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- Committer: Teddy Hogeborn
- Date: 2008-09-05 18:37:28 UTC
- Revision ID: teddy@fukt.bsnet.se-20080905183728-l0m8v3vqa302uwrw
* mandos (main): Use EAFP with pidfile.
- files added:
- .bzrignore
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- plugins.d/mandosclient.c => plugins.d/password-request.c
- files modified:
- Makefile
added
removed
plugin-runner.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
27
stderr, STDOUT_FILENO */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#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() */
28
42
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
34
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
readdir(), closedir(), dirfd() */
37
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
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() */
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
48
55
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
52
53
struct process;
54
55
typedef struct process{
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
66
67
#define BUFFER_SIZE 256
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
76
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
84
85
/* Variables used for running processes*/
56
86
pid_t pid;
57
87
int fd;
58
88
char *buffer;
59
89
size_t buffer_size;
60
90
size_t buffer_length;
61
91
bool eof;
62
bool completed;
63
int status;
64
struct process *next;
65
} process;
66
67
typedef struct plugin{
68
char *name; /* can be NULL or any plugin name */
69
char **argv;
70
int argc;
71
bool disabled;
92
volatile bool completed;
93
volatile int status;
72
94
struct plugin *next;
73
95
} plugin;
74
96
75
plugin *getplugin(char *name, plugin **plugin_list){
76
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
77
104
if ((p->name == name)
78
105
or (p->name and name and (strcmp(p->name, name) == 0))){
79
106
return p;
82
109
/* Create a new plugin */
83
110
plugin *new_plugin = malloc(sizeof(plugin));
84
111
if (new_plugin == NULL){
85
perror("malloc");
86
exit(EXIT_FAILURE);
87
}
88
new_plugin->name = name;
112
return NULL;
113
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
120
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
89
127
new_plugin->argv = malloc(sizeof(char *) * 2);
90
128
if (new_plugin->argv == NULL){
91
perror("malloc");
92
exit(EXIT_FAILURE);
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
93
132
}
94
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
95
134
new_plugin->argv[1] = NULL;
96
new_plugin->argc = 1;
97
new_plugin->disabled = false;
98
new_plugin->next = *plugin_list;
135
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
138
free(copy_name);
139
free(new_plugin->argv);
140
free(new_plugin);
141
return NULL;
142
}
143
new_plugin->environ[0] = NULL;
144
99
145
/* Append the new plugin to the list */
100
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
101
147
return new_plugin;
102
148
}
103
149
104
void addargument(plugin *p, char *arg){
105
p->argv[p->argc] = arg;
106
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
107
if (p->argv == NULL){
108
perror("malloc");
109
exit(EXIT_FAILURE);
110
}
111
p->argc++;
112
p->argv[p->argc] = NULL;
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
152
int *len){
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
156
/* Malloc check */
157
if(*array == NULL){
158
return false;
159
}
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
162
if(copy == NULL){
163
return false;
164
}
165
/* Insert the copy */
166
(*array)[*len] = copy;
167
(*len)++;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
170
return true;
171
}
172
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
175
if(p == NULL){
176
return false;
177
}
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
179
}
180
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
183
if(p == NULL){
184
return false;
185
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
return add_to_char_array(def, &(p->environ), &(p->envc));
113
204
}
114
205
115
206
/*
117
208
* Descriptor Flags".
