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- Committer: Teddy Hogeborn
- Date: 2008-08-24 23:33:02 UTC
- mfrom: (24.1.65 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080824233302-kfu4g2pkozg7xrmz
* plugin-runner.c (process): Set "completed" and "status" as volatile.
(handle_sigchld): Bug fix: reset proc to process_list every time.
(handle_sigchld): Bug fix: reset proc to process_list every time.
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
64
SIG_UNBLOCK, kill() */
66
65
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
68
66
69
67
#define BUFFER_SIZE 256
70
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
74
const char *argp_program_version = "plugin-runner " VERSION;
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
75
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
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;
86
77
87
typedef struct plugin{
78
88
char *name; /* can be NULL or any plugin name */
79
89
char **argv;
81
91
char **environ;
82
92
int envc;
83
93
bool disabled;
84
85
/* Variables used for running processes*/
86
pid_t pid;
87
int fd;
88
char *buffer;
89
size_t buffer_size;
90
size_t buffer_length;
91
bool eof;
92
volatile sig_atomic_t completed;
93
int status;
94
94
struct plugin *next;
95
95
} plugin;
96
96
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){
104
if((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
106
101
return p;
107
102
}
108
103
}
109
104
/* Create a new plugin */
110
105
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
106
if (new_plugin == NULL){
112
107
return NULL;
113
108
}
114
109
char *copy_name = NULL;
115
110
if(name != NULL){
116
111
copy_name = strdup(name);
117
112
if(copy_name == NULL){
118
free(new_plugin);
119
113
return NULL;
120
114
}
121
115
}
122
116
123
*new_plugin = (plugin){ .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
127
122
128
123
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
124
if (new_plugin->argv == NULL){
130
125
free(copy_name);
131
126
free(new_plugin);
132
127
return NULL;
133
128
}
134
129
new_plugin->argv[0] = copy_name;
135
130
new_plugin->argv[1] = NULL;
136
131
137
132
new_plugin->environ = malloc(sizeof(char *));
138
133
if(new_plugin->environ == NULL){
139
134
free(copy_name);
142
137
return NULL;
143
138
}
144
139
new_plugin->environ[0] = NULL;
145
146
140
/* Append the new plugin to the list */
147
plugin_list = new_plugin;
141
*plugin_list = new_plugin;
148
142
return new_plugin;
149
143
}
150
144
180
174
}
181
175
182
176
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
177
static bool add_environment(plugin *p, const char *def){
184
178
if(p == NULL){
185
179
return false;
186
180
}
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
193
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
196
return false;
197
}
198
*e = new;
199
strcpy(*e, def);
200
}
201
return true;
202
}
203
}
204
181
return add_to_char_array(def, &(p->environ), &(p->envc));
205
182
}
206
183
184
207
185
/*
208
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
187
* Descriptor Flags".
210
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
189
*/
212
static int set_cloexec_flag(int fd){
190
static int set_cloexec_flag(int fd)
191
{
213
192
int ret = fcntl(fd, F_GETFD, 0);
214
193
/* If reading the flags failed, return error indication now. */
215
194
if(ret < 0){
219
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
199
}
221
200
201
process *process_list = NULL;
222
202
223
203
/* Mark processes as completed when they exit, and save their exit
224
204
status. */
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
int old_errno = errno;
205
void handle_sigchld(__attribute__((unused)) int sig){
227
206
while(true){
228
plugin *proc = plugin_list;
207
process *proc = process_list;
229
208
int status;
230
209
pid_t pid = waitpid(-1, &status, WNOHANG);
231
210
if(pid == 0){
233
212
break;
234
213
}
235
214
if(pid == -1){
236
if(errno == ECHILD){
237
/* No child processes */
238
break;
215
if (errno != ECHILD){
216
perror("waitpid");
239
217
