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- Committer: Björn Påhlsson
- Date: 2008-08-09 20:07:37 UTC
- mfrom: (54 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 56.
- Revision ID: belorn@braxen-20080809200737-nkb9rigetzv0ew60
merge
- files added:
- network-protocol.txt
- files removed:
- .bzrignore
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- files modified:
- Makefile
added
removed
mandos-client.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
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> /* strsep, strlen(), asprintf() */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
55
56
#include <errno.h> /* errno */
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,
60
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, 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
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
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*/
69
struct process;
70
71
typedef struct process{
86
72
pid_t pid;
87
73
int fd;
88
74
char *buffer;
89
75
size_t buffer_size;
90
76
size_t buffer_length;
91
77
bool eof;
92
volatile bool completed;
93
volatile int status;
78
bool completed;
79
int status;
80
struct process *next;
81
} process;
82
83
typedef struct plugin{
84
char *name; /* can be NULL or any plugin name */
85
char **argv;
86
int argc;
87
bool disabled;
94
88
struct plugin *next;
95
89
} plugin;
96
90
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){
91
static plugin *getplugin(char *name, plugin **plugin_list){
92
for (plugin *p = *plugin_list; p != NULL; p = p->next){
104
93
if ((p->name == name)
105
94
or (p->name and name and (strcmp(p->name, name) == 0))){
106
95
return p;
109
98
/* Create a new plugin */
110
99
plugin *new_plugin = malloc(sizeof(plugin));
111
100
if (new_plugin == NULL){
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
101
perror("malloc");
102
exit(EXIT_FAILURE);
103
}
104
new_plugin->name = name;
127
105
new_plugin->argv = malloc(sizeof(char *) * 2);
128
106
if (new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
107
perror("malloc");
108
exit(EXIT_FAILURE);
132
109
}
133
new_plugin->argv[0] = copy_name;
110
new_plugin->argv[0] = name;
134
111
new_plugin->argv[1] = NULL;
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
112
new_plugin->argc = 1;
113
new_plugin->disabled = false;
114
new_plugin->next = *plugin_list;
145
115
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
116
*plugin_list = new_plugin;
147
117
return new_plugin;
148
118
}
149
119
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
return add_to_char_array(def, &(p->environ), &(p->envc));
120
static void addargument(plugin *p, char *arg){
121
p->argv[p->argc] = arg;
122
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
123
if (p->argv == NULL){
124
perror("malloc");
125
exit(EXIT_FAILURE);
126
}
127
p->argc++;
128
p->argv[p->argc] = NULL;
187
129
}
188
130
189
131
/*
202
144
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
203
145
}
204
146
205
206
/* Mark processes as completed when they exit, and save their exit
147
const char *argp_program_version = "plugbasedclient 0.9";
148
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
149
150
process *process_list = NULL;
151
152
/* Mark a process as completed when it exits, and save its exit
207
153
status. */
208
154
void handle_sigchld(__attribute__((unused)) int sig){
209
while(true){
210
plugin *proc = plugin_list;
211
int status;
212
pid_t pid = waitpid(-1, &status, WNOHANG);
213
if(pid == 0){
214
/* Only still running child processes */
215
break;
216
}
217
if(pid == -1){
218
if (errno != ECHILD){
219
perror("waitpid");
220
}
221
/* No child processes */
222
break;
223
}
224
225
/* A child exited, find it in process_list */
226
while(proc != NULL and proc->pid != pid){
227
proc = proc->next;
228
}
229
if(proc == NULL){
230
