modules/aaa/mod_authn_dbd.c

/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
 * applicable.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "ap_provider.h"
#include "httpd.h"
#include "http_config.h"
#include "http_log.h"
#include "apr_dbd.h"
#include "mod_dbd.h"
#include "apr_strings.h"
#include "mod_auth.h"
#include "apr_md5.h"

module AP_MODULE_DECLARE_DATA authn_dbd_module;

typedef struct {
    const char *user;
    const char *realm;
} authn_dbd_conf;
typedef struct {
    const char *label;
    const char *query;
} authn_dbd_rec;

/* optional function - look it up once in post_config */
static ap_dbd_t *(*authn_dbd_acquire_fn)(request_rec*) = NULL;
static void (*authn_dbd_prepare_fn)(server_rec*, const char*, const char*) = NULL;

static void *authn_dbd_cr_conf(apr_pool_t *pool, char *dummy)
{
    authn_dbd_conf *ret = apr_pcalloc(pool, sizeof(authn_dbd_conf));
    return ret;
}
static void *authn_dbd_merge_conf(apr_pool_t *pool, void *BASE, void *ADD)
{
    authn_dbd_conf *add = ADD;
    authn_dbd_conf *base = BASE;
    authn_dbd_conf *ret = apr_palloc(pool, sizeof(authn_dbd_conf));
    ret->user = (add->user == NULL) ? base->user : add->user;
    ret->realm = (add->realm == NULL) ? base->realm : add->realm;
    return ret;
}
static const char *authn_dbd_prepare(cmd_parms *cmd, void *cfg, const char *query)
{
    static unsigned int label_num = 0;
    char *label;

    if (authn_dbd_prepare_fn == NULL) {
        authn_dbd_prepare_fn = APR_RETRIEVE_OPTIONAL_FN(ap_dbd_prepare);
        if (authn_dbd_prepare_fn == NULL) {
            return "You must load mod_dbd to enable AuthDBD functions";
        }
        authn_dbd_acquire_fn = APR_RETRIEVE_OPTIONAL_FN(ap_dbd_acquire);
    }
    label = apr_psprintf(cmd->pool, "authn_dbd_%d", ++label_num);

    authn_dbd_prepare_fn(cmd->server, query, label);

    /* save the label here for our own use */
    *(void**)cfg = label;
    return NULL;
}
static const command_rec authn_dbd_cmds[] =
{
    AP_INIT_TAKE1("AuthDBDUserPWQuery", authn_dbd_prepare,
                  (void *)APR_OFFSETOF(authn_dbd_conf, user), OR_AUTHCFG,
                  "Query used to fetch password for user"),
    AP_INIT_TAKE1("AuthDBDUserRealmPWQuery", authn_dbd_prepare,
                  (void *)APR_OFFSETOF(authn_dbd_conf, realm), OR_AUTHCFG,
                  "Query used to fetch password for user+realm"),
    {NULL}
};
static authn_status authn_dbd_password(request_rec *r, const char *user,
                                       const char *password)
{
    apr_status_t rv;
    const char *dbd_password = NULL;
    char *colon_pw;
    apr_dbd_prepared_t *statement;
    apr_dbd_results_t *res = NULL;
    apr_dbd_row_t *row = NULL;

    authn_dbd_conf *conf = ap_get_module_config(r->per_dir_config,
                                                &authn_dbd_module);
    ap_dbd_t *dbd = authn_dbd_acquire_fn(r);
    if (dbd == NULL) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                      "Error looking up %s in database", user);
        return AUTH_GENERAL_ERROR;
    }

    if (conf->user == NULL) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "No DBD Authn configured!");
        return AUTH_GENERAL_ERROR;
    }