}
240
perror("waitpid");
218
/* No child processes */
219
break;
241
220
}
242
221
243
222
/* A child exited, find it in process_list */
244
223
while(proc != NULL and proc->pid != pid){
245
224
proc = proc->next;
249
228
continue;
250
229
}
251
230
proc->status = status;
252
proc->completed = 1;
231
proc->completed = true;
253
232
}
254
errno = old_errno;
255
233
}
256
234
257
/* Prints out a password to stdout */
258
static bool print_out_password(const char *buffer, size_t length){
235
bool print_out_password(const char *buffer, size_t length){
259
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
260
240
for(size_t written = 0; written < length; written += (size_t)ret){
261
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
262
242
length - written));
267
247
return true;
268
248
}
269
249
270
/* Removes and free a plugin from the plugin list */
271
static void free_plugin(plugin *plugin_node){
272
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
274
free(*arg);
275
}
276
free(plugin_node->argv);
277
for(char **env = plugin_node->environ; *env != NULL; env++){
278
free(*env);
279
}
280
free(plugin_node->environ);
281
free(plugin_node->buffer);
282
283
/* Removes the plugin from the singly-linked list */
284
if(plugin_node == plugin_list){
285
/* First one - simple */
286
plugin_list = plugin_list->next;
287
} else {
288
/* Second one or later */
289
for(plugin *p = plugin_list; p != NULL; p = p->next){
290
if(p->next == plugin_node){
291
p->next = plugin_node->next;
292
break;
293
}
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;
294
256
}
295
}
296
297
free(plugin_node);
257
argv[0] = NULL; /* Will be set to argv[0] in main before
258
parsing */
259
argv[1] = NULL;
260
}
261
*argc += 1;
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
264
if(argv == NULL){
265
return NULL;
266
}
267
argv[*argc-1] = arg;
268
argv[*argc] = NULL;
269
return argv;
298
270
}
299
271
300
static void free_plugin_list(void){
301
while(plugin_list != NULL){
302
free_plugin(plugin_list);
272
static void free_plugin_list(plugin *plugin_list){
273
for(plugin *next; plugin_list != NULL; plugin_list = next){
274
next = plugin_list->next;
275
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
276
free(*arg);
277
}
278
free(plugin_list->argv);
279
for(char **env = plugin_list->environ; *env != NULL; env++){
280
free(*env);
281
}
282
free(plugin_list->environ);
283
free(plugin_list);
303
284
}
304
285
}
305
286
306
287
int main(int argc, char *argv[]){
307
char *plugindir = NULL;
308
char *argfile = NULL;
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
309
290
FILE *conffp;
310
291
size_t d_name_len;
311
292
DIR *dir = NULL;
312
293
struct dirent *dirst;
313
294
struct stat st;
314
295
fd_set rfds_all;
315
int ret, numchars, maxfd = 0;
316
ssize_t sret;
317
intmax_t tmpmax;
296
int ret, maxfd = 0;
318
297
uid_t uid = 65534;
319
298
gid_t gid = 65534;
320
299
bool debug = false;
345
324
{ .name = "global-options", .key = 'g',
346
325
.arg = "OPTION[,OPTION[,...]]",
347
326
.doc = "Options passed to all plugins" },
348
{ .name = "global-env", .key = 'G',
327
{ .name = "global-envs", .key = 'e',
349
328
.arg = "VAR=value",
350
329
.doc = "Environment variable passed to all plugins" },
351
330
{ .name = "options-for", .key = 'o',
352
331
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
353
332
.doc = "Options passed only to specified plugin" },
354
{ .name = "env-for", .key = 'E',
333
{ .name = "envs-for", .key = 'f',
355
334
.arg = "PLUGIN:ENV=value",
356
335
.doc = "Environment variable passed to specified plugin" },
357
336
{ .name = "disable", .key = 'd',
358
337
.arg = "PLUGIN",
359
338
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
361
.arg = "PLUGIN",
362
.doc = "Enable a specific plugin", .group = 1 },
363
339
{ .name = "plugin-dir", .key = 128,
364
340
.arg = "DIRECTORY",
365
341
.doc = "Specify a different plugin directory", .group = 2 },
366
{ .name = "config-file", .key = 129,
367
.arg = "FILE",
368
.doc = "Specify a different configuration file", .group = 2 },
369
