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- Committer: Teddy Hogeborn
- Date: 2008-09-01 16:19:32 UTC
- Revision ID: teddy@fukt.bsnet.se-20080901161932-ostp7tulh9aijulh
* plugin-runner.c (add_environment): Never insert existing environment
variables.
(main): Rename "--global-envs" to "--global-env" and "--envs-for" to
"--env-for".
* plugin-runner.xml (SYNOPSIS): Rename "--global-envs" to
"--global-env" and "--envs-for" to
"--env-for".
(OPTIONS): Added "--global-env" and "--env-for".
(FALLBACK): Add id attribute.
(EXIT STATUS): Add text.
(ENVIRONMENT): New section.
(FILES): Document configuration file.
variables.
(main): Rename "--global-envs" to "--global-env" and "--envs-for" to
"--env-for".
* plugin-runner.xml (SYNOPSIS): Rename "--global-envs" to
"--global-env" and "--envs-for" to
"--env-for".
(OPTIONS): Added "--global-env" and "--env-for".
(FALLBACK): Add id attribute.
(EXIT STATUS): Add text.
(ENVIRONMENT): New section.
(FILES): Document configuration file.
- files added:
- .bzrignore
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- 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
const char *argp_program_version = "mandos-client 1.0";
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
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){
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
/* Refuse to add an existing variable */
192
return true;
193
}
194
}
195
return add_to_char_array(def, &(p->environ), &(p->envc));
132
196
}
133
197
134
198
/*
147
211
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
212
}
149
213
150
process *process_list = NULL;
151
214
152
/* Mark a process as completed when it exits, and save its exit
215
/* Mark processes as completed when they exit, and save their exit
153
216
status. */
154
217
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;
218
while(true){
219
plugin *proc = plugin_list;
220
int status;
221
pid_t pid = waitpid(-1, &status, WNOHANG);
222
if(pid == 0){
223
/* Only still running child processes */
224
break;
225
}
226
if(pid == -1){
227
if (errno != ECHILD){
228
perror("waitpid");
229
}
230
/* No child processes */
231
break;
232
}
233
234
/* A child exited, find it in process_list */
235
while(proc != NULL and proc->pid != pid){
236
proc = proc->next;
237
}
238
if(proc == NULL){
239
/* Process not found in process list */
240
continue;
241
}
242
proc->status = status;
243
proc->completed = true;
244
}
171
245
}
172
246
247
/* Prints out a password to stdout */
173
248
bool print_out_password(const char *buffer, size_t length){
174
249
ssize_t ret;
175
250
if(length>0 and buffer[length-1] == '\n'){
185
260
return true;
186
261
}
187
262
263
/* Removes and free a plugin from the plugin list */
264
static void free_plugin(plugin *plugin_node){
265
266
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
267
free(*arg);
268
}
269
free(plugin_node->argv);
270
for(char **env = plugin_node->environ; *env != NULL; env++){
271
free(*env);
272
}
273
free(plugin_node->environ);
274
free(plugin_node->buffer);
275
276
/* Removes the plugin from the singly-linked list */
277
if(plugin_node == plugin_list){
278
/* First one - simple */
279
plugin_list = plugin_list->next;
280
} else {
281
/* Second one or later */
282
for(plugin *p = plugin_list; p != NULL; p = p->next){
283
if(p->next == plugin_node){
284
p->next = plugin_node->next;
285
break;
286
}
287
}
288
}
289
290
free(plugin_node);
291
}
292
293
static void free_plugin_list(void){
294
while(plugin_list != NULL){
295
free_plugin(plugin_list);
296
}
297
}
298
188
299
int main(int argc, char *argv[]){
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
300
char *plugindir = NULL;
301
char *argfile = NULL;
302
FILE *conffp;
190
303
size_t d_name_len;
191
304
DIR *dir = NULL;
192
305
struct dirent *dirst;
200
313
struct sigaction old_sigchld_action;
201
314
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
315
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