    statement = apr_hash_get(dbd->prepared, conf->user, APR_HASH_KEY_STRING);
    if (statement == NULL) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "No DBD Authn configured!");
        return AUTH_GENERAL_ERROR;
    }
    if (apr_dbd_pvselect(dbd->driver, r->pool, dbd->handle, &res, statement,
                              0, user, NULL) != 0) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                      "Error looking up %s in database", user);
        return AUTH_GENERAL_ERROR;
    }
    for (rv = apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1);
         rv != -1;
         rv = apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1)) {
        if (rv != 0) {
            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
                      "Error looking up %s in database", user);
            return AUTH_GENERAL_ERROR;
        }
        if (dbd_password == NULL) {
            dbd_password = apr_dbd_get_entry(dbd->driver, row, 0);
        }
	/* we can't break out here or row won't get cleaned up */
    }

    if (!dbd_password) {
        return AUTH_USER_NOT_FOUND;
    }

    colon_pw = ap_strchr(dbd_password, ':');
    if (colon_pw) {
        *colon_pw = '\0';
    }

    rv = apr_password_validate(password, dbd_password);

    if (rv != APR_SUCCESS) {
        return AUTH_DENIED;
    }

    return AUTH_GRANTED;
}
static authn_status authn_dbd_realm(request_rec *r, const char *user,
                                    const char *realm, char **rethash)
{
    apr_status_t rv;
    const char *dbd_hash = NULL;
    char *colon_hash;
    apr_dbd_prepared_t *statement;
    apr_dbd_results_t *res = NULL;
    apr_dbd_row_t *row = NULL;

    authn_dbd_conf *conf = ap_get_module_config(r->per_dir_config,
                                                &authn_dbd_module);
    ap_dbd_t *dbd = authn_dbd_acquire_fn(r);
    if (dbd == NULL) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                      "Error looking up %s in database", user);
        return AUTH_GENERAL_ERROR;
    }
    if (conf->realm == NULL) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "No DBD Authn configured!");
        return AUTH_GENERAL_ERROR;
    }
    statement = apr_hash_get(dbd->prepared, conf->realm, APR_HASH_KEY_STRING);
    if (statement == NULL) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "No DBD Authn configured!");
        return AUTH_GENERAL_ERROR;
    }
    if (apr_dbd_pvselect(dbd->driver, r->pool, dbd->handle, &res, statement,
                              0, user, realm, NULL) != 0) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                      "Error looking up %s:%s in database", user, realm);
        return AUTH_GENERAL_ERROR;
    }
    for (rv = apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1);
         rv != -1;
         rv = apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1)) {
        if (rv != 0) {
            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
                      "Error looking up %s in database", user);
            return AUTH_GENERAL_ERROR;
        }
        if (dbd_hash == NULL) {
            dbd_hash = apr_dbd_get_entry(dbd->driver, row, 0);
        }
	/* we can't break out here or row won't get cleaned up */
    }

    if (!dbd_hash) {
        return AUTH_USER_NOT_FOUND;
    }

    colon_hash = ap_strchr(dbd_hash, ':');
    if (colon_hash) {
        *colon_hash = '\0';
    }

    *rethash = apr_pstrdup(r->pool, dbd_hash);

    return AUTH_USER_FOUND;
}
static void authn_dbd_hooks(apr_pool_t *p)
{
    static const authn_provider authn_dbd_provider = {
        &authn_dbd_password,
        &authn_dbd_realm
    };
    
