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- Committer: Teddy Hogeborn
- Date: 2024-09-09 04:24:39 UTC
- Revision ID: teddy@recompile.se-20240909042439-j85mr20uli2hnyis
Eliminate compiler warnings
Many programs use nested functions, which now result in a linker
warning about executable stack. Hide this warning. Also, rewrite a
loop in the plymouth plugin to avoid warning about signed overflow.
This change also makes the plugin pick the alphabetically first
process entry instead of the last, in case many plymouth processes are
found (which should be unlikely).
* Makefile (plugin-runner, dracut-module/password-agent,
plugins.d/password-prompt, plugins.d/mandos-client,
plugins.d/plymouth): New target; set LDFLAGS to add "-Xlinker
--no-warn-execstack".
* plugins.d/plymouth.c (get_pid): When no pid files are found, and we
are looking through the process list, go though it from the start
instead of from the end, i.e. in normal alphabetical order and not
in reverse order.
Many programs use nested functions, which now result in a linker
warning about executable stack. Hide this warning. Also, rewrite a
loop in the plymouth plugin to avoid warning about signed overflow.
This change also makes the plugin pick the alphabetically first
process entry instead of the last, in case many plymouth processes are
found (which should be unlikely).
* Makefile (plugin-runner, dracut-module/password-agent,
plugins.d/password-prompt, plugins.d/mandos-client,
plugins.d/plymouth): New target; set LDFLAGS to add "-Xlinker
--no-warn-execstack".
* plugins.d/plymouth.c (get_pid): When no pid files are found, and we
are looking through the process list, go though it from the start
instead of from the end, i.e. in normal alphabetical order and not
in reverse order.
- 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, error_t */
60
#include <signal.h> /* struct sigaction, sigemptyset(),
61
sigaddset(), sigaction(),
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
63
SIG_UNBLOCK, kill() */
64
#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 */
65
89
66
90
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} 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>";
85
98
86
99
typedef struct plugin{
87
100
char *name; /* can be NULL or any plugin name */
90
103
char **environ;
91
104
int envc;
92
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;
93
116
struct plugin *next;
94
117
} plugin;
95
118
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
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))){
100
129
return p;
101
130
}
102
131
}
103
132
/* Create a new plugin */
104
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
106
return NULL;
107
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
111
}
112
113
*new_plugin = (plugin) { .name = copy_name,
114
.argc = 1,
115
.envc = 0,
116
.disabled = false,
117
.next = *plugin_list };
118
119
new_plugin->argv = malloc(sizeof(char *) * 2);
120
if (new_plugin->argv == 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){
138
return NULL;
139
}
140
char *copy_name = NULL;
141
if(name != NULL){
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
145
if(copy_name == NULL){
146
int e = errno;
147
free(new_plugin);
148
errno = e;
149
return NULL;
150
}
151
}
152
153
*new_plugin = (plugin){ .name = copy_name,
154
.argc = 1,
155
.disabled = false,
156
.next = plugin_list };
157
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;
163
free(copy_name);
121
164
free(new_plugin);
165
errno = e;
122
166
return NULL;
123
167
}
124
168
new_plugin->argv[0] = copy_name;
125
169
new_plugin->argv[1] = NULL;
126
127
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);
128
174
if(new_plugin->environ == NULL){
175
int e = errno;
176
free(copy_name);
129
177
free(new_plugin->argv);
130
178
free(new_plugin);
179
errno = e;
131
180
return NULL;
132
181
}
133
182
new_plugin->environ[0] = NULL;
183
134
184
/* Append the new plugin to the list */
135
*plugin_list = new_plugin;
185
plugin_list = new_plugin;
136
186
return new_plugin;
137
187
}
138
188
139
189
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
140
191
static bool add_to_char_array(const char *new, char ***array,
141
192
int *len){
142
193
/* Resize the pointed-to array to hold one more pointer */
143
*array = realloc(*array, sizeof(char *)
144
* (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);
145
210
/* Malloc check */
146
if(*array == NULL){
211
if(new_array == NULL){
147
212
return false;
148
213
}
214
*array = new_array;
149
215
/* Make a copy of the new string */
150
char *copy = strdup(new);
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
151
220
if(copy == NULL){
152
221
return false;
153
222
}
160
229
}
161
230
162
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
163
233
static bool add_argument(plugin *p, const char *arg){
164
234
if(p == NULL){
165
235
return false;
168
238
}
169
239
170
240
/* Add to a plugin's environment */
171
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){
172
243
if(p == NULL){
173
244
return false;
174
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
}
175
266
return add_to_char_array(def, &(p->environ), &(p->envc));
176
267
}
177
268
178
269
#ifndef O_CLOEXEC
179
270
/*
180
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
181
272
* Descriptor Flags".