316
char **custom_argv = NULL;
317
int custom_argc = 0;
318
206
319
/* Establish a signal handler */
207
320
sigemptyset(&sigchld_action.sa_mask);
208
321
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
209
if(ret < 0){
322
if(ret == -1){
210
323
perror("sigaddset");
211
exit(EXIT_FAILURE);
324
exitstatus = EXIT_FAILURE;
325
goto fallback;
212
326
}
213
327
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
214
if(ret < 0){
328
if(ret == -1){
215
329
perror("sigaction");
216
exit(EXIT_FAILURE);
330
exitstatus = EXIT_FAILURE;
331
goto fallback;
217
332
}
218
333
219
334
/* The options we understand. */
221
336
{ .name = "global-options", .key = 'g',
222
337
.arg = "OPTION[,OPTION[,...]]",
223
338
.doc = "Options passed to all plugins" },
339
{ .name = "global-env", .key = 'e',
340
.arg = "VAR=value",
341
.doc = "Environment variable passed to all plugins" },
224
342
{ .name = "options-for", .key = 'o',
225
343
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
344
.doc = "Options passed only to specified plugin" },
345
{ .name = "env-for", .key = 'f',
346
.arg = "PLUGIN:ENV=value",
347
.doc = "Environment variable passed to specified plugin" },
227
348
{ .name = "disable", .key = 'd',
228
349
.arg = "PLUGIN",
229
350
.doc = "Disable a specific plugin", .group = 1 },
230
351
{ .name = "plugin-dir", .key = 128,
231
352
.arg = "DIRECTORY",
232
353
.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 },
354
{ .name = "config-file", .key = 129,
355
.arg = "FILE",
356
.doc = "Specify a different configuration file", .group = 2 },
357
{ .name = "userid", .key = 130,
358
.arg = "ID", .flags = 0,
359
.doc = "User ID the plugins will run as", .group = 3 },
360
{ .name = "groupid", .key = 131,
361
.arg = "ID", .flags = 0,
362
.doc = "Group ID the plugins will run as", .group = 3 },
363
{ .name = "debug", .key = 132,
364
.doc = "Debug mode", .group = 4 },
241
365
{ .name = NULL }
242
366
};
243
367
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
368
error_t parse_opt (int key, char *arg, __attribute__((unused))
369
struct argp_state *state) {
245
370
/* Get the INPUT argument from `argp_parse', which we know is a
246
371
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
248
372
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:
373
case 'g': /* --global-options */
374
if (arg != NULL){
375
char *p;
376
while((p = strsep(&arg, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(NULL), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
384
}
385
}
386
break;
387
case 'e': /* --global-env */
388
if(arg == NULL){
389
break;
390
}
391
{
392
char *envdef = strdup(arg);
393
if(envdef == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), envdef)){
397
perror("add_environment");
398
}
399
}
400
break;
401
case 'o': /* --options-for */
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0'){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0'){
409
break;
410
}
411
if(opt != NULL){
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
421
}
422
}
423
}
424
break;
425
case 'f': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
429
{
430
char *envdef = strchr(arg, ':');
431
if(envdef == NULL){
432
break;
433
}
434
char *p_name = strndup(arg, (size_t) (envdef-arg));
435
if(p_name == NULL){
436
break;
437
}
438
envdef++;
439
if(not add_environment(getplugin(p_name), envdef)){
440
perror("add_environment");
441
}
442
}
443
break;
444
case 'd': /* --disable */
445
if (arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = true;
451
}
452
break;
453
case 128: /* --plugin-dir */
454
plugindir = strdup(arg);
455
if(plugindir == NULL){
456
perror("strdup");
457
}
458
break;
459
case 129: /* --config-file */
460
argfile = strdup(arg);
461
if(argfile == NULL){
462
perror("strdup");
463
}
464
break;
465
case 130: /* --userid */
280
466
uid = (uid_t)strtol(arg, NULL, 10);
281
467
break;
282
case 130:
468
case 131: /* --groupid */
283
469
gid = (gid_t)strtol(arg, NULL, 10);