118
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
119
210
*/
120
int set_cloexec_flag(int fd)
211
static int set_cloexec_flag(int fd)
121
212
{
122
213
int ret = fcntl(fd, F_GETFD, 0);
123
214
/* If reading the flags failed, return error indication now. */
128
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
129
220
}
130
221
131
#define BUFFER_SIZE 256
132
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
136
process *process_list = NULL;
137
138
/* Mark a process as completed when it exits, and save its exit
222
223
/* Mark processes as completed when they exit, and save their exit
139
224
status. */
140
225
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
proc->completed = true;
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
253
}
254
255
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
261
for(size_t written = 0; written < length; written += (size_t)ret){
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
length - written));
264
if(ret < 0){
265
return false;
266
}
267
}
268
return true;
269
}
270
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
295
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
153
305
}
154
306
155
307
int main(int argc, char *argv[]){
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
157
311
size_t d_name_len;
158
312
DIR *dir = NULL;
159
313
struct dirent *dirst;
160
314
struct stat st;
161
315
fd_set rfds_all;
162
316
int ret, maxfd = 0;
317
uid_t uid = 65534;
318
gid_t gid = 65534;
163
319
bool debug = false;
164
320
int exitstatus = EXIT_SUCCESS;
321
struct sigaction old_sigchld_action;
322
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
323
.sa_flags = SA_NOCLDSTOP };
324
char **custom_argv = NULL;
325
int custom_argc = 0;
165
326
166
327
/* Establish a signal handler */
167
struct sigaction old_sigchld_action,
168
sigchld_action = { .sa_handler = handle_sigchld,
169
.sa_flags = SA_NOCLDSTOP };
170
328
sigemptyset(&sigchld_action.sa_mask);
171
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
172
if(ret < 0){
330
if(ret == -1){
173
331
perror("sigaddset");
174
exit(EXIT_FAILURE);
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
175
334
}
176
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
177
if(ret < 0){
336
if(ret == -1){
178
337
perror("sigaction");
179
exit(EXIT_FAILURE);
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
180
340
}
181
341
182
342
/* The options we understand. */
184
344
{ .name = "global-options", .key = 'g',
185
345
.arg = "OPTION[,OPTION[,...]]",
186
346
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'G',
348
.arg = "VAR=value",
349
.doc = "Environment variable passed to all plugins" },
187
350
{ .name = "options-for", .key = 'o',
188
351
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
189
352
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'E',
354
.arg = "PLUGIN:ENV=value",
355
.doc = "Environment variable passed to specified plugin" },
190
356
{ .name = "disable", .key = 'd',
191
357
.arg = "PLUGIN",
192
358
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "enable", .key = 'e',
360
.arg = "PLUGIN",
361
.doc = "Enable a specific plugin", .group = 1 },
193
362
{ .name = "plugin-dir", .key = 128,
194
363
.arg = "DIRECTORY",
195
364
.doc = "Specify a different plugin directory", .group = 2 },
196
{ .name = "debug", .key = 129,
197
.doc = "Debug mode", .group = 3 },
365
{ .name = "config-file", .key = 129,
366
.arg = "FILE",
367
.doc = "Specify a different configuration file", .group = 2 },
368
{ .name = "userid", .key = 130,
369
.arg = "ID", .flags = 0,
370
.doc = "User ID the plugins will run as", .group = 3 },
371
{ .name = "groupid", .key = 131,
372
.arg = "ID", .flags = 0,
373
.doc = "Group ID the plugins will run as", .group = 3 },
374
{ .name = "debug", .key = 132,
375
.doc = "Debug mode", .group = 4 },
198
376
{ .name = NULL }
199
377
};
200
378
201
error_t parse_opt (int key, char *arg, struct argp_state *state) {
202
/* Get the INPUT argument from `argp_parse', which we know is a
203
pointer to our plugin list pointer. */
204
plugin **plugins = state->input;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
205
381
switch (key) {
206
case 'g':
207
if (arg != NULL){
208
