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- Committer: Teddy Hogeborn
- Date: 2024-09-08 00:08:15 UTC
- Revision ID: teddy@recompile.se-20240908000815-x3gr5xion3kyyoio
Improve documentation
* mandos.conf.xml (DESCRIPTION): Remove the unnecessary word "simple".
* plugin-runner.xml (PLUGINS): Remove the unnecessary word "simply",
and add the "executable" qualifier to the description of plugins.
* mandos-client.xml (DESCRIPTION, OPTIONS): Do not refer to
"plugin-runner"; instead refer to the section "OVERVIEW".
(OVERVIEW): Don't only describe plugin-runner; also describe
how password-agent can start mandos-client.
(EXAMPLE): Do not refer to "plugin-runner"; instead refer to the
section "OVERVIEW".
(SEE ALSO): Replace reference to "password-prompt" with
"password-agent".
* mandos.conf.xml (DESCRIPTION): Remove the unnecessary word "simple".
* plugin-runner.xml (PLUGINS): Remove the unnecessary word "simply",
and add the "executable" qualifier to the description of plugins.
* mandos-client.xml (DESCRIPTION, OPTIONS): Do not refer to
"plugin-runner"; instead refer to the section "OVERVIEW".
(OVERVIEW): Don't only describe plugin-runner; also describe
how password-agent can start mandos-client.
(EXAMPLE): Do not refer to "plugin-runner"; instead refer to the
section "OVERVIEW".
(SEE ALSO): Replace reference to "password-prompt" with
"password-agent".
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2022 Teddy Hogeborn
6
* Copyright © 2008-2022 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
16
19
*
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
20
22
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
22
24
*/
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
27
getline(), asprintf(), O_CLOEXEC,
28
scandirat(), pipe2() */
29
#include <argp.h> /* argp_program_version,
30
argp_program_bug_address,
31
struct argp_option,
32
struct argp_state, argp_error(),
33
ARGP_NO_EXIT, argp_state_help,
34
ARGP_HELP_STD_HELP,
35
ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
36
ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
37
struct argp, argp_parse(),
38
ARGP_IN_ORDER, ARGP_NO_HELP */
39
#include <stdbool.h> /* bool, false, true */
40
#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
41
getuid(), setgid(), setuid() */
26
42
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
43
#include <iso646.h> /* or, and, not */
44
#include <string.h> /* strcmp(), strdup(), strchrnul(),
45
strncmp(), strlen(), strcpy(),
46
strsep(), strchr(), strsignal() */
47
#include <stdlib.h> /* malloc(), free(), reallocarray(),
48
realloc(), EXIT_SUCCESS */
49
#include <errno.h> /* errno, EINTR, ENOMEM, ECHILD,
50
error_t, EINVAL, EMFILE, ENFILE,
51
ENOENT, ESRCH */
52
#include <stdint.h> /* SIZE_MAX */
53
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
54
getline(), asprintf(), O_CLOEXEC,
55
scandirat(), pipe2() */
56
#include <unistd.h> /* TEMP_FAILURE_RETRY(), ssize_t,
57
write(), STDOUT_FILENO, uid_t,
58
gid_t, getuid(), fchown(), close(),
59
symlink(), setgid(), setuid(),
60
faccessat(), X_OK, pipe(), pipe2(),
61
fork(), _exit(), dup2(), fexecve(),
62
read(), getpass() */
52
63
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
55
#include <errno.h> /* errno */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
64
FD_CLOEXEC, open(), O_RDONLY,
65
O_CLOEXEC, openat() */
66
#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
67
WEXITSTATUS(), WIFSIGNALED(),
68
WTERMSIG(), wait() */
69
#include <error.h> /* error() */
70
#include <stdio.h> /* FILE, fprintf(), fopen(),
71
getline(), fclose(), EOF,
72
asprintf(), stderr */
73
#include <dirent.h> /* struct dirent, scandirat(),
74
alphasort() */
75
#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
76
lstat(), S_ISREG() */
77
#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
78
FD_SET(), select(), FD_CLR(),
79
FD_ISSET() */
80
#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
81
sigemptyset(), sigaddset(),
82
SIGCHLD, sigprocmask(), SIG_BLOCK,
83
SIG_UNBLOCK, kill(), SIGTERM */
84
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
85
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
66
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#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
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const char *argp_program_version = "plugin-runner 1.0";
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
73
struct process;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
91
92
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
95
96
const char *argp_program_version = "plugin-runner " VERSION;
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
86
98
87
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typedef struct plugin{
88
100
char *name; /* can be NULL or any plugin name */
91
103
char **environ;
92
104
int envc;
93
105
bool disabled;
106
107
/* Variables used for running processes*/
108
pid_t pid;
109
int fd;
110
char *buffer;
111
size_t buffer_size;
112
size_t buffer_length;
113
bool eof;
114
volatile sig_atomic_t completed;
115
int status;
94
116
struct plugin *next;
95
117
} plugin;
96
118
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
if ((p->name == name)
100
or (p->name and name and (strcmp(p->name, name) == 0))){
119
static plugin *plugin_list = NULL;
120
121
/* Gets an existing plugin based on name,
122
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
124
static plugin *getplugin(char *name){
125
/* Check for existing plugin with that name */
126
for(plugin *p = plugin_list; p != NULL; p = p->next){
127
if((p->name == name)
128
or (p->name and name and (strcmp(p->name, name) == 0))){
101
129
return p;
102
130
}
103
131
}
104
132
/* Create a new plugin */
105
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
133
plugin *new_plugin = NULL;
134
do {
135
new_plugin = malloc(sizeof(plugin));
136
} while(new_plugin == NULL and errno == EINTR);
137
if(new_plugin == NULL){
107
138
return NULL;
108
139
}
109
140
char *copy_name = NULL;
110
141
if(name != NULL){
111
copy_name = strdup(name);
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
112
145
if(copy_name == NULL){
146
int e = errno;
147
free(new_plugin);
148
errno = e;
113
149
return NULL;
114
150
}
115
151
}
116
152
