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- Committer: Björn Påhlsson
- Date: 2009-02-08 01:50:24 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: belorn@braxen-20090208015024-jewaulcqtxvbopq6
Fixed a bug in fallback handling
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- 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;
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
86
77
typedef struct plugin{
87
78
char *name; /* can be NULL or any plugin name */
88
79
char **argv;
90
81
char **environ;
91
82
int envc;
92
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;
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
*new_plugin = (plugin) { .name = name,
109
.argc = 1,
110
.envc = 0,
111
.disabled = false,
112
.next = *plugin_list };
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
}
121
}
122
123
*new_plugin = (plugin){ .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
113
127
114
128
new_plugin->argv = malloc(sizeof(char *) * 2);
115
if (new_plugin->argv == NULL){
129
if(new_plugin->argv == NULL){
130
free(copy_name);
116
131
free(new_plugin);
117
132
return NULL;
118
133
}
119
new_plugin->argv[0] = name;
134
new_plugin->argv[0] = copy_name;
120
135
new_plugin->argv[1] = NULL;
121
136
122
137
new_plugin->environ = malloc(sizeof(char *));
123
138
if(new_plugin->environ == NULL){
139
free(copy_name);
124
140
free(new_plugin->argv);
125
141
free(new_plugin);
126
142
return NULL;
127
143
}
128
144
new_plugin->environ[0] = NULL;
145
129
146
/* Append the new plugin to the list */
130
*plugin_list = new_plugin;
147
plugin_list = new_plugin;
131
148
return new_plugin;
132
149
}
133
150
163
180
}
164
181
165
182
/* Add to a plugin's environment */
166
static bool add_environment(plugin *p, const char *def){
183
static bool add_environment(plugin *p, const char *def, bool replace){
167
184
if(p == NULL){
168
185
return false;
169
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
}
170
204
return add_to_char_array(def, &(p->environ), &(p->envc));
171
205
}
172
206
173
174
207
/*
175
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
176
209
* Descriptor Flags".
177
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
178
211
*/
179
static int set_cloexec_flag(int fd)
180
{
212
static int set_cloexec_flag(int fd){
181
213
int ret = fcntl(fd, F_GETFD, 0);
182
214
/* If reading the flags failed, return error indication now. */
183
215
if(ret < 0){
187
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
188
220
}
189
221
190
process *process_list = NULL;
191
222
192
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
193
224
status. */
194
void handle_sigchld(__attribute__((unused)) int sig){
195
process *proc = process_list;
196
int status;
197
pid_t pid = wait(&status);
198
if(pid == -1){
199
perror("wait");
200
return;
201
}
202
while(proc != NULL and proc->pid != pid){
203
proc = proc->next;
204
}
205
if(proc == NULL){
206
/* Process not found in process list */
207
return;
208
}
209
proc->status = status;
210
proc->completed = true;
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
int old_errno = errno;
227
while(true){
228
plugin *proc = plugin_list;
229
int status;
230
pid_t pid = waitpid(-1, &status, WNOHANG);
231
if(pid == 0){
232
/* Only still running child processes */
233
break;
234
}
235
if(pid == -1){
236
if(errno == ECHILD){
237
/* No child processes */
238
break;
239
}
240
perror("waitpid");
241
}
242
243
/* A child exited, find it in process_list */
244
while(proc != NULL and proc->pid != pid){
245
proc = proc->next;
246
}
247
if(proc == NULL){
248
/* Process not found in process list */
249
continue;
250
}
251
proc->status = status;
252
proc->completed = 1;
253
}
254
errno = old_errno;
211
255
}
212
256
213
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){
214
259
ssize_t ret;
215
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