char *p = strtok(arg, ",");
209
do{
210
addargument(getplugin(NULL, plugins), p);
211
p = strtok(NULL, ",");
212
} while (p);
213
}
214
break;
215
case 'o':
216
if (arg != NULL){
217
char *name = strtok(arg, ":");
218
char *p = strtok(NULL, ":");
219
if(p){
220
p = strtok(p, ",");
221
do{
222
addargument(getplugin(name, plugins), p);
223
p = strtok(NULL, ",");
224
} while (p);
225
}
226
}
227
break;
228
case 'd':
229
if (arg != NULL){
230
getplugin(arg, plugins)->disabled = true;
231
}
232
break;
233
case 128:
234
plugindir = arg;
235
break;
236
case 129:
382
case 'g': /* --global-options */
383
if (arg != NULL){
384
char *p;
385
while((p = strsep(&arg, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(NULL), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
392
}
393
}
394
}
395
break;
396
case 'G': /* --global-env */
397
if(arg == NULL){
398
break;
399
}
400
{
401
char *envdef = strdup(arg);
402
if(envdef == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), envdef, true)){
406
perror("add_environment");
407
}
408
}
409
break;
410
case 'o': /* --options-for */
411
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0' or arg == NULL){
414
break;
415
}
416
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0' or opt == NULL){
418
break;
419
}
420
char *p;
421
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
423
continue;
424
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
428
}
429
}
430
}
431
break;
432
case 'E': /* --env-for */
433
if(arg == NULL){
434
break;
435
}
436
{
437
char *envdef = strchr(arg, ':');
438
if(envdef == NULL){
439
break;
440
}
441
char *p_name = strndup(arg, (size_t) (envdef-arg));
442
if(p_name == NULL){
443
break;
444
}
445
envdef++;
446
if(not add_environment(getplugin(p_name), envdef, true)){
447
perror("add_environment");
448
}
449
}
450
break;
451
case 'd': /* --disable */
452
if (arg != NULL){
453
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
456
}
457
p->disabled = true;
458
}
459
break;
460
case 'e': /* --enable */
461
if (arg != NULL){
462
plugin *p = getplugin(arg);
463
if(p == NULL){
464
return ARGP_ERR_UNKNOWN;
465
}
466
p->disabled = false;
467
}
468
break;
469
case 128: /* --plugin-dir */
470
plugindir = strdup(arg);
471
if(plugindir == NULL){
472
perror("strdup");
473
}
474
break;
475
case 129: /* --config-file */
476
/* This is already done by parse_opt_config_file() */
477
break;
478
case 130: /* --userid */
479
uid = (uid_t)strtol(arg, NULL, 10);
480
break;
481
case 131: /* --groupid */
482
gid = (gid_t)strtol(arg, NULL, 10);
483
break;
484
case 132: /* --debug */
237
485
debug = true;
238
486
break;
239
487
case ARGP_KEY_ARG:
240
argp_usage (state);
241
break;
242
case ARGP_KEY_END:
243
break;
244
default:
245
return ARGP_ERR_UNKNOWN;
246
}
247
return 0;
248
}
249
250
plugin *plugin_list = NULL;
251
252
struct argp argp = { .options = options, .parser = parse_opt,
488
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
489
break;
490
case ARGP_KEY_END:
491
break;
492
default:
493
return ARGP_ERR_UNKNOWN;
494
}
495
return 0;
496
}
497
498
/* This option parser is the same as parse_opt() above, except it
499
ignores everything but the --config-file option. */
500
error_t parse_opt_config_file (int key, char *arg,
501
__attribute__((unused))
502
struct argp_state *state) {
503
switch (key) {
504
case 'g': /* --global-options */
505
case 'G': /* --global-env */
506
case 'o': /* --options-for */
507
case 'E': /* --env-for */
508
case 'd': /* --disable */
509
case 'e': /* --enable */
510
case 128: /* --plugin-dir */
511
break;
512
case 129: /* --config-file */
513
argfile = strdup(arg);
514
if(argfile == NULL){
515
perror("strdup");
516
}
517
break;
518
case 130: /* --userid */
519
case 131: /* --groupid */
520
case 132: /* --debug */
521
case ARGP_KEY_ARG:
522
case ARGP_KEY_END:
523
break;
524
default:
525
return ARGP_ERR_UNKNOWN;
526
}
527
return 0;
528
}
529
530
struct argp argp = { .options = options,
531
.parser = parse_opt_config_file,
253
532
.args_doc = "",
254
533
.doc = "Mandos plugin runner -- Run plugins" };
255
534
256
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
535
/* Parse using the parse_opt_config_file in order to get the custom
