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- Committer: Björn Påhlsson
- Date: 2008-08-16 20:31:21 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 80.
- Revision ID: belorn@braxen-20080816203121-u3uavdi14y1xjj0b
updated some partial manual pages
- files added:
- network-protocol.txt
- 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,
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
59
58
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
60
#include <signal.h> /* struct sigaction, sigemptyset(),
63
61
sigaddset(), sigaction(),
64
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
63
SIG_UNBLOCK, kill() */
66
64
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
68
65
69
66
#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;
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
75
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
77
86
typedef struct plugin{
78
87
char *name; /* can be NULL or any plugin name */
79
88
char **argv;
81
90
char **environ;
82
91
int envc;
83
92
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 bool completed;
93
volatile int status;
94
93
struct plugin *next;
95
94
} plugin;
96
95
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))){
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))){
106
100
return p;
107
101
}
108
102
}
109
103
/* Create a new plugin */
110
104
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
105
if (new_plugin == NULL){
112
106
return NULL;
113
107
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
free(new_plugin);
119
return NULL;
120
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
121
111
}
122
112
123
113
*new_plugin = (plugin) { .name = copy_name,
124
114
.argc = 1,
115
.envc = 0,
125
116
.disabled = false,
126
.next = plugin_list };
117
.next = *plugin_list };
127
118
128
119
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
130
free(copy_name);
120
if (new_plugin->argv == NULL){
131
121
free(new_plugin);
132
122
return NULL;
133
123
}
134
124
new_plugin->argv[0] = copy_name;
135
125
new_plugin->argv[1] = NULL;
136
126
137
127
new_plugin->environ = malloc(sizeof(char *));
138
128
if(new_plugin->environ == NULL){
139
free(copy_name);
140
129
free(new_plugin->argv);
141
130
free(new_plugin);
142
131
return NULL;
143
132
}
144
133
new_plugin->environ[0] = NULL;
145
146
134
/* Append the new plugin to the list */
147
plugin_list = new_plugin;
135
*plugin_list = new_plugin;
148
136
return new_plugin;
149
137
}
150
138
180
168
}
181
169
182
170
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
171
static bool add_environment(plugin *p, const char *def){
184
172
if(p == NULL){
185
173
return false;
186
174
}
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
175
return add_to_char_array(def, &(p->environ), &(p->envc));
205
176
}
206
177
178
207
179
/*
208
180
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
181
* Descriptor Flags".
210
182
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
183
*/
212
static int set_cloexec_flag(int fd){
184
static int set_cloexec_flag(int fd)
185
{
213
186
int ret = fcntl(fd, F_GETFD, 0);
214
187
/* If reading the flags failed, return error indication now. */
215
188
if(ret < 0){
219
192
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
193
}
221
194
195
process *process_list = NULL;
222
196
223
/* Mark processes as completed when they exit, and save their exit
197
/* Mark a process as completed when it exits, and save its exit
224
198
status. */
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if(errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
199
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
201
int status;
202
pid_t pid = wait(&status);
203
if(pid == -1){
204
perror("wait");
205
return;
206
}
207
while(proc != NULL and proc->pid != pid){
208
proc = proc->next;
209
}
210
if(proc == NULL){
211
/* Process not found in process list */
212
return;
213
}
214
proc->status = status;
215
proc->completed = true;
253
216
}
254
217
255
/* Prints out a password to stdout */
256
static bool print_out_password(const char *buffer, size_t length){
218
bool print_out_password(const char *buffer, size_t length){
257
219
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
258
223
for(size_t written = 0; written < length; written += (size_t)ret){
259
224
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
225
length - written));
265
230
return true;
266
231
}
267
232
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
280
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
233
char **add_to_argv(char **argv, int *argc, char *arg){
234
if (argv == NULL){
235
*argc = 1;
236
argv = malloc(sizeof(char*) * 2);
237
if(argv == NULL){
238
return NULL;
292
239
}
293
}
294
295
free(plugin_node);
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
241
argv[1] = NULL;
242
}
243
*argc += 1;
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
246
if(argv == NULL){
247
return NULL;
248
}
249
argv[*argc-1] = arg;
250
argv[*argc] = NULL;
251
return argv;
296
252
}
297
253
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
301
}
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