{ .name = "userid", .key = 130,
370
.arg = "ID", .flags = 0,
371
.doc = "User ID the plugins will run as", .group = 3 },
372
{ .name = "groupid", .key = 131,
373
.arg = "ID", .flags = 0,
374
.doc = "Group ID the plugins will run as", .group = 3 },
375
{ .name = "debug", .key = 132,
376
.doc = "Debug mode", .group = 4 },
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
349
.doc = "Debug mode", .group = 3 },
377
350
{ .name = NULL }
378
351
};
379
352
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
382
switch(key){
383
case 'g': /* --global-options */
384
if(arg != NULL){
353
error_t parse_opt (int key, char *arg, struct argp_state *state) {
354
/* Get the INPUT argument from `argp_parse', which we know is a
355
pointer to our plugin list pointer. */
356
plugin **plugins = state->input;
357
switch (key) {
358
case 'g':
359
if (arg != NULL){
385
360
char *p;
386
361
while((p = strsep(&arg, ",")) != NULL){
387
362
if(p[0] == '\0'){
388
363
continue;
389
364
}
390
if(not add_argument(getplugin(NULL), p)){
365
if(not add_argument(getplugin(NULL, plugins), p)){
391
366
perror("add_argument");
392
367
return ARGP_ERR_UNKNOWN;
393
368
}
394
369
}
395
370
}
396
371
break;
397
case 'G': /* --global-env */
372
case 'e':
398
373
if(arg == NULL){
399
374
break;
400
375
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
376
{
377
char *envdef = strdup(arg);
378
if(envdef == NULL){
379
break;
380
}
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
383
}
403
384
}
404
385
break;
405
case 'o': /* --options-for */
406
if(arg != NULL){
386
case 'o':
387
if (arg != NULL){
407
388
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
389
if(p_name[0] == '\0'){
409
390
break;
410
391
}
411
392
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
393
if(opt[0] == '\0'){
413
394
break;
414
395
}
415
char *p;
416
while((p = strsep(&opt, ",")) != NULL){
417
if(p[0] == '\0'){
418
continue;
419
}
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
return ARGP_ERR_UNKNOWN;
396
if(opt != NULL){
397
char *p;
398
while((p = strsep(&opt, ",")) != NULL){
399
if(p[0] == '\0'){
400
continue;
401
}
402
if(not add_argument(getplugin(p_name, plugins), p)){
403
perror("add_argument");
404
return ARGP_ERR_UNKNOWN;
405
}
423
406
}
424
407
}
425
408
}
426
409
break;
427
case 'E': /* --env-for */
410
case 'f':
428
411
if(arg == NULL){
429
412
break;
430
413
}
433
416
if(envdef == NULL){
434
417
break;
435
418
}
436
*envdef = '\0';
437
if(not add_environment(getplugin(arg), envdef+1, true)){
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
420
if(p_name == NULL){
421
break;
422
}
423
envdef++;
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
438
425
perror("add_environment");
439
426
}
440
427
}
441
428
break;
442
case 'd': /* --disable */
443
if(arg != NULL){
444
plugin *p = getplugin(arg);
429
case 'd':
430
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
445
432
if(p == NULL){
446
433
return ARGP_ERR_UNKNOWN;
447
434
}
448
435
p->disabled = true;
449
436
}
450
437
break;
451
case 'e': /* --enable */
452
if(arg != NULL){
453
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
456
}
457
p->disabled = false;
458
}
459
break;
460
case 128: /* --plugin-dir */
461
free(plugindir);
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
466
break;
467
case 129: /* --config-file */
468
/* This is already done by parse_opt_config_file() */
469
break;
470
case 130: /* --userid */
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
476
} else {
477
uid = (uid_t)tmpmax;
478
}
479
break;
480
case 131: /* --groupid */
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
486
} else {
487
gid = (gid_t)tmpmax;
488
}
489
break;
490
case 132: /* --debug */
438
case 128:
439
plugindir = arg;
440
break;
441
case 129:
442
uid = (uid_t)strtol(arg, NULL, 10);
443
break;
444
case 130:
445
gid = (gid_t)strtol(arg, NULL, 10);
446
break;
447
case 131:
491
448
debug = true;
492
449
break;
493
/*
494
* When adding more options before this line, remember to also add a
495
* "case" to the "parse_opt_config_file" function below.
