Line data Source code
1 : /*
2 : Unix SMB/CIFS implementation.
3 : kerberos authorization data (PAC) utility library
4 : Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
5 : Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
6 : Copyright (C) Andrew Tridgell 2001
7 : Copyright (C) Luke Howard 2002-2003
8 : Copyright (C) Stefan Metzmacher 2004-2005
9 : Copyright (C) Guenther Deschner 2005,2007,2008
10 :
11 : This program is free software; you can redistribute it and/or modify
12 : it under the terms of the GNU General Public License as published by
13 : the Free Software Foundation; either version 3 of the License, or
14 : (at your option) any later version.
15 :
16 : This program is distributed in the hope that it will be useful,
17 : but WITHOUT ANY WARRANTY; without even the implied warranty of
18 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 : GNU General Public License for more details.
20 :
21 : You should have received a copy of the GNU General Public License
22 : along with this program. If not, see <http://www.gnu.org/licenses/>.
23 : */
24 :
25 : #include "includes.h"
26 : #include "librpc/gen_ndr/ndr_krb5pac.h"
27 : #include "smb_krb5.h"
28 : #include "libads/kerberos_proto.h"
29 : #include "auth/common_auth.h"
30 : #include "lib/param/param.h"
31 : #include "librpc/crypto/gse.h"
32 : #include "auth/gensec/gensec.h"
33 : #include "auth/gensec/gensec_internal.h" /* TODO: remove this */
34 : #include "../libcli/auth/spnego.h"
35 :
36 : #ifdef HAVE_KRB5
37 :
38 : #include "auth/kerberos/pac_utils.h"
39 :
40 : struct smb_krb5_context;
41 :
42 : /*
43 : * Given the username/password, do a kinit, store the ticket in
44 : * cache_name if specified, and return the PAC_LOGON_INFO (the
45 : * structure containing the important user information such as
46 : * groups).
47 : */
48 0 : NTSTATUS kerberos_return_pac(TALLOC_CTX *mem_ctx,
49 : const char *name,
50 : const char *pass,
51 : time_t time_offset,
52 : time_t *expire_time,
53 : time_t *renew_till_time,
54 : const char *cache_name,
55 : bool request_pac,
56 : bool add_netbios_addr,
57 : time_t renewable_time,
58 : const char *impersonate_princ_s,
59 : const char *local_service,
60 : char **_canon_principal,
61 : char **_canon_realm,
62 : struct PAC_DATA_CTR **_pac_data_ctr)
63 : {
64 : krb5_error_code ret;
65 0 : NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
66 0 : DATA_BLOB tkt = data_blob_null;
67 0 : DATA_BLOB tkt_wrapped = data_blob_null;
68 0 : DATA_BLOB ap_rep = data_blob_null;
69 0 : DATA_BLOB sesskey1 = data_blob_null;
70 0 : const char *auth_princ = NULL;
71 0 : const char *cc = "MEMORY:kerberos_return_pac";
72 : struct auth_session_info *session_info;
73 : struct gensec_security *gensec_server_context;
74 : const struct gensec_security_ops **backends;
75 : struct gensec_settings *gensec_settings;
76 0 : size_t idx = 0;
77 : struct auth4_context *auth_context;
78 : struct loadparm_context *lp_ctx;
79 0 : struct PAC_DATA_CTR *pac_data_ctr = NULL;
80 0 : char *canon_principal = NULL;