284
470
break;
285
case 131:
471
case 132: /* --debug */
286
472
debug = true;
287
473
break;
288
474
case ARGP_KEY_ARG:
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
291
}
292
plus_options = arg;
475
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
293
476
break;
294
477
case ARGP_KEY_END:
295
478
break;
299
482
return 0;
300
483
}
301
484
302
plugin *plugin_list = NULL;
303
304
485
struct argp argp = { .options = options, .parser = parse_opt,
305
486
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
306
487
.doc = "Mandos plugin runner -- Run plugins" };
307
488
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
489
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
309
490
if (ret == ARGP_ERR_UNKNOWN){
310
491
fprintf(stderr, "Unknown error while parsing arguments\n");
311
492
exitstatus = EXIT_FAILURE;
312
goto end;
493
goto fallback;
313
494
}
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){
495
496
/* Opens the configfile if aviable */
497
if (argfile == NULL){
498
conffp = fopen(AFILE, "r");
499
} else {
500
conffp = fopen(argfile, "r");
501
}
502
if(conffp != NULL){
503
char *org_line = NULL;
504
char *p, *arg, *new_arg, *line;
505
size_t size = 0;
506
ssize_t sret;
507
const char whitespace_delims[] = " \r\t\f\v\n";
508
const char comment_delim[] = "#";
509
510
custom_argc = 1;
511
custom_argv = malloc(sizeof(char*) * 2);
512
if(custom_argv == NULL){
325
513
perror("malloc");
326
514
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);
515
goto fallback;
516
}
517
custom_argv[0] = argv[0];
518
custom_argv[1] = NULL;
519
520
/* for each line in the config file, strip whitespace and ignore
521
commented text */
522
while(true){
523
sret = getline(&org_line, &size, conffp);
524
if(sret == -1){
525
break;
526
}
527
528
line = org_line;
529
arg = strsep(&line, comment_delim);
530
while((p = strsep(&arg, whitespace_delims)) != NULL){
531
if(p[0] == '\0'){
532
continue;
533
}
534
new_arg = strdup(p);
535
if(new_arg == NULL){
536
perror("strdup");
537
exitstatus = EXIT_FAILURE;
538
free(org_line);
539
goto fallback;
540
}
541
542
custom_argc += 1;
543
custom_argv = realloc(custom_argv, sizeof(char *)
544
* ((unsigned int) custom_argc + 1));
545
if(custom_argv == NULL){
546
perror("realloc");
547
exitstatus = EXIT_FAILURE;
548
free(org_line);
549
goto fallback;
550
}
551
custom_argv[custom_argc-1] = new_arg;
552
custom_argv[custom_argc] = NULL;
553
}
554
}
555
free(org_line);
556
} else{
557
/* Check for harmful errors and go to fallback. Other errors might
558
not affect opening plugins */
559
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
560
perror("fopen");
561
exitstatus = EXIT_FAILURE;
562
goto fallback;
563
}
564
}
565
/* If there was any arguments from configuration file,
566
pass them to parser as command arguments */
567
if(custom_argv != NULL){
568
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
346
569
if (ret == ARGP_ERR_UNKNOWN){
347
570
fprintf(stderr, "Unknown error while parsing arguments\n");
348
571
exitstatus = EXIT_FAILURE;
349
goto end;
572
goto fallback;
350
573
}
351
574
}
352
575
357
580
for(char **a = p->argv; *a != NULL; a++){
358
581
fprintf(stderr, "\tArg: %s\n", *a);
359
582
}
583
fprintf(stderr, "...and %u environment variables\n", p->envc);
584
for(char **a = p->environ; *a != NULL; a++){
585
fprintf(stderr, "\t%s\n", *a);
586
}
360
587
}
361
588
}
362
589
590
/* Strip permissions down to nobody */
363
591
ret = setuid(uid);
364
592
if (ret == -1){
365
593
perror("setuid");
366
}
367
594
}
368
595
setgid(gid);
369
596
if (ret == -1){
370
597
perror("setgid");
371
598
}
599
600
if (plugindir == NULL){
601
dir = opendir(PDIR);
602
} else {
603
dir = opendir(plugindir);
604
}
372
605
373
dir = opendir(plugindir);
374
606
if(dir == NULL){
375
607
perror("Could not open plugin dir");
376
608
exitstatus = EXIT_FAILURE;
377
goto end;
609
goto fallback;
378
610
}
379
611
380
612
/* Set the FD_CLOEXEC flag on the directory, if possible */