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
153
*new_plugin = (plugin){ .name = copy_name,
154
.argc = 1,
155
.disabled = false,
156
.next = plugin_list };
122
157
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
158
do {
159
new_plugin->argv = malloc(sizeof(char *) * 2);
160
} while(new_plugin->argv == NULL and errno == EINTR);
161
if(new_plugin->argv == NULL){
162
int e = errno;
125
163
free(copy_name);
126
164
free(new_plugin);
165
errno = e;
127
166
return NULL;
128
167
}
129
168
new_plugin->argv[0] = copy_name;
130
169
new_plugin->argv[1] = NULL;
131
132
new_plugin->environ = malloc(sizeof(char *));
170
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
133
174
if(new_plugin->environ == NULL){
175
int e = errno;
134
176
free(copy_name);
135
177
free(new_plugin->argv);
136
178
free(new_plugin);
179
errno = e;
137
180
return NULL;
138
181
}
139
182
new_plugin->environ[0] = NULL;
183
140
184
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
185
plugin_list = new_plugin;
142
186
return new_plugin;
143
187
}
144
188
145
189
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
146
191
static bool add_to_char_array(const char *new, char ***array,
147
192
int *len){
148
193
/* Resize the pointed-to array to hold one more pointer */
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
194
char **new_array = NULL;
195
do {
196
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
197
new_array = reallocarray(*array, (size_t)((*len) + 2),
198
sizeof(char *));
199
#else
200
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
201
/* overflow */
202
new_array = NULL;
203
errno = ENOMEM;
204
} else {
205
new_array = realloc(*array, (size_t)((*len) + 2)
206
* sizeof(char *));
207
}
208
#endif
209
} while(new_array == NULL and errno == EINTR);
151
210
/* Malloc check */
152
if(*array == NULL){
211
if(new_array == NULL){
153
212
return false;
154
213
}
214
*array = new_array;
155
215
/* Make a copy of the new string */
156
char *copy = strdup(new);
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
157
220
if(copy == NULL){
158
221
return false;
159
222
}
166
229
}
167
230
168
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
169
233
static bool add_argument(plugin *p, const char *arg){
170
234
if(p == NULL){
171
235
return false;
174
238
}
175
239
176
240
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
241
__attribute__((nonnull(2), warn_unused_result))
242
static bool add_environment(plugin *p, const char *def, bool replace){
178
243
if(p == NULL){
179
244
return false;
180
245
}
246
/* namelen = length of name of environment variable */
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
248
/* Search for this environment variable */
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
251
/* It already exists */
252
if(replace){
253
char *new_envdef;
254
do {
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
258
return false;
259
}
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
262
}
263
return true;
264
}
265
}
181
266
return add_to_char_array(def, &(p->environ), &(p->envc));
182
267
}
183
268
184
269
#ifndef O_CLOEXEC
185
270
/*
186
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
272
* Descriptor Flags".
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
189
274
*/
190
static int set_cloexec_flag(int fd)
191
{
192
int ret = fcntl(fd, F_GETFD, 0);
275
__attribute__((warn_unused_result))
276
static int set_cloexec_flag(int fd){
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
193
278
/* If reading the flags failed, return error indication now. */
194
279
if(ret < 0){
195
280
return ret;
196
281
}
197
282
/* Store modified flag word in the descriptor. */
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
199
285
}
286
#endif /* not O_CLOEXEC */
200
287
201
process *process_list = NULL;
202
288
203
289
/* Mark processes as completed when they exit, and save their exit
204
290
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
291
static void handle_sigchld(__attribute__((unused)) int sig){
292
int old_errno = errno;
206
293
while(true){
207
process *proc = process_list;
294
plugin *proc = plugin_list;
208
295
int status;
209
296
pid_t pid = waitpid(-1, &status, WNOHANG);
210
297
if(pid == 0){
212
299
break;
213
300
}
214
301
if(pid == -1){
215
if (errno != ECHILD){
216
perror("waitpid");
302
if(errno == ECHILD){
303
/* No child processes */
304
break;
217
305
}
218
/* No child processes */
219
break;
306
error(0, errno, "waitpid");
220
307
}
221
308
222
309
/* A child exited, find it in process_list */
223
310
while(proc != NULL and proc->pid != pid){
224
311
proc = proc->next;
228
315
continue;
229
316
}
230
317
proc->status = status;
231
proc->completed = true;
318
proc->completed = 1;
232
319
}
320
errno = old_errno;
233
321
}
234
322
235
bool print_out_password(const char *buffer, size_t length){
323
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
325
static bool print_out_password(const char *buffer, size_t length){
236
326
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
327
for(size_t written = 0; written < length; written += (size_t)ret){
241
328
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
329
length - written));
247
334
return true;
248
335
}
249
336
250
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
return NULL;
337
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
339
static void free_plugin(plugin *plugin_node){
340
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
342
free(*arg);
343
}
344
free(plugin_node->name);
345
free(plugin_node->argv);
346
for(char **env = plugin_node->environ; *env != NULL; env++){
347
free(*env);
348
}
349
free(plugin_node->environ);
350
free(plugin_node->buffer);
351
352
/* Removes the plugin from the singly-linked list */
353
if(plugin_node == plugin_list){
354
/* First one - simple */
355
plugin_list = plugin_list->next;
356
} else {
357
/* Second one or later */
358
for(plugin *p = plugin_list; p != NULL; p = p->next){
359
if(p->next == plugin_node){
360
p->next = plugin_node->next;
361
break;
362
}
256
363
}
257
argv[0] = NULL; /* Will be set to argv[0] in main before
258
parsing */
259
argv[1] = NULL;
260
}
261
*argc += 1;
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
264
if(argv == NULL){
265
return NULL;