    ap_register_provider(p, AUTHN_PROVIDER_GROUP, "dbd", "0", &authn_dbd_provider);
}
module AP_MODULE_DECLARE_DATA authn_dbd_module =
{
    STANDARD20_MODULE_STUFF,
    authn_dbd_cr_conf,
    authn_dbd_merge_conf,
    NULL,
    NULL,
    authn_dbd_cmds,
    authn_dbd_hooks
};
1	/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
2	* applicable.
3	*
4	* Licensed under the Apache License, Version 2.0 (the "License");
5	* you may not use this file except in compliance with the License.
6	* You may obtain a copy of the License at
7	*
8	* http://www.apache.org/licenses/LICENSE-2.0
9	*
10	* Unless required by applicable law or agreed to in writing, software
11	* distributed under the License is distributed on an "AS IS" BASIS,
12	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13	* See the License for the specific language governing permissions and
14	* limitations under the License.
15	*/
16
17	#include "ap_provider.h"
18	#include "httpd.h"
19	#include "http_config.h"
20	#include "http_log.h"
21	#include "apr_dbd.h"
22	#include "mod_dbd.h"
23	#include "apr_strings.h"
24	#include "mod_auth.h"
25	#include "apr_md5.h"
26
27	module AP_MODULE_DECLARE_DATA authn_dbd_module;
28
29	typedef struct {
30	const char *user;
31	const char *realm;
32	} authn_dbd_conf;
33	typedef struct {
34	const char *label;
35	const char *query;
36	} authn_dbd_rec;
37
38	/* optional function - look it up once in post_config */
39	static ap_dbd_t (authn_dbd_acquire_fn)(request_rec*) = NULL;
40	static void (authn_dbd_prepare_fn)(server_rec, const char, const char) = NULL;
41
42	static void authn_dbd_cr_conf(apr_pool_t pool, char *dummy)
43	{
44	authn_dbd_conf *ret = apr_pcalloc(pool, sizeof(authn_dbd_conf));
45	return ret;
46	}
47	static void authn_dbd_merge_conf(apr_pool_t pool, void BASE, void ADD)
48	{
49	authn_dbd_conf *add = ADD;
50	authn_dbd_conf *base = BASE;
51	authn_dbd_conf *ret = apr_palloc(pool, sizeof(authn_dbd_conf));
52	ret->user = (add->user == NULL) ? base->user : add->user;
53	ret->realm = (add->realm == NULL) ? base->realm : add->realm;
54	return ret;
55	}
56	static const char authn_dbd_prepare(cmd_parms cmd, void cfg, const char query)
57	{
58	static unsigned int label_num = 0;
59	char *label;
60
61	if (authn_dbd_prepare_fn == NULL) {
62	authn_dbd_prepare_fn = APR_RETRIEVE_OPTIONAL_FN(ap_dbd_prepare);
63	if (authn_dbd_prepare_fn == NULL) {
64	return "You must load mod_dbd to enable AuthDBD functions";
65	}
66	authn_dbd_acquire_fn = APR_RETRIEVE_OPTIONAL_FN(ap_dbd_acquire);
67	}
68	label = apr_psprintf(cmd->pool, "authn_dbd_%d", ++label_num);
69
70	authn_dbd_prepare_fn(cmd->server, query, label);
71
72	/* save the label here for our own use */
73	(void*)cfg = label;
74	return NULL;
75	}
76	static const command_rec authn_dbd_cmds[] =
77	{
78	AP_INIT_TAKE1("AuthDBDUserPWQuery", authn_dbd_prepare,
79	(void *)APR_OFFSETOF(authn_dbd_conf, user), OR_AUTHCFG,
80	"Query used to fetch password for user"),
81	AP_INIT_TAKE1("AuthDBDUserRealmPWQuery", authn_dbd_prepare,
82	(void *)APR_OFFSETOF(authn_dbd_conf, realm), OR_AUTHCFG,
83	"Query used to fetch password for user+realm"),
84	{NULL}
85	};
86	static authn_status authn_dbd_password(request_rec r, const char user,
87	const char *password)
88	{
89	apr_status_t rv;
90	const char *dbd_password = NULL;
91	char *colon_pw;
92	apr_dbd_prepared_t *statement;
93	apr_dbd_results_t *res = NULL;
94	apr_dbd_row_t *row = NULL;
95
96	authn_dbd_conf *conf = ap_get_module_config(r->per_dir_config,
97	&authn_dbd_module);
98	ap_dbd_t *dbd = authn_dbd_acquire_fn(r);
99	if (dbd == NULL) {
100	ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
101	"Error looking up %s in database", user);
102	return AUTH_GENERAL_ERROR;
103	}
104
105	if (conf->user == NULL) {
106	ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "No DBD Authn configured!");