/* Process not found in process list */
231
continue;
232
}
233
proc->status = status;
234
proc->completed = true;
235
}
236
}
237
238
/* Prints out a password to stdout */
239
bool print_out_password(const char *buffer, size_t length){
240
ssize_t ret;
241
if(length>0 and buffer[length-1] == '\n'){
242
length--;
243
}
244
for(size_t written = 0; written < length; written += (size_t)ret){
245
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
246
length - written));
247
if(ret < 0){
248
return false;
249
}
250
}
251
return true;
252
}
253
254
/* Removes and free a plugin from the plugin list */
255
static void free_plugin(plugin *plugin_node){
256
257
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
258
free(*arg);
259
}
260
free(plugin_node->argv);
261
for(char **env = plugin_node->environ; *env != NULL; env++){
262
free(*env);
263
}
264
free(plugin_node->environ);
265
free(plugin_node->buffer);
266
267
/* Removes the plugin from the singly-linked list */
268
if(plugin_node == plugin_list){
269
/* First one - simple */
270
plugin_list = plugin_list->next;
271
} else {
272
/* Second one or later */
273
for(plugin *p = plugin_list; p != NULL; p = p->next){
274
if(p->next == plugin_node){
275
p->next = plugin_node->next;
276
break;
277
}
278
}
279
}
280
281
free(plugin_node);
282
}
283
284
static void free_plugin_list(void){
285
while(plugin_list != NULL){
286
free_plugin(plugin_list);
287
}
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;
288
171
}
289
172
290
173
int main(int argc, char *argv[]){
291
char *plugindir = NULL;
292
char *argfile = NULL;
293
FILE *conffp;
174
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
294
175
size_t d_name_len;
295
176
DIR *dir = NULL;
296
177
struct dirent *dirst;
304
185
struct sigaction old_sigchld_action;
305
186
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
306
187
.sa_flags = SA_NOCLDSTOP };
307
char **custom_argv = NULL;
308
int custom_argc = 0;
188
char *plus_options = NULL;
189
char **plus_argv = NULL;
309
190
310
191
/* Establish a signal handler */
311
192
sigemptyset(&sigchld_action.sa_mask);
312
193
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
313
if(ret == -1){
194
if(ret < 0){
314
195
perror("sigaddset");
315
exitstatus = EXIT_FAILURE;
316
goto fallback;
196
exit(EXIT_FAILURE);
317
197
}
318
198
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
319
if(ret == -1){
199
if(ret < 0){
320
200
perror("sigaction");
321
exitstatus = EXIT_FAILURE;
322
goto fallback;
201
exit(EXIT_FAILURE);
323
202
}
324
203
325
204
/* The options we understand. */
327
206
{ .name = "global-options", .key = 'g',
328
207
.arg = "OPTION[,OPTION[,...]]",
329
208
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
331
.arg = "VAR=value",
332
.doc = "Environment variable passed to all plugins" },
333
209
{ .name = "options-for", .key = 'o',
334
210
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
335
211
.doc = "Options passed only to specified plugin" },
336
{ .name = "envs-for", .key = 'f',
337
.arg = "PLUGIN:ENV=value",
338
.doc = "Environment variable passed to specified plugin" },
339
212
{ .name = "disable", .key = 'd',
340
213
.arg = "PLUGIN",
341
214
.doc = "Disable a specific plugin", .group = 1 },
342
215
{ .name = "plugin-dir", .key = 128,
343
216
.arg = "DIRECTORY",
344
217
.doc = "Specify a different plugin directory", .group = 2 },
345
{ .name = "config-file", .key = 129,
346
.arg = "FILE",
347
.doc = "Specify a different configuration file", .group = 2 },
348
{ .name = "userid", .key = 130,
349
.arg = "ID", .flags = 0,
350
.doc = "User ID the plugins will run as", .group = 3 },
351
{ .name = "groupid", .key = 131,
352
.arg = "ID", .flags = 0,
353
.doc = "Group ID the plugins will run as", .group = 3 },
354
{ .name = "debug", .key = 132,
355
.doc = "Debug mode", .group = 4 },
218
{ .name = "userid", .key = 129,
219