81 0 : char *canon_realm = NULL;
82 :
83 0 : TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
84 0 : NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
85 :
86 0 : ZERO_STRUCT(tkt);
87 0 : ZERO_STRUCT(ap_rep);
88 0 : ZERO_STRUCT(sesskey1);
89 :
90 0 : if (!name || !pass) {
91 0 : status = NT_STATUS_INVALID_PARAMETER;
92 0 : goto out;
93 : }
94 :
95 0 : if (_canon_principal != NULL) {
96 0 : *_canon_principal = NULL;
97 : }
98 :
99 0 : if (_canon_realm != NULL) {
100 0 : *_canon_realm = NULL;
101 : }
102 :
103 0 : if (cache_name) {
104 0 : cc = cache_name;
105 : }
106 :
107 0 : if (!strchr_m(name, '@')) {
108 0 : auth_princ = talloc_asprintf(mem_ctx, "%s@%s", name,
109 : lp_realm());
110 : } else {
111 0 : auth_princ = name;
112 : }
113 0 : NT_STATUS_HAVE_NO_MEMORY(auth_princ);
114 :
115 0 : ret = kerberos_kinit_password_ext(auth_princ,
116 : pass,
117 : time_offset,
118 : expire_time,
119 : renew_till_time,
120 : cc,
121 : request_pac,
122 : add_netbios_addr,
123 : renewable_time,
124 : tmp_ctx,
125 : &canon_principal,
126 : &canon_realm,
127 : &status);
128 0 : if (ret) {
129 0 : DEBUG(1,("kinit failed for '%s' with: %s (%d)\n",
130 : auth_princ, error_message(ret), ret));
131 : /* status already set */
132 0 : goto out;
133 : }
134 :
135 0 : DEBUG(10,("got TGT for %s in %s\n", auth_princ, cc));
136 0 : if (expire_time) {
137 0 : DEBUGADD(10,("\tvalid until: %s (%d)\n",
138 : http_timestring(talloc_tos(), *expire_time),
139 : (int)*expire_time));
140 : }
141 0 : if (renew_till_time) {
142 0 : DEBUGADD(10,("\trenewable till: %s (%d)\n",
143 : http_timestring(talloc_tos(), *renew_till_time),
144 : (int)*renew_till_time));
145 : }
146 :
147 : /* we cannot continue with krb5 when UF_DONT_REQUIRE_PREAUTH is set,
148 : * in that case fallback to NTLM - gd */
149 :
150 0 : if (expire_time && renew_till_time &&
151 0 : (*expire_time == 0) && (*renew_till_time == 0)) {
152 0 : status = NT_STATUS_INVALID_LOGON_TYPE;
153 0 : goto out;
154 : }
155 :
156 0 : ret = ads_krb5_cli_get_ticket(mem_ctx,
157 : local_service,
158 : time_offset,
159 : &tkt,
160 : &sesskey1,
161 : 0,
162 : cc,
163 : NULL,
164 : impersonate_princ_s);
165 0 : if (ret) {
166 0 : DEBUG(1,("failed to get ticket for %s: %s\n",
167 : local_service, error_message(ret)));
168 0 : if (impersonate_princ_s) {
169 0 : DEBUGADD(1,("tried S4U2SELF impersonation as: %s\n",
170 : impersonate_princ_s));
171 : }
172 0 : status = krb5_to_nt_status(ret);
173 0 : goto out;
174 : }
175 :
176 : /* wrap that up in a nice GSS-API wrapping */
177 0 : tkt_wrapped = spnego_gen_krb5_wrap(tmp_ctx, tkt, TOK_ID_KRB_AP_REQ);
178 0 : if (tkt_wrapped.data == NULL) {
179 0 : status = NT_STATUS_NO_MEMORY;
180 0 : goto out;
181 : }
182 :
183 0 : auth_context = auth4_context_for_PAC_DATA_CTR(tmp_ctx);
184 0 : if (auth_context == NULL) {
185 0 : status = NT_STATUS_NO_MEMORY;
186 0 : goto out;
187 : }
188 :
189 0 : lp_ctx = loadparm_init_s3(tmp_ctx, loadparm_s3_helpers());
190 0 : if (lp_ctx == NULL) {
191 0 : status = NT_STATUS_INVALID_SERVER_STATE;