182
* *Note File Descriptor Flags:(libc)Descriptor Flags.
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
183
274
*/
184
static int set_cloexec_flag(int fd)
185
{
186
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));
187
278
/* If reading the flags failed, return error indication now. */
188
279
if(ret < 0){
189
280
return ret;
190
281
}
191
282
/* Store modified flag word in the descriptor. */
192
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
193
285
}
194
195
process *process_list = NULL;
196
197
/* Mark a process as completed when it exits, and save its exit
286
#endif /* not O_CLOEXEC */
287
288
289
/* Mark processes as completed when they exit, and save their exit
198
290
status. */
199
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
201
int status;
202
pid_t pid = wait(&status);
203
if(pid == -1){
204
perror("wait");
205
return;
206
}
207
while(proc != NULL and proc->pid != pid){
208
proc = proc->next;
209
}
210
if(proc == NULL){
211
/* Process not found in process list */
212
return;
213
}
214
proc->status = status;
215
proc->completed = true;
291
static void handle_sigchld(__attribute__((unused)) int sig){
292
int old_errno = errno;
293
while(true){
294
plugin *proc = plugin_list;
295
int status;
296
pid_t pid = waitpid(-1, &status, WNOHANG);
297
if(pid == 0){
298
/* Only still running child processes */
299
break;
300
}
301
if(pid == -1){
302
if(errno == ECHILD){
303
/* No child processes */
304
break;
305
}
306
error(0, errno, "waitpid");
307
}
308
309
/* A child exited, find it in process_list */
310
while(proc != NULL and proc->pid != pid){
311
proc = proc->next;
312
}
313
if(proc == NULL){
314
/* Process not found in process list */
315
continue;
316
}
317
proc->status = status;
318
proc->completed = 1;
319
}
320
errno = old_errno;
216
321
}
217
322
218
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){
219
326
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
223
327
for(size_t written = 0; written < length; written += (size_t)ret){
224
328
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
225
329
length - written));
230
334
return true;
231
335
}
232
336
233
char **add_to_argv(char **argv, int *argc, char *arg){
234
if (argv == NULL){
235
*argc = 1;
236
argv = malloc(sizeof(char*) * 2);
237
if(argv == NULL){
238
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
}
239
363
}
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
241
argv[1] = NULL;
242
}
243
*argc += 1;
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
246
if(argv == NULL){
247
return NULL;
248
}
249
argv[*argc-1] = arg;
250
argv[*argc] = NULL;
251
return argv;
364
}
365
366
free(plugin_node);
252
367
}
253
368
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
259
free(*arg);
260
}
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
263
free(*env);
264
}
265
free(plugin_list->environ);
266
free(plugin_list);
267
}
369
static void free_plugin_list(void){
370
while(plugin_list != NULL){
371
free_plugin(plugin_list);
372
}
268
373
}
269
374
270
375
int main(int argc, char *argv[]){
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
378
char *argfile = NULL;
273
379
FILE *conffp;
274
size_t d_name_len;
275
DIR *dir = NULL;
276
struct dirent *dirst;
380
struct dirent **direntries = NULL;
277
381
struct stat st;
278
382
fd_set rfds_all;
279
383
int ret, maxfd = 0;
384
ssize_t sret;
280
385
uid_t uid = 65534;
281
386
gid_t gid = 65534;
282
387
bool debug = false;
286
391
.sa_flags = SA_NOCLDSTOP };
287
392
char **custom_argv = NULL;
288
393
int custom_argc = 0;
394
int dir_fd = -1;
289
395
290
396
/* Establish a signal handler */
291
397
sigemptyset(&sigchld_action.sa_mask);
292
398
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
293
399
if(ret == -1){
294
perror("sigaddset");
295
exitstatus = EXIT_FAILURE;
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
296
402
goto fallback;
297
403
}
298
404
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
299
405
if(ret == -1){
300
perror("sigaction");
