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- Committer: Teddy Hogeborn
- Date: 2008-09-01 16:53:17 UTC
- Revision ID: teddy@fukt.bsnet.se-20080901165317-77dccp81zyqimt2j
* plugin-runner.c (add_environment): Override existing environment
variables when asked to do so.
All callers changed.
(main): Removed old argp.args_doc string. Parse argument file
before normal command line arguments. Use ARGP_IN_ORDER
flag in both calls to argp_parse. Do not strdup() strings
to be sent to add_environment().
* plugin-runner.xml (OPTIONS): Document "--global-env" and "--envs-for".
(FILES): Note that the config file is parsed before the command line
options.
variables when asked to do so.
All callers changed.
(main): Removed old argp.args_doc string. Parse argument file
before normal command line arguments. Use ARGP_IN_ORDER
flag in both calls to argp_parse. Do not strdup() strings
to be sent to add_environment().
* plugin-runner.xml (OPTIONS): Document "--global-env" and "--envs-for".
(FILES): Note that the config file is parsed before the command line
options.
- files added:
- .bzrignore
- files removed:
- network-protocol.txt
- files modified:
- Makefile
added
removed
plugin-runner.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
26
#include <stddef.h> /* size_t, NULL */
27
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
28
EXIT_SUCCESS, realloc() */
51
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
53
FD_CLOEXEC */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
55
#include <errno.h> /* errno */
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, error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
62
sigaddset(), sigaction(),
63
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
66
67
67
#define BUFFER_SIZE 256
68
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
69
72
const char *argp_program_version = "plugin-runner 1.0";
70
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
74
72
struct process;
73
74
typedef struct process{
75
struct plugin;
76
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;
84
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;
82
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
bool disabled;
92
volatile bool completed;
93
volatile int status;
91
94
struct plugin *next;
92
95
} plugin;
93
96
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
static plugin *plugin_list = NULL;
98
99
/* Gets a 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){
96
104
if ((p->name == name)
97
105
or (p->name and name and (strcmp(p->name, name) == 0))){
98
106
return p;
101
109
/* Create a new plugin */
102
110
plugin *new_plugin = malloc(sizeof(plugin));
103
111
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
112
return NULL;
113
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
120
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
108
127
new_plugin->argv = malloc(sizeof(char *) * 2);
109
128
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
112
132
}
113
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
114
134
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
135
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
138
free(copy_name);
139
free(new_plugin->argv);
140
free(new_plugin);
141
return NULL;
142
}
143
new_plugin->environ[0] = NULL;
144
118
145
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
120
147
return new_plugin;
121
148
}
122
149
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
152
int *len){
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
156
/* Malloc check */
157
if(*array == NULL){
158
return false;
159
}
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
162
if(copy == NULL){
163
return false;
164
}
165
/* Insert the copy */
166
(*array)[*len] = copy;
167
(*len)++;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
170
return true;
171
}
172
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
