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- Committer: Björn Påhlsson
- Date: 2009-02-09 18:15:18 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 309.
- Revision ID: belorn@braxen-20090209181518-powtql91qv3wu51d
Earlier signal handling
- 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,
56
57
#include <argp.h> /* struct argp_option, struct
57
58
argp_state, struct argp,
58
59
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
60
62
#include <signal.h> /* struct sigaction, sigemptyset(),
61
63
sigaddset(), sigaction(),
62
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
63
65
SIG_UNBLOCK, kill() */
64
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
65
68
66
69
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
70
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;
70
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
76
72
struct process;
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;
73
84
74
typedef struct process{
85
/* Variables used for running processes*/
75
86
pid_t pid;
76
87
int fd;
77
88
char *buffer;
78
89
size_t buffer_size;
79
90
size_t buffer_length;
80
91
bool eof;
81
bool completed;
92
volatile sig_atomic_t completed;
82
93
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
char **environ;
91
int envc;
92
bool disabled;
93
94
struct plugin *next;
94
95
} plugin;
95
96
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
100
106
return p;
101
107
}
102
108
}
103
109
/* Create a new plugin */
104
110
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
111
if(new_plugin == NULL){
106
112
return NULL;
107
113
}
108
114
char *copy_name = NULL;
109
115
if(name != NULL){
110
116
copy_name = strdup(name);
111
117
if(copy_name == NULL){
118
free(new_plugin);
112
119
return NULL;
113
120
}
114
121
}
115
122
116
*new_plugin = (plugin) { .name = copy_name,
117
.argc = 1,
118
.envc = 0,
119
.disabled = false,
120
.next = *plugin_list };
123
*new_plugin = (plugin){ .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
121
127
122
128
new_plugin->argv = malloc(sizeof(char *) * 2);
123
if (new_plugin->argv == NULL){
129
if(new_plugin->argv == NULL){
124
130
free(copy_name);
125
131
free(new_plugin);
126
132
return NULL;
127
133
}
128
134
new_plugin->argv[0] = copy_name;
129
135
new_plugin->argv[1] = NULL;
130
136
131
137
new_plugin->environ = malloc(sizeof(char *));
132
138
if(new_plugin->environ == NULL){
133
139
free(copy_name);
136
142
return NULL;
137
143
}
138
144
new_plugin->environ[0] = NULL;
145
139
146
/* Append the new plugin to the list */
140
*plugin_list = new_plugin;
147
plugin_list = new_plugin;
141
148
return new_plugin;
142
149
}
143
150
173
180
}
174
181
175
182
/* Add to a plugin's environment */
176
static bool add_environment(plugin *p, const char *def){
183
static bool add_environment(plugin *p, const char *def, bool replace){
177
184
if(p == NULL){
178
185
return false;
179
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
}
180
204
return add_to_char_array(def, &(p->environ), &(p->envc));
181
205
}
182
206
183
184
207
/*
185
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
186
209
* Descriptor Flags".