496
*/
497
case ARGP_KEY_ARG:
498
/* Cryptsetup always passes an argument, which is an empty
499
string if "none" was specified in /etc/crypttab. So if
500
argument was empty, we ignore it silently. */
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
503
}
504
break;
505
case ARGP_KEY_END:
506
break;
507
default:
508
return ARGP_ERR_UNKNOWN;
509
}
510
return 0;
511
}
512
513
/* This option parser is the same as parse_opt() above, except it
514
ignores everything but the --config-file option. */
515
error_t parse_opt_config_file(int key, char *arg,
516
__attribute__((unused))
517
struct argp_state *state){
518
switch(key){
519
case 'g': /* --global-options */
520
case 'G': /* --global-env */
521
case 'o': /* --options-for */
522
case 'E': /* --env-for */
523
case 'd': /* --disable */
524
case 'e': /* --enable */
525
case 128: /* --plugin-dir */
526
break;
527
case 129: /* --config-file */
528
free(argfile);
529
argfile = strdup(arg);
530
if(argfile == NULL){
531
perror("strdup");
532
}
533
break;
534
case 130: /* --userid */
535
case 131: /* --groupid */
536
case 132: /* --debug */
537
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
539
break;
540
default:
541
return ARGP_ERR_UNKNOWN;
542
}
543
return 0;
544
}
545
546
struct argp argp = { .options = options,
547
.parser = parse_opt_config_file,
548
.args_doc = "",
450
case ARGP_KEY_ARG:
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
452
break;
453
case ARGP_KEY_END:
454
break;
455
default:
456
return ARGP_ERR_UNKNOWN;
457
}
458
return 0;
459
}
460
461
plugin *plugin_list = NULL;
462
463
struct argp argp = { .options = options, .parser = parse_opt,
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
549
465
.doc = "Mandos plugin runner -- Run plugins" };
550
466
551
/* Parse using parse_opt_config_file() in order to get the custom
552
config file location, if any. */
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
555
469
fprintf(stderr, "Unknown error while parsing arguments\n");
556
470
exitstatus = EXIT_FAILURE;
557
471
goto fallback;
558
472
}
559
560
/* Reset to the normal argument parser */
561
argp.parser = parse_opt;
562
563
/* Open the configfile if available */
564
if(argfile == NULL){
565
conffp = fopen(AFILE, "r");
566
} else {
567
conffp = fopen(argfile, "r");
568
}
473
474
conffp = fopen(argfile, "r");
569
475
if(conffp != NULL){
570
476
char *org_line = NULL;
571
477
char *p, *arg, *new_arg, *line;
572
478
size_t size = 0;
479
ssize_t sret;
573
480
const char whitespace_delims[] = " \r\t\f\v\n";
574
481
const char comment_delim[] = "#";
575
482
576
custom_argc = 1;
577
custom_argv = malloc(sizeof(char*) * 2);
578
if(custom_argv == NULL){
579
perror("malloc");
580
exitstatus = EXIT_FAILURE;
581
goto fallback;
582
}
583
custom_argv[0] = argv[0];
584
custom_argv[1] = NULL;
585
586
/* for each line in the config file, strip whitespace and ignore
587
commented text */
588
483
while(true){
589
484
sret = getline(&org_line, &size, conffp);
590
485
if(sret == -1){
598
493
continue;
599
494
}
600
495
new_arg = strdup(p);
601
if(new_arg == NULL){
602
perror("strdup");
603
exitstatus = EXIT_FAILURE;
604
free(org_line);
605
goto fallback;
606
}
607
608
custom_argc += 1;
609
custom_argv = realloc(custom_argv, sizeof(char *)
610
* ((unsigned int) custom_argc + 1));
611
if(custom_argv == NULL){
612
perror("realloc");
613
exitstatus = EXIT_FAILURE;
614
free(org_line);
615
goto fallback;
616
}
617
custom_argv[custom_argc-1] = new_arg;
618
custom_argv[custom_argc] = NULL;
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
500
goto fallback;
501
}
619
502
}
620
503
}
621
504
free(org_line);
622
} else {
505
} else{
623
506
/* Check for harmful errors and go to fallback. Other errors might
624
507
not affect opening plugins */
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
626
509
perror("fopen");
627
510
exitstatus = EXIT_FAILURE;
628
511
goto fallback;
629
512
}
630
513
}
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
514
633
515
if(custom_argv != NULL){
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
0, NULL);
636
if(ret == ARGP_ERR_UNKNOWN){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
518
&plugin_list);
519
if (ret == ARGP_ERR_UNKNOWN){
637
520
fprintf(stderr, "Unknown error while parsing arguments\n");
638
521
exitstatus = EXIT_FAILURE;
639
522
goto fallback;
640
523
}
641
524
}
642
525
643