.arg = "ID", .flags = 0,
220
.doc = "User ID the plugins will run as", .group = 2 },
221
{ .name = "groupid", .key = 130,
222
.arg = "ID", .flags = 0,
223
.doc = "Group ID the plugins will run as", .group = 2 },
224
{ .name = "debug", .key = 131,
225
.doc = "Debug mode", .group = 3 },
356
226
{ .name = NULL }
357
227
};
358
228
359
error_t parse_opt (int key, char *arg, __attribute__((unused))
360
struct argp_state *state) {
229
error_t parse_opt (int key, char *arg, struct argp_state *state) {
361
230
/* Get the INPUT argument from `argp_parse', which we know is a
362
231
pointer to our plugin list pointer. */
232
plugin **plugins = state->input;
363
233
switch (key) {
364
case 'g': /* --global-options */
365
if (arg != NULL){
366
char *p;
367
while((p = strsep(&arg, ",")) != NULL){
368
if(p[0] == '\0'){
369
continue;
370
}
371
if(not add_argument(getplugin(NULL), p)){
372
perror("add_argument");
373
return ARGP_ERR_UNKNOWN;
374
}
375
}
376
}
377
break;
378
case 'e': /* --global-envs */
379
if(arg == NULL){
380
break;
381
}
382
{
383
char *envdef = strdup(arg);
384
if(envdef == NULL){
385
break;
386
}
387
if(not add_environment(getplugin(NULL), envdef)){
388
perror("add_environment");
389
}
390
}
391
break;
392
case 'o': /* --options-for */
393
if (arg != NULL){
394
char *p_name = strsep(&arg, ":");
395
if(p_name[0] == '\0'){
396
break;
397
}
398
char *opt = strsep(&arg, ":");
399
if(opt[0] == '\0'){
400
break;
401
}
402
if(opt != NULL){
403
char *p;
404
while((p = strsep(&opt, ",")) != NULL){
405
if(p[0] == '\0'){
406
continue;
407
}
408
if(not add_argument(getplugin(p_name), p)){
409
perror("add_argument");
410
return ARGP_ERR_UNKNOWN;
411
}
412
}
413
}
414
}
415
break;
416
case 'f': /* --envs-for */
417
if(arg == NULL){
418
break;
419
}
420
{
421
char *envdef = strchr(arg, ':');
422
if(envdef == NULL){
423
break;
424
}
425
char *p_name = strndup(arg, (size_t) (envdef-arg));
426
if(p_name == NULL){
427
break;
428
}
429
envdef++;
430
if(not add_environment(getplugin(p_name), envdef)){
431
perror("add_environment");
432
}
433
}
434
break;
435
case 'd': /* --disable */
436
if (arg != NULL){
437
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
440
}
441
p->disabled = true;
442
}
443
break;
444
case 128: /* --plugin-dir */
445
plugindir = strdup(arg);
446
if(plugindir == NULL){
447
perror("strdup");
448
}
449
break;
450
case 129: /* --config-file */
451
argfile = strdup(arg);
452
if(argfile == NULL){
453
perror("strdup");
454
}
455
break;
456
case 130: /* --userid */
234
case 'g':
235
if (arg != NULL){
236
char *p = strtok(arg, ",");
237
do{
238
addargument(getplugin(NULL, plugins), p);
239
p = strtok(NULL, ",");
240
} while (p != NULL);
241
}
242
break;
243
case 'o':
244
if (arg != NULL){
245
char *name = strtok(arg, ":");
246
char *p = strtok(NULL, ":");
247
if(p != NULL){
248
p = strtok(p, ",");
249
do{
250
addargument(getplugin(name, plugins), p);
251
p = strtok(NULL, ",");
252
} while (p != NULL);
253
}
254
}
255
break;
256
case 'd':
257
if (arg != NULL){
258
getplugin(arg, plugins)->disabled = true;
259
}
260
break;
261
case 128:
262
plugindir = arg;
263
break;
264
case 129:
457
265
uid = (uid_t)strtol(arg, NULL, 10);
458
266
break;
459
case 131: /* --groupid */
267
case 130:
460
268
gid = (gid_t)strtol(arg, NULL, 10);
461
269
break;
462
case 132: /* --debug */
270
case 131:
463
271
debug = true;
464
272
break;
465
273
case ARGP_KEY_ARG:
466
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
274
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
275
argp_usage (state);
276
}
277
plus_options = arg;
467
278
break;
468
279
case ARGP_KEY_END:
469
280
break;
473
284
return 0;
474
285
}
475
286
287
plugin *plugin_list = NULL;
288
476
289
struct argp argp = { .options = options, .parser = parse_opt,
477
290
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
478
291
.doc = "Mandos plugin runner -- Run plugins" };