187
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
188
211
*/
189
static int set_cloexec_flag(int fd)
190
{
212
static int set_cloexec_flag(int fd){
191
213
int ret = fcntl(fd, F_GETFD, 0);
192
214
/* If reading the flags failed, return error indication now. */
193
215
if(ret < 0){
197
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
198
220
}
199
221
200
process *process_list = NULL;
201
222
202
/* Mark processes as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
203
224
status. */
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
int old_errno = errno;
206
227
while(true){
228
plugin *proc = plugin_list;
207
229
int status;
208
230
pid_t pid = waitpid(-1, &status, WNOHANG);
209
231
if(pid == 0){
232
/* Only still running child processes */
210
233
break;
211
234
}
212
235
if(pid == -1){
213
if (errno != ECHILD){
214
perror("waitpid");
236
if(errno == ECHILD){
237
/* No child processes */
238
break;
215
239
}
216
return;
240
perror("waitpid");
217
241
}
218
242
243
/* A child exited, find it in process_list */
219
244
while(proc != NULL and proc->pid != pid){
220
245
proc = proc->next;
221
246
}
224
249
continue;
225
250
}
226
251
proc->status = status;
227
proc->completed = true;
252
proc->completed = 1;
228
253
}
254
errno = old_errno;
229
255
}
230
256
231
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){
232
259
ssize_t ret;
233
if(length>0 and buffer[length-1] == '\n'){
234
length--;
235
}
236
260
for(size_t written = 0; written < length; written += (size_t)ret){
237
261
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
238
262
length - written));
243
267
return true;
244
268
}
245
269
246
char **add_to_argv(char **argv, int *argc, char *arg){
247
if (argv == NULL){
248
*argc = 1;
249
argv = malloc(sizeof(char*) * 2);
250
if(argv == NULL){
251
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
}
252
294
}
253
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
254
argv[1] = NULL;
255
}
256
*argc += 1;
257
argv = realloc(argv, sizeof(char *)
258
* ((unsigned int) *argc + 1));
259
if(argv == NULL){
260
return NULL;
261
}
262
argv[*argc-1] = arg;
263
argv[*argc] = NULL;
264
return argv;
295
}
296
297
free(plugin_node);
265
298
}
266
299
267
static void free_plugin_list(plugin *plugin_list){
268
for(plugin *next; plugin_list != NULL; plugin_list = next){
269
next = plugin_list->next;
270
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
271
free(*arg);
272
}
273
free(plugin_list->argv);
274
for(char **env = plugin_list->environ; *env != NULL; env++){
275
free(*env);
276
}
277
free(plugin_list->environ);
278
free(plugin_list);
300
static void free_plugin_list(void){
301
while(plugin_list != NULL){
302
free_plugin(plugin_list);
279
303
}
280
304
}
281
305
282
306
int main(int argc, char *argv[]){
283
const char *plugindir = "/lib/mandos/plugins.d";
284
const char *argfile = ARGFILE;
307
char *plugindir = NULL;
308
char *argfile = NULL;
285
309
FILE *conffp;
286
310
size_t d_name_len;
287
311
DIR *dir = NULL;
288
312
struct dirent *dirst;
289
313
struct stat st;
290
314
fd_set rfds_all;
291
int ret, maxfd = 0;
315
int ret, numchars, maxfd = 0;
316
ssize_t sret;
317
intmax_t tmpmax;
292
318
uid_t uid = 65534;
293
319
gid_t gid = 65534;
294
320
bool debug = false;
319
345
{ .name = "global-options", .key = 'g',
320
346
.arg = "OPTION[,OPTION[,...]]",
321
347
.doc = "Options passed to all plugins" },
322
{ .name = "global-envs", .key = 'e',
348
{ .name = "global-env", .key = 'G',
323
349
.arg = "VAR=value",
324
350
.doc = "Environment variable passed to all plugins" },
325
351
{ .name = "options-for", .key = 'o',
326
352
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
327
353
.doc = "Options passed only to specified plugin" },
328
{ .name = "envs-for", .key = 'f',
354
{ .name = "env-for", .key = 'E',
329
355
.arg = "PLUGIN:ENV=value",
330
356
.doc = "Environment variable passed to specified plugin" },
331
357
{ .name = "disable", .key = 'd',
332
358
.arg = "PLUGIN",
333
359
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
361
.arg = "PLUGIN",
362
.doc = "Enable a specific plugin", .group = 1 },
334
363
{ .name = "plugin-dir", .key = 128,
335
364
.arg = "DIRECTORY",
336
365
.doc = "Specify a different plugin directory", .group = 2 },
337
{ .name = "userid", .key = 129,
338
.arg = "ID", .flags = 0,
339
.doc = "User ID the plugins will run as", .group = 2 },
340
{ .name = "groupid", .key = 130,
341
.arg = "ID", .flags = 0,
342
.doc = "Group ID the plugins will run as", .group = 2 },