385
617
if(ret < 0){
386
618
perror("set_cloexec_flag");
387
619
exitstatus = EXIT_FAILURE;
388
goto end;
620
goto fallback;
389
621
}
390
622
}
391
623
}
392
624
393
625
FD_ZERO(&rfds_all);
394
626
627
/* Read and execute any executable in the plugin directory*/
395
628
while(true){
396
629
dirst = readdir(dir);
397
630
400
633
if (errno == EBADF){
401
634
perror("readdir");
402
635
exitstatus = EXIT_FAILURE;
403
goto end;
636
goto fallback;
404
637
}
405
638
break;
406
639
}
428
661
break;
429
662
}
430
663
}
431
432
664
if(bad_name){
433
665
continue;
434
666
}
435
436
667
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
437
668
size_t suf_len = strlen(*suf);
438
669
if((d_name_len >= suf_len)
451
682
continue;
452
683
}
453
684
}
454
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
458
exitstatus = EXIT_FAILURE;
459
goto end;
685
686
char *filename;
687
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
688
if(ret < 0){
689
perror("asprintf");
690
continue;
460
691
}
461
strcpy(filename, plugindir); /* Spurious warning */
462
strcat(filename, "/"); /* Spurious warning */
463
strcat(filename, dirst->d_name); /* Spurious warning */
464
692
465
693
ret = stat(filename, &st);
466
694
if (ret == -1){
467
695
perror("stat");
468
exitstatus = EXIT_FAILURE;
469
goto end;
696
free(filename);
697
continue;
470
698
}
471
699
700
/* Ignore non-executable files */
472
701
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
473
702
if(debug){
474
703
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
477
706
free(filename);
478
707
continue;
479
708
}
480
if(getplugin(dirst->d_name, &plugin_list)->disabled){
709
710
plugin *p = getplugin(dirst->d_name);
711
if(p == NULL){
712
perror("getplugin");
713
free(filename);
714
continue;
715
}
716
if(p->disabled){
481
717
if(debug){
482
718
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
483
719
dirst->d_name);
485
721
free(filename);
486
722
continue;
487
723
}
488
plugin *p = getplugin(dirst->d_name, &plugin_list);
489
724
{
490
725
/* Add global arguments to argument list for this plugin */
491
plugin *g = getplugin(NULL, &plugin_list);
492
for(char **a = g->argv + 1; *a != NULL; a++){
493
addargument(p, *a);
494
}
495
}
496
int pipefd[2];
726
plugin *g = getplugin(NULL);
727
if(g != NULL){
728
for(char **a = g->argv + 1; *a != NULL; a++){
729
if(not add_argument(p, *a)){
730
perror("add_argument");
731
}
732
}
733
/* Add global environment variables */
734
for(char **e = g->environ; *e != NULL; e++){
735
if(not add_environment(p, *e)){
736
perror("add_environment");
737
}
738
}
739
}
740
}
741
/* If this plugin has any environment variables, we will call
742
using execve and need to duplicate the environment from this
743
process, too. */
744
if(p->environ[0] != NULL){
745
for(char **e = environ; *e != NULL; e++){
746
char *copy = strdup(*e);
747
if(copy == NULL){
748
perror("strdup");
749
continue;
750
}
751
if(not add_environment(p, copy)){
752
perror("add_environment");
753
}
754
}
755
}
756
757
int pipefd[2];
497
758
ret = pipe(pipefd);
498
759
if (ret == -1){
499
760
perror("pipe");
500
761
exitstatus = EXIT_FAILURE;
501
goto end;
762
goto fallback;
502
763
}
764
/* Ask OS to automatic close the pipe on exec */
503
765
ret = set_cloexec_flag(pipefd[0]);
504
766
if(ret < 0){
505
767
perror("set_cloexec_flag");
506
768
exitstatus = EXIT_FAILURE;
507
goto end;
769
goto fallback;
508
770
}
509
771
ret = set_cloexec_flag(pipefd[1]);
510
772
if(ret < 0){
511
773
perror("set_cloexec_flag");
512
774
exitstatus = EXIT_FAILURE;
513
goto end;
775
goto fallback;
514
776
}
515
777
/* Block SIGCHLD until process is safely in process list */
516
778
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
517
779
if(ret < 0){
518
780
perror("sigprocmask");
519
781
exitstatus = EXIT_FAILURE;
520
goto end;
782
goto fallback;
521
783
}
522
784
// Starting a new process to be watched
523
785
pid_t pid = fork();
786
if(pid == -1){