107	return AUTH_GENERAL_ERROR;
108	}
109
110	statement = apr_hash_get(dbd->prepared, conf->user, APR_HASH_KEY_STRING);
111	if (statement == NULL) {
112	ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "No DBD Authn configured!");
113	return AUTH_GENERAL_ERROR;
114	}
115	if (apr_dbd_pvselect(dbd->driver, r->pool, dbd->handle, &res, statement,
116	0, user, NULL) != 0) {
117	ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
118	"Error looking up %s in database", user);
119	return AUTH_GENERAL_ERROR;
120	}
121	for (rv = apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1);
122	rv != -1;
123	rv = apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1)) {
124	if (rv != 0) {
125	ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
126	"Error looking up %s in database", user);
127	return AUTH_GENERAL_ERROR;
128	}
129	if (dbd_password == NULL) {
130	dbd_password = apr_dbd_get_entry(dbd->driver, row, 0);
131	}
132	/* we can't break out here or row won't get cleaned up */
133	}
134
135	if (!dbd_password) {
136	return AUTH_USER_NOT_FOUND;
137	}
138
139	colon_pw = ap_strchr(dbd_password, ':');
140	if (colon_pw) {
141	*colon_pw = '\0';
142	}
143
144	rv = apr_password_validate(password, dbd_password);
145
146	if (rv != APR_SUCCESS) {
147	return AUTH_DENIED;
148	}
149
150	return AUTH_GRANTED;
151	}
152	static authn_status authn_dbd_realm(request_rec r, const char user,
153	const char realm, char *rethash)
154	{
155	apr_status_t rv;
156	const char *dbd_hash = NULL;
157	char *colon_hash;
158	apr_dbd_prepared_t *statement;
159	apr_dbd_results_t *res = NULL;
160	apr_dbd_row_t *row = NULL;
161
162	authn_dbd_conf *conf = ap_get_module_config(r->per_dir_config,
163	&authn_dbd_module);
164	ap_dbd_t *dbd = authn_dbd_acquire_fn(r);
165	if (dbd == NULL) {
166	ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
167	"Error looking up %s in database", user);
168	return AUTH_GENERAL_ERROR;
169	}
170	if (conf->realm == NULL) {
171	ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "No DBD Authn configured!");
172	return AUTH_GENERAL_ERROR;
173	}
174	statement = apr_hash_get(dbd->prepared, conf->realm, APR_HASH_KEY_STRING);
175	if (statement == NULL) {
176	ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "No DBD Authn configured!");
177	return AUTH_GENERAL_ERROR;
178	}
179	if (apr_dbd_pvselect(dbd->driver, r->pool, dbd->handle, &res, statement,
180	0, user, realm, NULL) != 0) {
181	ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
182	"Error looking up %s:%s in database", user, realm);
183	return AUTH_GENERAL_ERROR;
184	}
185	for (rv = apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1);
186	rv != -1;
187	rv = apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1)) {
188	if (rv != 0) {
189	ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
190	"Error looking up %s in database", user);
191	return AUTH_GENERAL_ERROR;
192	}
193	if (dbd_hash == NULL) {
194	dbd_hash = apr_dbd_get_entry(dbd->driver, row, 0);
195	}
196	/* we can't break out here or row won't get cleaned up */
197	}
198
199	if (!dbd_hash) {
200	return AUTH_USER_NOT_FOUND;
201	}
202
203	colon_hash = ap_strchr(dbd_hash, ':');
204	if (colon_hash) {
205	*colon_hash = '\0';
206	}
207
208	*rethash = apr_pstrdup(r->pool, dbd_hash);
209
210	return AUTH_USER_FOUND;
211	}
212	static void authn_dbd_hooks(apr_pool_t *p)
213	{
214	static const authn_provider authn_dbd_provider = {
215	&authn_dbd_password,
216	&authn_dbd_realm
217	};
218
219	ap_register_provider(p, AUTHN_PROVIDER_GROUP, "dbd", "0", &authn_dbd_provider);
220	}
221	module AP_MODULE_DECLARE_DATA authn_dbd_module =
222	{
223	STANDARD20_MODULE_STUFF,
224	authn_dbd_cr_conf,
225	authn_dbd_merge_conf,
226	NULL,
227	NULL,
228	authn_dbd_cmds,
229	authn_dbd_hooks
230	};