175
if(p == NULL){
176
return false;
177
}
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
179
}
180
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
183
if(p == NULL){
184
return false;
185
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
return add_to_char_array(def, &(p->environ), &(p->envc));
132
204
}
133
205
134
206
/*
147
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
220
}
149
221
150
process *process_list = NULL;
151
222
152
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
153
224
status. */
154
225
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
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
}
171
253
}
172
254
255
/* Prints out a password to stdout */
173
256
bool print_out_password(const char *buffer, size_t length){
174
257
ssize_t ret;
175
258
if(length>0 and buffer[length-1] == '\n'){
185
268
return true;
186
269
}
187
270
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
295
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
305
}
306
188
307
int main(int argc, char *argv[]){
189
const char *plugindir = "/lib/mandos/plugins.d";
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
190
311
size_t d_name_len;
191
312
DIR *dir = NULL;
192
313
struct dirent *dirst;
200
321
struct sigaction old_sigchld_action;
201
322
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
323
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
324
char **custom_argv = NULL;
325
int custom_argc = 0;
326
206
327
/* Establish a signal handler */
207
328
sigemptyset(&sigchld_action.sa_mask);
208
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
209
if(ret < 0){
330
if(ret == -1){
210
331
perror("sigaddset");
211
exit(EXIT_FAILURE);
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
212
334
}
213
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
214
if(ret < 0){
336
if(ret == -1){
215
337
perror("sigaction");
216
exit(EXIT_FAILURE);
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
217
340
}
218
341
219
342
/* The options we understand. */
221
344
{ .name = "global-options", .key = 'g',
222
345
.arg = "OPTION[,OPTION[,...]]",
223
346
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'e',
348
.arg = "VAR=value",
349
.doc = "Environment variable passed to all plugins" },
224
350
{ .name = "options-for", .key = 'o',
225
351
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
352
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'f',
354
.arg = "PLUGIN:ENV=value",
355
.doc = "Environment variable passed to specified plugin" },
227
356
{ .name = "disable", .key = 'd',
228
357
.arg = "PLUGIN",
229
358
.doc = "Disable a specific plugin", .group = 1 },
230
359
{ .name = "plugin-dir", .key = 128,
231
360
.arg = "DIRECTORY",
232
361
.doc = "Specify a different plugin directory", .group = 2 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
362
{ .name = "config-file", .key = 129,
363
.arg = "FILE",
364
.doc = "Specify a different configuration file", .group = 2 },
365
{ .name = "userid", .key = 130,
366
.arg = "ID", .flags = 0,
367
.doc = "User ID the plugins will run as", .group = 3 },
368
{ .name = "groupid", .key = 131,
369
.arg = "ID", .flags = 0,
370
.doc = "Group ID the plugins will run as", .group = 3 },
371
{ .name = "debug", .key = 132,
372
.doc = "Debug mode", .group = 4 },
241
373
{ .name = NULL }
242
374
};
243
375
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
245
378
/* Get the INPUT argument from `argp_parse', which we know is a
246
379
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
248
380
switch (key) {
249
case 'g':
250
if (arg != NULL){
251
char *p = strtok(arg, ",");
252
do{
253
addargument(getplugin(NULL, plugins), p);
254
p = strtok(NULL, ",");
255
} while (p != NULL);
256
}
257
break;
258
case 'o':
259
if (arg != NULL){
260
char *name = strtok(arg, ":");
261
char *p = strtok(NULL, ":");
262
if(p != NULL){