536
config file location, if any. */
537
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
538
if (ret == ARGP_ERR_UNKNOWN){
539
fprintf(stderr, "Unknown error while parsing arguments\n");
540
exitstatus = EXIT_FAILURE;
541
goto fallback;
542
}
543
544
/* Reset to the normal argument parser */
545
argp.parser = parse_opt;
546
547
/* Open the configfile if available */
548
if (argfile == NULL){
549
conffp = fopen(AFILE, "r");
550
} else {
551
conffp = fopen(argfile, "r");
552
}
553
if(conffp != NULL){
554
char *org_line = NULL;
555
char *p, *arg, *new_arg, *line;
556
size_t size = 0;
557
ssize_t sret;
558
const char whitespace_delims[] = " \r\t\f\v\n";
559
const char comment_delim[] = "#";
560
561
custom_argc = 1;
562
custom_argv = malloc(sizeof(char*) * 2);
563
if(custom_argv == NULL){
564
perror("malloc");
565
exitstatus = EXIT_FAILURE;
566
goto fallback;
567
}
568
custom_argv[0] = argv[0];
569
custom_argv[1] = NULL;
570
571
/* for each line in the config file, strip whitespace and ignore
572
commented text */
573
while(true){
574
sret = getline(&org_line, &size, conffp);
575
if(sret == -1){
576
break;
577
}
578
579
line = org_line;
580
arg = strsep(&line, comment_delim);
581
while((p = strsep(&arg, whitespace_delims)) != NULL){
582
if(p[0] == '\0'){
583
continue;
584
}
585
new_arg = strdup(p);
586
if(new_arg == NULL){
587
perror("strdup");
588
exitstatus = EXIT_FAILURE;
589
free(org_line);
590
goto fallback;
591
}
592
593
custom_argc += 1;
594
custom_argv = realloc(custom_argv, sizeof(char *)
595
* ((unsigned int) custom_argc + 1));
596
if(custom_argv == NULL){
597
perror("realloc");
598
exitstatus = EXIT_FAILURE;
599
free(org_line);
600
goto fallback;
601
}
602
custom_argv[custom_argc-1] = new_arg;
603
custom_argv[custom_argc] = NULL;
604
}
605
}
606
free(org_line);
607
} else {
608
/* Check for harmful errors and go to fallback. Other errors might
609
not affect opening plugins */
610
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
611
perror("fopen");
612
exitstatus = EXIT_FAILURE;
613
goto fallback;
614
}
615
}
616
/* If there was any arguments from configuration file,
617
pass them to parser as command arguments */
618
if(custom_argv != NULL){
619
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
620
0, NULL);
621
if (ret == ARGP_ERR_UNKNOWN){
622
fprintf(stderr, "Unknown error while parsing arguments\n");
623
exitstatus = EXIT_FAILURE;
624
goto fallback;
625
}
626
}
627
628
/* Parse actual command line arguments, to let them override the
629
config file */
630
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
631
if (ret == ARGP_ERR_UNKNOWN){
632
fprintf(stderr, "Unknown error while parsing arguments\n");
633
exitstatus = EXIT_FAILURE;
634
goto fallback;
635
}
257
636
258
637
if(debug){
259
638
for(plugin *p = plugin_list; p != NULL; p=p->next){
262
641
for(char **a = p->argv; *a != NULL; a++){
263
642
fprintf(stderr, "\tArg: %s\n", *a);
264
643
}
644
fprintf(stderr, "...and %u environment variables\n", p->envc);
645
for(char **a = p->environ; *a != NULL; a++){
646
fprintf(stderr, "\t%s\n", *a);
647
}
265
648
}
266
649
}
267
650
268
dir = opendir(plugindir);
651
/* Strip permissions down to nobody */
652
ret = setuid(uid);
653
if (ret == -1){
654
perror("setuid");
655
}
656
setgid(gid);
657
if (ret == -1){
658
perror("setgid");
659
}
660
661
if (plugindir == NULL){
662
dir = opendir(PDIR);
663
} else {
664
dir = opendir(plugindir);
665
}
666
269
667
if(dir == NULL){
270
668
perror("Could not open plugin dir");
271
669
exitstatus = EXIT_FAILURE;
272
goto end;
670
goto fallback;
273
671
}
274
672
275
673
/* Set the FD_CLOEXEC flag on the directory, if possible */
280
678
if(ret < 0){
281
679
perror("set_cloexec_flag");
282
680
exitstatus = EXIT_FAILURE;
283
goto end;
681
goto fallback;
284
682
}
285
683
}
286
684
}
287
685
288
686
FD_ZERO(&rfds_all);
289
687
688
/* Read and execute any executable in the plugin directory*/
290
689
while(true){
291
690
dirst = readdir(dir);
292
691
293
// All directory entries have been processed
692
/* All directory entries have been processed */
294
693
if(dirst == NULL){
694
if (errno == EBADF){
695
perror("readdir");
696
exitstatus = EXIT_FAILURE;
697
goto fallback;