343
{ .name = "debug", .key = 131,
344
.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 },
345
377
{ .name = NULL }
346
378
};
347
379
348
error_t parse_opt (int key, char *arg, struct argp_state *state) {
349
/* Get the INPUT argument from `argp_parse', which we know is a
350
pointer to our plugin list pointer. */
351
plugin **plugins = state->input;
352
switch (key) {
353
case 'g':
354
if (arg != NULL){
355
char *p;
356
while((p = strsep(&arg, ",")) != NULL){
357
if(p[0] == '\0'){
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){
385
char *plugin_option;
386
while((plugin_option = strsep(&arg, ",")) != NULL){
387
if(plugin_option[0] == '\0'){
358
388
continue;
359
389
}
360
if(not add_argument(getplugin(NULL, plugins), p)){
390
if(not add_argument(getplugin(NULL), plugin_option)){
361
391
perror("add_argument");
362
392
return ARGP_ERR_UNKNOWN;
363
393
}
364
394
}
365
395
}
366
396
break;
367
case 'e':
397
case 'G': /* --global-env */
368
398
if(arg == NULL){
369
399
break;
370
400
}
371
{
372
char *envdef = strdup(arg);
373
if(envdef == NULL){
374
break;
375
}
376
if(not add_environment(getplugin(NULL, plugins), envdef)){
377
perror("add_environment");
378
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
379
403
}
380
404
break;
381
case 'o':
382
if (arg != NULL){
383
char *p_name = strsep(&arg, ":");
384
if(p_name[0] == '\0'){
385
break;
386
}
387
char *opt = strsep(&arg, ":");
388
if(opt[0] == '\0'){
389
break;
390
}
391
if(opt != NULL){
392
char *p;
393
while((p = strsep(&opt, ",")) != NULL){
394
if(p[0] == '\0'){
395
continue;
396
}
397
if(not add_argument(getplugin(p_name, plugins), p)){
398
perror("add_argument");
399
return ARGP_ERR_UNKNOWN;
400
}
405
case 'o': /* --options-for */
406
if(arg != NULL){
407
char *plugin_name = strsep(&arg, ":");
408
if(plugin_name[0] == '\0'){
409
break;
410
}
411
char *plugin_option;
412
while((plugin_option = strsep(&arg, ",")) != NULL){
413
if(not add_argument(getplugin(plugin_name), plugin_option)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
401
416
}
402
417
}
403
418
}
404
419
break;
405
case 'f':
420
case 'E': /* --env-for */
406
421
if(arg == NULL){
407
422
break;
408
423
}
411
426
if(envdef == NULL){
412
427
break;
413
428
}
414
char *p_name = strndup(arg, (size_t) (envdef-arg));
415
if(p_name == NULL){
416
break;
417
}
418
envdef++;
419
if(not add_environment(getplugin(p_name, plugins), envdef)){
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
420
431
perror("add_environment");
421
432
}
422
433
}
423
434
break;
424
case 'd':
425
if (arg != NULL){
426
plugin *p = getplugin(arg, plugins);
435
case 'd': /* --disable */
436
if(arg != NULL){
437
plugin *p = getplugin(arg);
427
438
if(p == NULL){
428
439
return ARGP_ERR_UNKNOWN;
429
440
}
430
441
p->disabled = true;
431
442
}
432
443
break;
433
case 128:
434
plugindir = arg;
435
break;
436
case 129:
437
uid = (uid_t)strtol(arg, NULL, 10);
438
break;
439
case 130:
440
gid = (gid_t)strtol(arg, NULL, 10);
441
break;
442
case 131:
444
case 'e': /* --enable */
445
if(arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = false;
451
}
452
break;
453
case 128: /* --plugin-dir */
454
free(plugindir);
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
459
break;
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
462
break;
463
case 130: /* --userid */
464
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
465
if(ret < 1 or tmpmax != (uid_t)tmpmax
466
or arg[numchars] != '\0'){
467
fprintf(stderr, "Bad user ID number: \"%s\", using %"
468
PRIdMAX "\n", arg, (intmax_t)uid);
469
} else {
470
uid = (uid_t)tmpmax;
471
}
472
break;
473
case 131: /* --groupid */
474
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
475
if(ret < 1 or tmpmax != (gid_t)tmpmax
476
or arg[numchars] != '\0'){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %"
478
PRIdMAX "\n", arg, (intmax_t)gid);
479
} else {
480
gid = (gid_t)tmpmax;
481
}
482
break;
483
case 132: /* --debug */
443
484
debug = true;
444
485
break;
445
case ARGP_KEY_ARG:
446
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
447
break;
448
case ARGP_KEY_END:
449
break;
450
default:
451
return ARGP_ERR_UNKNOWN;
452
}
453
return 0;
454
}
455
456
plugin *plugin_list = NULL;
457
458
struct argp argp = { .options = options, .parser = parse_opt,
459
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
486
/*
487
* When adding more options before this line, remember to also add a
488
* "case" to the "parse_opt_config_file" function below.