259
free(*arg);
260
}
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
263
free(*env);
264
}
265
free(plugin_list->environ);
266
free(plugin_list);
267
}
302
268
}
303
269
304
270
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
307
273
FILE *conffp;
308
274
size_t d_name_len;
309
275
DIR *dir = NULL;
310
276
struct dirent *dirst;
311
277
struct stat st;
312
278
fd_set rfds_all;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
279
int ret, maxfd = 0;
316
280
uid_t uid = 65534;
317
281
gid_t gid = 65534;
318
282
bool debug = false;
334
298
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
335
299
if(ret == -1){
336
300
perror("sigaction");
337
exitstatus = EXIT_FAILURE;
301
exitstatus = EXIT_FAILURE;
338
302
goto fallback;
339
303
}
340
304
343
307
{ .name = "global-options", .key = 'g',
344
308
.arg = "OPTION[,OPTION[,...]]",
345
309
.doc = "Options passed to all plugins" },
346
{ .name = "global-env", .key = 'G',
310
{ .name = "global-envs", .key = 'e',
347
311
.arg = "VAR=value",
348
312
.doc = "Environment variable passed to all plugins" },
349
313
{ .name = "options-for", .key = 'o',
350
314
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
351
315
.doc = "Options passed only to specified plugin" },
352
{ .name = "env-for", .key = 'E',
316
{ .name = "envs-for", .key = 'f',
353
317
.arg = "PLUGIN:ENV=value",
354
318
.doc = "Environment variable passed to specified plugin" },
355
319
{ .name = "disable", .key = 'd',
356
320
.arg = "PLUGIN",
357
321
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
361
322
{ .name = "plugin-dir", .key = 128,
362
323
.arg = "DIRECTORY",
363
324
.doc = "Specify a different plugin directory", .group = 2 },
364
{ .name = "config-file", .key = 129,
365
.arg = "FILE",
366
.doc = "Specify a different configuration file", .group = 2 },
367
{ .name = "userid", .key = 130,
368
.arg = "ID", .flags = 0,
369
.doc = "User ID the plugins will run as", .group = 3 },
370
{ .name = "groupid", .key = 131,
371
.arg = "ID", .flags = 0,
372
.doc = "Group ID the plugins will run as", .group = 3 },
373
{ .name = "debug", .key = 132,
374
.doc = "Debug mode", .group = 4 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.doc = "Debug mode", .group = 3 },
375
333
{ .name = NULL }
376
334
};
377
335
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
380
switch(key) {
381
case 'g': /* --global-options */
382
if(arg != NULL){
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
383
343
char *p;
384
344
while((p = strsep(&arg, ",")) != NULL){
385
345
if(p[0] == '\0'){
386
346
continue;
387
347
}
388
if(not add_argument(getplugin(NULL), p)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
389
349
perror("add_argument");
390
350
return ARGP_ERR_UNKNOWN;
391
351
}
392
352
}
393
353
}
394
354
break;
395
case 'G': /* --global-env */
355
case 'e':
396
356
if(arg == NULL){
397
357
break;
398
358
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
401
367
}
402
368
break;
403
case 'o': /* --options-for */
404
if(arg != NULL){
369
case 'o':
370
if (arg != NULL){
405
371
char *p_name = strsep(&arg, ":");
406
if(p_name[0] == '\0' or arg == NULL){
372
if(p_name[0] == '\0'){
407
373
break;
408
374
}
409
375
char *opt = strsep(&arg, ":");
410
if(opt[0] == '\0' or opt == NULL){
376
if(opt[0] == '\0'){
411
377
break;
412
378
}
413
char *p;
414
while((p = strsep(&opt, ",")) != NULL){
415
if(p[0] == '\0'){
416
continue;
417
}
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
return ARGP_ERR_UNKNOWN;
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
421
389
}
422
390
}
423
391
}
424
392
break;
425
case 'E': /* --env-for */
393
case 'f':
426
394
if(arg == NULL){
427
395
break;
428
396
}
431
399
if(envdef == NULL){
432
400
break;
433
401
}
434
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
436
408
perror("add_environment");
437
409
}
438
410
}
439
411
break;
440
case 'd': /* --disable */
441
if(arg != NULL){
442
plugin *p = getplugin(arg);
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
443
415
if(p == NULL){
444
416
return ARGP_ERR_UNKNOWN;
445
417
}
446
418
p->disabled = true;
447
419
}
448
420
break;
449
case 'e': /* --enable */
450
if(arg != NULL){
451
plugin *p = getplugin(arg);
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
454
}
455
p->disabled = false;
456
}
457
break;
458
case 128: /* --plugin-dir */
459
free(plugindir);
460
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
464
break;
465
case 129: /* --config-file */
466
/* This is already done by parse_opt_config_file() */
467
break;
468
case 130: /* --userid */
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
476
}
477
break;
478
case 131: /* --groupid */
479
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
486
}
487
break;
488
case 132: /* --debug */
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
425
uid = (uid_t)strtol(arg, NULL, 10);
426
break;
427
case 130:
428
gid = (gid_t)strtol(arg, NULL, 10);
429
break;
430
case 131:
489
431
debug = true;
490
432
break;
491
/*
492
* When adding more options before this line, remember to also add a
493
* "case" to the "parse_opt_config_file" function below.
494
*/
495
case ARGP_KEY_ARG:
496
/* Cryptsetup always passes an argument, which is an empty
497
string if "none" was specified in /etc/crypttab. So if
498
argument was empty, we ignore it silently. */
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
501
}
502
break;
503
case ARGP_KEY_END:
504
break;
505
default:
506
return ARGP_ERR_UNKNOWN;
507
}
508
return 0;
509
}
510
511
/* This option parser is the same as parse_opt() above, except it
512
ignores everything but the --config-file option. */
513
error_t parse_opt_config_file(int key, char *arg,
514
__attribute__((unused))
515
struct argp_state *state) {
516
switch(key) {
517
case 'g': /* --global-options */
518
case 'G': /* --global-env */
519
case 'o': /* --options-for */
520
case 'E': /* --env-for */
521
case 'd': /* --disable */
522
case 'e': /* --enable */
523
case 128: /* --plugin-dir */
524
break;
525
case 129: /* --config-file */
526
free(argfile);
527
argfile = strdup(arg);
528
if(argfile == NULL){
529
perror("strdup");
530
}
531
break;
532
case 130: /* --userid */
533
case 131: /* --groupid */
534
case 132: /* --debug */
535
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
537
break;
538
default:
539
return ARGP_ERR_UNKNOWN;
540
}
541
return 0;
542
}
543
544
struct argp argp = { .options = options,
545
.parser = parse_opt_config_file,
546
.args_doc = "",
433
case ARGP_KEY_ARG:
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
435
break;
436
case ARGP_KEY_END:
437
break;
438
default:
439
return ARGP_ERR_UNKNOWN;
440
}
441
return 0;
442
}
443
444
plugin *plugin_list = NULL;
445
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
547
448
.doc = "Mandos plugin runner -- Run plugins" };
548
449
549
/* Parse using parse_opt_config_file() in order to get the custom
550
config file location, if any. */
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
451
if (ret == ARGP_ERR_UNKNOWN){
553
452
fprintf(stderr, "Unknown error while parsing arguments\n");
554
453
exitstatus = EXIT_FAILURE;
555
454
goto fallback;
556
455
}
557
558
/* Reset to the normal argument parser */
559
argp.parser = parse_opt;
560
561
/* Open the configfile if available */
562
if(argfile == NULL){
563
conffp = fopen(AFILE, "r");
564
} else {
565
conffp = fopen(argfile, "r");
566
}
456
457
conffp = fopen(argfile, "r");
567
458
if(conffp != NULL){
568
459
char *org_line = NULL;
569
460
char *p, *arg, *new_arg, *line;
570
461
size_t size = 0;
462
ssize_t sret;
571
463
const char whitespace_delims[] = " \r\t\f\v\n";
572
464
const char comment_delim[] = "#";
573
465
574
custom_argc = 1;
575
custom_argv = malloc(sizeof(char*) * 2);
576
if(custom_argv == NULL){
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
579
goto fallback;
580
}
581
custom_argv[0] = argv[0];
582
custom_argv[1] = NULL;
583
584
/* for each line in the config file, strip whitespace and ignore
585
commented text */
586
466
while(true){
587
467
sret = getline(&org_line, &size, conffp);
588
468
if(sret == -1){
596
476
continue;
597
477
}
598
478
new_arg = strdup(p);
599
if(new_arg == NULL){
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
602
free(org_line);
603
goto fallback;
604
}
605
606
custom_argc += 1;
607
custom_argv = realloc(custom_argv, sizeof(char *)
608
* ((unsigned int) custom_argc + 1));
609
if(custom_argv == NULL){
610
perror("realloc");
611
exitstatus = EXIT_FAILURE;
612
free(org_line);
613
goto fallback;
614
}
615
custom_argv[custom_argc-1] = new_arg;
616
custom_argv[custom_argc] = NULL;
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
483
goto fallback;
484
}
617
485
}
618
486
}
619
487
free(org_line);
620
} else {
488
} else{
621
489
/* Check for harmful errors and go to fallback. Other errors might
622
490
not affect opening plugins */
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
624
492
perror("fopen");
625
493
exitstatus = EXIT_FAILURE;
626
494
goto fallback;
627
495
}
628
496
}
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
497
631
498
if(custom_argv != NULL){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
501
if (ret == ARGP_ERR_UNKNOWN){
635
502
fprintf(stderr, "Unknown error while parsing arguments\n");
636
503
exitstatus = EXIT_FAILURE;
637
504
goto fallback;
638
505
}
639
506
}
640
507
641
/* Parse actual command line arguments, to let them override the
642
config file */
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
648
}
649
650
508
if(debug){
651
509
for(plugin *p = plugin_list; p != NULL; p=p->next){
652
510
fprintf(stderr, "Plugin: %s has %d arguments\n",
654
512
for(char **a = p->argv; *a != NULL; a++){
655
513
fprintf(stderr, "\tArg: %s\n", *a);
656
514
}
657
fprintf(stderr, "...and %d environment variables\n", p->envc);
515
fprintf(stderr, "...and %u environment variables\n", p->envc);
658
516
for(char **a = p->environ; *a != NULL; a++){
659
517
fprintf(stderr, "\t%s\n", *a);
660
518
}
661
519
}
662
520
}
663
521
664
/* Strip permissions down to nobody */
665
522
ret = setuid(uid);
666
if(ret == -1){
523
if (ret == -1){
667
524
perror("setuid");
668
}
525
}
526
669
527
setgid(gid);
670
if(ret == -1){
528
if (ret == -1){
671
529
perror("setgid");
672
530
}
673
531
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
532
dir = opendir(plugindir);
680
533
if(dir == NULL){
681
534
perror("Could not open plugin dir");
682
535
exitstatus = EXIT_FAILURE;
698
551
699
552
FD_ZERO(&rfds_all);
700
553
701
/* Read and execute any executable in the plugin directory*/
702
554
while(true){
703
555
dirst = readdir(dir);
704
556
705
/* All directory entries have been processed */
557
// All directory entries have been processed
706
558
if(dirst == NULL){
707
if(errno == EBADF){
559
if (errno == EBADF){
708
560
perror("readdir");
709
561
exitstatus = EXIT_FAILURE;
710
562
goto fallback;
714
566
715
567
d_name_len = strlen(dirst->d_name);
716
568
717
/* Ignore dotfiles, backup files and other junk */
569
// Ignore dotfiles, backup files and other junk
718
570
{
719
571
bool bad_name = false;
720
572
722
574
723
575
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
724
576
".dpkg-old",
725
".dpkg-bak",
726
577
".dpkg-divert", NULL };
727
578
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
728
579
size_t pre_len = strlen(*pre);
736
587
break;
737
588
}
738
589
}
590
739
591
if(bad_name){
740
592
continue;
741
593
}
594
742
595
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
743
596
size_t suf_len = strlen(*suf);
744
597
if((d_name_len >= suf_len)
759
612
}
760
613
761
614
char *filename;
762
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
}
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
767
616
if(ret < 0){
768
617
perror("asprintf");
769
618
continue;
770
619
}
771
620
772
621
ret = stat(filename, &st);
773
if(ret == -1){
622
if (ret == -1){
774
623
perror("stat");
775
624
free(filename);
776
625
continue;
777
626
}
778
779
/* Ignore non-executable files */
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
627
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
781
629
if(debug){
782
630
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
631
" with bad type or mode\n", filename);
785
633
free(filename);
786
634
continue;
787
635
}
788
789
plugin *p = getplugin(dirst->d_name);
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
790
637
if(p == NULL){
791
638
perror("getplugin");
792
639
free(filename);
802
649
}
803
650
{
804
651
/* Add global arguments to argument list for this plugin */
805
plugin *g = getplugin(NULL);
652
plugin *g = getplugin(NULL, &plugin_list);
806
653
if(g != NULL){
807
654
for(char **a = g->argv + 1; *a != NULL; a++){
808
655
if(not add_argument(p, *a)){
811
658
}
812
659
/* Add global environment variables */
813
660
for(char **e = g->environ; *e != NULL; e++){
814
if(not add_environment(p, *e, false)){
661
if(not add_environment(p, *e)){
815
662
perror("add_environment");
816
663
}
817
664
}
822
669
process, too. */
823
670
if(p->environ[0] != NULL){
824
671
for(char **e = environ; *e != NULL; e++){
825
if(not add_environment(p, *e, false)){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
826
678
perror("add_environment");
827
679
}
828
680
}
829
681
}
830
682
831
int pipefd[2];
683