266
}
267
argv[*argc-1] = arg;
268
argv[*argc] = NULL;
269
return argv;
364
}
365
366
free(plugin_node);
270
367
}
271
368
272
static void free_plugin_list(plugin *plugin_list){
273
for(plugin *next; plugin_list != NULL; plugin_list = next){
274
next = plugin_list->next;
275
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
276
free(*arg);
277
}
278
free(plugin_list->argv);
279
for(char **env = plugin_list->environ; *env != NULL; env++){
280
free(*env);
281
}
282
free(plugin_list->environ);
283
free(plugin_list);
369
static void free_plugin_list(void){
370
while(plugin_list != NULL){
371
free_plugin(plugin_list);
284
372
}
285
373
}
286
374
287
375
int main(int argc, char *argv[]){
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
378
char *argfile = NULL;
290
379
FILE *conffp;
291
size_t d_name_len;
292
DIR *dir = NULL;
293
struct dirent *dirst;
380
struct dirent **direntries = NULL;
294
381
struct stat st;
295
382
fd_set rfds_all;
296
383
int ret, maxfd = 0;
384
ssize_t sret;
297
385
uid_t uid = 65534;
298
386
gid_t gid = 65534;
299
387
bool debug = false;
303
391
.sa_flags = SA_NOCLDSTOP };
304
392
char **custom_argv = NULL;
305
393
int custom_argc = 0;
394
int dir_fd = -1;
306
395
307
396
/* Establish a signal handler */
308
397
sigemptyset(&sigchld_action.sa_mask);
309
398
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
310
399
if(ret == -1){
311
perror("sigaddset");
312
exitstatus = EXIT_FAILURE;
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
313
402
goto fallback;
314
403
}
315
404
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
316
405
if(ret == -1){
317
perror("sigaction");
318
exitstatus = EXIT_FAILURE;
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
319
408
goto fallback;
320
409
}
321
410
324
413
{ .name = "global-options", .key = 'g',
325
414
.arg = "OPTION[,OPTION[,...]]",
326
415
.doc = "Options passed to all plugins" },
327
{ .name = "global-envs", .key = 'e',
416
{ .name = "global-env", .key = 'G',
328
417
.arg = "VAR=value",
329
418
.doc = "Environment variable passed to all plugins" },
330
419
{ .name = "options-for", .key = 'o',
331
420
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
332
421
.doc = "Options passed only to specified plugin" },
333
{ .name = "envs-for", .key = 'f',
422
{ .name = "env-for", .key = 'E',
334
423
.arg = "PLUGIN:ENV=value",
335
424
.doc = "Environment variable passed to specified plugin" },
336
425
{ .name = "disable", .key = 'd',
337
426
.arg = "PLUGIN",
338
427
.doc = "Disable a specific plugin", .group = 1 },
428
{ .name = "enable", .key = 'e',
429
.arg = "PLUGIN",
430
.doc = "Enable a specific plugin", .group = 1 },
339
431
{ .name = "plugin-dir", .key = 128,
340
432
.arg = "DIRECTORY",
341
433
.doc = "Specify a different plugin directory", .group = 2 },
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
349
.doc = "Debug mode", .group = 3 },
434
{ .name = "config-file", .key = 129,
435
.arg = "FILE",
436
.doc = "Specify a different configuration file", .group = 2 },
437
{ .name = "userid", .key = 130,
438
.arg = "ID", .flags = 0,
439
.doc = "User ID the plugins will run as", .group = 3 },
440
{ .name = "groupid", .key = 131,
441
.arg = "ID", .flags = 0,
442
.doc = "Group ID the plugins will run as", .group = 3 },
443
{ .name = "debug", .key = 132,
444
.doc = "Debug mode", .group = 4 },
445
{ .name = "plugin-helper-dir", .key = 133,
446
.arg = "DIRECTORY",
447
.doc = "Specify a different plugin helper directory",
448
.group = 2 },
449
/*
450
* These reproduce what we would get without ARGP_NO_HELP
451
*/
452
{ .name = "help", .key = '?',
453
.doc = "Give this help list", .group = -1 },
454
{ .name = "usage", .key = -3,
455
.doc = "Give a short usage message", .group = -1 },
456
{ .name = "version", .key = 'V',
457
.doc = "Print program version", .group = -1 },
350
458
{ .name = NULL }
351
459
};
352
460
353
error_t parse_opt (int key, char *arg, struct argp_state *state) {
354
/* Get the INPUT argument from `argp_parse', which we know is a
355
pointer to our plugin list pointer. */
356
plugin **plugins = state->input;
357
switch (key) {
358
case 'g':
359
if (arg != NULL){
360
char *p;
361
while((p = strsep(&arg, ",")) != NULL){
362
if(p[0] == '\0'){
363
continue;
364
}
365
if(not add_argument(getplugin(NULL, plugins), p)){
366
perror("add_argument");
367
return ARGP_ERR_UNKNOWN;
368
}
369
}
370
}
371
break;
372
case 'e':
373
if(arg == NULL){
374
break;
375
}
376
{
377
char *envdef = strdup(arg);
378
if(envdef == NULL){
379
break;
380
}
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
383
}
384
}
385
break;
386
case 'o':
387
if (arg != NULL){
388
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
390
break;
391
}
392
char *opt = strsep(&arg, ":");
393
if(opt[0] == '\0'){
394
break;
395
}
396
if(opt != NULL){
397
char *p;
398
while((p = strsep(&opt, ",")) != NULL){
399
if(p[0] == '\0'){
400
continue;
401
}
402
if(not add_argument(getplugin(p_name, plugins), p)){
403
perror("add_argument");
404
return ARGP_ERR_UNKNOWN;
405
}
406
}
407
}
408
}
409
break;
410
case 'f':
411
if(arg == NULL){
412
break;
413
}
461
__attribute__((nonnull(3)))
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
463
errno = 0;
464
switch(key){
465
char *tmp;
466
intmax_t tmp_id;
467
case 'g': /* --global-options */
468
{
469
char *plugin_option;
470
while((plugin_option = strsep(&arg, ",")) != NULL){
471
if(not add_argument(getplugin(NULL), plugin_option)){
472
break;
473
}
474
}
475
errno = 0;
476
}
477
break;
478
case 'G': /* --global-env */
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
481
}
482
break;
483
case 'o': /* --options-for */
484
{
485
char *option_list = strchr(arg, ':');
486
if(option_list == NULL){
487
argp_error(state, "No colon in \"%s\"", arg);
488
errno = EINVAL;
489
break;
490
}
491
*option_list = '\0';
492
option_list++;
493
if(arg[0] == '\0'){
494
argp_error(state, "Empty plugin name");
495
errno = EINVAL;
496
break;
497
}
498
char *option;
499
while((option = strsep(&option_list, ",")) != NULL){
500
if(not add_argument(getplugin(arg), option)){
501
break;
502
}
503
}
504
errno = 0;
505
}
506
break;
507
case 'E': /* --env-for */
414
508
{
415
509
char *envdef = strchr(arg, ':');
416
510
if(envdef == NULL){
417
break;
418
}