787
perror("fork");
788
exitstatus = EXIT_FAILURE;
789
goto fallback;
790
}
524
791
if(pid == 0){
525
792
/* this is the child process */
526
793
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
545
812
above and must now close it manually here. */
546
813
closedir(dir);
547
814
}
548
if(execv(filename, p->argv) < 0){
549
perror("execv");
550
_exit(EXIT_FAILURE);
815
if(p->environ[0] == NULL){
816
if(execv(filename, p->argv) < 0){
817
perror("execv");
818
_exit(EXIT_FAILURE);
819
}
820
} else {
821
if(execve(filename, p->argv, p->environ) < 0){
822
perror("execve");
823
_exit(EXIT_FAILURE);
824
}
551
825
}
552
826
/* no return */
553
827
}
554
/* parent process */
828
/* Parent process */
829
close(pipefd[1]); /* Close unused write end of pipe */
555
830
free(filename);
556
close(pipefd[1]); /* close unused write end of pipe */
557
process *new_process = malloc(sizeof(process));
558
if (new_process == NULL){
559
perror("malloc");
831
plugin *new_plugin = getplugin(dirst->d_name);
832
if (new_plugin == NULL){
833
perror("getplugin");
560
834
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
561
835
if(ret < 0){
562
perror("sigprocmask");
836
perror("sigprocmask");
563
837
}
564
838
exitstatus = EXIT_FAILURE;
565
goto end;
839
goto fallback;
566
840
}
567
841
568
*new_process = (struct process){ .pid = pid,
569
.fd = pipefd[0],
570
.next = process_list };
571
// List handling
572
process_list = new_process;
842
new_plugin->pid = pid;
843
new_plugin->fd = pipefd[0];
844
573
845
/* Unblock SIGCHLD so signal handler can be run if this process
574
846
has already completed */
575
847
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
576
848
if(ret < 0){
577
849
perror("sigprocmask");
578
850
exitstatus = EXIT_FAILURE;
579
goto end;
580
}
581
582
FD_SET(new_process->fd, &rfds_all);
583
584
if (maxfd < new_process->fd){
585
maxfd = new_process->fd;
586
}
587
588
}
589
590
/* Free the plugin list */
591
for(plugin *next; plugin_list != NULL; plugin_list = next){
592
next = plugin_list->next;
593
free(plugin_list->argv);
594
free(plugin_list);
851
goto fallback;
852
}
853
854
FD_SET(new_plugin->fd, &rfds_all);
855
856
if (maxfd < new_plugin->fd){
857
maxfd = new_plugin->fd;
858
}
859
595
860
}
596
861
597
862
closedir(dir);
598
863
dir = NULL;
599
600
if (process_list == NULL){
601
fprintf(stderr, "No plugin processes started. Incorrect plugin"
602
" directory?\n");
603
process_list = NULL;
864
865
for(plugin *p = plugin_list; p != NULL; p = p->next){
866
if(p->pid != 0){
867
break;
868
}
869
if(p->next == NULL){
870
fprintf(stderr, "No plugin processes started. Incorrect plugin"
871
" directory?\n");
872
free_plugin_list();
873
}
604
874
}
605
while(process_list){
875
876
/* Main loop while running plugins exist */
877
while(plugin_list){
606
878
fd_set rfds = rfds_all;
607
879
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
608
880
if (select_ret == -1){
609
881
perror("select");
610
882
exitstatus = EXIT_FAILURE;
611
goto end;
883
goto fallback;
612
884
}
613
885
/* OK, now either a process completed, or something can be read
614
886
from one of them */
615
for(process *proc = process_list; proc ; proc = proc->next){
887
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
616
888
/* Is this process completely done? */
617
889
if(proc->eof and proc->completed){
618
890
/* Only accept the plugin output if it exited cleanly */
619
891
if(not WIFEXITED(proc->status)
620
892
or WEXITSTATUS(proc->status) != 0){
621
893
/* Bad exit by plugin */
894
622
895
if(debug){
623
896
if(WIFEXITED(proc->status)){
624
897
fprintf(stderr, "Plugin %u exited with status %d\n",
633
906
(unsigned int) (proc->pid));
634
907
}
635
908
}
909
636
910
/* Remove the plugin */
637
911
FD_CLR(proc->fd, &rfds_all);
912
638
913
/* Block signal while modifying process_list */
639
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
914
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
640
915
if(ret < 0){
