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- Committer: Teddy Hogeborn
- Date: 2009-02-05 03:37:06 UTC
- Revision ID: teddy@fukt.bsnet.se-20090205033706-unwxpqdwzgv84lux
* plugin-runner.c (main): Bug fix: Do setgid before setuid.
- files added:
- .bzr-builddeb
- debian
- debian/po
- 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
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
65
SIG_UNBLOCK, kill() */
65
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
66
68
67
69
#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";
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;
71
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
76
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
87
77
typedef struct plugin{
88
78
char *name; /* can be NULL or any plugin name */
89
79
char **argv;
91
81
char **environ;
92
82
int envc;
93
83
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 *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))){
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))){
101
106
return p;
102
107
}
103
108
}
104
109
/* Create a new plugin */
105
110
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
111
if(new_plugin == NULL){
107
112
return NULL;
108
113
}
109
114
char *copy_name = NULL;
110
115
if(name != NULL){
111
116
copy_name = strdup(name);
112
117
if(copy_name == NULL){
118
free(new_plugin);
113
119
return NULL;
114
120
}
115
121
}
116
122
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
123
*new_plugin = (plugin){ .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
122
127
123
128
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
129
if(new_plugin->argv == NULL){
125
130
free(copy_name);
126
131
free(new_plugin);
127
132
return NULL;
128
133
}
129
134
new_plugin->argv[0] = copy_name;
130
135
new_plugin->argv[1] = NULL;
131
136
132
137
new_plugin->environ = malloc(sizeof(char *));
133
138
if(new_plugin->environ == NULL){
134
139
free(copy_name);
137
142
return NULL;
138
143
}
139
144
new_plugin->environ[0] = NULL;
145
140
146
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
147
plugin_list = new_plugin;
142
148
return new_plugin;
143
149
}
144
150
174
180
}
175
181
176
182
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
183
static bool add_environment(plugin *p, const char *def, bool replace){
178
184
if(p == NULL){
179
185
return false;
180
186
}
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
}
181
204
return add_to_char_array(def, &(p->environ), &(p->envc));
182
205
}
183
206
184
185
207
/*
186
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
209
* Descriptor Flags".
188
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
189
211
*/
190
static int set_cloexec_flag(int fd)
191
{
212
static int set_cloexec_flag(int fd){
192
213
int ret = fcntl(fd, F_GETFD, 0);
193
214
/* If reading the flags failed, return error indication now. */
194
215
if(ret < 0){
198
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
199
220
}
200
221
201
process *process_list = NULL;
202
222
203
223
/* Mark processes as completed when they exit, and save their exit
204
224
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
int old_errno = errno;
206
227
while(true){
207
process *proc = process_list;
228
plugin *proc = plugin_list;
208
229
int status;
209
230
pid_t pid = waitpid(-1, &status, WNOHANG);
210
231
if(pid == 0){
212
233
break;
213
234
}
214
235
if(pid == -1){
215
if (errno != ECHILD){
216
perror("waitpid");
236
if(errno == ECHILD){
237
/* No child processes */
238
break;
217
239
}
218
/* No child processes */
219
break;
240
perror("waitpid");
220
241
}
221
242
222
243
/* A child exited, find it in process_list */
223
244
while(proc != NULL and proc->pid != pid){
224
245
proc = proc->next;
228
249
continue;
229
250
}
230
251
proc->status = status;
231
proc->completed = true;
252
proc->completed = 1;
232
253
}
254
errno = old_errno;
233
255
}
234
256
235
bool print_out_password(const char *buffer, size_t length){
257
/* Prints out a password to stdout */
258
static bool print_out_password(const char *buffer, size_t length){
236
259
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
260
for(size_t written = 0; written < length; written += (size_t)ret){
241
261
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
262
length - written));
247
267
return true;
248
268
}
249
269
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;
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
}
256
294
}