479
292
480
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
293
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
481
294
if (ret == ARGP_ERR_UNKNOWN){
482
fprintf(stderr, "Unknown error while parsing arguments\n");
295
fprintf(stderr, "Unkown error while parsing arguments\n");
483
296
exitstatus = EXIT_FAILURE;
484
goto fallback;
297
goto end;
485
298
}
486
487
/* Opens the configfile if aviable */
488
if (argfile == NULL){
489
conffp = fopen(AFILE, "r");
490
} else {
491
conffp = fopen(argfile, "r");
492
}
493
if(conffp != NULL){
494
char *org_line = NULL;
495
char *p, *arg, *new_arg, *line;
496
size_t size = 0;
497
ssize_t sret;
498
const char whitespace_delims[] = " \r\t\f\v\n";
499
const char comment_delim[] = "#";
500
501
custom_argc = 1;
502
custom_argv = malloc(sizeof(char*) * 2);
503
if(custom_argv == NULL){
299
300
if(plus_options){
301
/* This is a mangled argument in the form of
302
"+--option+--other-option=parameter+--yet-another-option", etc */
303
/* Make new argc and argv vars, and call argp_parse() again. */
304
plus_options++; /* skip the first '+' character */
305
const char delims[] = "+";
306
char *arg;
307
int new_argc = 1;
308
plus_argv = malloc(sizeof(char*) * 2);
309
if(plus_argv == NULL){
504
310
perror("malloc");
505
311
exitstatus = EXIT_FAILURE;
506
goto fallback;
507
}
508
custom_argv[0] = argv[0];
509
custom_argv[1] = NULL;
510
511
/* for each line in the config file, strip whitespace and ignore
512
commented text */
513
while(true){
514
sret = getline(&org_line, &size, conffp);
515
if(sret == -1){
516
break;
517
}
518
519
line = org_line;
520
arg = strsep(&line, comment_delim);
521
while((p = strsep(&arg, whitespace_delims)) != NULL){
522
if(p[0] == '\0'){
523
continue;
524
}
525
new_arg = strdup(p);
526
if(new_arg == NULL){
527
perror("strdup");
528
exitstatus = EXIT_FAILURE;
529
free(org_line);
530
goto fallback;
531
}
532
533
custom_argc += 1;
534
custom_argv = realloc(custom_argv, sizeof(char *)
535
* ((unsigned int) custom_argc + 1));
536
if(custom_argv == NULL){
537
perror("realloc");
538
exitstatus = EXIT_FAILURE;
539
free(org_line);
540
goto fallback;
541
}
542
custom_argv[custom_argc-1] = new_arg;
543
custom_argv[custom_argc] = NULL;
544
}
545
}
546
free(org_line);
547
} else{
548
/* Check for harmful errors and go to fallback. Other errors might
549
not affect opening plugins */
550
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
551
perror("fopen");
552
exitstatus = EXIT_FAILURE;
553
goto fallback;
554
}
555
}
556
/* If there was any arguments from configuration file,
557
pass them to parser as command arguments */
558
if(custom_argv != NULL){
559
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
312
goto end;
313
}
314
plus_argv[0] = argv[0];
315
plus_argv[1] = NULL;
316
arg = strtok(plus_options, delims); /* Get first argument */
317
while(arg != NULL){
318
new_argc++;
319
plus_argv = realloc(plus_argv, sizeof(char *)
320
* ((unsigned int) new_argc + 1));
321
if(plus_argv == NULL){
322
perror("realloc");
323
exitstatus = EXIT_FAILURE;
324
goto end;
325
}
326
plus_argv[new_argc-1] = arg;
327
plus_argv[new_argc] = NULL;
328
arg = strtok(NULL, delims); /* Get next argument */
329
}
330
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
560
331
if (ret == ARGP_ERR_UNKNOWN){
561
fprintf(stderr, "Unknown error while parsing arguments\n");
332
fprintf(stderr, "Unkown error while parsing arguments\n");
562
333
exitstatus = EXIT_FAILURE;
563
goto fallback;
334
goto end;
564
335
}
565
336
}
566
337
571
342
for(char **a = p->argv; *a != NULL; a++){
572
343
fprintf(stderr, "\tArg: %s\n", *a);
573
344
}
574
fprintf(stderr, "...and %u environment variables\n", p->envc);
575
for(char **a = p->environ; *a != NULL; a++){
576
fprintf(stderr, "\t%s\n", *a);
577
}
578
345
}
579
346
}
580
581
/* Strip permissions down to nobody */
