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
|
/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
#include "auth-common.h"
#include "ioloop.h"
#include "passdb.h"
#include "str.h"
#include "imap-resp-code.h"
#include "imapc-client.h"
#define IMAP_DEFAULT_PORT 143
#define IMAPS_DEFAULT_PORT 993
#define DNS_CLIENT_SOCKET_NAME "dns-client"
struct imap_passdb_module {
struct passdb_module module;
struct imapc_client_settings set;
bool set_have_vars;
};
struct imap_auth_request {
struct imapc_client *client;
struct auth_request *auth_request;
verify_plain_callback_t *verify_callback;
struct timeout *to_free;
};
static enum passdb_result
passdb_imap_get_failure_result(const struct imapc_command_reply *reply)
{
const char *key = reply->resp_text_key;
if (key == NULL)
return PASSDB_RESULT_PASSWORD_MISMATCH;
if (strcasecmp(key, IMAP_RESP_CODE_AUTHFAILED) == 0 ||
strcasecmp(key, IMAP_RESP_CODE_AUTHZFAILED) == 0)
return PASSDB_RESULT_PASSWORD_MISMATCH;
if (strcasecmp(key, IMAP_RESP_CODE_EXPIRED) == 0)
return PASSDB_RESULT_PASS_EXPIRED;
return PASSDB_RESULT_INTERNAL_FAILURE;
}
static void passdb_imap_login_free(struct imap_auth_request *request)
{
timeout_remove(&request->to_free);
imapc_client_deinit(&request->client);
auth_request_unref(&request->auth_request);
}
static void
passdb_imap_login_callback(const struct imapc_command_reply *reply,
void *context)
{
struct imap_auth_request *request = context;
enum passdb_result result = PASSDB_RESULT_INTERNAL_FAILURE;
switch (reply->state) {
case IMAPC_COMMAND_STATE_OK:
result = PASSDB_RESULT_OK;
break;
case IMAPC_COMMAND_STATE_NO:
result = passdb_imap_get_failure_result(reply);
e_info(authdb_event(request->auth_request),
"%s", reply->text_full);
break;
case IMAPC_COMMAND_STATE_AUTH_FAILED:
case IMAPC_COMMAND_STATE_BAD:
case IMAPC_COMMAND_STATE_DISCONNECTED:
e_error(authdb_event(request->auth_request),
"%s", reply->text_full);
break;
}
request->verify_callback(result, request->auth_request);
/* imapc_client can't be freed in this callback, so do it in a
separate callback. FIXME: remove this once imapc supports proper
refcounting. */
request->to_free = timeout_add_short(0, passdb_imap_login_free, request);
}
static void
passdb_imap_verify_plain(struct auth_request *auth_request,
const char *password,
verify_plain_callback_t *callback)
{
struct passdb_module *_module = auth_request->passdb->passdb;
struct imap_passdb_module *module =
(struct imap_passdb_module *)_module;
struct imap_auth_request *request;
struct imapc_client_settings set;
const char *error;
string_t *str;
set = module->set;
set.debug = event_want_debug(auth_request->event);
set.dns_client_socket_path =
t_strconcat(auth_request->set->base_dir, "/",
DNS_CLIENT_SOCKET_NAME, NULL);
set.password = password;
set.max_idle_time = IMAPC_DEFAULT_MAX_IDLE_TIME;
if (set.ssl_set.ca_dir == NULL)
set.ssl_set.ca_dir = auth_request->set->ssl_client_ca_dir;
if (set.ssl_set.ca_file == NULL)
set.ssl_set.ca_file = auth_request->set->ssl_client_ca_file;
if (module->set_have_vars) {
str = t_str_new(128);
if (auth_request_var_expand(str, set.username, auth_request,
NULL, &error) <= 0) {
e_error(authdb_event(auth_request),
"Failed to expand username=%s: %s",
set.username, error);
callback(PASSDB_RESULT_INTERNAL_FAILURE, auth_request);
return;
}
set.username = t_strdup(str_c(str));
str_truncate(str, 0);