489
*/
490
case ARGP_KEY_ARG:
491
/* Cryptsetup always passes an argument, which is an empty
492
string if "none" was specified in /etc/crypttab. So if
493
argument was empty, we ignore it silently. */
494
if(arg[0] != '\0'){
495
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
496
}
497
break;
498
case ARGP_KEY_END:
499
break;
500
default:
501
return ARGP_ERR_UNKNOWN;
502
}
503
return 0;
504
}
505
506
/* This option parser is the same as parse_opt() above, except it
507
ignores everything but the --config-file option. */
508
error_t parse_opt_config_file(int key, char *arg,
509
__attribute__((unused))
510
struct argp_state *state){
511
switch(key){
512
case 'g': /* --global-options */
513
case 'G': /* --global-env */
514
case 'o': /* --options-for */
515
case 'E': /* --env-for */
516
case 'd': /* --disable */
517
case 'e': /* --enable */
518
case 128: /* --plugin-dir */
519
break;
520
case 129: /* --config-file */
521
free(argfile);
522
argfile = strdup(arg);
523
if(argfile == NULL){
524
perror("strdup");
525
}
526
break;
527
case 130: /* --userid */
528
case 131: /* --groupid */
529
case 132: /* --debug */
530
case ARGP_KEY_ARG:
531
case ARGP_KEY_END:
532
break;
533
default:
534
return ARGP_ERR_UNKNOWN;
535
}
536
return 0;
537
}
538
539
struct argp argp = { .options = options,
540
.parser = parse_opt_config_file,
541
.args_doc = "",
460
542
.doc = "Mandos plugin runner -- Run plugins" };
461
543
462
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
463
if (ret == ARGP_ERR_UNKNOWN){
544
/* Parse using parse_opt_config_file() in order to get the custom
545
config file location, if any. */
546
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
547
if(ret == ARGP_ERR_UNKNOWN){
464
548
fprintf(stderr, "Unknown error while parsing arguments\n");
465
549
exitstatus = EXIT_FAILURE;
466
550
goto fallback;
467
551
}
468
469
conffp = fopen(argfile, "r");
552
553
/* Reset to the normal argument parser */
554
argp.parser = parse_opt;
555
556
/* Open the configfile if available */
557
if(argfile == NULL){
558
conffp = fopen(AFILE, "r");
559
} else {
560
conffp = fopen(argfile, "r");
561
}
470
562
if(conffp != NULL){
471
563
char *org_line = NULL;
472
564
char *p, *arg, *new_arg, *line;
473
565
size_t size = 0;
474
ssize_t sret;
475
566
const char whitespace_delims[] = " \r\t\f\v\n";
476
567
const char comment_delim[] = "#";
477
568
569
custom_argc = 1;
570
custom_argv = malloc(sizeof(char*) * 2);
571
if(custom_argv == NULL){
572
perror("malloc");
573
exitstatus = EXIT_FAILURE;
574
goto fallback;
575
}
576
custom_argv[0] = argv[0];
577
custom_argv[1] = NULL;
578
579
/* for each line in the config file, strip whitespace and ignore
580
commented text */
478
581
while(true){
479
582
sret = getline(&org_line, &size, conffp);
480
583
if(sret == -1){
488
591
continue;
489
592
}
490
593
new_arg = strdup(p);
491
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
492
if (custom_argv == NULL){
493
perror("add_to_argv");
494
exitstatus = EXIT_FAILURE;
495
goto fallback;
496
}
594
if(new_arg == NULL){
595
perror("strdup");
596
exitstatus = EXIT_FAILURE;
597
free(org_line);
598
goto fallback;
599
}
600
601
custom_argc += 1;
602
custom_argv = realloc(custom_argv, sizeof(char *)
603
* ((unsigned int) custom_argc + 1));
604
if(custom_argv == NULL){
605
perror("realloc");
606
exitstatus = EXIT_FAILURE;
607
free(org_line);
608
goto fallback;
609
}
610
custom_argv[custom_argc-1] = new_arg;
611
custom_argv[custom_argc] = NULL;
497
612
}
498
613
}
499
614
free(org_line);
500
} else{
615
} else {
501
616
/* Check for harmful errors and go to fallback. Other errors might
502
617
not affect opening plugins */
503
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
618
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