698
}
295
699
break;
296
700
}
297
701
298
702
d_name_len = strlen(dirst->d_name);
299
703
300
// Ignore dotfiles, backup files and other junk
704
/* Ignore dotfiles, backup files and other junk */
301
705
{
302
706
bool bad_name = false;
303
707
318
722
break;
319
723
}
320
724
}
321
322
725
if(bad_name){
323
726
continue;
324
727
}
325
326
728
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
327
729
size_t suf_len = strlen(*suf);
328
730
if((d_name_len >= suf_len)
341
743
continue;
342
744
}
343
745
}
344
345
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
346
if (filename == NULL){
347
perror("malloc");
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
351
strcpy(filename, plugindir); /* Spurious warning */
352
strcat(filename, "/"); /* Spurious warning */
353
strcat(filename, dirst->d_name); /* Spurious warning */
354
355
stat(filename, &st);
356
746
747
char *filename;
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
749
if(ret < 0){
750
perror("asprintf");
751
continue;
752
}
753
754
ret = stat(filename, &st);
755
if (ret == -1){
756
perror("stat");
757
free(filename);
758
continue;
759
}
760
761
/* Ignore non-executable files */
357
762
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
358
763
if(debug){
359
764
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
362
767
free(filename);
363
768
continue;
364
769
}
365
if(getplugin(dirst->d_name, &plugin_list)->disabled){
770
771
plugin *p = getplugin(dirst->d_name);
772
if(p == NULL){
773
perror("getplugin");
774
free(filename);
775
continue;
776
}
777
if(p->disabled){
366
778
if(debug){
367
779
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
368
780
dirst->d_name);
370
782
free(filename);
371
783
continue;
372
784
}
373
plugin *p = getplugin(dirst->d_name, &plugin_list);
374
785
{
375
786
/* Add global arguments to argument list for this plugin */
376
plugin *g = getplugin(NULL, &plugin_list);
377
for(char **a = g->argv + 1; *a != NULL; a++){
378
addargument(p, *a);
379
}
380
}
381
int pipefd[2];
787
plugin *g = getplugin(NULL);
788
if(g != NULL){
789
for(char **a = g->argv + 1; *a != NULL; a++){
790
if(not add_argument(p, *a)){
791
perror("add_argument");
792
}
793
}
794
/* Add global environment variables */
795
for(char **e = g->environ; *e != NULL; e++){
796
if(not add_environment(p, *e, false)){
797
perror("add_environment");
798
}
799
}
800
}
801
}
802
/* If this plugin has any environment variables, we will call
803
using execve and need to duplicate the environment from this
804
process, too. */
805
if(p->environ[0] != NULL){
806
for(char **e = environ; *e != NULL; e++){
807
if(not add_environment(p, *e, false)){
808
perror("add_environment");
809
}
810
}
811
}
812
813
int pipefd[2];
382
814
ret = pipe(pipefd);
383
815
if (ret == -1){
384
816
perror("pipe");
385
817
exitstatus = EXIT_FAILURE;
386
goto end;
818
goto fallback;
387
819
}
820
/* Ask OS to automatic close the pipe on exec */
388
821
ret = set_cloexec_flag(pipefd[0]);
389
822
if(ret < 0){
390
823
perror("set_cloexec_flag");
391
824
exitstatus = EXIT_FAILURE;
392
goto end;
825
goto fallback;
393
826
}
394
827
ret = set_cloexec_flag(pipefd[1]);
395
828
if(ret < 0){
396
829
perror("set_cloexec_flag");
397
830
exitstatus = EXIT_FAILURE;
398
goto end;
831
goto fallback;
399
832
}
400
833
/* Block SIGCHLD until process is safely in process list */
401
834
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
402
835
if(ret < 0){
403
836
perror("sigprocmask");
404
837
exitstatus = EXIT_FAILURE;
405
goto end;
838
goto fallback;
406
839
}
407
// Starting a new process to be watched
840
/* Starting a new process to be watched */
408
841
pid_t pid = fork();
842
if(pid == -1){
843
perror("fork");
844
exitstatus = EXIT_FAILURE;
845
goto fallback;
846
}
409
847
if(pid == 0){
410
848
/* this is the child process */
411
849
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
418
856
perror("sigprocmask");
419
857
_exit(EXIT_FAILURE);
420
858
}
421
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
859
860
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
861
if(ret == -1){
862
perror("dup2");
863
_exit(EXIT_FAILURE);
864
}
422
865
423
866
if(dirfd(dir) < 0){
424
867
