Annotation of src/usr.bin/ssh/gss-serv-krb5.c, Revision 1.3.6.1
1.3.6.1 ! brad 1: /* $OpenBSD: gss-serv-krb5.c,v 1.4 2005/10/13 19:08:08 stevesk 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: #include <krb5.h>
40:
41: static krb5_context krb_context = NULL;
42:
43: /* Initialise the krb5 library, for the stuff that GSSAPI won't do */
44:
1.2 djm 45: static int
1.3 djm 46: ssh_gssapi_krb5_init(void)
1.1 markus 47: {
48: krb5_error_code problem;
49:
50: if (krb_context != NULL)
51: return 1;
52:
53: problem = krb5_init_context(&krb_context);
54: if (problem) {
55: logit("Cannot initialize krb5 context");
56: return 0;
57: }
58: krb5_init_ets(krb_context);
59:
60: return 1;
61: }
62:
63: /* Check if this user is OK to login. This only works with krb5 - other
64: * GSSAPI mechanisms will need their own.
65: * Returns true if the user is OK to log in, otherwise returns 0
66: */
67:
68: static int
69: ssh_gssapi_krb5_userok(ssh_gssapi_client *client, char *name)
70: {
71: krb5_principal princ;
72: int retval;
73:
74: if (ssh_gssapi_krb5_init() == 0)
75: return 0;
76:
77: if ((retval = krb5_parse_name(krb_context, client->exportedname.value,
78: &princ))) {
79: logit("krb5_parse_name(): %.100s",
80: krb5_get_err_text(krb_context, retval));
81: return 0;
82: }
83: if (krb5_kuserok(krb_context, princ, name)) {
84: retval = 1;
85: logit("Authorized to %s, krb5 principal %s (krb5_kuserok)",
86: name, (char *)client->displayname.value);
87: } else
88: retval = 0;
89:
90: krb5_free_principal(krb_context, princ);
91: return retval;
92: }
93:
94:
95: /* This writes out any forwarded credentials from the structure populated
96: * during userauth. Called after we have setuid to the user */
97:
98: static void
99: ssh_gssapi_krb5_storecreds(ssh_gssapi_client *client)
100: {
101: krb5_ccache ccache;
102: krb5_error_code problem;
103: krb5_principal princ;
104: OM_uint32 maj_status, min_status;
105:
106: if (client->creds == NULL) {
107: debug("No credentials stored");
108: return;
109: }
110:
111: if (ssh_gssapi_krb5_init() == 0)
112: return;
113:
114: if ((problem = krb5_cc_gen_new(krb_context, &krb5_fcc_ops, &ccache))) {
115: logit("krb5_cc_gen_new(): %.100s",
116: krb5_get_err_text(krb_context, problem));
117: return;
118: }
119:
1.2 djm 120: if ((problem = krb5_parse_name(krb_context,
1.1 markus 121: client->exportedname.value, &princ))) {
122: logit("krb5_parse_name(): %.100s",
123: krb5_get_err_text(krb_context, problem));
124: krb5_cc_destroy(krb_context, ccache);
125: return;
126: }
127:
128: if ((problem = krb5_cc_initialize(krb_context, ccache, princ))) {
129: logit("krb5_cc_initialize(): %.100s",
130: krb5_get_err_text(krb_context, problem));
131: krb5_free_principal(krb_context, princ);
132: krb5_cc_destroy(krb_context, ccache);
133: return;
134: }
135:
136: krb5_free_principal(krb_context, princ);
137:
1.2 djm 138: if ((maj_status = gss_krb5_copy_ccache(&min_status,
1.1 markus 139: client->creds, ccache))) {
140: logit("gss_krb5_copy_ccache() failed");
141: krb5_cc_destroy(krb_context, ccache);
142: return;
143: }
144:
145: client->store.filename = xstrdup(krb5_cc_get_name(krb_context, ccache));
146: client->store.envvar = "KRB5CCNAME";
147: client->store.envval = xstrdup(client->store.filename);
148:
149: krb5_cc_close(krb_context, ccache);
150:
151: return;
152: }
153:
154: ssh_gssapi_mech gssapi_kerberos_mech = {
155: "toWM5Slw5Ew8Mqkay+al2g==",
156: "Kerberos",
157: {9, "\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"},
158: NULL,
159: &ssh_gssapi_krb5_userok,
160: NULL,
161: &ssh_gssapi_krb5_storecreds
162: };
163:
164: #endif /* KRB5 */
165:
166: #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