504
619
perror("fopen");
505
620
exitstatus = EXIT_FAILURE;
506
621
goto fallback;
507
622
}
508
623
}
509
624
/* If there was any arguments from configuration file,
625
pass them to parser as command arguments */
510
626
if(custom_argv != NULL){
511
custom_argv[0] = argv[0];
512
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
513
if (ret == ARGP_ERR_UNKNOWN){
627
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
628
0, NULL);
629
if(ret == ARGP_ERR_UNKNOWN){
514
630
fprintf(stderr, "Unknown error while parsing arguments\n");
515
631
exitstatus = EXIT_FAILURE;
516
632
goto fallback;
517
633
}
518
634
}
519
635
636
/* Parse actual command line arguments, to let them override the
637
config file */
638
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
639
if(ret == ARGP_ERR_UNKNOWN){
640
fprintf(stderr, "Unknown error while parsing arguments\n");
641
exitstatus = EXIT_FAILURE;
642
goto fallback;
643
}
644
520
645
if(debug){
521
646
for(plugin *p = plugin_list; p != NULL; p=p->next){
522
647
fprintf(stderr, "Plugin: %s has %d arguments\n",
524
649
for(char **a = p->argv; *a != NULL; a++){
525
650
fprintf(stderr, "\tArg: %s\n", *a);
526
651
}
527
fprintf(stderr, "...and %u environment variables\n", p->envc);
652
fprintf(stderr, "...and %d environment variables\n", p->envc);
528
653
for(char **a = p->environ; *a != NULL; a++){
529
654
fprintf(stderr, "\t%s\n", *a);
530
655
}
531
656
}
532
657
}
533
658
659
/* Strip permissions down to nobody */
660
setgid(gid);
661
if(ret == -1){
662
perror("setgid");
663
}
534
664
ret = setuid(uid);
535
if (ret == -1){
665
if(ret == -1){
536
666
perror("setuid");
537
667
}
538
668
539
setgid(gid);
540
if (ret == -1){
541
perror("setgid");
669
if(plugindir == NULL){
670
dir = opendir(PDIR);
671
} else {
672
dir = opendir(plugindir);
542
673
}
543
674
544
dir = opendir(plugindir);
545
675
if(dir == NULL){
546
676
perror("Could not open plugin dir");
547
677
exitstatus = EXIT_FAILURE;
563
693
564
694
FD_ZERO(&rfds_all);
565
695
696
/* Read and execute any executable in the plugin directory*/
566
697
while(true){
567
698
dirst = readdir(dir);
568
699
569
// All directory entries have been processed
700
/* All directory entries have been processed */
570
701
if(dirst == NULL){
571
if (errno == EBADF){
702
if(errno == EBADF){
572
703
perror("readdir");
573
704
exitstatus = EXIT_FAILURE;
574
705
goto fallback;
578
709
579
710
d_name_len = strlen(dirst->d_name);
580
711
581
// Ignore dotfiles, backup files and other junk
712
/* Ignore dotfiles, backup files and other junk */
582
713
{
583
714
bool bad_name = false;
584
715
586
717
587
718
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
588
719
".dpkg-old",
720
".dpkg-bak",
589
721
".dpkg-divert", NULL };
590
722
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
591
723
size_t pre_len = strlen(*pre);
599
731
break;
600
732
}
601
733
}
602
603
734
if(bad_name){
604
735
continue;
605
736
}
606
607
737
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
608
738
size_t suf_len = strlen(*suf);
609
739
if((d_name_len >= suf_len)
624
754
}
625
755
626
756
char *filename;
627
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
757
if(plugindir == NULL){
758
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
759
} else {
760
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
761
}
628
762
if(ret < 0){
629
763
perror("asprintf");
630
764
continue;
631
765
}
632
766
633
767
ret = stat(filename, &st);
634
if (ret == -1){
768
if(ret == -1){
635
769
perror("stat");
636
770
free(filename);
637
771
continue;
638
772
}
639
640
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
773
774
/* Ignore non-executable files */
775
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
641
776