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
420
if(p_name == NULL){
421
break;
422
}
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
513
break;
514
}
515
*envdef = '\0';
423
516
envdef++;
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
425
perror("add_environment");
426
}
427
}
428
break;
429
case 'd':
430
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
432
if(p == NULL){
433
return ARGP_ERR_UNKNOWN;
434
}
435
p->disabled = true;
436
}
437
break;
438
case 128:
439
plugindir = arg;
440
break;
441
case 129:
442
uid = (uid_t)strtol(arg, NULL, 10);
443
break;
444
case 130:
445
gid = (gid_t)strtol(arg, NULL, 10);
446
break;
447
case 131:
517
if(arg[0] == '\0'){
518
argp_error(state, "Empty plugin name");
519
errno = EINVAL;
520
break;
521
}
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
524
}
525
}
526
break;
527
case 'd': /* --disable */
528
{
529
plugin *p = getplugin(arg);
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
533
}
534
}
535
break;
536
case 'e': /* --enable */
537
{
538
plugin *p = getplugin(arg);
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
542
}
543
}
544
break;
545
case 128: /* --plugin-dir */
546
free(plugindir);
547
plugindir = strdup(arg);
548
if(plugindir != NULL){
549
errno = 0;
550
}
551
break;
552
case 129: /* --config-file */
553
/* This is already done by parse_opt_config_file() */
554
break;
555
case 130: /* --userid */
556
tmp_id = strtoimax(arg, &tmp, 10);
557
if(errno != 0 or tmp == arg or *tmp != '\0'
558
or tmp_id != (uid_t)tmp_id){
559
argp_error(state, "Bad user ID number: \"%s\", using %"
560
PRIdMAX, arg, (intmax_t)uid);
561
break;
562
}
563
uid = (uid_t)tmp_id;
564
errno = 0;
565
break;
566
case 131: /* --groupid */
567
tmp_id = strtoimax(arg, &tmp, 10);
568
if(errno != 0 or tmp == arg or *tmp != '\0'
569
or tmp_id != (gid_t)tmp_id){
570
argp_error(state, "Bad group ID number: \"%s\", using %"
571
PRIdMAX, arg, (intmax_t)gid);
572
break;
573
}
574
gid = (gid_t)tmp_id;
575
errno = 0;
576
break;
577
case 132: /* --debug */
448
578
debug = true;
449
579
break;
450
case ARGP_KEY_ARG:
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
452
break;
453
case ARGP_KEY_END:
454
break;
455
default:
456
return ARGP_ERR_UNKNOWN;
457
}
458
return 0;
459
}
460
461
plugin *plugin_list = NULL;
462
463
struct argp argp = { .options = options, .parser = parse_opt,
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
580
case 133: /* --plugin-helper-dir */
581
free(pluginhelperdir);
582
pluginhelperdir = strdup(arg);
583
if(pluginhelperdir != NULL){
584
errno = 0;
585
}
586
break;
587
/*
588
* These reproduce what we would get without ARGP_NO_HELP
589
*/
590
case '?': /* --help */
591
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
592
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
594
case -3: /* --usage */
595
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
596
argp_state_help(state, state->out_stream,
597
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
599
case 'V': /* --version */
600
fprintf(state->out_stream, "%s\n", argp_program_version);
601
exit(EXIT_SUCCESS);
602
break;
603
/*
604
* When adding more options before this line, remember to also add a
605
* "case" to the "parse_opt_config_file" function below.
606
*/
607
case ARGP_KEY_ARG:
608
/* Cryptsetup always passes an argument, which is an empty
609
string if "none" was specified in /etc/crypttab. So if
610
argument was empty, we ignore it silently. */
611
if(arg[0] == '\0'){
612
break;
613
}
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
619
default:
620
return ARGP_ERR_UNKNOWN;
621
}
622
return errno; /* Set to 0 at start */
623
}
624
625
/* This option parser is the same as parse_opt() above, except it
626
ignores everything but the --config-file option. */
627
error_t parse_opt_config_file(int key, char *arg,
628
__attribute__((unused))
629
struct argp_state *state){
630
errno = 0;
631
switch(key){
632
case 'g': /* --global-options */
633
case 'G': /* --global-env */
634
case 'o': /* --options-for */
635
case 'E': /* --env-for */
636
case 'd': /* --disable */
637
case 'e': /* --enable */
638
case 128: /* --plugin-dir */
639
break;
640
case 129: /* --config-file */
641
free(argfile);
642
argfile = strdup(arg);
643
if(argfile != NULL){
644
errno = 0;
645
}
646
break;
647
case 130: /* --userid */
648
case 131: /* --groupid */
649
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
654
case ARGP_KEY_ARG:
655
break;
656
default:
657
return ARGP_ERR_UNKNOWN;
658
}
659
return errno;
660
}
661
662
struct argp argp = { .options = options,
663
.parser = parse_opt_config_file,
664
.args_doc = "",
465
665
.doc = "Mandos plugin runner -- Run plugins" };
466
666
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
469
fprintf(stderr, "Unknown error while parsing arguments\n");
470
exitstatus = EXIT_FAILURE;
471
goto fallback;
472
}
473
474
conffp = fopen(argfile, "r");
667
/* Parse using parse_opt_config_file() in order to get the custom
668
config file location, if any. */
669
ret = argp_parse(&argp, argc, argv,
670
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
671
NULL, NULL);
672
switch(ret){
673
case 0:
674
break;
675
case ENOMEM:
676
default:
677
errno = ret;
678
error(0, errno, "argp_parse");
679
exitstatus = EX_OSERR;
680
goto fallback;
681
case EINVAL:
682
exitstatus = EX_USAGE;
683
goto fallback;
684
}
685
686
/* Reset to the normal argument parser */
687
argp.parser = parse_opt;
688
689
/* Open the configfile if available */
690
if(argfile == NULL){
691
conffp = fopen(AFILE, "r");
692
} else {
693
conffp = fopen(argfile, "r");
694
}
475
695
if(conffp != NULL){
476
696
char *org_line = NULL;
477
697
char *p, *arg, *new_arg, *line;
478
698
size_t size = 0;
479
ssize_t sret;
480
699
const char whitespace_delims[] = " \r\t\f\v\n";
481
700
const char comment_delim[] = "#";
482
701
702
custom_argc = 1;
703
custom_argv = malloc(sizeof(char*) * 2);
704
if(custom_argv == NULL){
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
707
goto fallback;
708
}
709
custom_argv[0] = argv[0];
710
custom_argv[1] = NULL;
711
712
/* for each line in the config file, strip whitespace and ignore
713
commented text */
483
714
while(true){
484
715
sret = getline(&org_line, &size, conffp);
485
716
if(sret == -1){
486
717
break;
