summaryrefslogtreecommitdiff
path: root/libcli/auth/krb5_wrap.c
blob: 55a224612d11c8895fab4adf9433b4cd48d73d34 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
/*
   Unix SMB/CIFS implementation.
   simple kerberos5 routines for active directory
   Copyright (C) Andrew Tridgell 2001
   Copyright (C) Luke Howard 2002-2003
   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2011
   Copyright (C) Guenther Deschner 2005-2009
   Copyright (C) Simo Sorce 2010.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#ifdef HAVE_KRB5

#include "libcli/auth/krb5_wrap.h"
#include "librpc/gen_ndr/krb5pac.h"

#if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
/* MIT */
int create_kerberos_key_from_string_direct(krb5_context context,
						  krb5_principal host_princ,
						  krb5_data *password,
						  krb5_keyblock *key,
						  krb5_enctype enctype)
{
	int ret = 0;
	krb5_data salt;

	ret = krb5_principal2salt(context, host_princ, &salt);
	if (ret) {
		DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
		return ret;
	}
	ret = krb5_c_string_to_key(context, enctype, password, &salt, key);
	SAFE_FREE(salt.data);

	return ret;
}
#elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
/* Heimdal */
int create_kerberos_key_from_string_direct(krb5_context context,
						  krb5_principal host_princ,
						  krb5_data *password,
						  krb5_keyblock *key,
						  krb5_enctype enctype)
{
	int ret;
	krb5_salt salt;

	ret = krb5_get_pw_salt(context, host_princ, &salt);
	if (ret) {
		DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
		return ret;
	}

	ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
	krb5_free_salt(context, salt);

	return ret;
}
#else
#error UNKNOWN_CREATE_KEY_FUNCTIONS
#endif

 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
{
#if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
	if (pdata->data) {
		krb5_free_data_contents(context, pdata);
	}
#elif defined(HAVE_KRB5_DATA_FREE)
	krb5_data_free(context, pdata);
#else
	SAFE_FREE(pdata->data);
#endif
}


 krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
{
/* Try krb5_free_keytab_entry_contents first, since
 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
 * krb5_kt_free_entry but only has a prototype for the first, while the
 * second is considered private.
 */
#if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
	return krb5_free_keytab_entry_contents(context, kt_entry);
#elif defined(HAVE_KRB5_KT_FREE_ENTRY)
	return krb5_kt_free_entry(context, kt_entry);
#else
#error UNKNOWN_KT_FREE_FUNCTION
#endif
}

/**************************************************************
 Wrappers around kerberos string functions that convert from
 utf8 -> unix charset and vica versa.
**************************************************************/

/**************************************************************
 krb5_parse_name that takes a UNIX charset.
**************************************************************/

 krb5_error_code smb_krb5_parse_name(krb5_context context,
				const char *name, /* in unix charset */
				krb5_principal *principal)
{
	krb5_error_code ret;
	char *utf8_name;
	size_t converted_size;
	TALLOC_CTX *frame = talloc_stackframe();

	if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
		talloc_free(frame);
		return ENOMEM;
	}

	ret = krb5_parse_name(context, utf8_name, principal);
	TALLOC_FREE(frame);
	return ret;
}

#if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
static void krb5_free_unparsed_name(krb5_context context, char *val)
{
	SAFE_FREE(val);
}
#endif

/**************************************************************
 krb5_parse_name that returns a UNIX charset name. Must
 be freed with talloc_free() call.
**************************************************************/

krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
				      krb5_context context,
				      krb5_const_principal principal,
				      char **unix_name)
{
	krb5_error_code ret;
	char *utf8_name;
	size_t converted_size;

	*unix_name = NULL;
	ret = krb5_unparse_name(context, principal, &utf8_name);
	if (ret) {
		return ret;
	}

	if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
		krb5_free_unparsed_name(context, utf8_name);
		return ENOMEM;
	}
	krb5_free_unparsed_name(context, utf8_name);
	return 0;
}

 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context, 
					    const char *name, 
					    krb5_principal *principal)
{
	/* we are cheating here because parse_name will in fact set the realm.
	 * We don't care as the only caller of smb_krb5_parse_name_norealm
	 * ignores the realm anyway when calling
	 * smb_krb5_principal_compare_any_realm later - Guenther */

	return smb_krb5_parse_name(context, name, principal);
}

 bool smb_krb5_principal_compare_any_realm(krb5_context context, 
					  krb5_const_principal princ1, 
					  krb5_const_principal princ2)
{
	return krb5_principal_compare_any_realm(context, princ1, princ2);
}

char *gssapi_error_string(TALLOC_CTX *mem_ctx, 
			  OM_uint32 maj_stat, OM_uint32 min_stat, 
			  const gss_OID mech)
{
	OM_uint32 disp_min_stat, disp_maj_stat;
	gss_buffer_desc maj_error_message;
	gss_buffer_desc min_error_message;
	char *maj_error_string, *min_error_string;
	OM_uint32 msg_ctx = 0;

	char *ret;

	maj_error_message.value = NULL;
	min_error_message.value = NULL;
	maj_error_message.length = 0;
	min_error_message.length = 0;
	
	disp_maj_stat = gss_display_status(&disp_min_stat, maj_stat, GSS_C_GSS_CODE,
			   mech, &msg_ctx, &maj_error_message);
	disp_maj_stat = gss_display_status(&disp_min_stat, min_stat, GSS_C_MECH_CODE,
			   mech, &msg_ctx, &min_error_message);
	
	maj_error_string = talloc_strndup(mem_ctx, (char *)maj_error_message.value, maj_error_message.length);

	min_error_string = talloc_strndup(mem_ctx, (char *)min_error_message.value, min_error_message.length);

	ret = talloc_asprintf(mem_ctx, "%s: %s", maj_error_string, min_error_string);

	talloc_free(maj_error_string);
	talloc_free(min_error_string);

	gss_release_buffer(&disp_min_stat, &maj_error_message);
	gss_release_buffer(&disp_min_stat, &min_error_message);

	return ret;
}


 char *smb_get_krb5_error_message(krb5_context context, krb5_error_code code, TALLOC_CTX *mem_ctx)
{
	char *ret;

#if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
	const char *context_error = krb5_get_error_message(context, code);
	if (context_error) {
		ret = talloc_asprintf(mem_ctx, "%s: %s", error_message(code), context_error);
		krb5_free_error_message(context, context_error);
		return ret;
	}
#endif
	ret = talloc_strdup(mem_ctx, error_message(code));
	return ret;
}

#endif