347
582
348
ret = setuid(uid);
583
349
if (ret == -1){
584
350
perror("setuid");
585
}
351
}
352
586
353
setgid(gid);
587
354
if (ret == -1){
588
355
perror("setgid");
589
356
}
590
591
if (plugindir == NULL){
592
dir = opendir(PDIR);
593
} else {
594
dir = opendir(plugindir);
595
}
596
357
358
dir = opendir(plugindir);
597
359
if(dir == NULL){
598
360
perror("Could not open plugin dir");
599
361
exitstatus = EXIT_FAILURE;
600
goto fallback;
362
goto end;
601
363
}
602
364
603
365
/* Set the FD_CLOEXEC flag on the directory, if possible */
608
370
if(ret < 0){
609
371
perror("set_cloexec_flag");
610
372
exitstatus = EXIT_FAILURE;
611
goto fallback;
373
goto end;
612
374
}
613
375
}
614
376
}
615
377
616
378
FD_ZERO(&rfds_all);
617
618
/* Read and execute any executable in the plugin directory*/
379
619
380
while(true){
620
381
dirst = readdir(dir);
621
382
624
385
if (errno == EBADF){
625
386
perror("readdir");
626
387
exitstatus = EXIT_FAILURE;
627
goto fallback;
388
goto end;
628
389
}
629
390
break;
630
391
}
652
413
break;
653
414
}
654
415
}
416
655
417
if(bad_name){
656
418
continue;
657
419
}
420
658
421
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
659
422
size_t suf_len = strlen(*suf);
660
423
if((d_name_len >= suf_len)
673
436
continue;
674
437
}
675
438
}
676
677
char *filename;
678
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
679
if(ret < 0){
680
perror("asprintf");
681
continue;
439
440
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
441
if (filename == NULL){
442
perror("malloc");
443
exitstatus = EXIT_FAILURE;
444
goto end;
682
445
}
446
strcpy(filename, plugindir); /* Spurious warning */
447
strcat(filename, "/"); /* Spurious warning */
448
strcat(filename, dirst->d_name); /* Spurious warning */
683
449
684
450
ret = stat(filename, &st);
685
451
if (ret == -1){
686
452
perror("stat");
687
free(filename);
688
continue;
453
exitstatus = EXIT_FAILURE;
454
goto end;
689
455
}
690
691
/* Ignore non-executable files */
456
692
457
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
693
458
if(debug){
694
459
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
697
462
free(filename);
698
463
continue;
699
464
}
700
701
plugin *p = getplugin(dirst->d_name);
702
if(p == NULL){
703
perror("getplugin");
704
free(filename);
705
continue;
706
}
707
if(p->disabled){
465
if(getplugin(dirst->d_name, &plugin_list)->disabled){
708
466
if(debug){
709
467
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
710
468
dirst->d_name);
712
470
free(filename);
713
471
continue;
714
472
}
473
plugin *p = getplugin(dirst->d_name, &plugin_list);
715
474
{
716
475
/* Add global arguments to argument list for this plugin */
717
plugin *g = getplugin(NULL);
718
if(g != NULL){
719
for(char **a = g->argv + 1; *a != NULL; a++){
720
if(not add_argument(p, *a)){
721
perror("add_argument");
722
}
723
}
724
/* Add global environment variables */
725
for(char **e = g->environ; *e != NULL; e++){
726
if(not add_environment(p, *e)){
727
perror("add_environment");
728
}
729
}
730
}
731
}
732
/* If this plugin has any environment variables, we will call
733
using execve and need to duplicate the environment from this
734
process, too. */
735
if(p->environ[0] != NULL){
736
for(char **e = environ; *e != NULL; e++){
737
char *copy = strdup(*e);
738
if(copy == NULL){
739
perror("strdup");
740
continue;
741
}
742
if(not add_environment(p, copy)){
743
perror("add_environment");
744
}
745
}
746
}
747
748
int pipefd[2];
476
plugin *g = getplugin(NULL, &plugin_list);
477
for(char **a = g->argv + 1; *a != NULL; a++){
478
addargument(p, *a);
479
}
480
}
481
int pipefd[2];
749
482
ret = pipe(pipefd);
750
483
if (ret == -1){
751
484
perror("pipe");
752
485
exitstatus = EXIT_FAILURE;
753
goto fallback;
486
goto end;
754
487
}
755
/* Ask OS to automatic close the pipe on exec */
756
488
ret = set_cloexec_flag(pipefd[0]);