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;
295
}
296
297
free(plugin_node);
270
298
}
271
299
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);
300
static void free_plugin_list(void){
301
while(plugin_list != NULL){
302
free_plugin(plugin_list);
284
303
}
285
304
}
286
305
287
306
int main(int argc, char *argv[]){
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
307
char *plugindir = NULL;
308
char *argfile = NULL;
290
309
FILE *conffp;
291
310
size_t d_name_len;
292
311
DIR *dir = NULL;
293
312
struct dirent *dirst;
294
313
struct stat st;
295
314
fd_set rfds_all;
296
int ret, maxfd = 0;
315
int ret, numchars, maxfd = 0;
316
ssize_t sret;
317
intmax_t tmpmax;
297
318
uid_t uid = 65534;
298
319
gid_t gid = 65534;
299
320
bool debug = false;
324
345
{ .name = "global-options", .key = 'g',
325
346
.arg = "OPTION[,OPTION[,...]]",
326
347
.doc = "Options passed to all plugins" },
327
{ .name = "global-envs", .key = 'e',
348
{ .name = "global-env", .key = 'G',
328
349
.arg = "VAR=value",
329
350
.doc = "Environment variable passed to all plugins" },
330
351
{ .name = "options-for", .key = 'o',
331
352
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
332
353
.doc = "Options passed only to specified plugin" },
333
{ .name = "envs-for", .key = 'f',
354
{ .name = "env-for", .key = 'E',
334
355
.arg = "PLUGIN:ENV=value",
335
356
.doc = "Environment variable passed to specified plugin" },
336
357
{ .name = "disable", .key = 'd',
337
358
.arg = "PLUGIN",
338
359
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
361
.arg = "PLUGIN",
362
.doc = "Enable a specific plugin", .group = 1 },
339
363
{ .name = "plugin-dir", .key = 128,
340
364
.arg = "DIRECTORY",
341
365
.doc = "Specify a different plugin directory", .group = 2 },
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
349
.doc = "Debug mode", .group = 3 },
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 },
350
377
{ .name = NULL }
351
378
};
352
379
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){
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){
360
385
char *p;
361
386
while((p = strsep(&arg, ",")) != NULL){
362
387
if(p[0] == '\0'){
363
388
continue;
364
389
}
365
if(not add_argument(getplugin(NULL, plugins), p)){
390
if(not add_argument(getplugin(NULL), p)){
366
391
perror("add_argument");
367
392
return ARGP_ERR_UNKNOWN;
368
393
}
369
394
}
370
395
}
371
396
break;
372
case 'e':
397
case 'G': /* --global-env */
373
398
if(arg == NULL){
374
399
break;
375
400
}
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
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
384
403
}
385
404
break;
386
case 'o':
387
if (arg != NULL){
405
case 'o': /* --options-for */
406
if(arg != NULL){
388
407
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
408
if(p_name[0] == '\0' or arg == NULL){
390
409
break;
391
410
}
392
411
char *opt = strsep(&arg, ":");
393
if(opt[0] == '\0'){
412
if(opt[0] == '\0' or opt == NULL){
394
413
break;
395
414
}
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
}
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;
406
423
}
407
424
}
408
425
}
409
426
break;
410
case 'f':
427
case 'E': /* --env-for */
411
428
if(arg == NULL){
412
429
break;
413
430
}
416
433
if(envdef == NULL){
417
434
break;
418
435
}
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)){
436
*envdef = '\0';
437
if(not add_environment(getplugin(arg), envdef+1, true)){
425
438
perror("add_environment");
426
439
}
427
440
}
428
441
break;
429
case 'd':
430
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
442
case 'd': /* --disable */
443
if(arg != NULL){
444
plugin *p = getplugin(arg);
432
445
if(p == NULL){
433
446
return ARGP_ERR_UNKNOWN;
434
447
}
435
448
p->disabled = true;
436
449
}
437
450
break;
438
case 128:
439
plugindir = arg;
440
break;
441
case 129:
442
uid = (uid_t)strtol(arg, NULL, 10);
443
break;
444
case 130:
445
gid = (gid_t)strtol(arg, NULL, 10);
446
break;
447
case 131:
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 */
448
491
debug = true;
449
492
break;
450
case ARGP_KEY_ARG:
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
452
break;
453
case ARGP_KEY_END:
454
break;
455
default:
456
return ARGP_ERR_UNKNOWN;
457
}
458
return 0;
459
}
460
461
plugin *plugin_list = NULL;
462
463
struct argp argp = { .options = options, .parser = parse_opt,
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
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 = "",
465
549
.doc = "Mandos plugin runner -- Run plugins" };