263
p = strtok(p, ",");
264
do{
265
addargument(getplugin(name, plugins), p);
266
p = strtok(NULL, ",");
267
} while (p != NULL);
268
}
269
}
270
break;
271
case 'd':
272
if (arg != NULL){
273
getplugin(arg, plugins)->disabled = true;
274
}
275
break;
276
case 128:
277
plugindir = arg;
278
break;
279
case 129:
381
case 'g': /* --global-options */
382
if (arg != NULL){
383
char *p;
384
while((p = strsep(&arg, ",")) != NULL){
385
if(p[0] == '\0'){
386
continue;
387
}
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
391
}
392
}
393
}
394
break;
395
case 'e': /* --global-env */
396
if(arg == NULL){
397
break;
398
}
399
{
400
char *envdef = strdup(arg);
401
if(envdef == NULL){
402
break;
403
}
404
if(not add_environment(getplugin(NULL), envdef, true)){
405
perror("add_environment");
406
}
407
}
408
break;
409
case 'o': /* --options-for */
410
if (arg != NULL){
411
char *p_name = strsep(&arg, ":");
412
if(p_name[0] == '\0'){
413
break;
414
}
415
char *opt = strsep(&arg, ":");
416
if(opt[0] == '\0'){
417
break;
418
}
419
if(opt != NULL){
420
char *p;
421
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
423
continue;
424
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
428
}
429
}
430
}
431
}
432
break;
433
case 'f': /* --env-for */
434
if(arg == NULL){
435
break;
436
}
437
{
438
char *envdef = strchr(arg, ':');
439
if(envdef == NULL){
440
break;
441
}
442
char *p_name = strndup(arg, (size_t) (envdef-arg));
443
if(p_name == NULL){
444
break;
445
}
446
envdef++;
447
if(not add_environment(getplugin(p_name), envdef, true)){
448
perror("add_environment");
449
}
450
}
451
break;
452
case 'd': /* --disable */
453
if (arg != NULL){
454
plugin *p = getplugin(arg);
455
if(p == NULL){
456
return ARGP_ERR_UNKNOWN;
457
}
458
p->disabled = true;
459
}
460
break;
461
case 128: /* --plugin-dir */
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
466
break;
467
case 129: /* --config-file */
468
argfile = strdup(arg);
469
if(argfile == NULL){
470
perror("strdup");
471
}
472
break;
473
case 130: /* --userid */
280
474
uid = (uid_t)strtol(arg, NULL, 10);
281
475
break;
282
case 130:
476
case 131: /* --groupid */
283
477
gid = (gid_t)strtol(arg, NULL, 10);
284
478
break;
285
case 131:
479
case 132: /* --debug */
286
480
debug = true;
287
481
break;
288
482
case ARGP_KEY_ARG:
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
291
}
292
plus_options = arg;
483
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
293
484
break;
294
485
case ARGP_KEY_END:
295
486
break;
299
490
return 0;
300
491
}
301
492
302
plugin *plugin_list = NULL;
303
304
493
struct argp argp = { .options = options, .parser = parse_opt,
305
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
494
.args_doc = "",
306
495
.doc = "Mandos plugin runner -- Run plugins" };
307
496
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
497
/* Open the configfile if available */
498
if (argfile == NULL){
499
conffp = fopen(AFILE, "r");
500
} else {
501
conffp = fopen(argfile, "r");
502
}
503
if(conffp != NULL){
504
char *org_line = NULL;
505
char *p, *arg, *new_arg, *line;
506
size_t size = 0;
507
ssize_t sret;
508
const char whitespace_delims[] = " \r\t\f\v\n";
509
const char comment_delim[] = "#";
510
511
custom_argc = 1;
512
custom_argv = malloc(sizeof(char*) * 2);
513
if(custom_argv == NULL){
514
perror("malloc");
515
exitstatus = EXIT_FAILURE;
516
goto fallback;
517
}
518
custom_argv[0] = argv[0];
519
custom_argv[1] = NULL;
520
521
/* for each line in the config file, strip whitespace and ignore
522
commented text */
523
while(true){
524
sret = getline(&org_line, &size, conffp);
525
if(sret == -1){
526
break;
527
}
528
529
line = org_line;
530
arg = strsep(&line, comment_delim);
531
while((p = strsep(&arg, whitespace_delims)) != NULL){
532
if(p[0] == '\0'){
533
continue;
534
}
535
new_arg = strdup(p);
536
if(new_arg == NULL){
537
perror("strdup");