218
260
for(size_t written = 0; written < length; written += (size_t)ret){
219
261
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
220
262
length - written));
225
267
return true;
226
268
}
227
269
228
char **add_to_argv(char **argv, int *argc, char *arg){
229
if (argv == NULL){
230
*argc = 1;
231
argv = malloc(sizeof(char*) * 2);
232
if(argv == NULL){
233
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
}
234
294
}
235
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
236
argv[1] = NULL;
237
}
238
*argc += 1;
239
argv = realloc(argv, sizeof(char *)
240
* ((unsigned int) *argc + 1));
241
if(argv == NULL){
242
return NULL;
243
}
244
argv[*argc-1] = arg;
245
argv[*argc] = NULL;
246
return argv;
295
}
296
297
free(plugin_node);
298
}
299
300
static void free_plugin_list(void){
301
while(plugin_list != NULL){
302
free_plugin(plugin_list);
303
}
247
304
}
248
305
249
306
int main(int argc, char *argv[]){
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
307
char *plugindir = NULL;
308
char *argfile = NULL;
252
309
FILE *conffp;
253
310
size_t d_name_len;
254
311
DIR *dir = NULL;
255
312
struct dirent *dirst;
256
313
struct stat st;
257
314
fd_set rfds_all;
258
int ret, maxfd = 0;
315
int ret, numchars, maxfd = 0;
316
ssize_t sret;
317
intmax_t tmpmax;
259
318
uid_t uid = 65534;
260
319
gid_t gid = 65534;
261
320
bool debug = false;
269
328
/* Establish a signal handler */
270
329
sigemptyset(&sigchld_action.sa_mask);
271
330
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
272
if(ret < 0){
331
if(ret == -1){
273
332
perror("sigaddset");
274
exit(EXIT_FAILURE);
333
exitstatus = EXIT_FAILURE;
334
goto fallback;
275
335
}
276
336
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
277
if(ret < 0){
337
if(ret == -1){
278
338
perror("sigaction");
279
exit(EXIT_FAILURE);
339
exitstatus = EXIT_FAILURE;
340
goto fallback;
280
341
}
281
342
282
343
/* The options we understand. */
284
345
{ .name = "global-options", .key = 'g',
285
346
.arg = "OPTION[,OPTION[,...]]",
286
347
.doc = "Options passed to all plugins" },
287
{ .name = "global-envs", .key = 'e',
348
{ .name = "global-env", .key = 'G',
288
349
.arg = "VAR=value",
289
350
.doc = "Environment variable passed to all plugins" },
290
351
{ .name = "options-for", .key = 'o',
291
352
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
292
353
.doc = "Options passed only to specified plugin" },
293
{ .name = "envs-for", .key = 'f',
354
{ .name = "env-for", .key = 'E',
294
355
.arg = "PLUGIN:ENV=value",
295
356
.doc = "Environment variable passed to specified plugin" },
296
357
{ .name = "disable", .key = 'd',
297
358
.arg = "PLUGIN",
298
359
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
361
.arg = "PLUGIN",
362
.doc = "Enable a specific plugin", .group = 1 },
299
363
{ .name = "plugin-dir", .key = 128,
300
364
.arg = "DIRECTORY",
301
365
.doc = "Specify a different plugin directory", .group = 2 },
302
{ .name = "userid", .key = 129,
303
.arg = "ID", .flags = 0,
304
.doc = "User ID the plugins will run as", .group = 2 },
305
{ .name = "groupid", .key = 130,
306
.arg = "ID", .flags = 0,
307
.doc = "Group ID the plugins will run as", .group = 2 },
308
{ .name = "debug", .key = 131,
309
.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 },
310
377
{ .name = NULL }
311
378
};
312
379
313
error_t parse_opt (int key, char *arg, struct argp_state *state) {
314
/* Get the INPUT argument from `argp_parse', which we know is a
315
pointer to our plugin list pointer. */
316
plugin **plugins = state->input;
317
switch (key) {
318
case 'g':
319
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){
320
385
char *p;
321
386
while((p = strsep(&arg, ",")) != NULL){
322
387
if(p[0] == '\0'){
323
388
continue;
324
389
}
325
if(not add_argument(getplugin(NULL, plugins), p)){
390
if(not add_argument(getplugin(NULL), p)){
326
391