if (auth_request_var_expand(str, set.host, auth_request,
NULL, &error) <= 0) {
e_error(authdb_event(auth_request),
"Failed to expand host=%s: %s",
set.host, error);
callback(PASSDB_RESULT_INTERNAL_FAILURE, auth_request);
return;
}
set.host = t_strdup(str_c(str));
}
e_debug(authdb_event(auth_request),
"lookup host=%s port=%d", set.host, set.port);
request = p_new(auth_request->pool, struct imap_auth_request, 1);
request->client = imapc_client_init(&set, authdb_event(auth_request));
request->auth_request = auth_request;
request->verify_callback = callback;
auth_request_ref(auth_request);
imapc_client_set_login_callback(request->client, passdb_imap_login_callback, request);
imapc_client_login(request->client);
}
static struct passdb_module *
passdb_imap_preinit(pool_t pool, const char *args)
{
struct imap_passdb_module *module;
char **tmp;
const char *key, *value;
bool port_set = FALSE;
module = p_new(pool, struct imap_passdb_module, 1);
module->module.default_pass_scheme = "PLAIN";
module->set.port = IMAP_DEFAULT_PORT;
module->set.ssl_mode = IMAPC_CLIENT_SSL_MODE_NONE;
module->set.username = "%u";
module->set.rawlog_dir = "";
for (tmp = p_strsplit(pool, args, " "); *tmp != NULL; tmp++) {
key = *tmp;
value = strchr(key, '=');
if (value == NULL)
value = "";
else
key = t_strdup_until(key, value++);
if (strcmp(key, "host") == 0)
module->set.host = value;
else if (strcmp(key, "port") == 0) {
if (net_str2port(value, &module->set.port) < 0)
i_fatal("passdb imap: Invalid port: %s", value);
port_set = TRUE;
} else if (strcmp(key, "username") == 0)
module->set.username = value;
else if (strcmp(key, "ssl_ca_dir") == 0)
module->set.ssl_set.ca_dir = value;
else if (strcmp(key, "ssl_ca_file") == 0)
module->set.ssl_set.ca_file = value;
else if (strcmp(key, "rawlog_dir") == 0)
module->set.rawlog_dir = value;
else if (strcmp(key, "ssl") == 0) {
if (strcmp(value, "imaps") == 0) {
if (!port_set)
module->set.port = IMAPS_DEFAULT_PORT;
module->set.ssl_mode =
IMAPC_CLIENT_SSL_MODE_IMMEDIATE;
} else if (strcmp(value, "starttls") == 0) {
module->set.ssl_mode =
IMAPC_CLIENT_SSL_MODE_STARTTLS;
} else {
i_fatal("passdb imap: Invalid ssl mode: %s",
value);
}
} else if (strcmp(key, "allow_invalid_cert") == 0) {
if (strcmp(value, "yes") == 0) {
module->set.ssl_set.allow_invalid_cert = TRUE;
} else if (strcmp(value, "no") == 0) {
module->set.ssl_set.allow_invalid_cert = FALSE;
} else {
i_fatal("passdb imap: Invalid allow_invalid_cert value: %s",
value);
}
} else {
i_fatal("passdb imap: Unknown parameter: %s", key);
}
}
if (!module->set.ssl_set.allow_invalid_cert && module->set.ssl_mode != IMAPC_CLIENT_SSL_MODE_NONE) {
if (module->set.ssl_set.ca_dir == NULL && module->set.ssl_set.ca_file == NULL)
i_fatal("passdb imap: Cannot verify certificate without ssl_ca_dir or ssl_ca_file setting");
}
if (module->set.host == NULL)
i_fatal("passdb imap: Missing host parameter");
module->set_have_vars =
strchr(module->set.username, '%') != NULL ||
strchr(module->set.host, '%') != NULL;
return &module->module;
}
static struct passdb_module_interface passdb_imap_plugin = {
"imap",
passdb_imap_preinit,
NULL,
NULL,
passdb_imap_verify_plain,
NULL,
NULL
};
void authdb_imap_init(void);
void authdb_imap_deinit(void);
void authdb_imap_init(void)
{
passdb_register_module(&passdb_imap_plugin);
}
void authdb_imap_deinit(void)
{
passdb_unregister_module(&passdb_imap_plugin);
}
|