466
550
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
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){
469
555
fprintf(stderr, "Unknown error while parsing arguments\n");
470
556
exitstatus = EXIT_FAILURE;
471
557
goto fallback;
472
558
}
473
474
conffp = fopen(argfile, "r");
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
}
475
569
if(conffp != NULL){
476
570
char *org_line = NULL;
477
571
char *p, *arg, *new_arg, *line;
478
572
size_t size = 0;
479
ssize_t sret;
480
573
const char whitespace_delims[] = " \r\t\f\v\n";
481
574
const char comment_delim[] = "#";
482
575
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 */
483
588
while(true){
484
589
sret = getline(&org_line, &size, conffp);
485
590
if(sret == -1){
493
598
continue;
494
599
}
495
600
new_arg = strdup(p);
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
500
goto fallback;
501
}
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;
502
619
}
503
620
}
504
621
free(org_line);
505
} else{
622
} else {
506
623
/* Check for harmful errors and go to fallback. Other errors might
507
624
not affect opening plugins */
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
509
626
perror("fopen");
510
627
exitstatus = EXIT_FAILURE;
511
628
goto fallback;
512
629
}
513
630
}
514
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
515
633
if(custom_argv != NULL){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
518
&plugin_list);
519
if (ret == ARGP_ERR_UNKNOWN){
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
0, NULL);
636
if(ret == ARGP_ERR_UNKNOWN){
520
637
fprintf(stderr, "Unknown error while parsing arguments\n");
521
638
exitstatus = EXIT_FAILURE;
522
639
goto fallback;
523
640
}
524
641
}
525
642
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
526
652
if(debug){
527
653
for(plugin *p = plugin_list; p != NULL; p=p->next){
528
654
fprintf(stderr, "Plugin: %s has %d arguments\n",
530
656
for(char **a = p->argv; *a != NULL; a++){
531
657
fprintf(stderr, "\tArg: %s\n", *a);
532
658
}
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
659
fprintf(stderr, "...and %d environment variables\n", p->envc);
534
660
for(char **a = p->environ; *a != NULL; a++){
535
661
fprintf(stderr, "\t%s\n", *a);
536
662
}
537
663
}
538
664
}
539
665
666
/* Strip permissions down to nobody */
667
setgid(gid);
668
if(ret == -1){
669
perror("setgid");
670
}
540
671
ret = setuid(uid);
541
if (ret == -1){
672
if(ret == -1){
542
673
perror("setuid");
543
674
}
544
675
545
setgid(gid);
546
if (ret == -1){
547
perror("setgid");
676
if(plugindir == NULL){
677
dir = opendir(PDIR);
678
} else {
679
dir = opendir(plugindir);
548
680
}
549
681
550
dir = opendir(plugindir);
551
682
if(dir == NULL){
552
683
perror("Could not open plugin dir");
553
684
exitstatus = EXIT_FAILURE;
569
700
570
701
FD_ZERO(&rfds_all);
571
702
703
/* Read and execute any executable in the plugin directory*/
572
704
while(true){
573
705
dirst = readdir(dir);
574
706
575
// All directory entries have been processed
707
/* All directory entries have been processed */
576
708
if(dirst == NULL){
577
if (errno == EBADF){
709
if(errno == EBADF){
578
710
perror("readdir");
579
711
exitstatus = EXIT_FAILURE;
580
712
goto fallback;
584
716
585
717
d_name_len = strlen(dirst->d_name);
586
718
587
// Ignore dotfiles, backup files and other junk
719
/* Ignore dotfiles, backup files and other junk */
588
720
{
589
721
bool bad_name = false;
590
722
592
724
593
725
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
594
726
".dpkg-old",
727
".dpkg-bak",
595
728
".dpkg-divert", NULL };
596
729
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
597
730
size_t pre_len = strlen(*pre);
605
738
break;
606
739
}
607
740
}
608
609
741
if(bad_name){
610
742
continue;
611
743
}
612
613
744
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
614
745
size_t suf_len = strlen(*suf);
615
746
if((d_name_len >= suf_len)
630
761
}
631
762
632
763
char *filename;
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
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
}
634
769
if(ret < 0){
635
770
perror("asprintf");
636
771
continue;
637
772
}
638
773
639
774
ret = stat(filename, &st);
640
if (ret == -1){
775
if(ret == -1){
641
776
perror("stat");
642
777
free(filename);
643
778
continue;
644
779
}
645
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
780
781
/* Ignore non-executable files */
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
647
783