301
exitstatus = EXIT_FAILURE;
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
302
408
goto fallback;
303
409
}
304
410
307
413
{ .name = "global-options", .key = 'g',
308
414
.arg = "OPTION[,OPTION[,...]]",
309
415
.doc = "Options passed to all plugins" },
310
{ .name = "global-envs", .key = 'e',
416
{ .name = "global-env", .key = 'G',
311
417
.arg = "VAR=value",
312
418
.doc = "Environment variable passed to all plugins" },
313
419
{ .name = "options-for", .key = 'o',
314
420
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
315
421
.doc = "Options passed only to specified plugin" },
316
{ .name = "envs-for", .key = 'f',
422
{ .name = "env-for", .key = 'E',
317
423
.arg = "PLUGIN:ENV=value",
318
424
.doc = "Environment variable passed to specified plugin" },
319
425
{ .name = "disable", .key = 'd',
320
426
.arg = "PLUGIN",
321
427
.doc = "Disable a specific plugin", .group = 1 },
428
{ .name = "enable", .key = 'e',
429
.arg = "PLUGIN",
430
.doc = "Enable a specific plugin", .group = 1 },
322
431
{ .name = "plugin-dir", .key = 128,
323
432
.arg = "DIRECTORY",
324
433
.doc = "Specify a different plugin directory", .group = 2 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.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 },
333
458
{ .name = NULL }
334
459
};
335
460
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
343
char *p;
344
while((p = strsep(&arg, ",")) != NULL){
345
if(p[0] == '\0'){
346
continue;
347
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
349
perror("add_argument");
350
return ARGP_ERR_UNKNOWN;
351
}
352
}
353
}
354
break;
355
case 'e':
356
if(arg == NULL){
357
break;
358
}
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
367
}
368
break;
369
case 'o':
370
if (arg != NULL){
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
373
break;
374
}
375
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
377
break;
378
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
389
}
390
}
391
}
392
break;
393
case 'f':
394
if(arg == NULL){
395
break;
396
}
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 */
397
508
{
398
509
char *envdef = strchr(arg, ':');
399
510
if(envdef == NULL){
400
break;
401
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
513
break;
514
}
515
*envdef = '\0';
406
516
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
408
perror("add_environment");
409
}
410
}
411
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
415
if(p == NULL){
416
return ARGP_ERR_UNKNOWN;
417
}
418
p->disabled = true;
419
}
420
break;
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
425
uid = (uid_t)strtol(arg, NULL, 10);
426
break;
427
case 130:
428
gid = (gid_t)strtol(arg, NULL, 10);
429
break;
430
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 */
431
578
debug = true;
432
579
break;
433
case ARGP_KEY_ARG:
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
435
break;
436
case ARGP_KEY_END:
437
break;
438
default:
439
return ARGP_ERR_UNKNOWN;
440
}
441
return 0;
442
}
443
444
plugin *plugin_list = NULL;
445
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.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 = "",
448
665
.doc = "Mandos plugin runner -- Run plugins" };
449
666
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
451
if (ret == ARGP_ERR_UNKNOWN){
452
fprintf(stderr, "Unknown error while parsing arguments\n");
453
exitstatus = EXIT_FAILURE;
454
goto fallback;
455
}
456
457
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
}
458
695
if(conffp != NULL){
459
696
char *org_line = NULL;
460
697
char *p, *arg, *new_arg, *line;
461
698
size_t size = 0;
462
ssize_t sret;
463
699
const char whitespace_delims[] = " \r\t\f\v\n";
464
700
const char comment_delim[] = "#";
465
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 */
466
714
while(true){
467
715
sret = getline(&org_line, &size, conffp);
468
716
if(sret == -1){
469
717
break;
470
718
}
471
719
472
720
line = org_line;
473
721
arg = strsep(&line, comment_delim);
474
722
while((p = strsep(&arg, whitespace_delims)) != NULL){
476
724
continue;
477
725
}
478
726
new_arg = strdup(p);
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
727
if(new_arg == NULL){
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
730
free(org_line);
483
731
goto fallback;
484
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;
485
762
}
486
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
}
487
772
free(org_line);
488
} else{
773
} else {
489
774
/* Check for harmful errors and go to fallback. Other errors might
490
775
not affect opening plugins */
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
492
perror("fopen");
493
exitstatus = EXIT_FAILURE;
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
494
779
goto fallback;
495
780
}
496
781
}
497
782
/* If there were any arguments from the configuration file, pass
783
them to parser as command line arguments */
498
784
if(custom_argv != NULL){
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
501
if (ret == ARGP_ERR_UNKNOWN){
502
fprintf(stderr, "Unknown error while parsing arguments\n");
503
exitstatus = EXIT_FAILURE;
504
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);
505
837
}
506
838
}
507
839
508
840
if(debug){
509
for(plugin *p = plugin_list; p != NULL; p=p->next){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
510
842
fprintf(stderr, "Plugin: %s has %d arguments\n",
511
843
p->name ? p->name : "Global", p->argc - 1);
512
844
for(char **a = p->argv; *a != NULL; a++){
513
845
fprintf(stderr, "\tArg: %s\n", *a);
514
846
}
515
fprintf(stderr, "...and %u environment variables\n", p->envc);
847
fprintf(stderr, "...and %d environment variables\n", p->envc);
516
848
for(char **a = p->environ; *a != NULL; a++){
517
849
fprintf(stderr, "\t%s\n", *a);
518
850
}
519
851
}
520
852
}
521
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
}
522
892
ret = setuid(uid);
523
if (ret == -1){
524
perror("setuid");
525
}
526
527
setgid(gid);
528
if (ret == -1){
529
perror("setgid");
530
}
531
532
dir = opendir(plugindir);
533
if(dir == NULL){
534
perror("Could not open plugin dir");
535
exitstatus = EXIT_FAILURE;
536
goto fallback;
537
}
538
539
/* 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 */
540
898
{
541
int dir_fd = dirfd(dir);
542
if(dir_fd >= 0){
543
ret = set_cloexec_flag(dir_fd);
544
if(ret < 0){
545
perror("set_cloexec_flag");
546
exitstatus = EXIT_FAILURE;
547
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;
548
943
}
549
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;
550
955
}
551
956
552
957
FD_ZERO(&rfds_all);
553
958
554
while(true){
555
dirst = readdir(dir);
556
557
// All directory entries have been processed
558
if(dirst == NULL){
559
if (errno == EBADF){
560
perror("readdir");
561
exitstatus = EXIT_FAILURE;
562
goto fallback;
563
}
564
break;
565
}
566
567
d_name_len = strlen(dirst->d_name);
568
569
// Ignore dotfiles, backup files and other junk
570
{
571
bool bad_name = false;
572
573
const char const *bad_prefixes[] = { ".", "#", NULL };
574
575
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
576
".dpkg-old",
577
".dpkg-divert", NULL };
578
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
579
size_t pre_len = strlen(*pre);
580
if((d_name_len >= pre_len)
581
and strncmp((dirst->d_name), *pre, pre_len) == 0){
582
if(debug){
583
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
584
" with bad prefix %s\n", dirst->d_name, *pre);
585
}
586
bad_name = true;
587
break;
588
}
589
}
590
591
if(bad_name){
592
continue;
593
}
594
595
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
596
size_t suf_len = strlen(*suf);
597
if((d_name_len >= suf_len)
598
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
599
== 0)){
600
if(debug){
601
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
602
" with bad suffix %s\n", dirst->d_name, *suf);
603
}
604
bad_name = true;
605
break;
606
}
607
}
608
609
if(bad_name){
610
continue;
611
}
612
}
613
614
char *filename;
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
616
if(ret < 0){
617
perror("asprintf");
618
continue;
619
}
620
621
ret = stat(filename, &st);
622
if (ret == -1){
623
perror("stat");
624
free(filename);
625
continue;
626
}
627
628
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)){
629
980
if(debug){
630
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
631
" 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);
632
985
}
633
free(filename);
986
close(plugin_fd);
987
free(direntries[i]);
634
988
continue;
635
989
}
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
990
991
plugin *p = getplugin(direntries[i]->d_name);
637
992
if(p == NULL){
638
perror("getplugin");
639
free(filename);
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
640
996
continue;
641
997
}
642
998
if(p->disabled){
643
999
if(debug){
644
1000
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
645
dirst->d_name);
1001
direntries[i]->d_name);
646
1002
}
647
free(filename);
1003
close(plugin_fd);
1004
free(direntries[i]);
648
1005
continue;
649
1006
}
650
1007
{
651
1008
/* Add global arguments to argument list for this plugin */
652
plugin *g = getplugin(NULL, &plugin_list);
1009
plugin *g = getplugin(NULL);
653
1010
if(g != NULL){
654
1011
for(char **a = g->argv + 1; *a != NULL; a++){
655
1012
if(not add_argument(p, *a)){
656
perror("add_argument");
1013
error(0, errno, "add_argument");
657
1014
}
658
1015
}
659
1016
/* Add global environment variables */
660
1017
for(char **e = g->environ; *e != NULL; e++){
661
if(not add_environment(p, *e)){
662
perror("add_environment");
1018
if(not add_environment(p, *e, false)){
1019
error(0, errno, "add_environment");
663
1020
}
664
1021
}
665
1022
}
666
1023
}
667
/* If this plugin has any environment variables, we will call
668
using execve and need to duplicate the environment from this
669
process, too. */
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
670
1026
if(p->environ[0] != NULL){
671
1027
for(char **e = environ; *e != NULL; e++){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
678
perror("add_environment");
1028
if(not add_environment(p, *e, false)){
1029
error(0, errno, "add_environment");
679
1030
}
680
1031
}
681
1032
}
682
1033
683
int pipefd[2];
684
ret = pipe(pipefd);
685
if (ret == -1){
686
perror("pipe");
687
exitstatus = EXIT_FAILURE;
688
goto fallback;
689
}
1034
int pipefd[2];
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 */
690
1057
ret = set_cloexec_flag(pipefd[0]);
691
1058
if(ret < 0){
692
perror("set_cloexec_flag");
693
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]);
694
1064
goto fallback;
695
1065
}
696
1066
ret = set_cloexec_flag(pipefd[1]);
697
1067
if(ret < 0){
698
perror("set_cloexec_flag");
699
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]);
700
1073
goto fallback;
701
1074
}
1075
#endif /* not O_CLOEXEC */
702
1076
/* Block SIGCHLD until process is safely in process list */
703
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));
704
1080
if(ret < 0){
705
perror("sigprocmask");
706
exitstatus = EXIT_FAILURE;
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
707
1084
goto fallback;
708
1085
}
709
// Starting a new process to be watched
710
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);
711
1091
if(pid == -1){
712
perror("fork");
713
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]);
714
1099
goto fallback;
715
1100
}
716
1101
if(pid == 0){
717
1102
/* this is the child process */
718
1103
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
719
1104
if(ret < 0){
720
perror("sigaction");
721
_exit(EXIT_FAILURE);
1105
error(0, errno, "sigaction");
1106
_exit(EX_OSERR);
722
1107
}
723
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1108
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
724
1109
if(ret < 0){
725
perror("sigprocmask");
726
_exit(EXIT_FAILURE);
1110
error(0, errno, "sigprocmask");
1111
_exit(EX_OSERR);
727
1112
}
728
1113
729
1114
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
730
1115
if(ret == -1){
731
perror("dup2");
732
_exit(EXIT_FAILURE);
1116
error(0, errno, "dup2");
1117
_exit(EX_OSERR);
733
1118
}
734
1119
735
if(dirfd(dir) < 0){
736
/* If dir has no file descriptor, we could not set FD_CLOEXEC
737
above and must now close it manually here. */
738
closedir(dir);
739
}
740
if(p->environ[0] == NULL){
741
if(execv(filename, p->argv) < 0){
742
perror("execv");
743
_exit(EXIT_FAILURE);
744
}
745
} else {
746
if(execve(filename, p->argv, p->environ) < 0){
747
perror("execve");
748
_exit(EXIT_FAILURE);
749
}
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);
750
1126
}
751
1127
/* no return */
752
1128
}
753
/* parent process */
754
free(filename);
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
758
perror("malloc");
759
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)));
760
1138
if(ret < 0){
761
perror("sigprocmask");
1139
error(0, errno, "sigprocmask");
762
1140
}
763
exitstatus = EXIT_FAILURE;
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
764
1143
goto fallback;
765
1144
}
1145
free(direntries[i]);
766
1146
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
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
772
1155
/* Unblock SIGCHLD so signal handler can be run if this process
773
1156
has already completed */
774
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));
775
1160
if(ret < 0){
776
perror("sigprocmask");
777
exitstatus = EXIT_FAILURE;
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
778
1163
goto fallback;
779
1164
}
780
1165
781
FD_SET(new_process->fd, &rfds_all);
782
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
785
}
786
787
}
788
789
free_plugin_list(plugin_list);
790
791
closedir(dir);
792
dir = NULL;
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
798
}
799
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){
800
1192
fd_set rfds = rfds_all;
801
1193
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
802
if (select_ret == -1){
803
perror("select");
804
exitstatus = EXIT_FAILURE;
1194
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
805
1197
goto fallback;
806
1198
}
807
1199
/* OK, now either a process completed, or something can be read
808
1200
from one of them */
809
for(process *proc = process_list; proc ; proc = proc->next){
1201
for(plugin *proc = plugin_list; proc != NULL;){
810
1202
/* Is this process completely done? */
811
if(proc->eof and proc->completed){
1203
if(proc->completed and proc->eof){
812
1204
/* Only accept the plugin output if it exited cleanly */
813
1205
if(not WIFEXITED(proc->status)
814
1206
or WEXITSTATUS(proc->status) != 0){
815
1207
/* Bad exit by plugin */
1208
816
1209
if(debug){
817
1210
if(WIFEXITED(proc->status)){
818
fprintf(stderr, "Plugin %u exited with status %d\n",
819
(unsigned int) (proc->pid),
1211
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1212
" status %d\n", proc->name,
1213
(intmax_t) (proc->pid),
820
1214
WEXITSTATUS(proc->status));
821
} else if(WIFSIGNALED(proc->status)) {
822
fprintf(stderr, "Plugin %u killed by signal %d\n",
823
(unsigned int) (proc->pid),
824
WTERMSIG(proc->status));
825
} else if(WCOREDUMP(proc->status)){
826
fprintf(stderr, "Plugin %d dumped core\n",
827
(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)));
828
1221
}
829
1222
}
1223
830
1224
/* Remove the plugin */
831
1225
FD_CLR(proc->fd, &rfds_all);
1226
832
1227
/* Block signal while modifying process_list */
833
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));
834
1232
if(ret < 0){
835
perror("sigprocmask");
836
exitstatus = EXIT_FAILURE;
1233
error(0, errno, "sigprocmask");
1234
exitstatus = EX_OSERR;
837
1235
goto fallback;
838
1236
}
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
843
} else {
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
846
if(p->next == proc){
847
p->next = proc->next;
848
break;
849
}
850
}
851
}
1237
1238
plugin *next_plugin = proc->next;
1239
free_plugin(proc);
1240
proc = next_plugin;
1241
852
1242
/* We are done modifying process list, so unblock signal */