487
718
}
488
719
489
720
line = org_line;
490
721
arg = strsep(&line, comment_delim);
491
722
while((p = strsep(&arg, whitespace_delims)) != NULL){
493
724
continue;
494
725
}
495
726
new_arg = strdup(p);
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
727
if(new_arg == NULL){
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
730
free(org_line);
500
731
goto fallback;
501
732
}
733
734
custom_argc += 1;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv,
738
(size_t)custom_argc + 1,
739
sizeof(char *));
740
#else
741
char **new_argv = NULL;
742
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
743
/* overflow */
744
errno = ENOMEM;
745
} else {
746
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
747
* sizeof(char *));
748
}
749
#endif
750
if(new_argv == NULL){
751
error(0, errno, "reallocarray");
752
exitstatus = EX_OSERR;
753
free(new_arg);
754
free(org_line);
755
goto fallback;
756
} else {
757
custom_argv = new_argv;
758
}
759
}
760
custom_argv[custom_argc-1] = new_arg;
761
custom_argv[custom_argc] = NULL;
502
762
}
503
763
}
764
do {
765
ret = fclose(conffp);
766
} while(ret == EOF and errno == EINTR);
767
if(ret == EOF){
768
error(0, errno, "fclose");
769
exitstatus = EX_IOERR;
770
goto fallback;
771
}
504
772
free(org_line);
505
} else{
773
} else {
506
774
/* Check for harmful errors and go to fallback. Other errors might
507
775
not affect opening plugins */
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
509
perror("fopen");
510
exitstatus = EXIT_FAILURE;
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
511
779
goto fallback;
512
780
}
513
781
}
514
782
/* If there were any arguments from the configuration file, pass
783
them to parser as command line arguments */
515
784
if(custom_argv != NULL){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
518
&plugin_list);
519
if (ret == ARGP_ERR_UNKNOWN){
520
fprintf(stderr, "Unknown error while parsing arguments\n");
521
exitstatus = EXIT_FAILURE;
522
goto fallback;
785
ret = argp_parse(&argp, custom_argc, custom_argv,
786
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
787
NULL, NULL);
788
switch(ret){
789
case 0:
790
break;
791
case ENOMEM:
792
default:
793
errno = ret;
794
error(0, errno, "argp_parse");
795
exitstatus = EX_OSERR;
796
goto fallback;
797
case EINVAL:
798
exitstatus = EX_CONFIG;
799
goto fallback;
800
}
801
}
802
803
/* Parse actual command line arguments, to let them override the
804
config file */
805
ret = argp_parse(&argp, argc, argv,
806
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
807
NULL, NULL);
808
switch(ret){
809
case 0:
810
break;
811
case ENOMEM:
812
default:
813
errno = ret;
814
error(0, errno, "argp_parse");
815
exitstatus = EX_OSERR;
816
goto fallback;
817
case EINVAL:
818
exitstatus = EX_USAGE;
819
goto fallback;
820
}
821
822
{
823
char *pluginhelperenv;
824
bool bret = true;
825
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
826
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
827
if(ret != -1){
828
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
829
}
830
if(ret == -1 or not bret){
831
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
832
" environment variable to \"%s\" for all plugins\n",
833
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
834
}
835
if(ret != -1){
836
free(pluginhelperenv);
523
837
}
524
838
}
525
839
526
840
if(debug){
527
for(plugin *p = plugin_list; p != NULL; p=p->next){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
528
842
fprintf(stderr, "Plugin: %s has %d arguments\n",
529
843
p->name ? p->name : "Global", p->argc - 1);
530
844
for(char **a = p->argv; *a != NULL; a++){
531
845
fprintf(stderr, "\tArg: %s\n", *a);
532
846
}
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
847
fprintf(stderr, "...and %d environment variables\n", p->envc);
534
848
for(char **a = p->environ; *a != NULL; a++){
535
849
fprintf(stderr, "\t%s\n", *a);
536
850
}
537
851
}
538
852
}
539
853
854
if(getuid() == 0){
855
/* Work around Debian bug #633582:
856
<https://bugs.debian.org/633582> */
857
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
858
if(plugindir_fd == -1){
859
if(errno != ENOENT){
860
error(0, errno, "open(\"" PDIR "\")");
861
}
862
} else {
863
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
864
if(ret == -1){
865
error(0, errno, "fstat");
866
} else {
867
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
868
ret = fchown(plugindir_fd, uid, gid);
869
if(ret == -1){
870
error(0, errno, "fchown");
871
}
872
}
873
}
874
close(plugindir_fd);
875
}
876
877
/* Work around Debian bug #981302
878
<https://bugs.debian.org/981302> */
879
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
880
ret = symlink("/proc/self/fd", "/dev/fd");
881
if(ret == -1){
882
error(0, errno, "Failed to create /dev/fd symlink");
883
}
884
}
885
}
886
887
/* Lower permissions */
888
ret = setgid(gid);
889
if(ret == -1){
890
error(0, errno, "setgid");
891
}
540
892
ret = setuid(uid);
541
if (ret == -1){
542
perror("setuid");
543
}
544
545
setgid(gid);
546
if (ret == -1){
547
perror("setgid");
548
}
549
550
dir = opendir(plugindir);
551
if(dir == NULL){
552
perror("Could not open plugin dir");
553
exitstatus = EXIT_FAILURE;
554
goto fallback;
555
}
556
557
/* Set the FD_CLOEXEC flag on the directory, if possible */
893
if(ret == -1){
894
error(0, errno, "setuid");
895
}
896
897
/* Open plugin directory with close_on_exec flag */
558
898
{
559
int dir_fd = dirfd(dir);
560
if(dir_fd >= 0){
561
ret = set_cloexec_flag(dir_fd);
562
if(ret < 0){
563
perror("set_cloexec_flag");
564
exitstatus = EXIT_FAILURE;
565
goto fallback;
899
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
900
#ifdef O_CLOEXEC
901
O_CLOEXEC
902
#else /* not O_CLOEXEC */
903
0
904
#endif /* not O_CLOEXEC */
905
);
906
if(dir_fd == -1){
907
error(0, errno, "Could not open plugin dir");
908
exitstatus = EX_UNAVAILABLE;
909
goto fallback;
910
}
911
912
#ifndef O_CLOEXEC
913
/* Set the FD_CLOEXEC flag on the directory */
914
ret = set_cloexec_flag(dir_fd);
915
if(ret < 0){
916
error(0, errno, "set_cloexec_flag");
917
exitstatus = EX_OSERR;
918
goto fallback;
919
}
920
#endif /* O_CLOEXEC */
921
}
922
923
int good_name(const struct dirent * const dirent){
924
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