/* Parse actual command line arguments, to let them override the
644
config file */
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
649
goto fallback;
650
}
651
652
526
if(debug){
653
527
for(plugin *p = plugin_list; p != NULL; p=p->next){
654
528
fprintf(stderr, "Plugin: %s has %d arguments\n",
656
530
for(char **a = p->argv; *a != NULL; a++){
657
531
fprintf(stderr, "\tArg: %s\n", *a);
658
532
}
659
fprintf(stderr, "...and %d environment variables\n", p->envc);
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
660
534
for(char **a = p->environ; *a != NULL; a++){
661
535
fprintf(stderr, "\t%s\n", *a);
662
536
}
663
537
}
664
538
}
665
539
666
/* Strip permissions down to nobody */
540
ret = setuid(uid);
541
if (ret == -1){
542
perror("setuid");
543
}
544
667
545
setgid(gid);
668
if(ret == -1){
546
if (ret == -1){
669
547
perror("setgid");
670
548
}
671
ret = setuid(uid);
672
if(ret == -1){
673
perror("setuid");
674
}
675
676
if(plugindir == NULL){
677
dir = opendir(PDIR);
678
} else {
679
dir = opendir(plugindir);
680
}
681
549
550
dir = opendir(plugindir);
682
551
if(dir == NULL){
683
552
perror("Could not open plugin dir");
684
553
exitstatus = EXIT_FAILURE;
700
569
701
570
FD_ZERO(&rfds_all);
702
571
703
/* Read and execute any executable in the plugin directory*/
704
572
while(true){
705
573
dirst = readdir(dir);
706
574
707
/* All directory entries have been processed */
575
// All directory entries have been processed
708
576
if(dirst == NULL){
709
if(errno == EBADF){
577
if (errno == EBADF){
710
578
perror("readdir");
711
579
exitstatus = EXIT_FAILURE;
712
580
goto fallback;
716
584
717
585
d_name_len = strlen(dirst->d_name);
718
586
719
/* Ignore dotfiles, backup files and other junk */
587
// Ignore dotfiles, backup files and other junk
720
588
{
721
589
bool bad_name = false;
722
590
724
592
725
593
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
726
594
".dpkg-old",
727
".dpkg-bak",
728
595
".dpkg-divert", NULL };
729
596
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
730
597
size_t pre_len = strlen(*pre);
738
605
break;
739
606
}
740
607
}
608
741
609
if(bad_name){
742
610
continue;
743
611
}
612
744
613
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
745
614
size_t suf_len = strlen(*suf);
746
615
if((d_name_len >= suf_len)
761
630
}
762
631
763
632
char *filename;
764
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
766
} else {
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
768
}
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
769
634
if(ret < 0){
770
635
perror("asprintf");
771
636
continue;
772
637
}
773
638
774
639
ret = stat(filename, &st);
775
if(ret == -1){
640
if (ret == -1){
776
641
perror("stat");
777
642
free(filename);
778
643
continue;
779
644
}
780
781
/* Ignore non-executable files */
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
645
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
783
647
if(debug){
784
648
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
649
" with bad type or mode\n", filename);
787
651
free(filename);
788
652
continue;
789
653
}
790
791
plugin *p = getplugin(dirst->d_name);
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
792
655
if(p == NULL){
793
656
perror("getplugin");
794
657
free(filename);
804
667
}
805
668
{
806
669
/* Add global arguments to argument list for this plugin */
807
plugin *g = getplugin(NULL);
670
plugin *g = getplugin(NULL, &plugin_list);
808
671
if(g != NULL){
809
672
for(char **a = g->argv + 1; *a != NULL; a++){
810
673
if(not add_argument(p, *a)){
813
676
}
814
677
/* Add global environment variables */
815
678
for(char **e = g->environ; *e != NULL; e++){
816
if(not add_environment(p, *e, false)){
679
if(not add_environment(p, *e)){
817
680
perror("add_environment");
818
681
}
819
682
}
824
687
process, too. */
825
688
if(p->environ[0] != NULL){
826
689
for(char **e = environ; *e != NULL; e++){
827
if(not add_environment(p, *e, false)){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
828
696
perror("add_environment");
829
697
}
830
698
}
832
700
833
701
int pipefd[2];
834
702
ret = pipe(pipefd);
835
if(ret == -1){
703
if (ret == -1){
836
704
perror("pipe");
837
705
exitstatus = EXIT_FAILURE;
838
706
goto fallback;
839
707
}
840
/* Ask OS to automatic close the pipe on exec */
841
708
ret = set_cloexec_flag(pipefd[0]);
842
709
if(ret < 0){
843
710
perror("set_cloexec_flag");
851