757
489
if(ret < 0){
758
490
perror("set_cloexec_flag");
759
491
exitstatus = EXIT_FAILURE;
760
goto fallback;
492
goto end;
761
493
}
762
494
ret = set_cloexec_flag(pipefd[1]);
763
495
if(ret < 0){
764
496
perror("set_cloexec_flag");
765
497
exitstatus = EXIT_FAILURE;
766
goto fallback;
498
goto end;
767
499
}
768
500
/* Block SIGCHLD until process is safely in process list */
769
501
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
770
502
if(ret < 0){
771
503
perror("sigprocmask");
772
504
exitstatus = EXIT_FAILURE;
773
goto fallback;
505
goto end;
774
506
}
775
507
// Starting a new process to be watched
776
508
pid_t pid = fork();
777
if(pid == -1){
778
perror("fork");
779
exitstatus = EXIT_FAILURE;
780
goto fallback;
781
}
782
509
if(pid == 0){
783
510
/* this is the child process */
784
511
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
803
530
above and must now close it manually here. */
804
531
closedir(dir);
805
532
}
806
if(p->environ[0] == NULL){
807
if(execv(filename, p->argv) < 0){
808
perror("execv");
809
_exit(EXIT_FAILURE);
810
}
811
} else {
812
if(execve(filename, p->argv, p->environ) < 0){
813
perror("execve");
814
_exit(EXIT_FAILURE);
815
}
533
if(execv(filename, p->argv) < 0){
534
perror("execv");
535
_exit(EXIT_FAILURE);
816
536
}
817
537
/* no return */
818
538
}
819
/* Parent process */
820
close(pipefd[1]); /* Close unused write end of pipe */
539
/* parent process */
821
540
free(filename);
822
plugin *new_plugin = getplugin(dirst->d_name);
823
if (new_plugin == NULL){
824
perror("getplugin");
541
close(pipefd[1]); /* close unused write end of pipe */
542
process *new_process = malloc(sizeof(process));
543
if (new_process == NULL){
544
perror("malloc");
825
545
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
826
546
if(ret < 0){
827
perror("sigprocmask");
547
perror("sigprocmask");
828
548
}
829
549
exitstatus = EXIT_FAILURE;
830
goto fallback;
550
goto end;
831
551
}
832
552
833
new_plugin->pid = pid;
834
new_plugin->fd = pipefd[0];
835
553
*new_process = (struct process){ .pid = pid,
554
.fd = pipefd[0],
555
.next = process_list };
556
// List handling
557
process_list = new_process;
836
558
/* Unblock SIGCHLD so signal handler can be run if this process
837
559
has already completed */
838
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
839
561
if(ret < 0){
840
562
perror("sigprocmask");
841
563
exitstatus = EXIT_FAILURE;
842
goto fallback;
843
}
844
845
FD_SET(new_plugin->fd, &rfds_all);
846
847
if (maxfd < new_plugin->fd){
848
maxfd = new_plugin->fd;
849
}
850
564
goto end;
565
}
566
567
FD_SET(new_process->fd, &rfds_all);
568
569
if (maxfd < new_process->fd){
570
maxfd = new_process->fd;
571
}
572
573
}
574
575
/* Free the plugin list */
576
for(plugin *next; plugin_list != NULL; plugin_list = next){
577
next = plugin_list->next;
578
free(plugin_list->argv);
579
free(plugin_list);
851
580
}
852
581
853
582
closedir(dir);
854
583
dir = NULL;
855
856
for(plugin *p = plugin_list; p != NULL; p = p->next){
857
if(p->pid != 0){
858
break;
859
}
860
if(p->next == NULL){
861
fprintf(stderr, "No plugin processes started. Incorrect plugin"
862
" directory?\n");
863
free_plugin_list();
864
}
584
585
if (process_list == NULL){
586
fprintf(stderr, "No plugin processes started, exiting\n");
587
exitstatus = EXIT_FAILURE;
588
goto end;
865
589
}
866
867
/* Main loop while running plugins exist */
868
while(plugin_list){
590
while(process_list){
869
591
fd_set rfds = rfds_all;
870
592
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
871
593
if (select_ret == -1){
872
594
perror("select");
873
595
exitstatus = EXIT_FAILURE;
874
goto fallback;
596
goto end;
875
597
}
876
598
/* OK, now either a process completed, or something can be read
877
599
from one of them */
878
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
600