perror("add_argument");
327
392
return ARGP_ERR_UNKNOWN;
328
393
}
329
394
}
330
395
}
331
396
break;
332
case 'e':
397
case 'G': /* --global-env */
333
398
if(arg == NULL){
334
399
break;
335
400
}
336
{
337
char *envdef = strdup(arg);
338
if(envdef == NULL){
339
break;
340
}
341
if(not add_environment(getplugin(NULL, plugins), envdef)){
342
perror("add_environment");
343
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
344
403
}
345
404
break;
346
case 'o':
347
if (arg != NULL){
405
case 'o': /* --options-for */
406
if(arg != NULL){
348
407
char *p_name = strsep(&arg, ":");
349
if(p_name[0] == '\0'){
408
if(p_name[0] == '\0' or arg == NULL){
350
409
break;
351
410
}
352
411
char *opt = strsep(&arg, ":");
353
if(opt[0] == '\0'){
412
if(opt[0] == '\0' or opt == NULL){
354
413
break;
355
414
}
356
if(opt != NULL){
357
char *p;
358
while((p = strsep(&opt, ",")) != NULL){
359
if(p[0] == '\0'){
360
continue;
361
}
362
if(not add_argument(getplugin(p_name, plugins), p)){
363
perror("add_argument");
364
return ARGP_ERR_UNKNOWN;
365
}
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;
366
423
}
367
424
}
368
425
}
369
426
break;
370
case 'f':
427
case 'E': /* --env-for */
371
428
if(arg == NULL){
372
429
break;
373
430
}
376
433
if(envdef == NULL){
377
434
break;
378
435
}
379
char *p_name = strndup(arg, (size_t) (envdef-arg));
380
if(p_name == NULL){
381
break;
382
}
383
envdef++;
384
if(not add_environment(getplugin(p_name, plugins), envdef)){
436
*envdef = '\0';
437
if(not add_environment(getplugin(arg), envdef+1, true)){
385
438
perror("add_environment");
386
439
}
387
440
}
388
441
break;
389
case 'd':
390
if (arg != NULL){
391
plugin *p = getplugin(arg, plugins);
442
case 'd': /* --disable */
443
if(arg != NULL){
444
plugin *p = getplugin(arg);
392
445
if(p == NULL){
393
446
return ARGP_ERR_UNKNOWN;
394
447
}
395
448
p->disabled = true;
396
449
}
397
450
break;
398
case 128:
399
plugindir = arg;
400
break;
401
case 129:
402
uid = (uid_t)strtol(arg, NULL, 10);
403
break;
404
case 130:
405
gid = (gid_t)strtol(arg, NULL, 10);
406
break;
407
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 */
408
491
debug = true;
409
492
break;
410
case ARGP_KEY_ARG:
411
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
412
break;
413
case ARGP_KEY_END:
414
break;
415
default:
416
return ARGP_ERR_UNKNOWN;
417
}
418
return 0;
419
}
420
421
plugin *plugin_list = NULL;
422
423
struct argp argp = { .options = options, .parser = parse_opt,
424
.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 = "",
425
549
.doc = "Mandos plugin runner -- Run plugins" };
426
550
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
428
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){
429
555
fprintf(stderr, "Unknown error while parsing arguments\n");
430
556
exitstatus = EXIT_FAILURE;
431
goto end;
557
goto fallback;
432
558
}
433
434
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
}
435
569
if(conffp != NULL){
436
570
char *org_line = NULL;
571
char *p, *arg, *new_arg, *line;
437
572
size_t size = 0;
438
ssize_t sret;
439
char *p, *arg, *new_arg, *line;
440
573
const char whitespace_delims[] = " \r\t\f\v\n";
441
574
const char comment_delim[] = "#";
442
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 */
443
588
while(true){
444
589
sret = getline(&org_line, &size, conffp);
445
590
if(sret == -1){
453
598
continue;
454
599
}
455
600
new_arg = strdup(p);
456
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
457
if (custom_argv == NULL){
458
perror("add_to_argv");
459
exitstatus = EXIT_FAILURE;
460
goto end;
461
}
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;
462
619
}
463
620
}
464
621
free(org_line);
465
} else{
622
} else {
466
623
/* Check for harmful errors and go to fallback. Other errors might
467
624
not affect opening plugins */
468
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
469
626
perror("fopen");
470
627
exitstatus = EXIT_FAILURE;
471
goto end;
628
goto fallback;
472
629
}
473
630
}
474
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
475
633
if(custom_argv != NULL){
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
478
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){
479
637
fprintf(stderr, "Unknown error while parsing arguments\n");
480
638
exitstatus = EXIT_FAILURE;
481
goto end;
639
goto fallback;
482
640
}
483
641
}
484
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
485
652
if(debug){
486
653
for(plugin *p = plugin_list; p != NULL; p=p->next){
487
654
fprintf(stderr, "Plugin: %s has %d arguments\n",
489
656
for(char **a = p->argv; *a != NULL; a++){
490
657
fprintf(stderr, "\tArg: %s\n", *a);
491
658
}
492
fprintf(stderr, "...and %u environment variables\n", p->envc);
659
fprintf(stderr, "...and %d environment variables\n", p->envc);
493
660
for(char **a = p->environ; *a != NULL; a++){
494
661
fprintf(stderr, "\t%s\n", *a);
495
662
}
496
663
}
497
664
}
498
665
666
/* Strip permissions down to nobody */
667
setgid(gid);
668
if(ret == -1){
669
perror("setgid");
670
}
499
671
ret = setuid(uid);
500
if (ret == -1){
672
if(ret == -1){
501
673
perror("setuid");
502
674
}
503
675
504
setgid(gid);
505
if (ret == -1){
506
perror("setgid");
676
if(plugindir == NULL){
677
dir = opendir(PDIR);
678
} else {
679
dir = opendir(plugindir);
507
680
}
508
681
509
dir = opendir(plugindir);
510
682
if(dir == NULL){
511
683
perror("Could not open plugin dir");
512
684
exitstatus = EXIT_FAILURE;
513
goto end;
685
goto fallback;
514
686
}
515
687
516
688
/* Set the FD_CLOEXEC flag on the directory, if possible */
521
693
if(ret < 0){
522
694
perror("set_cloexec_flag");
523
695
exitstatus = EXIT_FAILURE;
524
goto end;
696
goto fallback;
525
697
}
526
698
}
527
699
}
528
700
529
701
FD_ZERO(&rfds_all);
530
702
703
/* Read and execute any executable in the plugin directory*/
531
704
while(true){
532
705
dirst = readdir(dir);
533
706
534
// All directory entries have been processed
707
/* All directory entries have been processed */
535
708
if(dirst == NULL){
536
if (errno == EBADF){
709
if(errno == EBADF){
537
710
perror("readdir");
538
711
exitstatus = EXIT_FAILURE;
539
goto end;
712
goto fallback;
540
713
}
541
714
break;
542
715
}
543
716
544
717
d_name_len = strlen(dirst->d_name);
545
718
546
// Ignore dotfiles, backup files and other junk
719
/* Ignore dotfiles, backup files and other junk */
547
720
{
548
721
bool bad_name = false;
549
722
551
724
552
725
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
553
726
".dpkg-old",
727
".dpkg-bak",
554
728
".dpkg-divert", NULL };
555
729
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
556
730
size_t pre_len = strlen(*pre);
564
738
break;
565
739
}
566
740
}
567
568
741
if(bad_name){
569
742
continue;
570
743
}
571
572
744
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
573
745
size_t suf_len = strlen(*suf);
574
746
if((d_name_len >= suf_len)
589
761
}
590
762
591
763
char *filename;
592
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
}
593
769
if(ret < 0){
594
770
perror("asprintf");
595
771
continue;
596
772
}
597
773
598
774
ret = stat(filename, &st);
599
if (ret == -1){
775
if(ret == -1){
600
776
perror("stat");
601
777
free(filename);
602
778
continue;
603
779
}
604
605
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)){
606
783
if(debug){
607
784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
608
785
" with bad type or mode\n", filename);
610
787
free(filename);
611
788
continue;
612
789
}
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
790
791
plugin *p = getplugin(dirst->d_name);
614
792
if(p == NULL){
615
793
perror("getplugin");
616
794
free(filename);
626
804
}
627
805
{
628
806
/* Add global arguments to argument list for this plugin */
629