718
goto fallback;
852
719
}
853
720
/* Block SIGCHLD until process is safely in process list */
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
855
722
if(ret < 0){
856
723
perror("sigprocmask");
857
724
exitstatus = EXIT_FAILURE;
858
725
goto fallback;
859
726
}
860
/* Starting a new process to be watched */
727
// Starting a new process to be watched
861
728
pid_t pid = fork();
862
729
if(pid == -1){
863
730
perror("fork");
871
738
perror("sigaction");
872
739
_exit(EXIT_FAILURE);
873
740
}
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
875
742
if(ret < 0){
876
743
perror("sigprocmask");
877
744
_exit(EXIT_FAILURE);
878
745
}
879
746
880
747
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
881
748
if(ret == -1){
882
749
perror("dup2");
901
768
}
902
769
/* no return */
903
770
}
904
/* Parent process */
905
close(pipefd[1]); /* Close unused write end of pipe */
771
/* parent process */
906
772
free(filename);
907
plugin *new_plugin = getplugin(dirst->d_name);
908
if(new_plugin == NULL){
909
perror("getplugin");
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
773
close(pipefd[1]); /* close unused write end of pipe */
774
process *new_process = malloc(sizeof(process));
775
if (new_process == NULL){
776
perror("malloc");
777
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
911
778
if(ret < 0){
912
perror("sigprocmask");
779
perror("sigprocmask");
913
780
}
914
781
exitstatus = EXIT_FAILURE;
915
782
goto fallback;
916
783
}
917
784
918
new_plugin->pid = pid;
919
new_plugin->fd = pipefd[0];
920
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
921
790
/* Unblock SIGCHLD so signal handler can be run if this process
922
791
has already completed */
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
924
793
if(ret < 0){
925
794
perror("sigprocmask");
926
795
exitstatus = EXIT_FAILURE;
927
796
goto fallback;
928
797
}
929
798
930
FD_SET(new_plugin->fd, &rfds_all);
799
FD_SET(new_process->fd, &rfds_all);
931
800
932
if(maxfd < new_plugin->fd){
933
maxfd = new_plugin->fd;
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
934
803
}
804
935
805
}
936
806
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
937
810
closedir(dir);
938
811
dir = NULL;
939
940
for(plugin *p = plugin_list; p != NULL; p = p->next){
941
if(p->pid != 0){
942
break;
943
}
944
if(p->next == NULL){
945
fprintf(stderr, "No plugin processes started. Incorrect plugin"
946
" directory?\n");
947
free_plugin_list();
948
}
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
949
817
}
950
951
/* Main loop while running plugins exist */
952
while(plugin_list){
818
while(process_list){
953
819
fd_set rfds = rfds_all;
954
820
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
821
if (select_ret == -1){
956
822
perror("select");
957
823
exitstatus = EXIT_FAILURE;
958
824
goto fallback;
959
825
}
960
826
/* OK, now either a process completed, or something can be read
961
827
from one of them */
962
for(plugin *proc = plugin_list; proc != NULL;){
828
for(process *proc = process_list; proc ; proc = proc->next){
963
829
/* Is this process completely done? */
964
if(proc->completed and proc->eof){
830
if(proc->eof and proc->completed){
965
831
/* Only accept the plugin output if it exited cleanly */
966
832
if(not WIFEXITED(proc->status)
967
833
or WEXITSTATUS(proc->status) != 0){
968
834
/* Bad exit by plugin */
969
970
835
if(debug){
971
836
if(WIFEXITED(proc->status)){
972
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
973
" %d\n", (intmax_t) (proc->pid),
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
974
839
WEXITSTATUS(proc->status));
975
} else if(WIFSIGNALED(proc->status)){
976
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
977
" %d\n", (intmax_t) (proc->pid),
840
} else if(WIFSIGNALED(proc->status)) {
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
978
843
WTERMSIG(proc->status));
979
844
} else if(WCOREDUMP(proc->status)){
980
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
981
(intmax_t) (proc->pid));
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
982
847
}
983
848
}
984
985
849
/* Remove the plugin */
986
850
FD_CLR(proc->fd, &rfds_all);
987
988
851
/* Block signal while modifying process_list */
989
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
990
853
if(ret < 0){
992
855
exitstatus = EXIT_FAILURE;
993
856
goto fallback;
994
857
}
995
996
plugin *next_plugin = proc->next;