int pipefd[2];
832
684
ret = pipe(pipefd);
833
if(ret == -1){
685
if (ret == -1){
834
686
perror("pipe");
835
687
exitstatus = EXIT_FAILURE;
836
688
goto fallback;
837
689
}
838
/* Ask OS to automatic close the pipe on exec */
839
690
ret = set_cloexec_flag(pipefd[0]);
840
691
if(ret < 0){
841
692
perror("set_cloexec_flag");
849
700
goto fallback;
850
701
}
851
702
/* Block SIGCHLD until process is safely in process list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
703
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
704
if(ret < 0){
854
705
perror("sigprocmask");
855
706
exitstatus = EXIT_FAILURE;
856
707
goto fallback;
857
708
}
858
/* Starting a new process to be watched */
709
// Starting a new process to be watched
859
710
pid_t pid = fork();
860
711
if(pid == -1){
861
712
perror("fork");
869
720
perror("sigaction");
870
721
_exit(EXIT_FAILURE);
871
722
}
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
723
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
873
724
if(ret < 0){
874
725
perror("sigprocmask");
875
726
_exit(EXIT_FAILURE);
876
727
}
877
728
878
729
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
879
730
if(ret == -1){
880
731
perror("dup2");
899
750
}
900
751
/* no return */
901
752
}
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
753
/* parent process */
904
754
free(filename);
905
plugin *new_plugin = getplugin(dirst->d_name);
906
if(new_plugin == NULL){
907
perror("getplugin");
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
758
perror("malloc");
759
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
909
760
if(ret < 0){
910
perror("sigprocmask");
761
perror("sigprocmask");
911
762
}
912
763
exitstatus = EXIT_FAILURE;
913
764
goto fallback;
914
765
}
915
766
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
919
772
/* Unblock SIGCHLD so signal handler can be run if this process
920
773
has already completed */
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
922
775
if(ret < 0){
923
776
perror("sigprocmask");
924
777
exitstatus = EXIT_FAILURE;
925
778
goto fallback;
926
779
}
927
780
928
FD_SET(new_plugin->fd, &rfds_all);
781
FD_SET(new_process->fd, &rfds_all);
929
782
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
932
785
}
786
933
787
}
934
788
789
free_plugin_list(plugin_list);
790
935
791
closedir(dir);
936
792
dir = NULL;
937
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
947
798
}
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
799
while(process_list){
951
800
fd_set rfds = rfds_all;
952
801
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
802
if (select_ret == -1){
954
803
perror("select");
955
804
exitstatus = EXIT_FAILURE;
956
805
goto fallback;
957
806
}
958
807
/* OK, now either a process completed, or something can be read
959
808
from one of them */
960
for(plugin *proc = plugin_list; proc != NULL;){
809
for(process *proc = process_list; proc ; proc = proc->next){
961
810
/* Is this process completely done? */
962
811
if(proc->eof and proc->completed){
963
812
/* Only accept the plugin output if it exited cleanly */
964
813
if(not WIFEXITED(proc->status)
965
814
or WEXITSTATUS(proc->status) != 0){
966
815
/* Bad exit by plugin */
967
968
816
if(debug){
969
817
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
818
fprintf(stderr, "Plugin %u exited with status %d\n",
819
(unsigned int) (proc->pid),
972
820
WEXITSTATUS(proc->status));
973
821
} else if(WIFSIGNALED(proc->status)) {
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
822
fprintf(stderr, "Plugin %u killed by signal %d\n",
823
(unsigned int) (proc->pid),
976
824
WTERMSIG(proc->status));
977
825
} else if(WCOREDUMP(proc->status)){
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
826
fprintf(stderr, "Plugin %d dumped core\n",
827
(unsigned int) (proc->pid));
980
828
}
981
829
}
982
983
830
/* Remove the plugin */
984
831
FD_CLR(proc->fd, &rfds_all);
985
986
832
/* Block signal while modifying process_list */
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
834
if(ret < 0){
989
835
perror("sigprocmask");
990
836
exitstatus = EXIT_FAILURE;