if(debug){
642
777
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
643
778
" with bad type or mode\n", filename);
645
780
free(filename);
646
781
continue;
647
782
}
648
plugin *p = getplugin(dirst->d_name, &plugin_list);
783
784
plugin *p = getplugin(dirst->d_name);
649
785
if(p == NULL){
650
786
perror("getplugin");
651
787
free(filename);
661
797
}
662
798
{
663
799
/* Add global arguments to argument list for this plugin */
664
plugin *g = getplugin(NULL, &plugin_list);
800
plugin *g = getplugin(NULL);
665
801
if(g != NULL){
666
802
for(char **a = g->argv + 1; *a != NULL; a++){
667
803
if(not add_argument(p, *a)){
670
806
}
671
807
/* Add global environment variables */
672
808
for(char **e = g->environ; *e != NULL; e++){
673
if(not add_environment(p, *e)){
809
if(not add_environment(p, *e, false)){
674
810
perror("add_environment");
675
811
}
676
812
}
681
817
process, too. */
682
818
if(p->environ[0] != NULL){
683
819
for(char **e = environ; *e != NULL; e++){
684
char *copy = strdup(*e);
685
if(copy == NULL){
686
perror("strdup");
687
continue;
688
}
689
if(not add_environment(p, copy)){
820
if(not add_environment(p, *e, false)){
690
821
perror("add_environment");
691
822
}
692
823
}
694
825
695
826
int pipefd[2];
696
827
ret = pipe(pipefd);
697
if (ret == -1){
828
if(ret == -1){
698
829
perror("pipe");
699
830
exitstatus = EXIT_FAILURE;
700
831
goto fallback;
701
832
}
833
/* Ask OS to automatic close the pipe on exec */
702
834
ret = set_cloexec_flag(pipefd[0]);
703
835
if(ret < 0){
704
836
perror("set_cloexec_flag");
712
844
goto fallback;
713
845
}
714
846
/* Block SIGCHLD until process is safely in process list */
715
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
847
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
716
848
if(ret < 0){
717
849
perror("sigprocmask");
718
850
exitstatus = EXIT_FAILURE;
719
851
goto fallback;
720
852
}
721
// Starting a new process to be watched
853
/* Starting a new process to be watched */
722
854
pid_t pid = fork();
723
855
if(pid == -1){
724
856
perror("fork");
732
864
perror("sigaction");
733
865
_exit(EXIT_FAILURE);
734
866
}
735
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
867
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
736
868
if(ret < 0){
737
869
perror("sigprocmask");
738
870
_exit(EXIT_FAILURE);
739
871
}
740
872
741
873
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
742
874
if(ret == -1){
743
875
perror("dup2");
762
894
}
763
895
/* no return */
764
896
}
765
/* parent process */
897
/* Parent process */
898
close(pipefd[1]); /* Close unused write end of pipe */
766
899
free(filename);
767
close(pipefd[1]); /* close unused write end of pipe */
768
process *new_process = malloc(sizeof(process));
769
if (new_process == NULL){
770
perror("malloc");
771
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
900
plugin *new_plugin = getplugin(dirst->d_name);
901
if(new_plugin == NULL){
902
perror("getplugin");
903
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
772
904
if(ret < 0){
773
perror("sigprocmask");
905
perror("sigprocmask");
774
906
}
775
907
exitstatus = EXIT_FAILURE;
776
908
goto fallback;
777
909
}
778
910
779
*new_process = (struct process){ .pid = pid,
780
.fd = pipefd[0],
781
.next = process_list };
782
// List handling
783
process_list = new_process;
911
new_plugin->pid = pid;
912
new_plugin->fd = pipefd[0];
913
784
914
/* Unblock SIGCHLD so signal handler can be run if this process
785
915
has already completed */
786
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
916
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
787
917
if(ret < 0){
788
918
perror("sigprocmask");
789
919
exitstatus = EXIT_FAILURE;
790
920
goto fallback;
791
921
}
792
922
793
FD_SET(new_process->fd, &rfds_all);