641
916
perror("sigprocmask");
642
917
exitstatus = EXIT_FAILURE;
643
goto end;
644
}
645
/* Delete this process entry from the list */
646
if(process_list == proc){
647
/* First one - simple */
648
process_list = proc->next;
649
} else {
650
/* Second one or later */
651
for(process *p = process_list; p != NULL; p = p->next){
652
if(p->next == proc){
653
p->next = proc->next;
654
break;
655
}
656
}
657
}
918
goto fallback;
919
}
920
free_plugin(proc);
658
921
/* We are done modifying process list, so unblock signal */
659
922
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
660
923
NULL);
661
924
if(ret < 0){
662
925
perror("sigprocmask");
663
}
664
free(proc->buffer);
665
free(proc);
666
/* We deleted this process from the list, so we can't go
667
proc->next. Therefore, start over from the beginning of
668
the process list */
669
break;
926
exitstatus = EXIT_FAILURE;
927
goto fallback;
928
}
929
930
if(plugin_list == NULL){
931
break;
932
}
933
continue;
670
934
}
935
671
936
/* This process exited nicely, so print its buffer */
672
937
673
bool bret = print_out_password(proc->buffer, proc->buffer_length);
938
bool bret = print_out_password(proc->buffer,
939
proc->buffer_length);
674
940
if(not bret){
675
941
perror("print_out_password");
676
942
exitstatus = EXIT_FAILURE;
677
943
}
678
goto end;
944
goto fallback;
679
945
}
946
680
947
/* This process has not completed. Does it have any output? */
681
948
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
682
949
/* This process had nothing to say at this time */
689
956
if (proc->buffer == NULL){
690
957
perror("malloc");
691
958
exitstatus = EXIT_FAILURE;
692
goto end;
959
goto fallback;
693
960
}
694
961
proc->buffer_size += BUFFER_SIZE;
695
962
}
710
977
}
711
978
712
979
713
end:
980
fallback:
714
981
715
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
716
/* Fallback if all plugins failed or an error occured */
982
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
983
/* Fallback if all plugins failed, none are found or an error
984
occured */
717
985
bool bret;
718
986
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
719
987
char *passwordbuffer = getpass("Password: ");
721
989
if(not bret){
722
990
perror("print_out_password");
723
991
exitstatus = EXIT_FAILURE;
724
goto end;
725
992
}
726
993
}
727
994
728
995
/* Restore old signal handler */
729
sigaction(SIGCHLD, &old_sigchld_action, NULL);
730
731
free(plus_argv);
732
733
/* Free the plugin list */
734
for(plugin *next; plugin_list != NULL; plugin_list = next){
735
next = plugin_list->next;
736
free(plugin_list->argv);
737
free(plugin_list);
996
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
997
if(ret == -1){
998
perror("sigaction");
999
exitstatus = EXIT_FAILURE;
1000
}
1001
1002
if(custom_argv != NULL){
1003
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1004
free(*arg);
1005
}
1006
free(custom_argv);
738
1007
}
739
1008
740
1009
if(dir != NULL){
742
1011
}
743
1012
744
1013
/* Free the process list and kill the processes */
745
for(process *next; process_list != NULL; process_list = next){
746
next = process_list->next;
747
close(process_list->fd);
748
ret = kill(process_list->pid, SIGTERM);
749
if(ret == -1 and errno != ESRCH){
750
/* set-uid proccesses migth not get closed */
751
perror("kill");
1014
for(plugin *p = plugin_list; p != NULL; p = p->next){
1015
if(p->pid != 0){
1016
close(p->fd);
1017
ret = kill(p->pid, SIGTERM);
1018
if(ret == -1 and errno != ESRCH){
1019
/* Set-uid proccesses might not get closed */
1020
perror("kill");
1021
}
752
1022
}
753
free(process_list->buffer);
754
free(process_list);
755
1023
}
756
1024
757
1025
/* Wait for any remaining child processes to terminate */
761
1029
if(errno != ECHILD){
762
1030
perror("wait");
763
1031
}
1032
1033
free_plugin_list();
1034
1035
free(plugindir);
1036
free(argfile);
764
1037
765
1038
return exitstatus;
766
1039
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0