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Diffstat (limited to 'gss-serv-krb5.c')
-rw-r--r-- | gss-serv-krb5.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/gss-serv-krb5.c b/gss-serv-krb5.c new file mode 100644 index 000000000..d86872258 --- /dev/null +++ b/gss-serv-krb5.c | |||
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1 | /* $OpenBSD: gss-serv-krb5.c,v 1.1 2003/08/22 10:56:09 markus Exp $ */ | ||
2 | |||
3 | /* | ||
4 | * Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved. | ||
5 | * | ||
6 | * Redistribution and use in source and binary forms, with or without | ||
7 | * modification, are permitted provided that the following conditions | ||
8 | * are met: | ||
9 | * 1. Redistributions of source code must retain the above copyright | ||
10 | * notice, this list of conditions and the following disclaimer. | ||
11 | * 2. Redistributions in binary form must reproduce the above copyright | ||
12 | * notice, this list of conditions and the following disclaimer in the | ||
13 | * documentation and/or other materials provided with the distribution. | ||
14 | * | ||
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR | ||
16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | ||
17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | ||
18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | ||
20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | ||
24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
25 | */ | ||
26 | |||
27 | #include "includes.h" | ||
28 | |||
29 | #ifdef GSSAPI | ||
30 | #ifdef KRB5 | ||
31 | |||
32 | #include "auth.h" | ||
33 | #include "xmalloc.h" | ||
34 | #include "log.h" | ||
35 | #include "servconf.h" | ||
36 | |||
37 | #include "ssh-gss.h" | ||
38 | |||
39 | extern ServerOptions options; | ||
40 | |||
41 | #include <krb5.h> | ||
42 | |||
43 | static krb5_context krb_context = NULL; | ||
44 | |||
45 | /* Initialise the krb5 library, for the stuff that GSSAPI won't do */ | ||
46 | |||
47 | static int | ||
48 | ssh_gssapi_krb5_init() | ||
49 | { | ||
50 | krb5_error_code problem; | ||
51 | |||
52 | if (krb_context != NULL) | ||
53 | return 1; | ||
54 | |||
55 | problem = krb5_init_context(&krb_context); | ||
56 | if (problem) { | ||
57 | logit("Cannot initialize krb5 context"); | ||
58 | return 0; | ||
59 | } | ||
60 | krb5_init_ets(krb_context); | ||
61 | |||
62 | return 1; | ||
63 | } | ||
64 | |||
65 | /* Check if this user is OK to login. This only works with krb5 - other | ||
66 | * GSSAPI mechanisms will need their own. | ||
67 | * Returns true if the user is OK to log in, otherwise returns 0 | ||
68 | */ | ||
69 | |||
70 | static int | ||
71 | ssh_gssapi_krb5_userok(ssh_gssapi_client *client, char *name) | ||
72 | { | ||
73 | krb5_principal princ; | ||
74 | int retval; | ||
75 | |||
76 | if (ssh_gssapi_krb5_init() == 0) | ||
77 | return 0; | ||
78 | |||
79 | if ((retval = krb5_parse_name(krb_context, client->exportedname.value, | ||
80 | &princ))) { | ||
81 | logit("krb5_parse_name(): %.100s", | ||
82 | krb5_get_err_text(krb_context, retval)); | ||
83 | return 0; | ||
84 | } | ||
85 | if (krb5_kuserok(krb_context, princ, name)) { | ||
86 | retval = 1; | ||
87 | logit("Authorized to %s, krb5 principal %s (krb5_kuserok)", | ||
88 | name, (char *)client->displayname.value); | ||
89 | } else | ||
90 | retval = 0; | ||
91 | |||
92 | krb5_free_principal(krb_context, princ); | ||
93 | return retval; | ||
94 | } | ||
95 | |||
96 | |||
97 | /* This writes out any forwarded credentials from the structure populated | ||
98 | * during userauth. Called after we have setuid to the user */ | ||
99 | |||
100 | static void | ||
101 | ssh_gssapi_krb5_storecreds(ssh_gssapi_client *client) | ||
102 | { | ||
103 | krb5_ccache ccache; | ||
104 | krb5_error_code problem; | ||
105 | krb5_principal princ; | ||
106 | OM_uint32 maj_status, min_status; | ||
107 | |||
108 | if (client->creds == NULL) { | ||
109 | debug("No credentials stored"); | ||
110 | return; | ||
111 | } | ||
112 | |||
113 | if (ssh_gssapi_krb5_init() == 0) | ||
114 | return; | ||
115 | |||
116 | if ((problem = krb5_cc_gen_new(krb_context, &krb5_fcc_ops, &ccache))) { | ||
117 | logit("krb5_cc_gen_new(): %.100s", | ||
118 | krb5_get_err_text(krb_context, problem)); | ||
119 | return; | ||
120 | } | ||
121 | |||
122 | if ((problem = krb5_parse_name(krb_context, | ||
123 | client->exportedname.value, &princ))) { | ||
124 | logit("krb5_parse_name(): %.100s", | ||
125 | krb5_get_err_text(krb_context, problem)); | ||
126 | krb5_cc_destroy(krb_context, ccache); | ||
127 | return; | ||
128 | } | ||
129 | |||
130 | if ((problem = krb5_cc_initialize(krb_context, ccache, princ))) { | ||
131 | logit("krb5_cc_initialize(): %.100s", | ||
132 | krb5_get_err_text(krb_context, problem)); | ||
133 | krb5_free_principal(krb_context, princ); | ||
134 | krb5_cc_destroy(krb_context, ccache); | ||
135 | return; | ||
136 | } | ||
137 | |||
138 | krb5_free_principal(krb_context, princ); | ||
139 | |||
140 | if ((maj_status = gss_krb5_copy_ccache(&min_status, | ||
141 | client->creds, ccache))) { | ||
142 | logit("gss_krb5_copy_ccache() failed"); | ||
143 | krb5_cc_destroy(krb_context, ccache); | ||
144 | return; | ||
145 | } | ||
146 | |||
147 | client->store.filename = xstrdup(krb5_cc_get_name(krb_context, ccache)); | ||
148 | client->store.envvar = "KRB5CCNAME"; | ||
149 | client->store.envval = xstrdup(client->store.filename); | ||
150 | |||
151 | krb5_cc_close(krb_context, ccache); | ||
152 | |||
153 | return; | ||
154 | } | ||
155 | |||
156 | ssh_gssapi_mech gssapi_kerberos_mech = { | ||
157 | "toWM5Slw5Ew8Mqkay+al2g==", | ||
158 | "Kerberos", | ||
159 | {9, "\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"}, | ||
160 | NULL, | ||
161 | &ssh_gssapi_krb5_userok, | ||
162 | NULL, | ||
163 | &ssh_gssapi_krb5_storecreds | ||
164 | }; | ||
165 | |||
166 | #endif /* KRB5 */ | ||
167 | |||
168 | #endif /* GSSAPI */ | ||