/* If dir has no file descriptor, we could not set FD_CLOEXEC
425
868
above and must now close it manually here. */
426
869
closedir(dir);
427
870
}
428
if(execv(filename, p->argv) < 0){
429
perror("execv");
430
_exit(EXIT_FAILURE);
871
if(p->environ[0] == NULL){
872
if(execv(filename, p->argv) < 0){
873
perror("execv");
874
_exit(EXIT_FAILURE);
875
}
876
} else {
877
if(execve(filename, p->argv, p->environ) < 0){
878
perror("execve");
879
_exit(EXIT_FAILURE);
880
}
431
881
}
432
882
/* no return */
433
883
}
434
/* parent process */
884
/* Parent process */
885
close(pipefd[1]); /* Close unused write end of pipe */
435
886
free(filename);
436
close(pipefd[1]); /* close unused write end of pipe */
437
process *new_process = malloc(sizeof(process));
438
if (new_process == NULL){
439
perror("malloc");
887
plugin *new_plugin = getplugin(dirst->d_name);
888
if (new_plugin == NULL){
889
perror("getplugin");
440
890
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
441
891
if(ret < 0){
442
perror("sigprocmask");
892
perror("sigprocmask");
443
893
}
444
894
exitstatus = EXIT_FAILURE;
445
goto end;
895
goto fallback;
446
896
}
447
897
448
*new_process = (struct process){ .pid = pid,
449
.fd = pipefd[0],
450
.next = process_list };
451
// List handling
452
process_list = new_process;
898
new_plugin->pid = pid;
899
new_plugin->fd = pipefd[0];
900
453
901
/* Unblock SIGCHLD so signal handler can be run if this process
454
902
has already completed */
455
903
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
456
904
if(ret < 0){
457
905
perror("sigprocmask");
458
906
exitstatus = EXIT_FAILURE;
459
goto end;
460
}
461
462
FD_SET(new_process->fd, &rfds_all);
463
464
if (maxfd < new_process->fd){
465
maxfd = new_process->fd;
466
}
467
468
}
469
470
/* Free the plugin list */
471
for(plugin *next; plugin_list != NULL; plugin_list = next){
472
next = plugin_list->next;
473
free(plugin_list->argv);
474
free(plugin_list);
907
goto fallback;
908
}
909
910
FD_SET(new_plugin->fd, &rfds_all);
911
912
if (maxfd < new_plugin->fd){
913
maxfd = new_plugin->fd;
914
}
915
475
916
}
476
917
477
918
closedir(dir);
478
919
dir = NULL;
479
480
if (process_list == NULL){
481
fprintf(stderr, "No plugin processes started, exiting\n");
482
exitstatus = EXIT_FAILURE;
483
goto end;
920
921
for(plugin *p = plugin_list; p != NULL; p = p->next){
922
if(p->pid != 0){
923
break;
924
}
925
if(p->next == NULL){
926
fprintf(stderr, "No plugin processes started. Incorrect plugin"
927
" directory?\n");
928
free_plugin_list();
929
}
484
930
}
485
while(process_list){
931
932
/* Main loop while running plugins exist */
933
while(plugin_list){
486
934
fd_set rfds = rfds_all;
487
935
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
488
936
if (select_ret == -1){
489
937
perror("select");
490
938
exitstatus = EXIT_FAILURE;
491
goto end;
939
goto fallback;
492
940
}
493
941
/* OK, now either a process completed, or something can be read
494
942
from one of them */
495
for(process *proc = process_list; proc ; proc = proc->next){
943
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
496
944
/* Is this process completely done? */
497
945
if(proc->eof and proc->completed){
498
946
/* Only accept the plugin output if it exited cleanly */
499
947
if(not WIFEXITED(proc->status)
500
948
or WEXITSTATUS(proc->status) != 0){
501
949
/* Bad exit by plugin */
950
502
951
if(debug){
503
952
if(WIFEXITED(proc->status)){
504
fprintf(stderr, "Plugin %d exited with status %d\n",
505
proc->pid, WEXITSTATUS(proc->status));
953
fprintf(stderr, "Plugin %u exited with status %d\n",
954
(unsigned int) (proc->pid),
955
WEXITSTATUS(proc->status));
506
956
} else if(WIFSIGNALED(proc->status)) {
507
fprintf(stderr, "Plugin %d killed by signal %d\n",
508
proc->pid, WTERMSIG(proc->status));
957
fprintf(stderr, "Plugin %u killed by signal %d\n",
958
(unsigned int) (proc->pid),
959
WTERMSIG(proc->status));
509
960
} else if(WCOREDUMP(proc->status)){
510
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
961
fprintf(stderr, "Plugin %d dumped core\n",
962
(unsigned int) (proc->pid));
511
963
}
512
964
}
965
513
966
/* Remove the plugin */
514
967
FD_CLR(proc->fd, &rfds_all);
968
515
969
