Annotation of src/usr.bin/ssh/gss-serv-krb5.c, Revision 1.1.4.2
1.1.4.2 ! brad 1: /* $OpenBSD: gss-serv-krb5.c,v 1.2 2003/11/21 11:57:03 djm Exp $ */
1.1 markus 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:
1.1.4.2 ! brad 47: static int
1.1 markus 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:
1.1.4.2 ! brad 122: if ((problem = krb5_parse_name(krb_context,
1.1 markus 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:
1.1.4.2 ! brad 140: if ((maj_status = gss_krb5_copy_ccache(&min_status,
1.1 markus 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 */
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