Annotation of src/usr.bin/ssh/gss-serv-krb5.c, Revision 1.8
1.8 ! djm 1: /* $OpenBSD: gss-serv-krb5.c,v 1.7 2006/08/03 03:34:42 deraadt 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"
33: #include "key.h"
34: #include "hostfile.h"
1.1 markus 35: #include "auth.h"
36: #include "log.h"
37:
1.7 deraadt 38: #include "buffer.h"
1.1 markus 39: #include "ssh-gss.h"
40:
41: #include <krb5.h>
1.8 ! djm 42: #include <gssapi/gssapi_krb5.h>
1.1 markus 43:
44: static krb5_context krb_context = NULL;
45:
46: /* Initialise the krb5 library, for the stuff that GSSAPI won't do */
47:
1.2 djm 48: static int
1.3 djm 49: ssh_gssapi_krb5_init(void)
1.1 markus 50: {
51: krb5_error_code problem;
52:
53: if (krb_context != NULL)
54: return 1;
55:
56: problem = krb5_init_context(&krb_context);
57: if (problem) {
58: logit("Cannot initialize krb5 context");
59: return 0;
60: }
61: krb5_init_ets(krb_context);
62:
63: return 1;
64: }
65:
66: /* Check if this user is OK to login. This only works with krb5 - other
67: * GSSAPI mechanisms will need their own.
68: * Returns true if the user is OK to log in, otherwise returns 0
69: */
70:
71: static int
72: ssh_gssapi_krb5_userok(ssh_gssapi_client *client, char *name)
73: {
74: krb5_principal princ;
75: int retval;
1.8 ! djm 76: const char *errmsg;
1.1 markus 77:
78: if (ssh_gssapi_krb5_init() == 0)
79: return 0;
80:
81: if ((retval = krb5_parse_name(krb_context, client->exportedname.value,
82: &princ))) {
1.8 ! djm 83: errmsg = krb5_get_error_message(krb_context, retval);
! 84: logit("krb5_parse_name(): %.100s", errmsg);
! 85: krb5_free_error_message(krb_context, errmsg);
1.1 markus 86: return 0;
87: }
88: if (krb5_kuserok(krb_context, princ, name)) {
89: retval = 1;
90: logit("Authorized to %s, krb5 principal %s (krb5_kuserok)",
91: name, (char *)client->displayname.value);
92: } else
93: retval = 0;
94:
95: krb5_free_principal(krb_context, princ);
96: return retval;
97: }
98:
99:
100: /* This writes out any forwarded credentials from the structure populated
101: * during userauth. Called after we have setuid to the user */
102:
103: static void
104: ssh_gssapi_krb5_storecreds(ssh_gssapi_client *client)
105: {
106: krb5_ccache ccache;
107: krb5_error_code problem;
108: krb5_principal princ;
109: OM_uint32 maj_status, min_status;
1.8 ! djm 110: const char *errmsg;
1.1 markus 111:
112: if (client->creds == NULL) {
113: debug("No credentials stored");
114: return;
115: }
116:
117: if (ssh_gssapi_krb5_init() == 0)
118: return;
119:
1.8 ! djm 120: if ((problem = krb5_cc_new_unique(krb_context, krb5_fcc_ops.prefix,
! 121: NULL, &ccache)) != 0) {
! 122: errmsg = krb5_get_error_message(krb_context, problem);
! 123: logit("krb5_cc_new_unique(): %.100s", errmsg);
! 124: krb5_free_error_message(krb_context, errmsg);
1.1 markus 125: return;
126: }
127:
1.2 djm 128: if ((problem = krb5_parse_name(krb_context,
1.1 markus 129: client->exportedname.value, &princ))) {
1.8 ! djm 130: errmsg = krb5_get_error_message(krb_context, problem);
! 131: logit("krb5_parse_name(): %.100s", errmsg);
! 132: krb5_free_error_message(krb_context, errmsg);
1.1 markus 133: krb5_cc_destroy(krb_context, ccache);
134: return;
135: }
136:
137: if ((problem = krb5_cc_initialize(krb_context, ccache, princ))) {
1.8 ! djm 138: errmsg = krb5_get_error_message(krb_context, problem);
! 139: logit("krb5_cc_initialize(): %.100s", errmsg);
! 140: krb5_free_error_message(krb_context, errmsg);
1.1 markus 141: krb5_free_principal(krb_context, princ);
142: krb5_cc_destroy(krb_context, ccache);
143: return;
144: }
145:
146: krb5_free_principal(krb_context, princ);
147:
1.2 djm 148: if ((maj_status = gss_krb5_copy_ccache(&min_status,
1.1 markus 149: client->creds, ccache))) {
150: logit("gss_krb5_copy_ccache() failed");
151: krb5_cc_destroy(krb_context, ccache);
152: return;
153: }
154:
155: client->store.filename = xstrdup(krb5_cc_get_name(krb_context, ccache));
156: client->store.envvar = "KRB5CCNAME";
157: client->store.envval = xstrdup(client->store.filename);
158:
159: krb5_cc_close(krb_context, ccache);
160:
161: return;
162: }
163:
164: ssh_gssapi_mech gssapi_kerberos_mech = {
165: "toWM5Slw5Ew8Mqkay+al2g==",
166: "Kerberos",
167: {9, "\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"},
168: NULL,
169: &ssh_gssapi_krb5_userok,
170: NULL,
171: &ssh_gssapi_krb5_storecreds
172: };
173:
174: #endif /* KRB5 */
175:
176: #endif /* GSSAPI */
![[BACK]](/icons/back.gif){kind=icon}
Return to gss-serv-krb5.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh