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- Committer: Teddy Hogeborn
- Date: 2016-11-26 23:18:55 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 356.
- Revision ID: teddy@recompile.se-20161126231855-vseam120ph8856a1
Add more PEP8 compliance (as per the "pycodestyle" tool).
* mandos: Add an empty line to be more PEP8 compliant.
* mandos-monitor: - '' -
* mandos: Add an empty line to be more PEP8 compliant.
* mandos-monitor: - '' -
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files removed:
- plugins.d/usplash
- 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
5
* Copyright © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
O_CLOEXEC, pipe2() */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#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() */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG() */
41
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
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 <dirent.h> /* struct dirent, scandirat() */
44
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
45
FD_CLOEXEC, write(), STDOUT_FILENO,
46
struct stat, fstat(), close(),
47
setgid(), setuid(), S_ISREG(),
48
faccessat() pipe2(), fork(),
49
_exit(), dup2(), fexecve(), read()
50
*/
52
51
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
52
FD_CLOEXEC, openat(), scandirat(),
53
pipe2() */
54
#include <string.h> /* strsep, strlen(), strsignal(),
55
strcmp(), strncmp() */
55
56
#include <errno.h> /* errno */
56
57
#include <argp.h> /* struct argp_option, struct
57
58
argp_state, struct argp,
61
62
#include <signal.h> /* struct sigaction, sigemptyset(),
62
63
sigaddset(), sigaction(),
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
65
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
69
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
70
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
71
#include <errno.h> /* errno */
72
#include <error.h> /* error() */
73
#include <fnmatch.h> /* fnmatch() */
66
74
67
75
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
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;
76
77
#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
86
83
87
84
typedef struct plugin{
88
85
char *name; /* can be NULL or any plugin name */
91
88
char **environ;
92
89
int envc;
93
90
bool disabled;
91
92
/* Variables used for running processes*/
93
pid_t pid;
94
int fd;
95
char *buffer;
96
size_t buffer_size;
97
size_t buffer_length;
98
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
94
101
struct plugin *next;
95
102
} plugin;
96
103
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))){
104
static plugin *plugin_list = NULL;
105
106
/* Gets an existing plugin based on name,
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
static plugin *getplugin(char *name){
110
/* Check for existing plugin with that name */
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
if((p->name == name)
113
or (p->name and name and (strcmp(p->name, name) == 0))){
101
114
return p;
102
115
}
103
116
}
104
117
/* Create a new plugin */
105
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
107
123
return NULL;
108
124
}
109
125
char *copy_name = NULL;
110
126
if(name != NULL){
111
copy_name = strdup(name);
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
112
130
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
113
134
return NULL;
114
135
}
115
136
}
116
137
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
122
142
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
147
int e = errno;
125
148
free(copy_name);
126
149
free(new_plugin);
150
errno = e;
127
151
return NULL;
128
152
}
129
153
new_plugin->argv[0] = copy_name;
130
154
new_plugin->argv[1] = NULL;
131
132
new_plugin->environ = malloc(sizeof(char *));
155
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
133
159
if(new_plugin->environ == NULL){
160
int e = errno;
134
161
free(copy_name);
135
162
free(new_plugin->argv);
136
163
free(new_plugin);
164
errno = e;
137
165
return NULL;
138
166
}
139
167
new_plugin->environ[0] = NULL;
168
140
169
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
170
plugin_list = new_plugin;
142
171
return new_plugin;
143
172
}
144
173
145
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
146
176
static bool add_to_char_array(const char *new, char ***array,
147
177
int *len){
148
178
/* Resize the pointed-to array to hold one more pointer */
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
151
184
/* Malloc check */
152
if(*array == NULL){
185
if(new_array == NULL){
153
186
return false;
154
187
}
188
*array = new_array;
155
189
/* Make a copy of the new string */
156
char *copy = strdup(new);
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
157
194
if(copy == NULL){
158
195
return false;
159
196
}
166
203
}
167
204
168
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
169
207
static bool add_argument(plugin *p, const char *arg){
170
208
if(p == NULL){
171
209
return false;
174
212
}
175
213
176
214
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
215
__attribute__((nonnull(2), warn_unused_result))
216
static bool add_environment(plugin *p, const char *def, bool replace){
178
217
if(p == NULL){
179
218
return false;
180
219
}
220
/* namelen = length of name of environment variable */
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
225
/* It already exists */
226
if(replace){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
232
return false;
233
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
236
}
237
return true;
238
}
239
}
181
240
return add_to_char_array(def, &(p->environ), &(p->envc));
182
241
}
183
242
184
243
#ifndef O_CLOEXEC
185
244
/*
186
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
246
* Descriptor Flags".
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
189
248
*/
190
static int set_cloexec_flag(int fd)
191
{
192
int ret = fcntl(fd, F_GETFD, 0);
249
__attribute__((warn_unused_result))
250
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
193
252
/* If reading the flags failed, return error indication now. */
194
253
if(ret < 0){
195
254
return ret;
196
255
}
197
256
/* Store modified flag word in the descriptor. */
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
199
259
}
260
#endif /* not O_CLOEXEC */
200
261
201
process *process_list = NULL;
202
262
203
263
/* Mark processes as completed when they exit, and save their exit
204
264
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
265
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
206
267
while(true){
207
process *proc = process_list;
268
plugin *proc = plugin_list;
208
269
int status;
209
270
pid_t pid = waitpid(-1, &status, WNOHANG);
210
271
if(pid == 0){
212
273
break;
213
274
}
214
275
if(pid == -1){
215
if (errno != ECHILD){
216
perror("waitpid");
276
if(errno == ECHILD){
277
/* No child processes */
278
break;
217
279
}
218
/* No child processes */
219
break;
280
error(0, errno, "waitpid");
220
281
}
221
282
222
283
/* A child exited, find it in process_list */
223
284
while(proc != NULL and proc->pid != pid){
224
285
proc = proc->next;
228
289
continue;
229
290
}
230
291
proc->status = status;
231
proc->completed = true;
292
proc->completed = 1;
232
293
}
294
errno = old_errno;
233
295
}
234
296
235
bool print_out_password(const char *buffer, size_t length){
297
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
299
static bool print_out_password(const char *buffer, size_t length){
236
300
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
301
for(size_t written = 0; written < length; written += (size_t)ret){
241
302
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
303
length - written));
247
308
return true;
248
309
}
249
310
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;
311
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
313
static void free_plugin(plugin *plugin_node){
314
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
316
free(*arg);
317
}
318
free(plugin_node->argv);
319
for(char **env = plugin_node->environ; *env != NULL; env++){
320
free(*env);
321
}
322
free(plugin_node->environ);
323
free(plugin_node->buffer);
324
325
/* Removes the plugin from the singly-linked list */
326
if(plugin_node == plugin_list){
327
/* First one - simple */
328
plugin_list = plugin_list->next;
329
} else {
330
/* Second one or later */
331
for(plugin *p = plugin_list; p != NULL; p = p->next){
332
if(p->next == plugin_node){
333
p->next = plugin_node->next;
334
break;
335
}
256
336
}
257
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
258
argv[1] = NULL;
259
}
260
*argc += 1;
261
argv = realloc(argv, sizeof(char *)
262
* ((unsigned int) *argc + 1));
263
if(argv == NULL){
264
return NULL;
265
}
266
argv[*argc-1] = arg;
267
argv[*argc] = NULL;
268
return argv;
337
}
338
339
free(plugin_node);
269
340
}
270
341
271
static void free_plugin_list(plugin *plugin_list){
272
for(plugin *next; plugin_list != NULL; plugin_list = next){
273
next = plugin_list->next;
274
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_list->argv);
278
for(char **env = plugin_list->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_list->environ);
282
free(plugin_list);
342
static void free_plugin_list(void){
343
while(plugin_list != NULL){
344
free_plugin(plugin_list);
283
345
}
284
346
}
285
347
286
348
int main(int argc, char *argv[]){
287
const char *plugindir = "/lib/mandos/plugins.d";
288
const char *argfile = ARGFILE;
349
char *plugindir = NULL;
350
char *pluginhelperdir = NULL;
351
char *argfile = NULL;
289
352
FILE *conffp;
290
size_t d_name_len;
291
DIR *dir = NULL;
292
struct dirent *dirst;
353
struct dirent **direntries = NULL;
293
354
struct stat st;
294
355
fd_set rfds_all;
295
356
int ret, maxfd = 0;
357
ssize_t sret;
296
358
uid_t uid = 65534;
297
359
gid_t gid = 65534;
298
360
bool debug = false;
302
364
.sa_flags = SA_NOCLDSTOP };
303
365
char **custom_argv = NULL;
304
366
int custom_argc = 0;
367
int dir_fd = -1;
305
368
306
369
/* Establish a signal handler */
307
370
sigemptyset(&sigchld_action.sa_mask);
308
371
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
309
372
if(ret == -1){
310
perror("sigaddset");
311
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaddset");
374
exitstatus = EX_OSERR;
312
375
goto fallback;
313
376
}
314
377
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
315
378
if(ret == -1){
316
perror("sigaction");
317
exitstatus = EXIT_FAILURE;
379
error(0, errno, "sigaction");
380
exitstatus = EX_OSERR;
318
381
goto fallback;
319
382
}
320
383
323
386
{ .name = "global-options", .key = 'g',
324
387
.arg = "OPTION[,OPTION[,...]]",
325
388
.doc = "Options passed to all plugins" },
326
{ .name = "global-envs", .key = 'e',
389
{ .name = "global-env", .key = 'G',
327
390
.arg = "VAR=value",
328
391
.doc = "Environment variable passed to all plugins" },
329
392
{ .name = "options-for", .key = 'o',
330
393
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
331
394
.doc = "Options passed only to specified plugin" },
332
{ .name = "envs-for", .key = 'f',
395
{ .name = "env-for", .key = 'E',
333
396
.arg = "PLUGIN:ENV=value",
334
397
.doc = "Environment variable passed to specified plugin" },
335
398
{ .name = "disable", .key = 'd',
336
399
.arg = "PLUGIN",
337
400
.doc = "Disable a specific plugin", .group = 1 },
401
{ .name = "enable", .key = 'e',
402
.arg = "PLUGIN",
403
.doc = "Enable a specific plugin", .group = 1 },
338
404
{ .name = "plugin-dir", .key = 128,
339
405
.arg = "DIRECTORY",
340
406
.doc = "Specify a different plugin directory", .group = 2 },
341
{ .name = "userid", .key = 129,
342
.arg = "ID", .flags = 0,
343
.doc = "User ID the plugins will run as", .group = 2 },
344
{ .name = "groupid", .key = 130,
345
.arg = "ID", .flags = 0,
346
.doc = "Group ID the plugins will run as", .group = 2 },
347
{ .name = "debug", .key = 131,
348
.doc = "Debug mode", .group = 3 },
407
{ .name = "config-file", .key = 129,
408
.arg = "FILE",
409
.doc = "Specify a different configuration file", .group = 2 },
410
{ .name = "userid", .key = 130,
411
.arg = "ID", .flags = 0,
412
.doc = "User ID the plugins will run as", .group = 3 },
413
{ .name = "groupid", .key = 131,
414
.arg = "ID", .flags = 0,
415
.doc = "Group ID the plugins will run as", .group = 3 },
416
{ .name = "debug", .key = 132,
417
.doc = "Debug mode", .group = 4 },
418
{ .name = "plugin-helper-dir", .key = 133,
419
.arg = "DIRECTORY",
420
.doc = "Specify a different plugin helper directory",
421
.group = 2 },
422
/*
423
* These reproduce what we would get without ARGP_NO_HELP
424
*/
425
{ .name = "help", .key = '?',
426
.doc = "Give this help list", .group = -1 },
427
{ .name = "usage", .key = -3,
428
.doc = "Give a short usage message", .group = -1 },
429
{ .name = "version", .key = 'V',
430
.doc = "Print program version", .group = -1 },
349
431
{ .name = NULL }
350
432
};
351
433
352
error_t parse_opt (int key, char *arg, struct argp_state *state) {
353
/* Get the INPUT argument from `argp_parse', which we know is a
354
pointer to our plugin list pointer. */
355
plugin **plugins = state->input;
356
switch (key) {
357
case 'g':
358
if (arg != NULL){
359
char *p;
360
while((p = strsep(&arg, ",")) != NULL){
361
if(p[0] == '\0'){
362
continue;
363
}
364
if(not add_argument(getplugin(NULL, plugins), p)){
365
perror("add_argument");
366
return ARGP_ERR_UNKNOWN;
367
}
368
}
369
}
370
break;
371
case 'e':
372
if(arg == NULL){
373
break;
374
}
375
{
376
char *envdef = strdup(arg);
377
if(envdef == NULL){
378
break;
379
}
380
if(not add_environment(getplugin(NULL, plugins), envdef)){
381
perror("add_environment");
382
}
383
}
384
break;
385
case 'o':
386
if (arg != NULL){
387
char *p_name = strsep(&arg, ":");
388
if(p_name[0] == '\0'){
389
break;
390
}
391
char *opt = strsep(&arg, ":");
392
if(opt[0] == '\0'){
393
break;
394
}
395
if(opt != NULL){
396
char *p;
397
while((p = strsep(&opt, ",")) != NULL){
398
if(p[0] == '\0'){
399
continue;
400
}
401
if(not add_argument(getplugin(p_name, plugins), p)){
402
perror("add_argument");
403
return ARGP_ERR_UNKNOWN;
404
}
405
}
406
}
407
}
408
break;
409
case 'f':
410
if(arg == NULL){
411
break;
412
}
434
__attribute__((nonnull(3)))
435
error_t parse_opt(int key, char *arg, struct argp_state *state){
436
errno = 0;
437
switch(key){
438
char *tmp;
439
intmax_t tmp_id;
440
case 'g': /* --global-options */
441
{
442
char *plugin_option;
443
while((plugin_option = strsep(&arg, ",")) != NULL){
444
if(not add_argument(getplugin(NULL), plugin_option)){
445
break;
446
}
447
}
448
errno = 0;
449
}
450
break;
451
case 'G': /* --global-env */
452
if(add_environment(getplugin(NULL), arg, true)){
453
errno = 0;
454
}
455
break;
456
case 'o': /* --options-for */
457
{
458
char *option_list = strchr(arg, ':');
459
if(option_list == NULL){
460
argp_error(state, "No colon in \"%s\"", arg);
461
errno = EINVAL;
462
break;
463
}
464
*option_list = '\0';
465
option_list++;
466
if(arg[0] == '\0'){
467
argp_error(state, "Empty plugin name");
468
errno = EINVAL;
469
break;
470
}
471
char *option;
472
while((option = strsep(&option_list, ",")) != NULL){
473
if(not add_argument(getplugin(arg), option)){
474
break;
475
}
476
}
477
errno = 0;
478
}
479
break;
480
case 'E': /* --env-for */
413
481
{
414
482
char *envdef = strchr(arg, ':');
415
483
if(envdef == NULL){
416
break;
417
}
418
char *p_name = strndup(arg, (size_t) (envdef-arg));
419
if(p_name == NULL){
420
break;
421
}
484
argp_error(state, "No colon in \"%s\"", arg);
485
errno = EINVAL;
486
break;
487
}
488
*envdef = '\0';
422
489
envdef++;
423
if(not add_environment(getplugin(p_name, plugins), envdef)){
424
perror("add_environment");
425
}
426
}
427
break;
428
case 'd':
429
if (arg != NULL){
430
plugin *p = getplugin(arg, plugins);
431
if(p == NULL){
432
return ARGP_ERR_UNKNOWN;
433
}
434
p->disabled = true;
435
}
436
break;
437
case 128:
438
plugindir = arg;
439
break;
440
case 129:
441
uid = (uid_t)strtol(arg, NULL, 10);
442
break;
443
case 130:
444
gid = (gid_t)strtol(arg, NULL, 10);
445
break;
446
case 131:
490
if(arg[0] == '\0'){
491
argp_error(state, "Empty plugin name");
492
errno = EINVAL;
493
break;
494
}
495
if(add_environment(getplugin(arg), envdef, true)){
496
errno = 0;
497
}
498
}
499
break;
500
case 'd': /* --disable */
501
{
502
plugin *p = getplugin(arg);
503
if(p != NULL){
504
p->disabled = true;
505
errno = 0;
506
}
507
}
508
break;
509
case 'e': /* --enable */
510
{
511
plugin *p = getplugin(arg);
512
if(p != NULL){
513
p->disabled = false;
514
errno = 0;
515
}
516
}
517
break;
518
case 128: /* --plugin-dir */
519
free(plugindir);
520
plugindir = strdup(arg);
521
if(plugindir != NULL){
522
errno = 0;
523
}
524
break;
525
case 129: /* --config-file */
526
/* This is already done by parse_opt_config_file() */
527
break;
528
case 130: /* --userid */
529
tmp_id = strtoimax(arg, &tmp, 10);
530
if(errno != 0 or tmp == arg or *tmp != '\0'
531
or tmp_id != (uid_t)tmp_id){
532
argp_error(state, "Bad user ID number: \"%s\", using %"
533
PRIdMAX, arg, (intmax_t)uid);
534
break;
535
}
536
uid = (uid_t)tmp_id;
537
errno = 0;
538
break;
539
case 131: /* --groupid */
540
tmp_id = strtoimax(arg, &tmp, 10);
541
if(errno != 0 or tmp == arg or *tmp != '\0'
542
or tmp_id != (gid_t)tmp_id){
543
argp_error(state, "Bad group ID number: \"%s\", using %"
544
PRIdMAX, arg, (intmax_t)gid);
545
break;
546
}
547
gid = (gid_t)tmp_id;
548
errno = 0;
549
break;
550
case 132: /* --debug */
447
551
debug = true;
448
552
break;
449
case ARGP_KEY_ARG:
450
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
451
break;
452
case ARGP_KEY_END:
453
break;
454
default:
455
return ARGP_ERR_UNKNOWN;
456
}
457
return 0;
458
}
459
460
plugin *plugin_list = NULL;
461
462
struct argp argp = { .options = options, .parser = parse_opt,
463
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
553
case 133: /* --plugin-helper-dir */
554
free(pluginhelperdir);
555
pluginhelperdir = strdup(arg);
556
if(pluginhelperdir != NULL){
557
errno = 0;
558
}
559
break;
560
/*
561
* These reproduce what we would get without ARGP_NO_HELP
562
*/
563
case '?': /* --help */
564
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
565
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
566
case -3: /* --usage */
567
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
568
argp_state_help(state, state->out_stream,
569
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
570
case 'V': /* --version */
571
fprintf(state->out_stream, "%s\n", argp_program_version);
572
exit(EXIT_SUCCESS);
573
break;
574
/*
575
* When adding more options before this line, remember to also add a
576
* "case" to the "parse_opt_config_file" function below.
577
*/
578
case ARGP_KEY_ARG:
579
/* Cryptsetup always passes an argument, which is an empty
580
string if "none" was specified in /etc/crypttab. So if
581
argument was empty, we ignore it silently. */
582
if(arg[0] == '\0'){
583
break;
584
}
585
default:
586
return ARGP_ERR_UNKNOWN;
587
}
588
return errno; /* Set to 0 at start */
589
}
590
591
/* This option parser is the same as parse_opt() above, except it
592
ignores everything but the --config-file option. */
593
error_t parse_opt_config_file(int key, char *arg,
594
__attribute__((unused))
595
struct argp_state *state){
596
errno = 0;
597
switch(key){
598
case 'g': /* --global-options */
599
case 'G': /* --global-env */
600
case 'o': /* --options-for */
601
case 'E': /* --env-for */
602
case 'd': /* --disable */
603
case 'e': /* --enable */
604
case 128: /* --plugin-dir */
605
break;
606
case 129: /* --config-file */
607
free(argfile);
608
argfile = strdup(arg);
609
if(argfile != NULL){
610
errno = 0;
611
}
612
break;
613
case 130: /* --userid */
614
case 131: /* --groupid */
615
case 132: /* --debug */
616
case 133: /* --plugin-helper-dir */
617
case '?': /* --help */
618
case -3: /* --usage */
619
case 'V': /* --version */
620
case ARGP_KEY_ARG:
621
break;
622
default:
623
return ARGP_ERR_UNKNOWN;
624
}
625
return errno;
626
}
627
628
struct argp argp = { .options = options,
629
.parser = parse_opt_config_file,
630
.args_doc = "",
464
631
.doc = "Mandos plugin runner -- Run plugins" };
465
632
466
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
467
if (ret == ARGP_ERR_UNKNOWN){
468
fprintf(stderr, "Unknown error while parsing arguments\n");
469
exitstatus = EXIT_FAILURE;
470
goto fallback;
471
}
472
473
conffp = fopen(argfile, "r");
633
/* Parse using parse_opt_config_file() in order to get the custom
634
config file location, if any. */
635
ret = argp_parse(&argp, argc, argv,
636
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
637
NULL, NULL);
638
switch(ret){
639
case 0:
640
break;
641
case ENOMEM:
642
default:
643
errno = ret;
644
error(0, errno, "argp_parse");
645
exitstatus = EX_OSERR;
646
goto fallback;
647
case EINVAL:
648
exitstatus = EX_USAGE;
649
goto fallback;
650
}
651
652
/* Reset to the normal argument parser */
653
argp.parser = parse_opt;
654
655
/* Open the configfile if available */
656
if(argfile == NULL){
657
conffp = fopen(AFILE, "r");
658
} else {
659
conffp = fopen(argfile, "r");
660
}
474
661
if(conffp != NULL){
475
662
char *org_line = NULL;
476
663
char *p, *arg, *new_arg, *line;
477
664
size_t size = 0;
478
ssize_t sret;
479
665
const char whitespace_delims[] = " \r\t\f\v\n";
480
666
const char comment_delim[] = "#";
481
667
668
custom_argc = 1;
669
custom_argv = malloc(sizeof(char*) * 2);
670
if(custom_argv == NULL){
671
error(0, errno, "malloc");
672
exitstatus = EX_OSERR;
673
goto fallback;
674
}
675
custom_argv[0] = argv[0];
676
custom_argv[1] = NULL;
677
678
/* for each line in the config file, strip whitespace and ignore
679
commented text */
482
680
while(true){
483
681
sret = getline(&org_line, &size, conffp);
484
682
if(sret == -1){
485
683
break;
486
684
}
487
685
488
686
line = org_line;
489
687
arg = strsep(&line, comment_delim);
490
688
while((p = strsep(&arg, whitespace_delims)) != NULL){
492
690
continue;
493
691
}
494
692
new_arg = strdup(p);
495
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
496
if (custom_argv == NULL){
497
perror("add_to_argv");
498
exitstatus = EXIT_FAILURE;
693
if(new_arg == NULL){
694
error(0, errno, "strdup");
695
exitstatus = EX_OSERR;
696
free(org_line);
499
697
goto fallback;
500
698
}
699
700
custom_argc += 1;
701
{
702
char **new_argv = realloc(custom_argv, sizeof(char *)
703
* ((size_t)custom_argc + 1));
704
if(new_argv == NULL){
705
error(0, errno, "realloc");
706
exitstatus = EX_OSERR;
707
free(new_arg);
708
free(org_line);
709
goto fallback;
710
} else {
711
custom_argv = new_argv;
712
}
713
}
714
custom_argv[custom_argc-1] = new_arg;
715
custom_argv[custom_argc] = NULL;
501
716
}
502
717
}
718
do {
719
ret = fclose(conffp);
720
} while(ret == EOF and errno == EINTR);
721
if(ret == EOF){
722
error(0, errno, "fclose");
723
exitstatus = EX_IOERR;
724
goto fallback;
725
}
503
726
free(org_line);
504
} else{
727
} else {
505
728
/* Check for harmful errors and go to fallback. Other errors might
506
729
not affect opening plugins */
507
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
508
perror("fopen");
509
exitstatus = EXIT_FAILURE;
730
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
731
error(0, errno, "fopen");
732
exitstatus = EX_OSERR;
510
733
goto fallback;
511
734
}
512
735
}
513
736
/* If there were any arguments from the configuration file, pass
737
them to parser as command line arguments */
514
738
if(custom_argv != NULL){
515
custom_argv[0] = argv[0];
516
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
517
if (ret == ARGP_ERR_UNKNOWN){
518
fprintf(stderr, "Unknown error while parsing arguments\n");
519
exitstatus = EXIT_FAILURE;
520
goto fallback;
739
ret = argp_parse(&argp, custom_argc, custom_argv,
740
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
741
NULL, NULL);
742
switch(ret){
743
case 0:
744
break;
745
case ENOMEM:
746
default:
747
errno = ret;
748
error(0, errno, "argp_parse");
749
exitstatus = EX_OSERR;
750
goto fallback;
751
case EINVAL:
752
exitstatus = EX_CONFIG;
753
goto fallback;
754
}
755
}
756
757
/* Parse actual command line arguments, to let them override the
758
config file */
759
ret = argp_parse(&argp, argc, argv,
760
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
761
NULL, NULL);
762
switch(ret){
763
case 0:
764
break;
765
case ENOMEM:
766
default:
767
errno = ret;
768
error(0, errno, "argp_parse");
769
exitstatus = EX_OSERR;
770
goto fallback;
771
case EINVAL:
772
exitstatus = EX_USAGE;
773
goto fallback;
774
}
775
776
{
777
char *pluginhelperenv;
778
bool bret = true;
779
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
780
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
781
if(ret != -1){
782
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
783
}
784
if(ret == -1 or not bret){
785
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
786
" environment variable to \"%s\" for all plugins\n",
787
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
788
}
789
if(ret != -1){
790
free(pluginhelperenv);
521
791
}
522
792
}
523
793
528
798
for(char **a = p->argv; *a != NULL; a++){
529
799
fprintf(stderr, "\tArg: %s\n", *a);
530
800
}
531
fprintf(stderr, "...and %u environment variables\n", p->envc);
801
fprintf(stderr, "...and %d environment variables\n", p->envc);
532
802
for(char **a = p->environ; *a != NULL; a++){
533
803
fprintf(stderr, "\t%s\n", *a);
534
804
}
535
805
}
536
806
}
537
807
808
if(getuid() == 0){
809
/* Work around Debian bug #633582:
810
<https://bugs.debian.org/633582> */
811
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
812
if(plugindir_fd == -1){
813
if(errno != ENOENT){
814
error(0, errno, "open(\"" PDIR "\")");
815
}
816
} else {
817
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
818
if(ret == -1){
819
error(0, errno, "fstat");
820
} else {
821
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
822
ret = fchown(plugindir_fd, uid, gid);
823
if(ret == -1){
824
error(0, errno, "fchown");
825
}
826
}
827
}
828
close(plugindir_fd);
829
}
830
}
831
832
/* Lower permissions */
833
ret = setgid(gid);
834
if(ret == -1){
835
error(0, errno, "setgid");
836
}
538
837
ret = setuid(uid);
539
if (ret == -1){
540
perror("setuid");
541
}
542
543
setgid(gid);
544
if (ret == -1){
545
perror("setgid");
546
}
547
548
dir = opendir(plugindir);
549
if(dir == NULL){
550
perror("Could not open plugin dir");
551
exitstatus = EXIT_FAILURE;
552
goto fallback;
553
}
554
555
/* Set the FD_CLOEXEC flag on the directory, if possible */
838
if(ret == -1){
839
error(0, errno, "setuid");
840
}
841
842
/* Open plugin directory with close_on_exec flag */
556
843
{
557
int dir_fd = dirfd(dir);
558
if(dir_fd >= 0){
559
ret = set_cloexec_flag(dir_fd);
560
if(ret < 0){
561
perror("set_cloexec_flag");
562
exitstatus = EXIT_FAILURE;
563
goto fallback;
844
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
845
#ifdef O_CLOEXEC
846
O_CLOEXEC
847
#else /* not O_CLOEXEC */
848
0
849
#endif /* not O_CLOEXEC */
850
);
851
if(dir_fd == -1){
852
error(0, errno, "Could not open plugin dir");
853
exitstatus = EX_UNAVAILABLE;
854
goto fallback;
855
}
856
857
#ifndef O_CLOEXEC
858
/* Set the FD_CLOEXEC flag on the directory */
859
ret = set_cloexec_flag(dir_fd);
860
if(ret < 0){
861
error(0, errno, "set_cloexec_flag");
862
exitstatus = EX_OSERR;
863
goto fallback;
864
}
865
#endif /* O_CLOEXEC */
866
}
867
868
int good_name(const struct dirent * const dirent){
869
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
870
"*.dpkg-old", "*.dpkg-bak",
871
"*.dpkg-divert", NULL };
872
#ifdef __GNUC__
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
875
#endif
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
878
#ifdef __GNUC__
879
#pragma GCC diagnostic pop
880
#endif
881
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
882
!= FNM_NOMATCH){
883
if(debug){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirent->d_name, *pat);
886
}
887
return 0;
564
888
}
565
889
}
890
return 1;
891
}
892
893
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
894
alphasort);
895
if(numplugins == -1){
896
error(0, errno, "Could not scan plugin dir");
897
direntries = NULL;
898
exitstatus = EX_OSERR;
899
goto fallback;
566
900
}
567
901
568
902
FD_ZERO(&rfds_all);
569
903
570
while(true){
571
dirst = readdir(dir);
572
573
// All directory entries have been processed
574
if(dirst == NULL){
575
if (errno == EBADF){
576
perror("readdir");
577
exitstatus = EXIT_FAILURE;
578
goto fallback;
579
}
580
break;
581
}
582
583
d_name_len = strlen(dirst->d_name);
584
585
// Ignore dotfiles, backup files and other junk
586
{
587
bool bad_name = false;
588
589
const char const *bad_prefixes[] = { ".", "#", NULL };
590
591
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
592
".dpkg-old",
593
".dpkg-divert", NULL };
594
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
595
size_t pre_len = strlen(*pre);
596
if((d_name_len >= pre_len)
597
and strncmp((dirst->d_name), *pre, pre_len) == 0){
598
if(debug){
599
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
600
" with bad prefix %s\n", dirst->d_name, *pre);
601
}
602
bad_name = true;
603
break;
604
}
605
}
606
607
if(bad_name){
608
continue;
609
}
610
611
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
612
size_t suf_len = strlen(*suf);
613
if((d_name_len >= suf_len)
614
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
615
== 0)){
616
if(debug){
617
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
618
" with bad suffix %s\n", dirst->d_name, *suf);
619
}
620
bad_name = true;
621
break;
622
}
623
}
624
625
if(bad_name){
626
continue;
627
}
628
}
629
630
char *filename;
631
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
632
if(ret < 0){
633
perror("asprintf");
634
continue;
635
}
636
637
ret = stat(filename, &st);
638
if (ret == -1){
639
perror("stat");
640
free(filename);
641
continue;
642
}
643
644
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
904
/* Read and execute any executable in the plugin directory*/
905
for(int i = 0; i < numplugins; i++){
906
907
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
908
if(plugin_fd == -1){
909
error(0, errno, "Could not open plugin");
910
free(direntries[i]);
911
continue;
912
}
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
914
if(ret == -1){
915
error(0, errno, "stat");
916
close(plugin_fd);
917
free(direntries[i]);
918
continue;
919
}
920
921
/* Ignore non-executable files */
922
if(not S_ISREG(st.st_mode)
923
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
924
X_OK, 0)) != 0)){
645
925
if(debug){
646
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
647
" with bad type or mode\n", filename);
926
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
927
" with bad type or mode\n",
928
plugindir != NULL ? plugindir : PDIR,
929
direntries[i]->d_name);
648
930
}
649
free(filename);
931
close(plugin_fd);
932
free(direntries[i]);
650
933
continue;
651
934
}
652
plugin *p = getplugin(dirst->d_name, &plugin_list);
935
936
plugin *p = getplugin(direntries[i]->d_name);
653
937
if(p == NULL){
654
perror("getplugin");
655
free(filename);
938
error(0, errno, "getplugin");
939
close(plugin_fd);
940
free(direntries[i]);
656
941
continue;
657
942
}
658
943
if(p->disabled){
659
944
if(debug){
660
945
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
661
dirst->d_name);
946
direntries[i]->d_name);
662
947
}
663
free(filename);
948
close(plugin_fd);
949
free(direntries[i]);
664
950
continue;
665
951
}
666
952
{
667
953
/* Add global arguments to argument list for this plugin */
668
plugin *g = getplugin(NULL, &plugin_list);
954
plugin *g = getplugin(NULL);
669
955
if(g != NULL){
670
956
for(char **a = g->argv + 1; *a != NULL; a++){
671
957
if(not add_argument(p, *a)){
672
perror("add_argument");
958
error(0, errno, "add_argument");
673
959
}
674
960
}
675
961
/* Add global environment variables */
676
962
for(char **e = g->environ; *e != NULL; e++){
677
if(not add_environment(p, *e)){
678
perror("add_environment");
963
if(not add_environment(p, *e, false)){
964
error(0, errno, "add_environment");
679
965
}
680
966
}
681
967
}
682
968
}
683
/* If this plugin has any environment variables, we will call
684
using execve and need to duplicate the environment from this
685
process, too. */
969
/* If this plugin has any environment variables, we need to
970
duplicate the environment from this process, too. */
686
971
if(p->environ[0] != NULL){
687
972
for(char **e = environ; *e != NULL; e++){
688
char *copy = strdup(*e);
689
if(copy == NULL){
690
perror("strdup");
691
continue;
692
}
693
if(not add_environment(p, copy)){
694
perror("add_environment");
973
if(not add_environment(p, *e, false)){
974
error(0, errno, "add_environment");
695
975
}
696
976
}
697
977
}
698
978
699
979
int pipefd[2];
700
ret = pipe(pipefd);
701
if (ret == -1){
702
perror("pipe");
703
exitstatus = EXIT_FAILURE;
704
goto fallback;
705
}
980
#ifndef O_CLOEXEC
981
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
982
#else /* O_CLOEXEC */
983
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
984
#endif /* O_CLOEXEC */
985
if(ret == -1){
986
error(0, errno, "pipe");
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
989
goto fallback;
990
}
991
if(pipefd[0] >= FD_SETSIZE){
992
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
993
FD_SETSIZE);
994
close(pipefd[0]);
995
close(pipefd[1]);
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
#ifndef O_CLOEXEC
1001
/* Ask OS to automatic close the pipe on exec */
706
1002
ret = set_cloexec_flag(pipefd[0]);
707
1003
if(ret < 0){
708
perror("set_cloexec_flag");
709
exitstatus = EXIT_FAILURE;
1004
error(0, errno, "set_cloexec_flag");
1005
close(pipefd[0]);
1006
close(pipefd[1]);
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
710
1009
goto fallback;
711
1010
}
712
1011
ret = set_cloexec_flag(pipefd[1]);
713
1012
if(ret < 0){
714
perror("set_cloexec_flag");
715
exitstatus = EXIT_FAILURE;
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
716
1018
goto fallback;
717
1019
}
1020
#endif /* not O_CLOEXEC */
718
1021
/* Block SIGCHLD until process is safely in process list */
719
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1022
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1023
&sigchld_action.sa_mask,
1024
NULL));
720
1025
if(ret < 0){
721
perror("sigprocmask");
722
exitstatus = EXIT_FAILURE;
1026
error(0, errno, "sigprocmask");
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
723
1029
goto fallback;
724
1030
}
725
// Starting a new process to be watched
726
pid_t pid = fork();
1031
/* Starting a new process to be watched */
1032
pid_t pid;
1033
do {
1034
pid = fork();
1035
} while(pid == -1 and errno == EINTR);
727
1036
if(pid == -1){
728
perror("fork");
729
exitstatus = EXIT_FAILURE;
1037
error(0, errno, "fork");
1038
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1039
&sigchld_action.sa_mask, NULL));
1040
close(pipefd[0]);
1041
close(pipefd[1]);
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
730
1044
goto fallback;
731
1045
}
732
1046
if(pid == 0){
733
1047
/* this is the child process */
734
1048
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
735
1049
if(ret < 0){
736
perror("sigaction");
737
_exit(EXIT_FAILURE);
1050
error(0, errno, "sigaction");
1051
_exit(EX_OSERR);
738
1052
}
739
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1053
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
740
1054
if(ret < 0){
741
perror("sigprocmask");
742
_exit(EXIT_FAILURE);
1055
error(0, errno, "sigprocmask");
1056
_exit(EX_OSERR);
743
1057
}
744
1058
745
1059
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
746
1060
if(ret == -1){
747
perror("dup2");
748
_exit(EXIT_FAILURE);
1061
error(0, errno, "dup2");
1062
_exit(EX_OSERR);
749
1063
}
750
1064
751
if(dirfd(dir) < 0){
752
/* If dir has no file descriptor, we could not set FD_CLOEXEC
753
above and must now close it manually here. */
754
closedir(dir);
755
}
756
if(p->environ[0] == NULL){
757
if(execv(filename, p->argv) < 0){
758
perror("execv");
759
_exit(EXIT_FAILURE);
760
}
761
} else {
762
if(execve(filename, p->argv, p->environ) < 0){
763
perror("execve");
764
_exit(EXIT_FAILURE);
765
}
1065
if(fexecve(plugin_fd, p->argv,
1066
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1067
error(0, errno, "fexecve for %s/%s",
1068
plugindir != NULL ? plugindir : PDIR,
1069
direntries[i]->d_name);
1070
_exit(EX_OSERR);
766
1071
}
767
1072
/* no return */
768
1073
}
769
/* parent process */
770
free(filename);
771
close(pipefd[1]); /* close unused write end of pipe */
772
process *new_process = malloc(sizeof(process));
773
if (new_process == NULL){
774
perror("malloc");
775
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1074
/* Parent process */
1075
close(pipefd[1]); /* Close unused write end of pipe */
1076
close(plugin_fd);
1077
plugin *new_plugin = getplugin(direntries[i]->d_name);
1078
if(new_plugin == NULL){
1079
error(0, errno, "getplugin");
1080
ret = (int)(TEMP_FAILURE_RETRY
1081
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1082
NULL)));
776
1083
if(ret < 0){
777
perror("sigprocmask");
1084
error(0, errno, "sigprocmask");
778
1085
}
779
exitstatus = EXIT_FAILURE;
1086
exitstatus = EX_OSERR;
1087
free(direntries[i]);
780
1088
goto fallback;
781
1089
}
782
783
*new_process = (struct process){ .pid = pid,
784
.fd = pipefd[0],
785
.next = process_list };
786
// List handling
787
process_list = new_process;
1090
free(direntries[i]);
1091
1092
new_plugin->pid = pid;
1093
new_plugin->fd = pipefd[0];
1094
788
1095
/* Unblock SIGCHLD so signal handler can be run if this process
789
1096
has already completed */
790
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1097
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1098
&sigchld_action.sa_mask,
1099
NULL));
791
1100
if(ret < 0){
792
perror("sigprocmask");
793
exitstatus = EXIT_FAILURE;
1101
error(0, errno, "sigprocmask");
1102
exitstatus = EX_OSERR;
794
1103
goto fallback;
795
1104
}
796
1105
797
FD_SET(new_process->fd, &rfds_all);
798
799
if (maxfd < new_process->fd){
800
maxfd = new_process->fd;
801
}
802
803
}
804
805
free_plugin_list(plugin_list);
806
plugin_list = NULL;
807
808
closedir(dir);
809
dir = NULL;
810
811
if (process_list == NULL){
812
fprintf(stderr, "No plugin processes started. Incorrect plugin"
813
" directory?\n");
814
process_list = NULL;
815
}
816
while(process_list){
1106
FD_SET(new_plugin->fd, &rfds_all);
1107
1108
if(maxfd < new_plugin->fd){
1109
maxfd = new_plugin->fd;
1110
}
1111
}
1112
1113
free(direntries);
1114
direntries = NULL;
1115
close(dir_fd);
1116
dir_fd = -1;
1117
free_plugin(getplugin(NULL));
1118
1119
for(plugin *p = plugin_list; p != NULL; p = p->next){
1120
if(p->pid != 0){
1121
break;
1122
}
1123
if(p->next == NULL){
1124
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1125
" directory?\n");
1126
free_plugin_list();
1127
}
1128
}
1129
1130
/* Main loop while running plugins exist */
1131
while(plugin_list){
817
1132
fd_set rfds = rfds_all;
818
1133
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
819
if (select_ret == -1){
820
perror("select");
821
exitstatus = EXIT_FAILURE;
1134
if(select_ret == -1 and errno != EINTR){
1135
error(0, errno, "select");
1136
exitstatus = EX_OSERR;
822
1137
goto fallback;
823
1138
}
824
1139
/* OK, now either a process completed, or something can be read
825
1140
from one of them */
826
for(process *proc = process_list; proc ; proc = proc->next){
1141
for(plugin *proc = plugin_list; proc != NULL;){
827
1142
/* Is this process completely done? */
828
if(proc->eof and proc->completed){
1143
if(proc->completed and proc->eof){
829
1144
/* Only accept the plugin output if it exited cleanly */
830
1145
if(not WIFEXITED(proc->status)
831
1146
or WEXITSTATUS(proc->status) != 0){
832
1147
/* Bad exit by plugin */
1148
833
1149
if(debug){
834
1150
if(WIFEXITED(proc->status)){
835
fprintf(stderr, "Plugin %u exited with status %d\n",
836
(unsigned int) (proc->pid),
1151
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1152
" status %d\n", proc->name,
1153
(intmax_t) (proc->pid),
837
1154
WEXITSTATUS(proc->status));
838
} else if(WIFSIGNALED(proc->status)) {
839
fprintf(stderr, "Plugin %u killed by signal %d\n",
840
(unsigned int) (proc->pid),
841
WTERMSIG(proc->status));
842
} else if(WCOREDUMP(proc->status)){
843
fprintf(stderr, "Plugin %d dumped core\n",
844
(unsigned int) (proc->pid));
1155
} else if(WIFSIGNALED(proc->status)){
1156
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1157
" signal %d: %s\n", proc->name,
1158
(intmax_t) (proc->pid),
1159
WTERMSIG(proc->status),
1160
strsignal(WTERMSIG(proc->status)));
845
1161
}
846
1162
}
1163
847
1164
/* Remove the plugin */
848
1165
FD_CLR(proc->fd, &rfds_all);
1166
849
1167
/* Block signal while modifying process_list */
850
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1169
(SIG_BLOCK,
1170
&sigchld_action.sa_mask,
1171
NULL));
851
1172
if(ret < 0){
852
perror("sigprocmask");
853
exitstatus = EXIT_FAILURE;
1173
error(0, errno, "sigprocmask");
1174
exitstatus = EX_OSERR;
854
1175
goto fallback;
855
1176
}
856
/* Delete this process entry from the list */
857
if(process_list == proc){
858
/* First one - simple */
859
process_list = proc->next;
860
} else {
861
/* Second one or later */
862
for(process *p = process_list; p != NULL; p = p->next){
863
if(p->next == proc){
864
p->next = proc->next;
865
break;
866
}
867
}
868
}
1177
1178
plugin *next_plugin = proc->next;
1179
free_plugin(proc);
1180
proc = next_plugin;
1181
869
1182
/* We are done modifying process list, so unblock signal */
870
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
871
NULL);
1183
ret = (int)(TEMP_FAILURE_RETRY
1184
(sigprocmask(SIG_UNBLOCK,
1185
&sigchld_action.sa_mask, NULL)));
872
1186
if(ret < 0){
873
perror("sigprocmask");
874
}
875
free(proc->buffer);
876
free(proc);
877
/* We deleted this process from the list, so we can't go
878
proc->next. Therefore, start over from the beginning of
879
the process list */
880
break;
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
1189
goto fallback;
1190
}
1191
1192
if(plugin_list == NULL){
1193
break;
1194
}
1195
1196
continue;
881
1197
}
1198
882
1199
/* This process exited nicely, so print its buffer */
883
1200
884
1201
bool bret = print_out_password(proc->buffer,
885
1202
proc->buffer_length);
886
1203
if(not bret){
887
perror("print_out_password");
888
exitstatus = EXIT_FAILURE;
1204
error(0, errno, "print_out_password");
1205
exitstatus = EX_IOERR;
889
1206
}
890
1207
goto fallback;
891
1208
}
1209
892
1210
/* This process has not completed. Does it have any output? */
893
1211
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
894
1212
/* This process had nothing to say at this time */
1213
proc = proc->next;
895
1214
continue;
896
1215
}
897
1216
/* Before reading, make the process' data buffer large enough */
898
1217
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
899
proc->buffer = realloc(proc->buffer, proc->buffer_size
900
+ (size_t) BUFFER_SIZE);
901
if (proc->buffer == NULL){
902
perror("malloc");
903
exitstatus = EXIT_FAILURE;
1218
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1219
+ (size_t) BUFFER_SIZE);
1220
if(new_buffer == NULL){
1221
error(0, errno, "malloc");
1222
exitstatus = EX_OSERR;
904
1223
goto fallback;
905
1224
}
1225
proc->buffer = new_buffer;
906
1226
proc->buffer_size += BUFFER_SIZE;
907
1227
}
908
1228
/* Read from the process */
909
ret = read(proc->fd, proc->buffer + proc->buffer_length,
910
BUFFER_SIZE);
911
if(ret < 0){
1229
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1230
proc->buffer
1231
+ proc->buffer_length,
1232
BUFFER_SIZE));
1233
if(sret < 0){
912
1234
/* Read error from this process; ignore the error */
1235
proc = proc->next;
913
1236
continue;
914
1237
}
915
if(ret == 0){
1238
if(sret == 0){
916
1239
/* got EOF */
917
1240
proc->eof = true;
918
1241
} else {
919
proc->buffer_length += (size_t) ret;
1242
proc->buffer_length += (size_t) sret;
920
1243
}
921
1244
}
922
1245
}
923
924
1246
1247
925
1248
fallback:
926
1249
927
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1250
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1251
and exitstatus != EX_OK)){
928
1252
/* Fallback if all plugins failed, none are found or an error
929
1253
occured */
930
1254
bool bret;
931
1255
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
932
1256
char *passwordbuffer = getpass("Password: ");
933
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1257
size_t len = strlen(passwordbuffer);
1258
/* Strip trailing newline */
1259
if(len > 0 and passwordbuffer[len-1] == '\n'){
1260
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1261
len--;
1262
}
1263
bret = print_out_password(passwordbuffer, len);
934
1264
if(not bret){
935
perror("print_out_password");
936
exitstatus = EXIT_FAILURE;
1265
error(0, errno, "print_out_password");
1266
exitstatus = EX_IOERR;
937
1267
}
938
1268
}
939
1269
940
1270
/* Restore old signal handler */
941
1271
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
942
1272
if(ret == -1){
943
perror("sigaction");
944
exitstatus = EXIT_FAILURE;
1273
error(0, errno, "sigaction");
1274
exitstatus = EX_OSERR;
945
1275
}
946
1276
947
1277
if(custom_argv != NULL){
948
for(char **arg = custom_argv; *arg != NULL; arg++){
1278
for(char **arg = custom_argv+1; *arg != NULL; arg++){
949
1279
free(*arg);
950
1280
}
951
1281
free(custom_argv);
952
1282
}
953
free_plugin_list(plugin_list);
954
955
if(dir != NULL){
956
closedir(dir);
1283
1284
free(direntries);
1285
1286
if(dir_fd != -1){
1287
close(dir_fd);
957
1288
}
958
1289
959
/* Free the process list and kill the processes */
960
for(process *next; process_list != NULL; process_list = next){
961
next = process_list->next;
962
close(process_list->fd);
963
ret = kill(process_list->pid, SIGTERM);
964
if(ret == -1 and errno != ESRCH){
965
/* set-uid proccesses migth not get closed */
966
perror("kill");
1290
/* Kill the processes */
1291
for(plugin *p = plugin_list; p != NULL; p = p->next){
1292
if(p->pid != 0){
1293
close(p->fd);
1294
ret = kill(p->pid, SIGTERM);
1295
if(ret == -1 and errno != ESRCH){
1296
/* Set-uid proccesses might not get closed */
1297
error(0, errno, "kill");
1298
}
967
1299
}
968
free(process_list->buffer);
969
free(process_list);
970
1300
}
971
1301
972
1302
/* Wait for any remaining child processes to terminate */
973
do{
1303
do {
974
1304
ret = wait(NULL);
975
1305
} while(ret >= 0);
976
1306
if(errno != ECHILD){
977
perror("wait");
1307
error(0, errno, "wait");
978
1308
}
979
1309
1310
free_plugin_list();
1311
1312
free(plugindir);
1313
free(pluginhelperdir);
1314
free(argfile);
1315
980
1316
return exitstatus;
981
1317
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0