538
exitstatus = EXIT_FAILURE;
539
free(org_line);
540
goto fallback;
541
}
542
543
custom_argc += 1;
544
custom_argv = realloc(custom_argv, sizeof(char *)
545
* ((unsigned int) custom_argc + 1));
546
if(custom_argv == NULL){
547
perror("realloc");
548
exitstatus = EXIT_FAILURE;
549
free(org_line);
550
goto fallback;
551
}
552
custom_argv[custom_argc-1] = new_arg;
553
custom_argv[custom_argc] = NULL;
554
}
555
}
556
free(org_line);
557
} else {
558
/* Check for harmful errors and go to fallback. Other errors might
559
not affect opening plugins */
560
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
561
perror("fopen");
562
exitstatus = EXIT_FAILURE;
563
goto fallback;
564
}
565
}
566
/* If there was any arguments from configuration file,
567
pass them to parser as command arguments */
568
if(custom_argv != NULL){
569
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
570
0, NULL);
571
if (ret == ARGP_ERR_UNKNOWN){
572
fprintf(stderr, "Unknown error while parsing arguments\n");
573
exitstatus = EXIT_FAILURE;
574
goto fallback;
575
}
576
}
577
578
/* Parse actual command line arguments, to let them override the
579
config file */
580
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
309
581
if (ret == ARGP_ERR_UNKNOWN){
310
582
fprintf(stderr, "Unknown error while parsing arguments\n");
311
583
exitstatus = EXIT_FAILURE;
312
goto end;
313
}
314
315
if(plus_options){
316
/* This is a mangled argument in the form of
317
"+--option+--other-option=parameter+--yet-another-option", etc */
318
/* Make new argc and argv vars, and call argp_parse() again. */
319
plus_options++; /* skip the first '+' character */
320
const char delims[] = "+";
321
char *arg;
322
int new_argc = 1;
323
plus_argv = malloc(sizeof(char*) * 2);
324
if(plus_argv == NULL){
325
perror("malloc");
326
exitstatus = EXIT_FAILURE;
327
goto end;
328
}
329
plus_argv[0] = argv[0];
330
plus_argv[1] = NULL;
331
arg = strtok(plus_options, delims); /* Get first argument */
332
while(arg != NULL){
333
new_argc++;
334
plus_argv = realloc(plus_argv, sizeof(char *)
335
* ((unsigned int) new_argc + 1));
336
if(plus_argv == NULL){
337
perror("realloc");
338
exitstatus = EXIT_FAILURE;
339
goto end;
340
}
341
plus_argv[new_argc-1] = arg;
342
plus_argv[new_argc] = NULL;
343
arg = strtok(NULL, delims); /* Get next argument */
344
}
345
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
346
if (ret == ARGP_ERR_UNKNOWN){
347
fprintf(stderr, "Unknown error while parsing arguments\n");
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
584
goto fallback;
351
585
}
352
586
353
587
if(debug){
357
591
for(char **a = p->argv; *a != NULL; a++){
358
592
fprintf(stderr, "\tArg: %s\n", *a);
359
593
}
594
fprintf(stderr, "...and %u environment variables\n", p->envc);
595
for(char **a = p->environ; *a != NULL; a++){
596
fprintf(stderr, "\t%s\n", *a);
597
}
360
598
}
361
599
}
362
600
601
/* Strip permissions down to nobody */
363
602
ret = setuid(uid);
364
603
if (ret == -1){
365
604
perror("setuid");
366
}
367
605
}
368
606
setgid(gid);
369
607
if (ret == -1){
370
608
perror("setgid");
371
609
}
372
610
373
dir = opendir(plugindir);
611
if (plugindir == NULL){
612
dir = opendir(PDIR);
613
} else {
614
dir = opendir(plugindir);
615
}
616
374
617
if(dir == NULL){
375
618
perror("Could not open plugin dir");
376
619
exitstatus = EXIT_FAILURE;
377
goto end;
620
goto fallback;
378
621
}
379
622
380
623
/* Set the FD_CLOEXEC flag on the directory, if possible */
385
628
if(ret < 0){
386
629
perror("set_cloexec_flag");
387
630
exitstatus = EXIT_FAILURE;
388
goto end;
631
goto fallback;
389
632
}
390
633
}
391
634
}
392
635
393
636
FD_ZERO(&rfds_all);
394
637
638
/* Read and execute any executable in the plugin directory*/
395
639
while(true){
396
640
dirst = readdir(dir);
397
641
398
// All directory entries have been processed
642
/* All directory entries have been processed */
