 | "GSI", | |
151 | {9, "\x2B\x06\x01\x04\x01\x9B\x50\x01\x01"} | |
152 | NULL, | |
153 | &ssh_gssapi_gsi_userok, | |
154 | NULL, | |
155 | &ssh_gssapi_gsi_storecreds | |
156 | }; | |
157 | ||
158 | #endif /* GSI */ | |
159 | #endif /* GSSAPI */ |