plugin *g = getplugin(NULL, &plugin_list);
807
plugin *g = getplugin(NULL);
630
808
if(g != NULL){
631
809
for(char **a = g->argv + 1; *a != NULL; a++){
632
810
if(not add_argument(p, *a)){
635
813
}
636
814
/* Add global environment variables */
637
815
for(char **e = g->environ; *e != NULL; e++){
638
if(not add_environment(p, *e)){
816
if(not add_environment(p, *e, false)){
639
817
perror("add_environment");
640
818
}
641
819
}
646
824
process, too. */
647
825
if(p->environ[0] != NULL){
648
826
for(char **e = environ; *e != NULL; e++){
649
char *copy = strdup(*e);
650
if(copy == NULL){
651
perror("strdup");
652
continue;
653
}
654
if(not add_environment(p, copy)){
827
if(not add_environment(p, *e, false)){
655
828
perror("add_environment");
656
829
}
657
830
}
658
831
}
659
832
660
int pipefd[2];
833
int pipefd[2];
661
834
ret = pipe(pipefd);
662
if (ret == -1){
835
if(ret == -1){
663
836
perror("pipe");
664
837
exitstatus = EXIT_FAILURE;
665
goto end;
838
goto fallback;
666
839
}
840
/* Ask OS to automatic close the pipe on exec */
667
841
ret = set_cloexec_flag(pipefd[0]);
668
842
if(ret < 0){
669
843
perror("set_cloexec_flag");
670
844
exitstatus = EXIT_FAILURE;
671
goto end;
845
goto fallback;
672
846
}
673
847
ret = set_cloexec_flag(pipefd[1]);
674
848
if(ret < 0){
675
849
perror("set_cloexec_flag");
676
850
exitstatus = EXIT_FAILURE;
677
goto end;
851
goto fallback;
678
852
}
679
853
/* Block SIGCHLD until process is safely in process list */
680
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
681
855
if(ret < 0){
682
856
perror("sigprocmask");
683
857
exitstatus = EXIT_FAILURE;
684
goto end;
858
goto fallback;
685
859
}
686
// Starting a new process to be watched
860
/* Starting a new process to be watched */
687
861
pid_t pid = fork();
688
862
if(pid == -1){
689
863
perror("fork");
690
864
exitstatus = EXIT_FAILURE;
691
goto end;
865
goto fallback;
692
866
}
693
867
if(pid == 0){
694
868
/* this is the child process */
697
871
perror("sigaction");
698
872
_exit(EXIT_FAILURE);
699
873
}
700
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
701
875
if(ret < 0){
702
876
perror("sigprocmask");
703
877
_exit(EXIT_FAILURE);
704
878
}
705
879
706
880
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
707
881
if(ret == -1){
708
882
perror("dup2");
727
901
}
728
902
/* no return */
729
903
}
730
/* parent process */
904
/* Parent process */
905
close(pipefd[1]); /* Close unused write end of pipe */
731
906
free(filename);
732
close(pipefd[1]); /* close unused write end of pipe */
733
process *new_process = malloc(sizeof(process));
734
if (new_process == NULL){
735
perror("malloc");
736
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);
737
911
if(ret < 0){
738
perror("sigprocmask");
912
perror("sigprocmask");
739
913
}
740
914
exitstatus = EXIT_FAILURE;
741
goto end;
915
goto fallback;
742
916
}
743
917
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
918
new_plugin->pid = pid;
919
new_plugin->fd = pipefd[0];
920
749
921
/* Unblock SIGCHLD so signal handler can be run if this process
750
922
has already completed */
751
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
752
924
if(ret < 0){
753
925
perror("sigprocmask");
754
926
exitstatus = EXIT_FAILURE;
755
goto end;
756
}
757
758
FD_SET(new_process->fd, &rfds_all);
759
760
if (maxfd < new_process->fd){
761
maxfd = new_process->fd;
762
}
763
764
}
765
766
/* Free the plugin list */
767
for(plugin *next; plugin_list != NULL; plugin_list = next){
768
next = plugin_list->next;
769
free(plugin_list->argv);
770
if(plugin_list->environ[0] != NULL){
771
for(char **e = plugin_list->environ; *e != NULL; e++){
772
free(*e);
773
}
774
}
775
free(plugin_list);
927
goto fallback;
928
}
929
930
FD_SET(new_plugin->fd, &rfds_all);
931
932
if(maxfd < new_plugin->fd){
933
maxfd = new_plugin->fd;
934
}
776
935
}
777
936
778
937
closedir(dir);
779
938
dir = NULL;
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = NULL;
939
free_plugin(getplugin(NULL));
940
941
for(plugin *p = plugin_list; p != NULL; p = p->next){
942
if(p->pid != 0){
943
break;
944
}
945
if(p->next == NULL){
946
fprintf(stderr, "No plugin processes started. Incorrect plugin"
947
" directory?\n");
948
free_plugin_list();
949
}
785
950
}
786
while(process_list){
951
952
/* Main loop while running plugins exist */
953
while(plugin_list){
787
954
fd_set rfds = rfds_all;
788
955
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
789
if (select_ret == -1){
956
if(select_ret == -1){
790
957
perror("select");
791
958
exitstatus = EXIT_FAILURE;
792
goto end;
959
goto fallback;
793
960
}
794
961
/* OK, now either a process completed, or something can be read
795
962
from one of them */
796
for(process *proc = process_list; proc ; proc = proc->next){
963
for(plugin *proc = plugin_list; proc != NULL;){
797
964
/* Is this process completely done? */
798
if(proc->eof and proc->completed){
965
if(proc->completed and proc->eof){
799
966
/* Only accept the plugin output if it exited cleanly */
800
967
if(not WIFEXITED(proc->status)
801
968
or WEXITSTATUS(proc->status) != 0){
802
969
/* Bad exit by plugin */
970
803
971
if(debug){
804
972
if(WIFEXITED(proc->status)){
805
fprintf(stderr, "Plugin %u exited with status %d\n",
806
(unsigned int) (proc->pid),
973
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
974
" %d\n", (intmax_t) (proc->pid),
807
975
WEXITSTATUS(proc->status));
808
} else if(WIFSIGNALED(proc->status)) {
809
fprintf(stderr, "Plugin %u killed by signal %d\n",
810
(unsigned int) (proc->pid),
976
} else if(WIFSIGNALED(proc->status)){
977
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
978
" %d\n", (intmax_t) (proc->pid),
811
979
WTERMSIG(proc->status));
812
980
} else if(WCOREDUMP(proc->status)){
813
fprintf(stderr, "Plugin %d dumped core\n",
814
(unsigned int) (proc->pid));
981
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
982
(intmax_t) (proc->pid));
815
983
}
816
984
}
985
817
986
/* Remove the plugin */
818
987
FD_CLR(proc->fd, &rfds_all);
988
819
989
/* Block signal while modifying process_list */
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
990
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
821
991
if(ret < 0){
822
992
perror("sigprocmask");
823
993
exitstatus = EXIT_FAILURE;
824
goto end;
825
}
826
/* Delete this process entry from the list */
827
if(process_list == proc){
828
/* First one - simple */
829
process_list = proc->next;
830
} else {
831
/* Second one or later */
832
for(process *p = process_list; p != NULL; p = p->next){
833
if(p->next == proc){
834
p->next = proc->next;
835
break;
836
}
837
}
838
}
994
goto fallback;
995
}
996
997
plugin *next_plugin = proc->next;
998
free_plugin(proc);
999
proc = next_plugin;
1000
839
1001
/* We are done modifying process list, so unblock signal */
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
841
NULL);
1002
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1003
NULL);
842
1004
if(ret < 0){
843
1005
perror("sigprocmask");
844
}
845
free(proc->buffer);
846
free(proc);
847
/* We deleted this process from the list, so we can't go
848
proc->next. Therefore, start over from the beginning of
849
the process list */
850
break;
1006
exitstatus = EXIT_FAILURE;
1007
goto fallback;
1008
}
1009
1010
if(plugin_list == NULL){
1011
break;
1012
}
1013
1014
continue;
851
1015
}
1016
852
1017
/* This process exited nicely, so print its buffer */
853
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1018
1019
bool bret = print_out_password(proc->buffer,
1020
proc->buffer_length);
855
1021
if(not bret){
856
1022
perror("print_out_password");
857
1023
exitstatus = EXIT_FAILURE;
858
1024
}
859
goto end;
1025
goto fallback;
860
1026
}
1027
861
1028
/* This process has not completed. Does it have any output? */