399
643
if(dirst == NULL){
400
644
if (errno == EBADF){
401
645
perror("readdir");
402
646
exitstatus = EXIT_FAILURE;
403
goto end;
647
goto fallback;
404
648
}
405
649
break;
406
650
}
407
651
408
652
d_name_len = strlen(dirst->d_name);
409
653
410
// Ignore dotfiles, backup files and other junk
654
/* Ignore dotfiles, backup files and other junk */
411
655
{
412
656
bool bad_name = false;
413
657
428
672
break;
429
673
}
430
674
}
431
432
675
if(bad_name){
433
676
continue;
434
677
}
435
436
678
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
437
679
size_t suf_len = strlen(*suf);
438
680
if((d_name_len >= suf_len)
451
693
continue;
452
694
}
453
695
}
454
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
696
697
char *filename;
698
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
699
if(ret < 0){
700
perror("asprintf");
458
701
continue;
459
702
}
460
strcpy(filename, plugindir); /* Spurious warning */
461
strcat(filename, "/"); /* Spurious warning */
462
strcat(filename, dirst->d_name); /* Spurious warning */
463
703
464
704
ret = stat(filename, &st);
465
705
if (ret == -1){
467
707
free(filename);
468
708
continue;
469
709
}
470
710
711
/* Ignore non-executable files */
471
712
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
472
713
if(debug){
473
714
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
476
717
free(filename);
477
718
continue;
478
719
}
479
if(getplugin(dirst->d_name, &plugin_list)->disabled){
720
721
plugin *p = getplugin(dirst->d_name);
722
if(p == NULL){
723
perror("getplugin");
724
free(filename);
725
continue;
726
}
727
if(p->disabled){
480
728
if(debug){
481
729
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
482
730
dirst->d_name);
484
732
free(filename);
485
733
continue;
486
734
}
487
plugin *p = getplugin(dirst->d_name, &plugin_list);
488
735
{
489
736
/* Add global arguments to argument list for this plugin */
490
plugin *g = getplugin(NULL, &plugin_list);
491
for(char **a = g->argv + 1; *a != NULL; a++){
492
addargument(p, *a);
493
}
494
}
495
int pipefd[2];
737
plugin *g = getplugin(NULL);
738
if(g != NULL){
739
for(char **a = g->argv + 1; *a != NULL; a++){
740
if(not add_argument(p, *a)){
741
perror("add_argument");
742
}
743
}
744
/* Add global environment variables */
745
for(char **e = g->environ; *e != NULL; e++){
746
if(not add_environment(p, *e, false)){
747
perror("add_environment");
748
}
749
}
750
}
751
}
752
/* If this plugin has any environment variables, we will call
753
using execve and need to duplicate the environment from this
754
process, too. */
755
if(p->environ[0] != NULL){
756
for(char **e = environ; *e != NULL; e++){
757
if(not add_environment(p, *e, false)){
758
perror("add_environment");
759
}
760
}
761
}
762
763
int pipefd[2];
496
764
ret = pipe(pipefd);
497
765
if (ret == -1){
498
766
perror("pipe");
499
767
exitstatus = EXIT_FAILURE;
500
goto end;
768
goto fallback;
501
769
}
770
/* Ask OS to automatic close the pipe on exec */
502
771
ret = set_cloexec_flag(pipefd[0]);
503
772
if(ret < 0){
504
773
perror("set_cloexec_flag");
505
774
exitstatus = EXIT_FAILURE;
506
goto end;
775
goto fallback;
507
776
}
508
777
ret = set_cloexec_flag(pipefd[1]);
509
778
if(ret < 0){
510
779
perror("set_cloexec_flag");
511
780
exitstatus = EXIT_FAILURE;
512
goto end;
781
goto fallback;
513
782
}
514
783
/* Block SIGCHLD until process is safely in process list */
515
784
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
516
785
if(ret < 0){
517
786
perror("sigprocmask");
518
787
exitstatus = EXIT_FAILURE;
519
goto end;
788
goto fallback;
520
789
}
521
// Starting a new process to be watched
790
/* Starting a new process to be watched */
522
791
pid_t pid = fork();
523
792
if(pid == -1){
524
793
perror("fork");
525
794
exitstatus = EXIT_FAILURE;
526
goto end;
795
goto fallback;
527
796
}
528
797
if(pid == 0){
529
798