925
"*.dpkg-old", "*.dpkg-bak",
926
"*.dpkg-divert", NULL };
927
#ifdef __GNUC__
928
#pragma GCC diagnostic push
929
#pragma GCC diagnostic ignored "-Wcast-qual"
930
#endif
931
for(const char **pat = (const char **)patterns;
932
*pat != NULL; pat++){
933
#ifdef __GNUC__
934
#pragma GCC diagnostic pop
935
#endif
936
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
937
!= FNM_NOMATCH){
938
if(debug){
939
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
940
" matching pattern %s\n", dirent->d_name, *pat);
941
}
942
return 0;
566
943
}
567
944
}
945
return 1;
946
}
947
948
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
949
alphasort);
950
if(numplugins == -1){
951
error(0, errno, "Could not scan plugin dir");
952
direntries = NULL;
953
exitstatus = EX_OSERR;
954
goto fallback;
568
955
}
569
956
570
957
FD_ZERO(&rfds_all);
571
958
572
while(true){
573
dirst = readdir(dir);
574
575
// All directory entries have been processed
576
if(dirst == NULL){
577
if (errno == EBADF){
578
perror("readdir");
579
exitstatus = EXIT_FAILURE;
580
goto fallback;
581
}
582
break;
583
}
584
585
d_name_len = strlen(dirst->d_name);
586
587
// Ignore dotfiles, backup files and other junk
588
{
589
bool bad_name = false;
590
591
const char const *bad_prefixes[] = { ".", "#", NULL };
592
593
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
594
".dpkg-old",
595
".dpkg-divert", NULL };
596
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
597
size_t pre_len = strlen(*pre);
598
if((d_name_len >= pre_len)
599
and strncmp((dirst->d_name), *pre, pre_len) == 0){
600
if(debug){
601
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
602
" with bad prefix %s\n", dirst->d_name, *pre);
603
}
604
bad_name = true;
605
break;
606
}
607
}
608
609
if(bad_name){
610
continue;
611
}
612
613
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
614
size_t suf_len = strlen(*suf);
615
if((d_name_len >= suf_len)
616
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
617
== 0)){
618
if(debug){
619
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
620
" with bad suffix %s\n", dirst->d_name, *suf);
621
}
622
bad_name = true;
623
break;
624
}
625
}
626
627
if(bad_name){
628
continue;
629
}
630
}
631
632
char *filename;
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
634
if(ret < 0){
635
perror("asprintf");
636
continue;
637
}
638
639
ret = stat(filename, &st);
640
if (ret == -1){
641
perror("stat");
642
free(filename);
643
continue;
644
}
645
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
959
/* Read and execute any executable in the plugin directory*/
960
for(int i = 0; i < numplugins; i++){
961
962
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
963
if(plugin_fd == -1){
964
error(0, errno, "Could not open plugin");
965
free(direntries[i]);
966
continue;
967
}
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
969
if(ret == -1){
970
error(0, errno, "stat");
971
close(plugin_fd);
972
free(direntries[i]);
973
continue;
974
}
975
976
/* Ignore non-executable files */
977
if(not S_ISREG(st.st_mode)
978
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
979
X_OK, 0)) != 0)){
647
980
if(debug){
648
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
649
" with bad type or mode\n", filename);
981
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
982
" with bad type or mode\n",
983
plugindir != NULL ? plugindir : PDIR,
984
direntries[i]->d_name);
650
985
}
651
free(filename);
986
close(plugin_fd);
987
free(direntries[i]);
652
988
continue;
653
989
}
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
990
991
plugin *p = getplugin(direntries[i]->d_name);
655
992
if(p == NULL){
656
perror("getplugin");
657
free(filename);
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
658
996
continue;
659
997
}
660
998
if(p->disabled){
661
999
if(debug){
662
1000
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
663
dirst->d_name);
1001
direntries[i]->d_name);
664
1002
}
665
free(filename);
1003
close(plugin_fd);
1004
free(direntries[i]);
666
1005
continue;
667
1006
}
668
1007
{
669
1008
/* Add global arguments to argument list for this plugin */
670
plugin *g = getplugin(NULL, &plugin_list);
1009
plugin *g = getplugin(NULL);
671
1010
if(g != NULL){
672
1011
for(char **a = g->argv + 1; *a != NULL; a++){
673
1012
if(not add_argument(p, *a)){
674
perror("add_argument");
1013
error(0, errno, "add_argument");
675
1014
}
676
1015
}
677
1016
/* Add global environment variables */
678
1017
for(char **e = g->environ; *e != NULL; e++){
679
if(not add_environment(p, *e)){
680
perror("add_environment");
1018
if(not add_environment(p, *e, false)){
1019
error(0, errno, "add_environment");
681
1020
}
682
1021
}
683
1022
}
684
1023
}
685
/* If this plugin has any environment variables, we will call
686
using execve and need to duplicate the environment from this
687
process, too. */
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
688
1026
if(p->environ[0] != NULL){
689
1027
for(char **e = environ; *e != NULL; e++){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
696
perror("add_environment");
1028
if(not add_environment(p, *e, false)){
1029
error(0, errno, "add_environment");
697
1030
}
698
1031
}
699
1032
}
700
1033
701
1034
int pipefd[2];
702
ret = pipe(pipefd);
703
if (ret == -1){
704
perror("pipe");
705
exitstatus = EXIT_FAILURE;
706
goto fallback;
707
}
1035
#ifndef O_CLOEXEC
1036
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1037
#else /* O_CLOEXEC */
1038
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1039
#endif /* O_CLOEXEC */
1040
if(ret == -1){
1041
error(0, errno, "pipe");
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
1044
goto fallback;
1045
}
1046
if(pipefd[0] >= FD_SETSIZE){
1047
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1048
FD_SETSIZE);
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
1053
goto fallback;
1054
}
1055
#ifndef O_CLOEXEC
1056
/* Ask OS to automatic close the pipe on exec */
708
1057
ret = set_cloexec_flag(pipefd[0]);
709
1058
if(ret < 0){
710
perror("set_cloexec_flag");
711
exitstatus = EXIT_FAILURE;
1059
error(0, errno, "set_cloexec_flag");
1060
close(pipefd[0]);
1061
close(pipefd[1]);
1062
exitstatus = EX_OSERR;
1063
free(direntries[i]);
712
1064
goto fallback;
713
1065
}
714
1066
