summaryrefslogtreecommitdiffstats
path: root/libraries/liblutil/sasl.c
blob: 59819b6ecb0486f59419e1472d7e59ba07753f00 (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
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 1998-2021 The OpenLDAP Foundation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 *
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */

#include "portable.h"

#ifdef HAVE_CYRUS_SASL

#include <stdio.h>
#include <ac/stdlib.h>
#include <ac/string.h>
#include <ac/unistd.h>

#ifdef HAVE_SASL_SASL_H
#include <sasl/sasl.h>
#else
#include <sasl.h>
#endif

#include <ldap.h>
#include "ldap_pvt.h"
#include "lutil_ldap.h"


typedef struct lutil_sasl_defaults_s {
	char *mech;
	char *realm;
	char *authcid;
	char *passwd;
	char *authzid;
	char **resps;
	int nresps;
} lutilSASLdefaults;


void
lutil_sasl_freedefs(
	void *defaults )
{
	lutilSASLdefaults *defs = defaults;

	assert( defs != NULL );
	
	if (defs->mech) ber_memfree(defs->mech);
	if (defs->realm) ber_memfree(defs->realm);
	if (defs->authcid) ber_memfree(defs->authcid);
	if (defs->passwd) ber_memfree(defs->passwd);
	if (defs->authzid) ber_memfree(defs->authzid);
	if (defs->resps) ldap_charray_free(defs->resps);

	ber_memfree(defs);
}

void *
lutil_sasl_defaults(
	LDAP *ld,
	char *mech,
	char *realm,
	char *authcid,
	char *passwd,
	char *authzid )
{
	lutilSASLdefaults *defaults;
	
	defaults = ber_memalloc( sizeof( lutilSASLdefaults ) );

	if( defaults == NULL ) return NULL;

	defaults->mech = mech ? ber_strdup(mech) : NULL;
	defaults->realm = realm ? ber_strdup(realm) : NULL;
	defaults->authcid = authcid ? ber_strdup(authcid) : NULL;
	defaults->passwd = passwd ? ber_strdup(passwd) : NULL;
	defaults->authzid = authzid ? ber_strdup(authzid) : NULL;

	if( defaults->mech == NULL ) {
		ldap_get_option( ld, LDAP_OPT_X_SASL_MECH, &defaults->mech );
	}
	if( defaults->realm == NULL ) {
		ldap_get_option( ld, LDAP_OPT_X_SASL_REALM, &defaults->realm );
	}
	if( defaults->authcid == NULL ) {
		ldap_get_option( ld, LDAP_OPT_X_SASL_AUTHCID, &defaults->authcid );
	}
	if( defaults->authzid == NULL ) {
		ldap_get_option( ld, LDAP_OPT_X_SASL_AUTHZID, &defaults->authzid );
	}
	defaults->resps = NULL;
	defaults->nresps = 0;

	return defaults;
}

static int interaction(
	unsigned flags,
	sasl_interact_t *interact,
	lutilSASLdefaults *defaults )
{
	const char *dflt = interact->defresult;
	char input[1024];

	int noecho=0;
	int challenge=0;

	switch( interact->id ) {
	case SASL_CB_GETREALM:
		if( defaults ) dflt = defaults->realm;
		break;
	case SASL_CB_AUTHNAME:
		if( defaults ) dflt = defaults->authcid;
		break;
	case SASL_CB_PASS:
		if( defaults ) dflt = defaults->passwd;
		noecho = 1;
		break;
	case SASL_CB_USER:
		if( defaults ) dflt = defaults->authzid;
		break;
	case SASL_CB_NOECHOPROMPT:
		noecho = 1;
		challenge = 1;
		break;
	case SASL_CB_ECHOPROMPT:
		challenge = 1;
		break;
	}

	if( dflt && !*dflt ) dflt = NULL;

	if( flags != LDAP_SASL_INTERACTIVE &&
		( dflt || interact->id == SASL_CB_USER ) )
	{
		goto use_default;
	}

	if( flags == LDAP_SASL_QUIET ) {
		/* don't prompt */
		return LDAP_OTHER;
	}

	if( challenge ) {
		if( interact->challenge ) {
			fprintf( stderr, _("Challenge: %s\n"), interact->challenge );
		}
	}

	if( dflt ) {
		fprintf( stderr, _("Default: %s\n"), dflt );
	}

	snprintf( input, sizeof input, "%s: ",
		interact->prompt ? interact->prompt : _("Interact") );

	if( noecho ) {
		interact->result = (char *) getpassphrase( input );
		interact->len = interact->result
			? strlen( interact->result ) : 0;

	} else {
		/* prompt user */
		fputs( input, stderr );

		/* get input */
		interact->result = fgets( input, sizeof(input), stdin );

		if( interact->result == NULL ) {
			interact->len = 0;
			return LDAP_UNAVAILABLE;
		}

		/* len of input */
		interact->len = strlen(input); 

		if( interact->len > 0 && input[interact->len - 1] == '\n' ) {
			/* input includes '\n', trim it */
			interact->len--;
			input[interact->len] = '\0';
		}
	}


	if( interact->len > 0 ) {
		/* duplicate */
		char *p = (char *)interact->result;
		ldap_charray_add(&defaults->resps, interact->result);
		interact->result = defaults->resps[defaults->nresps++];

		/* zap */
		memset( p, '\0', interact->len );

	} else {
use_default:
		/* input must be empty */
		interact->result = (dflt && *dflt) ? dflt : "";
		interact->len = strlen( interact->result );
	}

	return LDAP_SUCCESS;
}

int lutil_sasl_interact(
	LDAP *ld,
	unsigned flags,
	void *defaults,
	void *in )
{
	sasl_interact_t *interact = in;

	if( ld == NULL ) return LDAP_PARAM_ERROR;

	if( flags == LDAP_SASL_INTERACTIVE ) {
		fputs( _("SASL Interaction\n"), stderr );
	}

	while( interact->id != SASL_CB_LIST_END ) {
		int rc = interaction( flags, interact, defaults );

		if( rc )  return rc;
		interact++;
	}
	
	return LDAP_SUCCESS;
}
#endif