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
244
245
246
247
|
/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
#include "auth-common.h"
#include "userdb.h"
#ifdef USERDB_PASSWD_FILE
#include "istream.h"
#include "str.h"
#include "auth-cache.h"
#include "db-passwd-file.h"
#include <unistd.h>
#include <fcntl.h>
struct passwd_file_userdb_iterate_context {
struct userdb_iterate_context ctx;
struct istream *input;
char *path;
bool skip_passdb_entries;
};
struct passwd_file_userdb_module {
struct userdb_module module;
struct db_passwd_file *pwf;
const char *username_format;
};
static int
passwd_file_add_extra_fields(struct auth_request *request, char *const *fields)
{
string_t *str = t_str_new(512);
const struct var_expand_table *table;
const char *key, *value, *error;
unsigned int i;
table = auth_request_get_var_expand_table(request, NULL);
for (i = 0; fields[i] != NULL; i++) {
if (!str_begins(fields[i], "userdb_"))
continue;
key = fields[i] + 7;
value = strchr(key, '=');
if (value != NULL) {
key = t_strdup_until(key, value);
str_truncate(str, 0);
if (auth_request_var_expand_with_table(str, value + 1,
request, table, NULL, &error) <= 0) {
e_error(authdb_event(request),
"Failed to expand extra field %s: %s",
fields[i], error);
return -1;
}
value = str_c(str);
} else {
value = "";
}
auth_request_set_userdb_field(request, key, value);
}
return 0;
}
static void passwd_file_lookup(struct auth_request *auth_request,
userdb_callback_t *callback)
{
struct userdb_module *_module = auth_request->userdb->userdb;
struct passwd_file_userdb_module *module =
(struct passwd_file_userdb_module *)_module;
struct passwd_user *pu;
int ret;
ret = db_passwd_file_lookup(module->pwf, auth_request,
module->username_format, &pu);
if (ret <= 0 || pu->uid == 0) {
callback(ret < 0 ? USERDB_RESULT_INTERNAL_FAILURE :
USERDB_RESULT_USER_UNKNOWN, auth_request);
return;
}
if (pu->uid != (uid_t)-1) {
auth_request_set_userdb_field(auth_request, "uid",
dec2str(pu->uid));
}
if (pu->gid != (gid_t)-1) {
auth_request_set_userdb_field(auth_request, "gid",
dec2str(pu->gid));
}
if (pu->home != NULL)
auth_request_set_userdb_field(auth_request, "home", pu->home);
if (pu->extra_fields != NULL &&
passwd_file_add_extra_fields(auth_request, pu->extra_fields) < 0) {
callback(USERDB_RESULT_INTERNAL_FAILURE, auth_request);
return;
}
callback(USERDB_RESULT_OK, auth_request);
}
static struct userdb_iterate_context *
passwd_file_iterate_init(struct auth_request *auth_request,
userdb_iter_callback_t *callback, void *context)
{
struct userdb_module *_module = auth_request->userdb->userdb;
struct passwd_file_userdb_module *module =
(struct passwd_file_userdb_module *)_module;
struct passwd_file_userdb_iterate_context *ctx;
int fd;
ctx = i_new(struct passwd_file_userdb_iterate_context, 1);
ctx->ctx.auth_request = auth_request;
ctx->ctx.callback = callback;
ctx->ctx.context = context;
ctx->skip_passdb_entries = !module->pwf->userdb_warn_missing;
if (module->pwf->default_file == NULL) {
e_error(authdb_event(auth_request),
"passwd-file: User iteration isn't currently supported "
"with %%variable paths");
ctx->ctx.failed = TRUE;
return &ctx->ctx;
}
ctx->path = i_strdup(module->pwf->default_file->path);
/* for now we support only a single passwd-file */
fd = open(ctx->path, O_RDONLY);
if (fd == -1) {
e_error(authdb_event(auth_request),
"open(%s) failed: %m", ctx->path);
ctx->ctx.failed = TRUE;
} else {
ctx->input = i_stream_create_fd_autoclose(&fd, SIZE_MAX);
}
return &ctx->ctx;
}
static void passwd_file_iterate_next(struct userdb_iterate_context *_ctx)
{
struct passwd_file_userdb_iterate_context *ctx =
(struct passwd_file_userdb_iterate_context *)_ctx;
const char *line, *p;
if (ctx->input == NULL)
line = NULL;
else {
while ((line = i_stream_read_next_line(ctx->input)) != NULL) {
if (*line == '\0' || *line == ':' || *line == '#')
continue; /* no username or comment */
if (ctx->skip_passdb_entries &&
((p = i_strchr_to_next(line, ':')) == NULL ||
strchr(p, ':') == NULL)) {
/* only passdb info */
continue;
}
break;
}
if (line == NULL && ctx->input->stream_errno != 0) {
e_error(authdb_event(_ctx->auth_request),
"read(%s) failed: %s", ctx->path,
i_stream_get_error(ctx->input));
_ctx->failed = TRUE;
}
}
if (line == NULL)
_ctx->callback(NULL, _ctx->context);
else T_BEGIN {
_ctx->callback(t_strcut(line, ':'), _ctx->context);
} T_END;
}
static int passwd_file_iterate_deinit(struct userdb_iterate_context *_ctx)
{
struct passwd_file_userdb_iterate_context *ctx =
(struct passwd_file_userdb_iterate_context *)_ctx;
int ret = _ctx->failed ? -1 : 0;
i_stream_destroy(&ctx->input);
i_free(ctx->path);
i_free(ctx);
return ret;
}
static struct userdb_module *
passwd_file_preinit(pool_t pool, const char *args)
{
struct passwd_file_userdb_module *module;
const char *format = PASSWD_FILE_DEFAULT_USERNAME_FORMAT;
const char *p;
if (str_begins(args, "username_format=")) {
args += 16;
p = strchr(args, ' ');
if (p == NULL) {
format = p_strdup(pool, args);
args = "";
} else {
format = p_strdup_until(pool, args, p);
args = p + 1;
}
}
if (*args == '\0')
i_fatal("userdb passwd-file: Missing args");
module = p_new(pool, struct passwd_file_userdb_module, 1);
module->pwf = db_passwd_file_init(args, TRUE,
global_auth_settings->debug);
module->username_format = format;
return &module->module;
}
static void passwd_file_init(struct userdb_module *_module)
{
struct passwd_file_userdb_module *module =
(struct passwd_file_userdb_module *)_module;
db_passwd_file_parse(module->pwf);
}
static void passwd_file_deinit(struct userdb_module *_module)
{
struct passwd_file_userdb_module *module =
(struct passwd_file_userdb_module *)_module;
db_passwd_file_unref(&module->pwf);
}
struct userdb_module_interface userdb_passwd_file = {
"passwd-file",
passwd_file_preinit,
passwd_file_init,
passwd_file_deinit,
passwd_file_lookup,
passwd_file_iterate_init,
passwd_file_iterate_next,
passwd_file_iterate_deinit
};
#else
struct userdb_module_interface userdb_passwd_file = {
.name = "passwd-file"
};
#endif
|