862
1029
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
863
1030
/* This process had nothing to say at this time */
1031
proc = proc->next;
864
1032
continue;
865
1033
}
866
1034
/* Before reading, make the process' data buffer large enough */
867
1035
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
868
1036
proc->buffer = realloc(proc->buffer, proc->buffer_size
869
1037
+ (size_t) BUFFER_SIZE);
870
if (proc->buffer == NULL){
1038
if(proc->buffer == NULL){
871
1039
perror("malloc");
872
1040
exitstatus = EXIT_FAILURE;
873
goto end;
1041
goto fallback;
874
1042
}
875
1043
proc->buffer_size += BUFFER_SIZE;
876
1044
}
877
1045
/* Read from the process */
878
ret = read(proc->fd, proc->buffer + proc->buffer_length,
879
BUFFER_SIZE);
880
if(ret < 0){
1046
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1047
BUFFER_SIZE);
1048
if(sret < 0){
881
1049
/* Read error from this process; ignore the error */
1050
proc = proc->next;
882
1051
continue;
883
1052
}
884
if(ret == 0){
1053
if(sret == 0){
885
1054
/* got EOF */
886
1055
proc->eof = true;
887
1056
} else {
888
proc->buffer_length += (size_t) ret;
1057
proc->buffer_length += (size_t) sret;
889
1058
}
890
1059
}
891
1060
}
892
1061
893
1062
894
end:
1063
fallback:
895
1064
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1065
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1066
/* Fallback if all plugins failed, none are found or an error
1067
occured */
898
1068
bool bret;
899
1069
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
900
1070
char *passwordbuffer = getpass("Password: ");
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1071
size_t len = strlen(passwordbuffer);
1072
/* Strip trailing newline */
1073
if(len > 0 and passwordbuffer[len-1] == '\n'){
1074
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1075
len--;
1076
}
1077
bret = print_out_password(passwordbuffer, len);
902
1078
if(not bret){
903
1079
perror("print_out_password");
904
1080
exitstatus = EXIT_FAILURE;
905
goto end;
906
1081
}
907
1082
}
908
1083
909
1084
/* Restore old signal handler */
910
sigaction(SIGCHLD, &old_sigchld_action, NULL);
911
912
free(custom_argv);
913
914
/* Free the plugin list */
915
for(plugin *next; plugin_list != NULL; plugin_list = next){
916
next = plugin_list->next;
917
free(plugin_list->argv);
918
if(plugin_list->environ[0] != NULL){
919
for(char **e = plugin_list->environ; *e != NULL; e++){
920
free(*e);
921
}
1085
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1086
if(ret == -1){
1087
perror("sigaction");
1088
exitstatus = EXIT_FAILURE;
1089
}
1090
1091
if(custom_argv != NULL){
1092
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1093
free(*arg);
922
1094
}
923
free(plugin_list->environ);
924
free(plugin_list);
1095
free(custom_argv);
925
1096
}
926
1097
927
1098
if(dir != NULL){
928
1099
closedir(dir);
929
1100
}
930
1101
931
/* Free the process list and kill the processes */
932
for(process *next; process_list != NULL; process_list = next){
933
next = process_list->next;
934
close(process_list->fd);
935
ret = kill(process_list->pid, SIGTERM);
936
if(ret == -1 and errno != ESRCH){
937
/* set-uid proccesses migth not get closed */
938
perror("kill");
1102
/* Kill the processes */
1103
for(plugin *p = plugin_list; p != NULL; p = p->next){
1104
if(p->pid != 0){
1105
close(p->fd);
1106
ret = kill(p->pid, SIGTERM);
1107
if(ret == -1 and errno != ESRCH){
1108
/* Set-uid proccesses might not get closed */
1109
perror("kill");
1110
}
939
1111
}
940
free(process_list->buffer);
941
free(process_list);
942
1112
}
943
1113
944
1114
/* Wait for any remaining child processes to terminate */
949
1119
perror("wait");
950
1120
}
951
1121
1122
free_plugin_list();
1123
1124
free(plugindir);
1125
free(argfile);
1126
952
1127
return exitstatus;
953
1128
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0