/* this is the child process */
549
818
above and must now close it manually here. */
550
819
closedir(dir);
551
820
}
552
if(execv(filename, p->argv) < 0){
553
perror("execv");
554
_exit(EXIT_FAILURE);
821
if(p->environ[0] == NULL){
822
if(execv(filename, p->argv) < 0){
823
perror("execv");
824
_exit(EXIT_FAILURE);
825
}
826
} else {
827
if(execve(filename, p->argv, p->environ) < 0){
828
perror("execve");
829
_exit(EXIT_FAILURE);
830
}
555
831
}
556
832
/* no return */
557
833
}
558
/* parent process */
834
/* Parent process */
835
close(pipefd[1]); /* Close unused write end of pipe */
559
836
free(filename);
560
close(pipefd[1]); /* close unused write end of pipe */
561
process *new_process = malloc(sizeof(process));
562
if (new_process == NULL){
563
perror("malloc");
837
plugin *new_plugin = getplugin(dirst->d_name);
838
if (new_plugin == NULL){
839
perror("getplugin");
564
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
565
841
if(ret < 0){
566
perror("sigprocmask");
842
perror("sigprocmask");
567
843
}
568
844
exitstatus = EXIT_FAILURE;
569
goto end;
845
goto fallback;
570
846
}
571
847
572
*new_process = (struct process){ .pid = pid,
573
.fd = pipefd[0],
574
.next = process_list };
575
// List handling
576
process_list = new_process;
848
new_plugin->pid = pid;
849
new_plugin->fd = pipefd[0];
850
577
851
/* Unblock SIGCHLD so signal handler can be run if this process
578
852
has already completed */
579
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
580
854
if(ret < 0){
581
855
perror("sigprocmask");
582
856
exitstatus = EXIT_FAILURE;
583
goto end;
584
}
585
586
FD_SET(new_process->fd, &rfds_all);
587
588
if (maxfd < new_process->fd){
589
maxfd = new_process->fd;
590
}
591
592
}
593
594
/* Free the plugin list */
595
for(plugin *next; plugin_list != NULL; plugin_list = next){
596
next = plugin_list->next;
597
free(plugin_list->argv);
598
free(plugin_list);
857
goto fallback;
858
}
859
860
FD_SET(new_plugin->fd, &rfds_all);
861
862
if (maxfd < new_plugin->fd){
863
maxfd = new_plugin->fd;
864
}
865
599
866
}
600
867
601
868
closedir(dir);
602
869
dir = NULL;
603
604
if (process_list == NULL){
605
fprintf(stderr, "No plugin processes started. Incorrect plugin"
606
" directory?\n");
607
process_list = NULL;
870
871
for(plugin *p = plugin_list; p != NULL; p = p->next){
872
if(p->pid != 0){
873
break;
874
}
875
if(p->next == NULL){
876
fprintf(stderr, "No plugin processes started. Incorrect plugin"
877
" directory?\n");
878
free_plugin_list();
879
}
608
880
}
609
while(process_list){
881
882
/* Main loop while running plugins exist */
883
while(plugin_list){
610
884
fd_set rfds = rfds_all;
611
885
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
612
886
if (select_ret == -1){
613
887
perror("select");
614
888
exitstatus = EXIT_FAILURE;
615
goto end;
889
goto fallback;
616
890
}
617
891
/* OK, now either a process completed, or something can be read
618
892
from one of them */
619
for(process *proc = process_list; proc ; proc = proc->next){
893
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
620
894
/* Is this process completely done? */
621
895
if(proc->eof and proc->completed){
622
896
/* Only accept the plugin output if it exited cleanly */
623
897
if(not WIFEXITED(proc->status)
624
898
or WEXITSTATUS(proc->status) != 0){
625
899
/* Bad exit by plugin */
900
626
901
if(debug){
627
902
if(WIFEXITED(proc->status)){
628
903
fprintf(stderr, "Plugin %u exited with status %d\n",
637
912
(unsigned int) (proc->pid));
638
913
}
639
914
}
915
640
916
/* Remove the plugin */
641
917
FD_CLR(proc->fd, &rfds_all);
918
642
919
/* Block signal while modifying process_list */
643
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
920
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
644
921
if(ret < 0){
645
922
perror("sigprocmask");
646
923
exitstatus = EXIT_FAILURE;
647
goto end;
648
}
649