192 0 : DEBUG(10, ("loadparm_init_s3 failed\n"));
193 0 : goto out;
194 : }
195 :
196 0 : gensec_settings = lpcfg_gensec_settings(tmp_ctx, lp_ctx);
197 0 : if (gensec_settings == NULL) {
198 0 : status = NT_STATUS_NO_MEMORY;
199 0 : DEBUG(10, ("lpcfg_gensec_settings failed\n"));
200 0 : goto out;
201 : }
202 :
203 0 : backends = talloc_zero_array(gensec_settings,
204 : const struct gensec_security_ops *, 2);
205 0 : if (backends == NULL) {
206 0 : status = NT_STATUS_NO_MEMORY;
207 0 : goto out;
208 : }
209 0 : gensec_settings->backends = backends;
210 :
211 0 : gensec_init();
212 :
213 0 : backends[idx++] = &gensec_gse_krb5_security_ops;
214 :
215 0 : status = gensec_server_start(tmp_ctx, gensec_settings,
216 : auth_context, &gensec_server_context);
217 :
218 0 : if (!NT_STATUS_IS_OK(status)) {
219 0 : DEBUG(1, (__location__ "Failed to start server-side GENSEC to validate a Kerberos ticket: %s\n", nt_errstr(status)));
220 0 : goto out;
221 : }
222 :
223 0 : talloc_unlink(tmp_ctx, lp_ctx);
224 0 : talloc_unlink(tmp_ctx, gensec_settings);
225 0 : talloc_unlink(tmp_ctx, auth_context);
226 :
227 : /* Session info is not complete, do not pass to auth log */
228 0 : gensec_want_feature(gensec_server_context, GENSEC_FEATURE_NO_AUTHZ_LOG);
229 :
230 0 : status = gensec_start_mech_by_oid(gensec_server_context, GENSEC_OID_KERBEROS5);
231 0 : if (!NT_STATUS_IS_OK(status)) {
232 0 : DEBUG(1, (__location__ "Failed to start server-side GENSEC krb5 to validate a Kerberos ticket: %s\n", nt_errstr(status)));
233 0 : goto out;
234 : }
235 :
236 : /* Do a client-server update dance */
237 0 : status = gensec_update(gensec_server_context, tmp_ctx, tkt_wrapped, &ap_rep);
238 0 : if (!NT_STATUS_IS_OK(status)) {
239 0 : DEBUG(1, ("gensec_update() failed: %s\n", nt_errstr(status)));
240 0 : goto out;
241 : }
242 :
243 : /* Now return the PAC information to the callers. We ingore
244 : * the session_info and instead pick out the PAC via the
245 : * private_data on the auth_context */
246 0 : status = gensec_session_info(gensec_server_context, tmp_ctx, &session_info);
247 0 : if (!NT_STATUS_IS_OK(status)) {
248 0 : DEBUG(1, ("Unable to obtain PAC via gensec_session_info\n"));
249 0 : goto out;
250 : }
251 :
252 0 : pac_data_ctr = auth4_context_get_PAC_DATA_CTR(auth_context, mem_ctx);
253 0 : if (pac_data_ctr == NULL) {
254 0 : DEBUG(1,("no PAC\n"));
255 0 : status = NT_STATUS_INVALID_PARAMETER;
256 0 : goto out;
257 : }
258 :
259 0 : *_pac_data_ctr = talloc_move(mem_ctx, &pac_data_ctr);
260 0 : if (_canon_principal != NULL) {
261 0 : *_canon_principal = talloc_move(mem_ctx, &canon_principal);
262 : }
263 0 : if (_canon_realm != NULL) {
264 0 : *_canon_realm = talloc_move(mem_ctx, &canon_realm);
265 : }
266 :
267 0 : out:
268 0 : talloc_free(tmp_ctx);
269 0 : if (cc != cache_name) {
270 0 : ads_kdestroy(cc);
271 : }
272 :
273 0 : data_blob_free(&tkt);
274 0 : data_blob_free(&ap_rep);
275 0 : data_blob_free(&sesskey1);
276 :
277 0 : return status;
278 : }
279 :
280 : #endif
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