if(debug){
648
784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
649
785
" with bad type or mode\n", filename);
651
787
free(filename);
652
788
continue;
653
789
}
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
790
791
plugin *p = getplugin(dirst->d_name);
655
792
if(p == NULL){
656
793
perror("getplugin");
657
794
free(filename);
667
804
}
668
805
{
669
806
/* Add global arguments to argument list for this plugin */
670
plugin *g = getplugin(NULL, &plugin_list);
807
plugin *g = getplugin(NULL);
671
808
if(g != NULL){
672
809
for(char **a = g->argv + 1; *a != NULL; a++){
673
810
if(not add_argument(p, *a)){
676
813
}
677
814
/* Add global environment variables */
678
815
for(char **e = g->environ; *e != NULL; e++){
679
if(not add_environment(p, *e)){
816
if(not add_environment(p, *e, false)){
680
817
perror("add_environment");
681
818
}
682
819
}
687
824
process, too. */
688
825
if(p->environ[0] != NULL){
689
826
for(char **e = environ; *e != NULL; e++){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
827
if(not add_environment(p, *e, false)){
696
828
perror("add_environment");
697
829
}
698
830
}
700
832
701
833
int pipefd[2];
702
834
ret = pipe(pipefd);
703
if (ret == -1){
835
if(ret == -1){
704
836
perror("pipe");
705
837
exitstatus = EXIT_FAILURE;
706
838
goto fallback;
707
839
}
840
/* Ask OS to automatic close the pipe on exec */
708
841
ret = set_cloexec_flag(pipefd[0]);
709
842
if(ret < 0){
710
843
perror("set_cloexec_flag");
718
851
goto fallback;
719
852
}
720
853
/* Block SIGCHLD until process is safely in process list */
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
722
855
if(ret < 0){
723
856
perror("sigprocmask");
724
857
exitstatus = EXIT_FAILURE;
725
858
goto fallback;
726
859
}
727
// Starting a new process to be watched
860
/* Starting a new process to be watched */
728
861
pid_t pid = fork();
729
862
if(pid == -1){
730
863
perror("fork");
738
871
perror("sigaction");
739
872
_exit(EXIT_FAILURE);
740
873
}
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
742
875
if(ret < 0){
743
876
perror("sigprocmask");
744
877
_exit(EXIT_FAILURE);
745
878
}
746
879
747
880
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
748
881
if(ret == -1){
749
882
perror("dup2");
768
901
}
769
902
/* no return */
770
903
}
771
/* parent process */
904
/* Parent process */
905
close(pipefd[1]); /* Close unused write end of pipe */
772
906
free(filename);
773
close(pipefd[1]); /* close unused write end of pipe */
774
process *new_process = malloc(sizeof(process));
775
if (new_process == NULL){
776
perror("malloc");
777
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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);
778
911
if(ret < 0){
779
perror("sigprocmask");
912
perror("sigprocmask");
780
913
}
781
914
exitstatus = EXIT_FAILURE;
782
915
goto fallback;
783
916
}
784
917
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
918
new_plugin->pid = pid;
919
new_plugin->fd = pipefd[0];
920
790
921
/* Unblock SIGCHLD so signal handler can be run if this process
791
922
has already completed */
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
793
924
if(ret < 0){
794
925
perror("sigprocmask");
795
926
exitstatus = EXIT_FAILURE;
796
927
goto fallback;
797
928
}
798
929
799
FD_SET(new_process->fd, &rfds_all);
930
FD_SET(new_plugin->fd, &rfds_all);
800
931
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
932
if(maxfd < new_plugin->fd){
933
maxfd = new_plugin->fd;
803
934
}
804
805
935
}
806
936
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
810
937
closedir(dir);
811
938
dir = NULL;
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = 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
}
817
949
}
818
while(process_list){
950
951
/* Main loop while running plugins exist */
952
while(plugin_list){
819
953
fd_set rfds = rfds_all;
820
954
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
821
if (select_ret == -1){
955
if(select_ret == -1){
822
956
perror("select");
823
957
exitstatus = EXIT_FAILURE;
824
958
goto fallback;
825
959
}
826
960
/* OK, now either a process completed, or something can be read
827
961
from one of them */
828
for(process *proc = process_list; proc ; proc = proc->next){
962
for(plugin *proc = plugin_list; proc != NULL;){
829
963
/* Is this process completely done? */
830
if(proc->eof and proc->completed){
964
if(proc->completed and proc->eof){
831
965
/* Only accept the plugin output if it exited cleanly */
832
966