ret = set_cloexec_flag(pipefd[1]);
715
1067
if(ret < 0){
716
perror("set_cloexec_flag");
717
exitstatus = EXIT_FAILURE;
1068
error(0, errno, "set_cloexec_flag");
1069
close(pipefd[0]);
1070
close(pipefd[1]);
1071
exitstatus = EX_OSERR;
1072
free(direntries[i]);
718
1073
goto fallback;
719
1074
}
1075
#endif /* not O_CLOEXEC */
720
1076
/* Block SIGCHLD until process is safely in process list */
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1077
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1078
&sigchld_action.sa_mask,
1079
NULL));
722
1080
if(ret < 0){
723
perror("sigprocmask");
724
exitstatus = EXIT_FAILURE;
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
725
1084
goto fallback;
726
1085
}
727
// Starting a new process to be watched
728
pid_t pid = fork();
1086
/* Starting a new process to be watched */
1087
pid_t pid;
1088
do {
1089
pid = fork();
1090
} while(pid == -1 and errno == EINTR);
729
1091
if(pid == -1){
730
perror("fork");
731
exitstatus = EXIT_FAILURE;
1092
error(0, errno, "fork");
1093
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1094
&sigchld_action.sa_mask, NULL));
1095
close(pipefd[0]);
1096
close(pipefd[1]);
1097
exitstatus = EX_OSERR;
1098
free(direntries[i]);
732
1099
goto fallback;
733
1100
}
734
1101
if(pid == 0){
735
1102
/* this is the child process */
736
1103
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
737
1104
if(ret < 0){
738
perror("sigaction");
739
_exit(EXIT_FAILURE);
1105
error(0, errno, "sigaction");
1106
_exit(EX_OSERR);
740
1107
}
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1108
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
742
1109
if(ret < 0){
743
perror("sigprocmask");
744
_exit(EXIT_FAILURE);
1110
error(0, errno, "sigprocmask");
1111
_exit(EX_OSERR);
745
1112
}
746
1113
747
1114
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
748
1115
if(ret == -1){
749
perror("dup2");
750
_exit(EXIT_FAILURE);
1116
error(0, errno, "dup2");
1117
_exit(EX_OSERR);
751
1118
}
752
1119
753
if(dirfd(dir) < 0){
754
/* If dir has no file descriptor, we could not set FD_CLOEXEC
755
above and must now close it manually here. */
756
closedir(dir);
757
}
758
if(p->environ[0] == NULL){
759
if(execv(filename, p->argv) < 0){
760
perror("execv");
761
_exit(EXIT_FAILURE);
762
}
763
} else {
764
if(execve(filename, p->argv, p->environ) < 0){
765
perror("execve");
766
_exit(EXIT_FAILURE);
767
}
1120
if(fexecve(plugin_fd, p->argv,
1121
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1122
error(0, errno, "fexecve for %s/%s",
1123
plugindir != NULL ? plugindir : PDIR,
1124
direntries[i]->d_name);
1125
_exit(EX_OSERR);
768
1126
}
769
1127
/* no return */
770
1128
}
771
/* parent process */
772
free(filename);
773
close(pipefd[1]); /* close unused write end of pipe */
774
process *new_process = malloc(sizeof(process));
775
if (new_process == NULL){
776
perror("malloc");
777
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1129
/* Parent process */
1130
close(pipefd[1]); /* Close unused write end of pipe */
1131
close(plugin_fd);
1132
plugin *new_plugin = getplugin(direntries[i]->d_name);
1133
if(new_plugin == NULL){
1134
error(0, errno, "getplugin");
1135
ret = (int)(TEMP_FAILURE_RETRY
1136
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1137
NULL)));
778
1138
if(ret < 0){
779
perror("sigprocmask");
1139
error(0, errno, "sigprocmask");
780
1140
}
781
exitstatus = EXIT_FAILURE;
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
782
1143
goto fallback;
783
1144
}
1145
free(direntries[i]);
784
1146
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
1147
new_plugin->pid = pid;
1148
new_plugin->fd = pipefd[0];
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
790
1155
/* Unblock SIGCHLD so signal handler can be run if this process
791
1156
has already completed */
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1157
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1158
&sigchld_action.sa_mask,
1159
NULL));
793
1160
if(ret < 0){
794
perror("sigprocmask");
795
exitstatus = EXIT_FAILURE;
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
796
1163
goto fallback;
797
1164
}
798
1165
799
FD_SET(new_process->fd, &rfds_all);
800
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
803
}
804
805
}
806
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
810
closedir(dir);
811
dir = NULL;
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
817
}
818
while(process_list){
1166
FD_SET(new_plugin->fd, &rfds_all);
1167
1168
if(maxfd < new_plugin->fd){
1169
maxfd = new_plugin->fd;
1170
}
1171
}
1172
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1177
free_plugin(getplugin(NULL));
1178
1179
for(plugin *p = plugin_list; p != NULL; p = p->next){
1180
if(p->pid != 0){
1181
break;
1182
}
1183
if(p->next == NULL){
1184
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1185
" directory?\n");
1186
free_plugin_list();
1187
}
1188
}
1189
1190
/* Main loop while running plugins exist */
1191
while(plugin_list){
819
1192
fd_set rfds = rfds_all;
820
1193
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
821
if (select_ret == -1){
822
perror("select");
823
exitstatus = EXIT_FAILURE;
1194
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
824
1197
goto fallback;
825
1198
}
826
1199
/* OK, now either a process completed, or something can be read
827
1200
from one of them */
828
for(process *proc = process_list; proc ; proc = proc->next){
1201
for(plugin *proc = plugin_list; proc != NULL;){
829
1202
/* Is this process completely done? */
830
if(proc->eof and proc->completed){
1203
if(proc->completed and proc->eof){
831
1204
/* Only accept the plugin output if it exited cleanly */
832
1205
if(not WIFEXITED(proc->status)
833
1206
or WEXITSTATUS(proc->status) != 0){
834
1207
/* Bad exit by plugin */
1208
835
1209
if(debug){
836
1210
if(WIFEXITED(proc->status)){
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
1211
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1212
" status %d\n", proc->name,
1213
(intmax_t) (proc->pid),
839
1214
WEXITSTATUS(proc->status));
840
} else if(WIFSIGNALED(proc->status)) {
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
843
WTERMSIG(proc->status));
844
} else if(WCOREDUMP(proc->status)){
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