/* Block signal while modifying process_list */
516
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
970
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
517
971
if(ret < 0){
518
972
perror("sigprocmask");
519
973
exitstatus = EXIT_FAILURE;
520
goto end;
521
}
522
/* Delete this process entry from the list */
523
if(process_list == proc){
524
/* First one - simple */
525
process_list = proc->next;
526
} else {
527
/* Second one or later */
528
for(process *p = process_list; p != NULL; p = p->next){
529
if(p->next == proc){
530
p->next = proc->next;
531
break;
532
}
533
}
534
}
974
goto fallback;
975
}
976
free_plugin(proc);
535
977
/* We are done modifying process list, so unblock signal */
536
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
537
979
NULL);
538
980
if(ret < 0){
539
981
perror("sigprocmask");
540
}
541
free(proc->buffer);
542
free(proc);
543
/* We deleted this process from the list, so we can't go
544
proc->next. Therefore, start over from the beginning of
545
the process list */
546
break;
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
continue;
547
990
}
991
548
992
/* This process exited nicely, so print its buffer */
549
for(size_t written = 0; written < proc->buffer_length;
550
written += (size_t)ret){
551
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
552
proc->buffer + written,
553
proc->buffer_length
554
- written));
555
if(ret < 0){
556
perror("write");
557
exitstatus = EXIT_FAILURE;
558
goto end;
559
}
993
994
bool bret = print_out_password(proc->buffer,
995
proc->buffer_length);
996
if(not bret){
997
perror("print_out_password");
998
exitstatus = EXIT_FAILURE;
560
999
}
561
goto end;
1000
goto fallback;
562
1001
}
1002
563
1003
/* This process has not completed. Does it have any output? */
564
1004
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
565
1005
/* This process had nothing to say at this time */
572
1012
if (proc->buffer == NULL){
573
1013
perror("malloc");
574
1014
exitstatus = EXIT_FAILURE;
575
goto end;
1015
goto fallback;
576
1016
}
577
1017
proc->buffer_size += BUFFER_SIZE;
578
1018
}
591
1031
}
592
1032
}
593
1033
}
594
if(process_list == NULL){
595
fprintf(stderr, "All plugin processes failed, exiting\n");
596
exitstatus = EXIT_FAILURE;
1034
1035
1036
fallback:
1037
1038
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1039
/* Fallback if all plugins failed, none are found or an error
1040
occured */
1041
bool bret;
1042
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1043
char *passwordbuffer = getpass("Password: ");
1044
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1045
if(not bret){
1046
perror("print_out_password");
1047
exitstatus = EXIT_FAILURE;
1048
}
597
1049
}
598
1050
599
end:
600
1051
/* Restore old signal handler */
601
sigaction(SIGCHLD, &old_sigchld_action, NULL);
602
603
/* Free the plugin list */
604
for(plugin *next; plugin_list != NULL; plugin_list = next){
605
next = plugin_list->next;
606
free(plugin_list->argv);
607
free(plugin_list);
1052
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1053
if(ret == -1){
1054
perror("sigaction");
1055
exitstatus = EXIT_FAILURE;
1056
}
1057
1058
if(custom_argv != NULL){
1059
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1060
free(*arg);
1061
}
1062
free(custom_argv);
608
1063
}
609
1064
610
1065
if(dir != NULL){
612
1067
}
613
1068
614
1069
/* Free the process list and kill the processes */
615
for(process *next; process_list != NULL; process_list = next){
616
next = process_list->next;
617
close(process_list->fd);
618
kill(process_list->pid, SIGTERM);
619
free(process_list->buffer);
620
free(process_list);
1070
for(plugin *p = plugin_list; p != NULL; p = p->next){
1071
if(p->pid != 0){
1072
close(p->fd);
1073
ret = kill(p->pid, SIGTERM);
1074
if(ret == -1 and errno != ESRCH){
1075
/* Set-uid proccesses might not get closed */
1076
perror("kill");
1077
}
1078
}
621
1079
}
622
1080
623
1081
/* Wait for any remaining child processes to terminate */
627
1085
if(errno != ECHILD){
628
1086
perror("wait");
629
1087
}
1088
1089
free_plugin_list();
1090
1091
free(plugindir);
1092
free(argfile);
630
1093
631
1094
return exitstatus;
632
1095
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0