if(not WIFEXITED(proc->status)
833
967
or WEXITSTATUS(proc->status) != 0){
834
968
/* Bad exit by plugin */
969
835
970
if(debug){
836
971
if(WIFEXITED(proc->status)){
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
972
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
973
" %d\n", (intmax_t) (proc->pid),
839
974
WEXITSTATUS(proc->status));
840
} else if(WIFSIGNALED(proc->status)) {
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
975
} else if(WIFSIGNALED(proc->status)){
976
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
977
" %d\n", (intmax_t) (proc->pid),
843
978
WTERMSIG(proc->status));
844
979
} else if(WCOREDUMP(proc->status)){
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
980
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
981
(intmax_t) (proc->pid));
847
982
}
848
983
}
984
849
985
/* Remove the plugin */
850
986
FD_CLR(proc->fd, &rfds_all);
987
851
988
/* Block signal while modifying process_list */
852
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
990
if(ret < 0){
855
992
exitstatus = EXIT_FAILURE;
856
993
goto fallback;
857
994
}
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
}
995
996
plugin *next_plugin = proc->next;
997
free_plugin(proc);
998
proc = next_plugin;
999
871
1000
/* We are done modifying process list, so unblock signal */
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
874
1003
if(ret < 0){
875
1004
perror("sigprocmask");
876
}
877
free(proc->buffer);
878
free(proc);
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
881
the process list */
882
break;
1005
exitstatus = EXIT_FAILURE;
1006
goto fallback;
1007
}
1008
1009
if(plugin_list == NULL){
1010
break;
1011
}
1012
1013
continue;
883
1014
}
1015
884
1016
/* This process exited nicely, so print its buffer */
885
1017
886
1018
bool bret = print_out_password(proc->buffer,
887
1019
proc->buffer_length);
888
1020
if(not bret){
891
1023
}
892
1024
goto fallback;
893
1025
}
1026
894
1027
/* This process has not completed. Does it have any output? */
895
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
896
1029
/* This process had nothing to say at this time */
1030
proc = proc->next;
897
1031
continue;
898
1032
}
899
1033
/* Before reading, make the process' data buffer large enough */
900
1034
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
901
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
902
1036
+ (size_t) BUFFER_SIZE);
903
if (proc->buffer == NULL){
1037
if(proc->buffer == NULL){
904
1038
perror("malloc");
905
1039
exitstatus = EXIT_FAILURE;
906
1040
goto fallback;
908
1042
proc->buffer_size += BUFFER_SIZE;
909
1043
}
910
1044
/* Read from the process */
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1047
if(sret < 0){
914
1048
/* Read error from this process; ignore the error */
1049
proc = proc->next;
915
1050
continue;
916
1051
}
917
if(ret == 0){
1052
if(sret == 0){
918
1053
/* got EOF */
919
1054
proc->eof = true;
920
1055
} else {
921
proc->buffer_length += (size_t) ret;
1056
proc->buffer_length += (size_t) sret;
922
1057
}
923
1058
}
924
1059
}
926
1061
927
1062
fallback:
928
1063
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
930
1065
/* Fallback if all plugins failed, none are found or an error
931
1066
occured */
932
1067
bool bret;
933
1068
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
934
1069
char *passwordbuffer = getpass("Password: ");
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
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);
936
1077
if(not bret){
937
1078
perror("print_out_password");
938
1079
exitstatus = EXIT_FAILURE;
945
1086
perror("sigaction");
946
1087
exitstatus = EXIT_FAILURE;
947
1088
}
948
1089
949
1090
if(custom_argv != NULL){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1091
for(char **arg = custom_argv+1; *arg != NULL; arg++){
951
1092
free(*arg);
952
1093
}
953
1094
free(custom_argv);
954
1095
}
955
free_plugin_list(plugin_list);
956
1096
957
1097
if(dir != NULL){
958
1098
closedir(dir);
959
1099
}
960
1100
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");
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
}
969
1110
}
970
free(process_list->buffer);
971
free(process_list);
972
1111
}
973
1112
974
1113
/* Wait for any remaining child processes to terminate */
979
1118
perror("wait");
980
1119
}
981
1120
1121
free_plugin_list();
1122
1123
free(plugindir);
1124
free(argfile);
1125
982
1126
return exitstatus;
983
1127
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0