923
FD_SET(new_plugin->fd, &rfds_all);
794
924
795
if (maxfd < new_process->fd){
796
maxfd = new_process->fd;
925
if(maxfd < new_plugin->fd){
926
maxfd = new_plugin->fd;
797
927
}
798
799
928
}
800
929
801
free_plugin_list(plugin_list);
802
plugin_list = NULL;
803
804
930
closedir(dir);
805
931
dir = NULL;
806
807
if (process_list == NULL){
808
fprintf(stderr, "No plugin processes started. Incorrect plugin"
809
" directory?\n");
810
process_list = NULL;
932
free_plugin(getplugin(NULL));
933
934
for(plugin *p = plugin_list; p != NULL; p = p->next){
935
if(p->pid != 0){
936
break;
937
}
938
if(p->next == NULL){
939
fprintf(stderr, "No plugin processes started. Incorrect plugin"
940
" directory?\n");
941
free_plugin_list();
942
}
811
943
}
812
while(process_list){
944
945
/* Main loop while running plugins exist */
946
while(plugin_list){
813
947
fd_set rfds = rfds_all;
814
948
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
815
if (select_ret == -1){
949
if(select_ret == -1){
816
950
perror("select");
817
951
exitstatus = EXIT_FAILURE;
818
952
goto fallback;
819
953
}
820
954
/* OK, now either a process completed, or something can be read
821
955
from one of them */
822
for(process *proc = process_list; proc ; proc = proc->next){
956
for(plugin *proc = plugin_list; proc != NULL;){
823
957
/* Is this process completely done? */
824
if(proc->eof and proc->completed){
958
if(proc->completed and proc->eof){
825
959
/* Only accept the plugin output if it exited cleanly */
826
960
if(not WIFEXITED(proc->status)
827
961
or WEXITSTATUS(proc->status) != 0){
828
962
/* Bad exit by plugin */
963
829
964
if(debug){
830
965
if(WIFEXITED(proc->status)){
831
fprintf(stderr, "Plugin %u exited with status %d\n",
832
(unsigned int) (proc->pid),
966
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
967
" status %d\n", proc->name,
968
(intmax_t) (proc->pid),
833
969
WEXITSTATUS(proc->status));
834
} else if(WIFSIGNALED(proc->status)) {
835
fprintf(stderr, "Plugin %u killed by signal %d\n",
836
(unsigned int) (proc->pid),
970
} else if(WIFSIGNALED(proc->status)){
971
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
972
" signal %d\n", proc->name,
973
(intmax_t) (proc->pid),
837
974
WTERMSIG(proc->status));
838
975
} else if(WCOREDUMP(proc->status)){
839
fprintf(stderr, "Plugin %d dumped core\n",
840
(unsigned int) (proc->pid));
976
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
977
" core\n", proc->name, (intmax_t) (proc->pid));
841
978
}
842
979
}
980
843
981
/* Remove the plugin */
844
982
FD_CLR(proc->fd, &rfds_all);
983
845
984
/* Block signal while modifying process_list */
846
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
985
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
847
986
if(ret < 0){
848
987
perror("sigprocmask");
849
988
exitstatus = EXIT_FAILURE;
850
989
goto fallback;
851
990
}
852
/* Delete this process entry from the list */
853
if(process_list == proc){
854
/* First one - simple */
855
process_list = proc->next;
856
} else {
857
/* Second one or later */
858
for(process *p = process_list; p != NULL; p = p->next){
859
if(p->next == proc){
860
p->next = proc->next;
861
break;
862
}
863
}
864
}
991
992
plugin *next_plugin = proc->next;
993
free_plugin(proc);
994
proc = next_plugin;
995
865
996
/* We are done modifying process list, so unblock signal */
866
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
867
NULL);
997
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
998
NULL);
868
999
if(ret < 0){
869
1000
perror("sigprocmask");
870
}
871
free(proc->buffer);
872
free(proc);
873
/* We deleted this process from the list, so we can't go
874
proc->next. Therefore, start over from the beginning of
875
the process list */
876
break;
1001