1215
} else if(WIFSIGNALED(proc->status)){
1216
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1217
" signal %d: %s\n", proc->name,
1218
(intmax_t) (proc->pid),
1219
WTERMSIG(proc->status),
1220
strsignal(WTERMSIG(proc->status)));
847
1221
}
848
1222
}
1223
849
1224
/* Remove the plugin */
850
1225
FD_CLR(proc->fd, &rfds_all);
1226
851
1227
/* Block signal while modifying process_list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1228
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1229
(SIG_BLOCK,
1230
&sigchld_action.sa_mask,
1231
NULL));
853
1232
if(ret < 0){
854
perror("sigprocmask");
855
exitstatus = EXIT_FAILURE;
1233
error(0, errno, "sigprocmask");
1234
exitstatus = EX_OSERR;
856
1235
goto fallback;
857
1236
}
858
/* Delete this process entry from the list */
859
if(process_list == proc){
860
/* First one - simple */
861
process_list = proc->next;
862
} else {
863
/* Second one or later */
864
for(process *p = process_list; p != NULL; p = p->next){
865
if(p->next == proc){
866
p->next = proc->next;
867
break;
868
}
869
}
870
}
1237
1238
plugin *next_plugin = proc->next;
1239
free_plugin(proc);
1240
proc = next_plugin;
1241
871
1242
/* We are done modifying process list, so unblock signal */
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
1243
ret = (int)(TEMP_FAILURE_RETRY
1244
(sigprocmask(SIG_UNBLOCK,
1245
&sigchld_action.sa_mask, NULL)));
874
1246
if(ret < 0){
875
perror("sigprocmask");
876
}
877
free(proc->buffer);
878
free(proc);
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
881
the process list */
882
break;
1247
error(0, errno, "sigprocmask");
1248
exitstatus = EX_OSERR;
1249
goto fallback;
1250
}
1251
1252
if(plugin_list == NULL){
1253
break;
1254
}
1255
1256
continue;
883
1257
}
1258
884
1259
/* This process exited nicely, so print its buffer */
885
1260
886
1261
bool bret = print_out_password(proc->buffer,
887
1262
proc->buffer_length);
888
1263
if(not bret){
889
perror("print_out_password");
890
exitstatus = EXIT_FAILURE;
1264
error(0, errno, "print_out_password");
1265
exitstatus = EX_IOERR;
891
1266
}
892
1267
goto fallback;
893
1268
}
1269
894
1270
/* This process has not completed. Does it have any output? */
895
1271
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
896
1272
/* This process had nothing to say at this time */
1273
proc = proc->next;
897
1274
continue;
898
1275
}
899
1276
/* Before reading, make the process' data buffer large enough */
900
1277
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
901
proc->buffer = realloc(proc->buffer, proc->buffer_size
902
+ (size_t) BUFFER_SIZE);
903
if (proc->buffer == NULL){
904
perror("malloc");
905
exitstatus = EXIT_FAILURE;
1278
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1279
+ (size_t) BUFFER_SIZE);
1280
if(new_buffer == NULL){
1281
error(0, errno, "malloc");
1282
exitstatus = EX_OSERR;
906
1283
goto fallback;
907
1284
}
1285
proc->buffer = new_buffer;
908
1286
proc->buffer_size += BUFFER_SIZE;
909
1287
}
910
1288
/* Read from the process */
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
1289
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1290
proc->buffer
1291
+ proc->buffer_length,
1292
BUFFER_SIZE));
1293
if(sret < 0){
914
1294
/* Read error from this process; ignore the error */
1295
proc = proc->next;
915
1296
continue;
916
1297
}
917
if(ret == 0){
1298
if(sret == 0){
918
1299
/* got EOF */
919
1300
proc->eof = true;
920
1301
} else {
921
proc->buffer_length += (size_t) ret;
1302
proc->buffer_length += (size_t) sret;
922
1303
}
923
1304
}
924
1305
}
925
926
1306
1307
927
1308
fallback:
928
1309
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1310
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1311
and exitstatus != EX_OK)){
930
1312
/* Fallback if all plugins failed, none are found or an error
931
1313
occured */
932
1314
bool bret;
933
1315
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
934
1316
char *passwordbuffer = getpass("Password: ");
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1317
size_t len = strlen(passwordbuffer);
1318
/* Strip trailing newline */
1319
if(len > 0 and passwordbuffer[len-1] == '\n'){
1320
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1321
len--;
1322
}
1323
bret = print_out_password(passwordbuffer, len);
936
1324
if(not bret){
937
perror("print_out_password");
938
exitstatus = EXIT_FAILURE;
1325
error(0, errno, "print_out_password");
1326
exitstatus = EX_IOERR;
939
1327
}
940
1328
}
941
1329
942
1330
/* Restore old signal handler */
943
1331
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
944
1332
if(ret == -1){
945
perror("sigaction");
946
exitstatus = EXIT_FAILURE;
1333
error(0, errno, "sigaction");
1334
exitstatus = EX_OSERR;
947
1335
}
948
1336
949
1337
if(custom_argv != NULL){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1338
for(char **arg = custom_argv+1; *arg != NULL; arg++){
951
1339
free(*arg);
952
1340
}
953
1341
free(custom_argv);
954
1342
}
955
free_plugin_list(plugin_list);
956
957
if(dir != NULL){
958
closedir(dir);
1343
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
959
1348
}
960
1349
961
/* Free the process list and kill the processes */
962
for(process *next; process_list != NULL; process_list = next){
963
next = process_list->next;
964
close(process_list->fd);
965
ret = kill(process_list->pid, SIGTERM);
966
if(ret == -1 and errno != ESRCH){
967
/* set-uid proccesses migth not get closed */
968
perror("kill");
1350
/* Kill the processes */
1351
for(plugin *p = plugin_list; p != NULL; p = p->next){
1352
if(p->pid != 0){
1353
close(p->fd);
1354
ret = kill(p->pid, SIGTERM);
1355
if(ret == -1 and errno != ESRCH){
1356
/* Set-uid proccesses might not get closed */
1357
error(0, errno, "kill");
1358
}
969
1359
}
970
free(process_list->buffer);
971
free(process_list);
972
1360
}
973
1361
974
1362
/* Wait for any remaining child processes to terminate */
975
do{
1363
do {
976
1364
ret = wait(NULL);
977
1365
} while(ret >= 0);
978
1366
if(errno != ECHILD){
979
perror("wait");
1367
error(0, errno, "wait");
980
1368
}
981
1369
1370
free_plugin_list();
1371
1372
free(plugindir);
1373
free(pluginhelperdir);
1374
free(argfile);
1375
982
1376
return exitstatus;
983
1377
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0