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
NULL);
1243
ret = (int)(TEMP_FAILURE_RETRY
1244
(sigprocmask(SIG_UNBLOCK,
1245
&sigchld_action.sa_mask, NULL)));
855
1246
if(ret < 0){
856
perror("sigprocmask");
857
}
858
free(proc->buffer);
859
free(proc);
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
862
the process list */
863
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;
864
1257
}
1258
865
1259
/* This process exited nicely, so print its buffer */
866
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1260
1261
bool bret = print_out_password(proc->buffer,
1262
proc->buffer_length);
868
1263
if(not bret){
869
perror("print_out_password");
870
exitstatus = EXIT_FAILURE;
1264
error(0, errno, "print_out_password");
1265
exitstatus = EX_IOERR;
871
1266
}
872
1267
goto fallback;
873
1268
}
1269
874
1270
/* This process has not completed. Does it have any output? */
875
1271
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
876
1272
/* This process had nothing to say at this time */
1273
proc = proc->next;
877
1274
continue;
878
1275
}
879
1276
/* Before reading, make the process' data buffer large enough */
880
1277
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
881
proc->buffer = realloc(proc->buffer, proc->buffer_size
882
+ (size_t) BUFFER_SIZE);
883
if (proc->buffer == NULL){
884
perror("malloc");
885
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;
886
1283
goto fallback;
887
1284
}
1285
proc->buffer = new_buffer;
888
1286
proc->buffer_size += BUFFER_SIZE;
889
1287
}
890
1288
/* Read from the process */
891
ret = read(proc->fd, proc->buffer + proc->buffer_length,
892
BUFFER_SIZE);
893
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){
894
1294
/* Read error from this process; ignore the error */
1295
proc = proc->next;
895
1296
continue;
896
1297
}
897
if(ret == 0){
1298
if(sret == 0){
898
1299
/* got EOF */
899
1300
proc->eof = true;
900
1301
} else {
901
proc->buffer_length += (size_t) ret;
1302
proc->buffer_length += (size_t) sret;
902
1303
}
903
1304
}
904
1305
}
905
906
1306
1307
907
1308
fallback:
908
1309
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1310
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1311
and exitstatus != EX_OK)){
1312
/* Fallback if all plugins failed, none are found or an error
1313
occured */
911
1314
bool bret;
912
1315
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
913
1316
char *passwordbuffer = getpass("Password: ");
914
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);
915
1324
if(not bret){
916
perror("print_out_password");
917
exitstatus = EXIT_FAILURE;
1325
error(0, errno, "print_out_password");
1326
exitstatus = EX_IOERR;
918
1327
}
919
1328
}
920
1329
921
1330
/* Restore old signal handler */
922
1331
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
923
1332
if(ret == -1){
924
perror("sigaction");
925
exitstatus = EXIT_FAILURE;
1333
error(0, errno, "sigaction");
1334
exitstatus = EX_OSERR;
926
1335
}
927
1336
928
1337
if(custom_argv != NULL){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1338
for(char **arg = custom_argv+1; *arg != NULL; arg++){
930
1339
free(*arg);
931
1340
}
932
1341
free(custom_argv);
933
1342
}
934
free_plugin_list(plugin_list);
935
936
if(dir != NULL){
937
closedir(dir);
1343
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
938
1348
}
939
1349
940
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
947
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
}
948
1359
}
949
free(process_list->buffer);
950
free(process_list);
951
1360
}
952
1361
953
1362
/* Wait for any remaining child processes to terminate */
954
do{
1363
do {
955
1364
ret = wait(NULL);
956
1365
} while(ret >= 0);
957
1366
if(errno != ECHILD){
958
perror("wait");
1367
error(0, errno, "wait");
959
1368
}
960
1369
1370
free_plugin_list();
1371
1372
free(plugindir);
1373
free(pluginhelperdir);
1374
free(argfile);
1375
961
1376
return exitstatus;
962
1377
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0