991
837
goto fallback;
992
838
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
843
} else {
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
846
if(p->next == proc){
847
p->next = proc->next;
848
break;
849
}
850
}
851
}
998
852
/* We are done modifying process list, so unblock signal */
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
NULL);
1001
855
if(ret < 0){
1002
856
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
continue;
857
}
858
free(proc->buffer);
859
free(proc);
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
862
the process list */
863
break;
1012
864
}
1013
1014
865
/* This process exited nicely, so print its buffer */
1015
1016
bool bret = print_out_password(proc->buffer,
1017
proc->buffer_length);
866
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1018
868
if(not bret){
1019
869
perror("print_out_password");
1020
870
exitstatus = EXIT_FAILURE;
1021
871
}
1022
872
goto fallback;
1023
873
}
1024
1025
874
/* This process has not completed. Does it have any output? */
1026
875
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1027
876
/* This process had nothing to say at this time */
1028
proc = proc->next;
1029
877
continue;
1030
878
}
1031
879
/* Before reading, make the process' data buffer large enough */
1032
880
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1033
881
proc->buffer = realloc(proc->buffer, proc->buffer_size
1034
882
+ (size_t) BUFFER_SIZE);
1035
if(proc->buffer == NULL){
883
if (proc->buffer == NULL){
1036
884
perror("malloc");
1037
885
exitstatus = EXIT_FAILURE;
1038
886
goto fallback;
1040
888
proc->buffer_size += BUFFER_SIZE;
1041
889
}
1042
890
/* Read from the process */
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
891
ret = read(proc->fd, proc->buffer + proc->buffer_length,
892
BUFFER_SIZE);
893
if(ret < 0){
1046
894
/* Read error from this process; ignore the error */
1047
proc = proc->next;
1048
895
continue;
1049
896
}
1050
if(sret == 0){
897
if(ret == 0){
1051
898
/* got EOF */
1052
899
proc->eof = true;
1053
900
} else {
1054
proc->buffer_length += (size_t) sret;
901
proc->buffer_length += (size_t) ret;
1055
902
}
1056
903
}
1057
904
}
1059
906
1060
907
fallback:
1061
908
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1063
/* Fallback if all plugins failed, none are found or an error
1064
occured */
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1065
911
bool bret;
1066
912
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1067
913
char *passwordbuffer = getpass("Password: ");
1068
size_t len = strlen(passwordbuffer);
1069
/* Strip trailing newline */
1070
if(len > 0 and passwordbuffer[len-1] == '\n'){
1071
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1072
len--;
1073
}
1074
bret = print_out_password(passwordbuffer, len);
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1075
915
if(not bret){
1076
916
perror("print_out_password");
1077
917
exitstatus = EXIT_FAILURE;
1084
924
perror("sigaction");
1085
925
exitstatus = EXIT_FAILURE;
1086
926
}
1087
927
1088
928
if(custom_argv != NULL){
1089
for(char **arg = custom_argv+1; *arg != NULL; arg++){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1090
930
free(*arg);
1091
931
}
1092
932
free(custom_argv);
1093
933
}
934
free_plugin_list(plugin_list);
1094
935
1095
936
if(dir != NULL){
1096
937
closedir(dir);
1097
938
}
1098
939
1099
/* Kill the processes */
1100
for(plugin *p = plugin_list; p != NULL; p = p->next){
1101
if(p->pid != 0){
1102
close(p->fd);
1103
ret = kill(p->pid, SIGTERM);
1104
if(ret == -1 and errno != ESRCH){
1105
/* Set-uid proccesses might not get closed */
1106
perror("kill");
1107
}
940
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
947
perror("kill");
1108
948
}
949
free(process_list->buffer);
950
free(process_list);
1109
951
}
1110
952
1111
953
/* Wait for any remaining child processes to terminate */
1116
958
perror("wait");
1117
959
}
1118
960
1119
free_plugin_list();
1120
1121
free(plugindir);
1122
free(argfile);
1123
1124
961
return exitstatus;
1125
962
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0