Annotation of src/usr.bin/ssh/gss-serv-krb5.c, Revision 1.9
1.9 ! markus 1: /* $OpenBSD: gss-serv-krb5.c,v 1.8 2013/07/20 01:55:13 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: #ifdef GSSAPI
28: #ifdef KRB5
29:
1.7 deraadt 30: #include <sys/types.h>
31:
32: #include "xmalloc.h"
1.9 ! markus 33: #include "sshkey.h"
1.7 deraadt 34: #include "hostfile.h"
1.1 markus 35: #include "auth.h"
36: #include "log.h"
37:
38: #include "ssh-gss.h"
39:
40: #include <krb5.h>
1.8 djm 41: #include <gssapi/gssapi_krb5.h>
1.1 markus 42:
43: static krb5_context krb_context = NULL;
44:
45: /* Initialise the krb5 library, for the stuff that GSSAPI won't do */
46:
1.2 djm 47: static int
1.3 djm 48: ssh_gssapi_krb5_init(void)
1.1 markus 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;
1.8 djm 75: const char *errmsg;
1.1 markus 76:
77: if (ssh_gssapi_krb5_init() == 0)
78: return 0;
79:
80: if ((retval = krb5_parse_name(krb_context, client->exportedname.value,
81: &princ))) {
1.8 djm 82: errmsg = krb5_get_error_message(krb_context, retval);
83: logit("krb5_parse_name(): %.100s", errmsg);
84: krb5_free_error_message(krb_context, errmsg);
1.1 markus 85: return 0;
86: }
87: if (krb5_kuserok(krb_context, princ, name)) {
88: retval = 1;
89: logit("Authorized to %s, krb5 principal %s (krb5_kuserok)",
90: name, (char *)client->displayname.value);
91: } else
92: retval = 0;
93:
94: krb5_free_principal(krb_context, princ);
95: return retval;
96: }
97:
98:
99: /* This writes out any forwarded credentials from the structure populated
100: * during userauth. Called after we have setuid to the user */
101:
102: static void
103: ssh_gssapi_krb5_storecreds(ssh_gssapi_client *client)
104: {
105: krb5_ccache ccache;
106: krb5_error_code problem;
107: krb5_principal princ;
108: OM_uint32 maj_status, min_status;
1.8 djm 109: const char *errmsg;
1.1 markus 110:
111: if (client->creds == NULL) {
112: debug("No credentials stored");
113: return;
114: }
115:
116: if (ssh_gssapi_krb5_init() == 0)
117: return;
118:
1.8 djm 119: if ((problem = krb5_cc_new_unique(krb_context, krb5_fcc_ops.prefix,
120: NULL, &ccache)) != 0) {
121: errmsg = krb5_get_error_message(krb_context, problem);
122: logit("krb5_cc_new_unique(): %.100s", errmsg);
123: krb5_free_error_message(krb_context, errmsg);
1.1 markus 124: return;
125: }
126:
1.2 djm 127: if ((problem = krb5_parse_name(krb_context,
1.1 markus 128: client->exportedname.value, &princ))) {
1.8 djm 129: errmsg = krb5_get_error_message(krb_context, problem);
130: logit("krb5_parse_name(): %.100s", errmsg);
131: krb5_free_error_message(krb_context, errmsg);
1.1 markus 132: krb5_cc_destroy(krb_context, ccache);
133: return;
134: }
135:
136: if ((problem = krb5_cc_initialize(krb_context, ccache, princ))) {
1.8 djm 137: errmsg = krb5_get_error_message(krb_context, problem);
138: logit("krb5_cc_initialize(): %.100s", errmsg);
139: krb5_free_error_message(krb_context, errmsg);
1.1 markus 140: krb5_free_principal(krb_context, princ);
141: krb5_cc_destroy(krb_context, ccache);
142: return;
143: }
144:
145: krb5_free_principal(krb_context, princ);
146:
1.2 djm 147: if ((maj_status = gss_krb5_copy_ccache(&min_status,
1.1 markus 148: client->creds, ccache))) {
149: logit("gss_krb5_copy_ccache() failed");
150: krb5_cc_destroy(krb_context, ccache);
151: return;
152: }
153:
154: client->store.filename = xstrdup(krb5_cc_get_name(krb_context, ccache));
155: client->store.envvar = "KRB5CCNAME";
156: client->store.envval = xstrdup(client->store.filename);
157:
158: krb5_cc_close(krb_context, ccache);
159:
160: return;
161: }
162:
163: ssh_gssapi_mech gssapi_kerberos_mech = {
164: "toWM5Slw5Ew8Mqkay+al2g==",
165: "Kerberos",
166: {9, "\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"},
167: NULL,
168: &ssh_gssapi_krb5_userok,
169: NULL,
170: &ssh_gssapi_krb5_storecreds
171: };
172:
173: #endif /* KRB5 */
174:
175: #endif /* GSSAPI */
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