exitstatus = EXIT_FAILURE;
1002
goto fallback;
1003
}
1004
1005
if(plugin_list == NULL){
1006
break;
1007
}
1008
1009
continue;
877
1010
}
1011
878
1012
/* This process exited nicely, so print its buffer */
879
880
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1013
1014
bool bret = print_out_password(proc->buffer,
1015
proc->buffer_length);
881
1016
if(not bret){
882
1017
perror("print_out_password");
883
1018
exitstatus = EXIT_FAILURE;
884
1019
}
885
1020
goto fallback;
886
1021
}
1022
887
1023
/* This process has not completed. Does it have any output? */
888
1024
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
889
1025
/* This process had nothing to say at this time */
1026
proc = proc->next;
890
1027
continue;
891
1028
}
892
1029
/* Before reading, make the process' data buffer large enough */
893
1030
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
894
1031
proc->buffer = realloc(proc->buffer, proc->buffer_size
895
1032
+ (size_t) BUFFER_SIZE);
896
if (proc->buffer == NULL){
1033
if(proc->buffer == NULL){
897
1034
perror("malloc");
898
1035
exitstatus = EXIT_FAILURE;
899
1036
goto fallback;
901
1038
proc->buffer_size += BUFFER_SIZE;
902
1039
}
903
1040
/* Read from the process */
904
ret = read(proc->fd, proc->buffer + proc->buffer_length,
905
BUFFER_SIZE);
906
if(ret < 0){
1041
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1042
BUFFER_SIZE);
1043
if(sret < 0){
907
1044
/* Read error from this process; ignore the error */
1045
proc = proc->next;
908
1046
continue;
909
1047
}
910
if(ret == 0){
1048
if(sret == 0){
911
1049
/* got EOF */
912
1050
proc->eof = true;
913
1051
} else {
914
proc->buffer_length += (size_t) ret;
1052
proc->buffer_length += (size_t) sret;
915
1053
}
916
1054
}
917
1055
}
919
1057
920
1058
fallback:
921
1059
922
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
923
/* Fallback if all plugins failed, none are found or an error occured */
1060
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1061
/* Fallback if all plugins failed, none are found or an error
1062
occured */
924
1063
bool bret;
925
1064
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
926
1065
char *passwordbuffer = getpass("Password: ");
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1066
size_t len = strlen(passwordbuffer);
1067
/* Strip trailing newline */
1068
if(len > 0 and passwordbuffer[len-1] == '\n'){
1069
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1070
len--;
1071
}
1072
bret = print_out_password(passwordbuffer, len);
928
1073
if(not bret){
929
1074
perror("print_out_password");
930
1075
exitstatus = EXIT_FAILURE;
937
1082
perror("sigaction");
938
1083
exitstatus = EXIT_FAILURE;
939
1084
}
940
1085
941
1086
if(custom_argv != NULL){
942
for(char **arg = custom_argv; *arg != NULL; arg++){
1087
for(char **arg = custom_argv+1; *arg != NULL; arg++){
943
1088
free(*arg);
944
1089
}
945
1090
free(custom_argv);
946
1091
}
947
free_plugin_list(plugin_list);
948
1092
949
1093
if(dir != NULL){
950
1094
closedir(dir);
951
1095
}
952
1096
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
960
perror("kill");
1097
/* Kill the processes */
1098
for(plugin *p = plugin_list; p != NULL; p = p->next){
1099
if(p->pid != 0){
1100
close(p->fd);
1101
ret = kill(p->pid, SIGTERM);
1102
if(ret == -1 and errno != ESRCH){
1103
/* Set-uid proccesses might not get closed */
1104
perror("kill");
1105
}
961
1106
}
962
free(process_list->buffer);
963
free(process_list);
964
1107
}
965
1108
966
1109
/* Wait for any remaining child processes to terminate */
971
1114
perror("wait");
972
1115
}
973
1116
1117
free_plugin_list();
1118
1119
free(plugindir);
1120
free(argfile);
1121
974
1122
return exitstatus;
975
1123
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0