997
free_plugin(proc);
998
proc = next_plugin;
999
858
/* Delete this process entry from the list */
859
if(process_list == proc){
860
/* First one - simple */
861
process_list = proc->next;
862
} else {
863
/* Second one or later */
864
for(process *p = process_list; p != NULL; p = p->next){
865
if(p->next == proc){
866
p->next = proc->next;
867
break;
868
}
869
}
870
}
1000
871
/* We are done modifying process list, so unblock signal */
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
1003
874
if(ret < 0){
1004
875
perror("sigprocmask");
1005
exitstatus = EXIT_FAILURE;
1006
goto fallback;
1007
}
1008
1009
if(plugin_list == NULL){
1010
break;
1011
}
1012
1013
continue;
876
}
877
free(proc->buffer);
878
free(proc);
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
881
the process list */
882
break;
1014
883
}
1015
1016
884
/* This process exited nicely, so print its buffer */
1017
885
1018
886
bool bret = print_out_password(proc->buffer,
1019
887
proc->buffer_length);
1020
888
if(not bret){
1023
891
}
1024
892
goto fallback;
1025
893
}
1026
1027
894
/* This process has not completed. Does it have any output? */
1028
895
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1029
896
/* This process had nothing to say at this time */
1030
proc = proc->next;
1031
897
continue;
1032
898
}
1033
899
/* Before reading, make the process' data buffer large enough */
1034
900
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1035
901
proc->buffer = realloc(proc->buffer, proc->buffer_size
1036
902
+ (size_t) BUFFER_SIZE);
1037
if(proc->buffer == NULL){
903
if (proc->buffer == NULL){
1038
904
perror("malloc");
1039
905
exitstatus = EXIT_FAILURE;
1040
906
goto fallback;
1042
908
proc->buffer_size += BUFFER_SIZE;
1043
909
}
1044
910
/* Read from the process */
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1047
if(sret < 0){
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
1048
914
/* Read error from this process; ignore the error */
1049
proc = proc->next;
1050
915
continue;
1051
916
}
1052
if(sret == 0){
917
if(ret == 0){
1053
918
/* got EOF */
1054
919
proc->eof = true;
1055
920
} else {
1056
proc->buffer_length += (size_t) sret;
921
proc->buffer_length += (size_t) ret;
1057
922
}
1058
923
}
1059
924
}
1061
926
1062
927
fallback:
1063
928
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1065
930
/* Fallback if all plugins failed, none are found or an error
1066
931
occured */
1067
932
bool bret;
1068
933
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1069
934
char *passwordbuffer = getpass("Password: ");
1070
size_t len = strlen(passwordbuffer);
1071
/* Strip trailing newline */
1072
if(len > 0 and passwordbuffer[len-1] == '\n'){
1073
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1074
len--;
1075
}
1076
bret = print_out_password(passwordbuffer, len);
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1077
936
if(not bret){
1078
937
perror("print_out_password");
1079
938
exitstatus = EXIT_FAILURE;
1086
945
perror("sigaction");
1087
946
exitstatus = EXIT_FAILURE;
1088
947
}
1089
948
1090
949
if(custom_argv != NULL){
1091
for(char **arg = custom_argv+1; *arg != NULL; arg++){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1092
951
free(*arg);
1093
952
}
1094
953
free(custom_argv);
1095
954
}
955
free_plugin_list(plugin_list);
1096
956
1097
957
if(dir != NULL){
1098
958
closedir(dir);
1099
959
}
1100
960
1101
/* Kill the processes */
1102
for(plugin *p = plugin_list; p != NULL; p = p->next){
1103
if(p->pid != 0){
1104
close(p->fd);
1105
ret = kill(p->pid, SIGTERM);
1106
if(ret == -1 and errno != ESRCH){
1107
/* Set-uid proccesses might not get closed */
1108
perror("kill");
1109
}
961
/* Free the process list and kill the processes */
962
for(process *next; process_list != NULL; process_list = next){
963
next = process_list->next;
964
close(process_list->fd);
965
ret = kill(process_list->pid, SIGTERM);
966
if(ret == -1 and errno != ESRCH){
967
/* set-uid proccesses migth not get closed */
968
perror("kill");
1110
969
}
970
free(process_list->buffer);
971
free(process_list);
1111
972
}
1112
973
1113
974
/* Wait for any remaining child processes to terminate */
1118
979
perror("wait");
1119
980
}
1120
981
1121
free_plugin_list();
1122
1123
free(plugindir);
1124
free(argfile);
1125
1126
982
return exitstatus;
1127
983
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0