/* Delete this process entry from the list */
650
if(process_list == proc){
651
/* First one - simple */
652
process_list = proc->next;
653
} else {
654
/* Second one or later */
655
for(process *p = process_list; p != NULL; p = p->next){
656
if(p->next == proc){
657
p->next = proc->next;
658
break;
659
}
660
}
661
}
924
goto fallback;
925
}
926
free_plugin(proc);
662
927
/* We are done modifying process list, so unblock signal */
663
928
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
664
929
NULL);
665
930
if(ret < 0){
666
931
perror("sigprocmask");
667
}
668
free(proc->buffer);
669
free(proc);
670
/* We deleted this process from the list, so we can't go
671
proc->next. Therefore, start over from the beginning of
672
the process list */
673
break;
932
exitstatus = EXIT_FAILURE;
933
goto fallback;
934
}
935
936
if(plugin_list == NULL){
937
break;
938
}
939
continue;
674
940
}
941
675
942
/* This process exited nicely, so print its buffer */
676
943
677
bool bret = print_out_password(proc->buffer, proc->buffer_length);
944
bool bret = print_out_password(proc->buffer,
945
proc->buffer_length);
678
946
if(not bret){
679
947
perror("print_out_password");
680
948
exitstatus = EXIT_FAILURE;
681
949
}
682
goto end;
950
goto fallback;
683
951
}
952
684
953
/* This process has not completed. Does it have any output? */
685
954
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
686
955
/* This process had nothing to say at this time */
693
962
if (proc->buffer == NULL){
694
963
perror("malloc");
695
964
exitstatus = EXIT_FAILURE;
696
goto end;
965
goto fallback;
697
966
}
698
967
proc->buffer_size += BUFFER_SIZE;
699
968
}
714
983
}
715
984
716
985
717
end:
986
fallback:
718
987
719
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
720
/* Fallback if all plugins failed, none are found or an error occured */
988
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
989
/* Fallback if all plugins failed, none are found or an error
990
occured */
721
991
bool bret;
722
992
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
723
993
char *passwordbuffer = getpass("Password: ");
725
995
if(not bret){
726
996
perror("print_out_password");
727
997
exitstatus = EXIT_FAILURE;
728
goto end;
729
998
}
730
999
}
731
1000
732
1001
/* Restore old signal handler */
733
sigaction(SIGCHLD, &old_sigchld_action, NULL);
734
735
free(plus_argv);
736
737
/* Free the plugin list */
738
for(plugin *next; plugin_list != NULL; plugin_list = next){
739
next = plugin_list->next;
740
free(plugin_list->argv);
741
free(plugin_list);
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1003
if(ret == -1){
1004
perror("sigaction");
1005
exitstatus = EXIT_FAILURE;
1006
}
1007
1008
if(custom_argv != NULL){
1009
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1010
free(*arg);
1011
}
1012
free(custom_argv);
742
1013
}
743
1014
744
1015
if(dir != NULL){
746
1017
}
747
1018
748
1019
/* Free the process list and kill the processes */
749
for(process *next; process_list != NULL; process_list = next){
750
next = process_list->next;
751
close(process_list->fd);
752
ret = kill(process_list->pid, SIGTERM);
753
if(ret == -1 and errno != ESRCH){
754
/* set-uid proccesses migth not get closed */
755
perror("kill");
1020
for(plugin *p = plugin_list; p != NULL; p = p->next){
1021
if(p->pid != 0){
1022
close(p->fd);
1023
ret = kill(p->pid, SIGTERM);
1024
if(ret == -1 and errno != ESRCH){
1025
/* Set-uid proccesses might not get closed */
1026
perror("kill");
1027
}
756
1028
}
757
free(process_list->buffer);
758
free(process_list);
759
1029
}
760
1030
761
1031
/* Wait for any remaining child processes to terminate */
765
1035
if(errno != ECHILD){
766
1036
perror("wait");
767
1037
}
1038
1039
free_plugin_list();
1040
1041
free(plugindir);
1042
free(argfile);
768
1043
769
1044
return exitstatus;
770
1045
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0