for(process *proc = process_list; proc ; proc = proc->next){
879
601
/* Is this process completely done? */
880
602
if(proc->eof and proc->completed){
881
603
/* Only accept the plugin output if it exited cleanly */
882
604
if(not WIFEXITED(proc->status)
883
605
or WEXITSTATUS(proc->status) != 0){
884
606
/* Bad exit by plugin */
885
886
607
if(debug){
887
608
if(WIFEXITED(proc->status)){
888
fprintf(stderr, "Plugin %u exited with status %d\n",
889
(unsigned int) (proc->pid),
890
WEXITSTATUS(proc->status));
609
fprintf(stderr, "Plugin %d exited with status %d\n",
610
proc->pid, WEXITSTATUS(proc->status));
891
611
} else if(WIFSIGNALED(proc->status)) {
892
fprintf(stderr, "Plugin %u killed by signal %d\n",
893
(unsigned int) (proc->pid),
894
WTERMSIG(proc->status));
612
fprintf(stderr, "Plugin %d killed by signal %d\n",
613
proc->pid, WTERMSIG(proc->status));
895
614
} else if(WCOREDUMP(proc->status)){
896
fprintf(stderr, "Plugin %d dumped core\n",
897
(unsigned int) (proc->pid));
615
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
898
616
}
899
617
}
900
901
618
/* Remove the plugin */
902
619
FD_CLR(proc->fd, &rfds_all);
903
904
620
/* Block signal while modifying process_list */
905
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
621
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
906
622
if(ret < 0){
907
623
perror("sigprocmask");
908
624
exitstatus = EXIT_FAILURE;
909
goto fallback;
910
}
911
free_plugin(proc);
625
goto end;
626
}
627
/* Delete this process entry from the list */
628
if(process_list == proc){
629
/* First one - simple */
630
process_list = proc->next;
631
} else {
632
/* Second one or later */
633
for(process *p = process_list; p != NULL; p = p->next){
634
if(p->next == proc){
635
p->next = proc->next;
636
break;
637
}
638
}
639
}
912
640
/* We are done modifying process list, so unblock signal */
913
641
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
914
642
NULL);
915
643
if(ret < 0){
916
644
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
918
goto fallback;
919
}
920
921
if(plugin_list == NULL){
922
break;
923
}
924
continue;
645
}
646
free(proc->buffer);
647
free(proc);
648
/* We deleted this process from the list, so we can't go
649
proc->next. Therefore, start over from the beginning of
650
the process list */
651
break;
925
652
}
926
927
653
/* This process exited nicely, so print its buffer */
928
929
bool bret = print_out_password(proc->buffer,
930
proc->buffer_length);
931
if(not bret){
932
perror("print_out_password");
933
exitstatus = EXIT_FAILURE;
654
for(size_t written = 0; written < proc->buffer_length;
655
written += (size_t)ret){
656
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
657
proc->buffer + written,
658
proc->buffer_length
659
- written));
660
if(ret < 0){
661
perror("write");
662
exitstatus = EXIT_FAILURE;
663
goto end;
664
}
934
665
}
935
goto fallback;
666
goto end;
936
667
}
937
938
668
/* This process has not completed. Does it have any output? */
939
669
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
940
670
/* This process had nothing to say at this time */
947
677
if (proc->buffer == NULL){
948
678
perror("malloc");
949
679
exitstatus = EXIT_FAILURE;
950
goto fallback;
680
goto end;
951
681
}
952
682
proc->buffer_size += BUFFER_SIZE;
953
683
}
966
696
}
967
697
}
968
698
}
969
970
971
fallback:
972
973
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
974
/* Fallback if all plugins failed, none are found or an error
975
occured */
976
bool bret;
977
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
978
char *passwordbuffer = getpass("Password: ");
979
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
980
if(not bret){
981
perror("print_out_password");
982
exitstatus = EXIT_FAILURE;
983
}
699
if(process_list == NULL){
700
fprintf(stderr, "All plugin processes failed, exiting\n");
701
exitstatus = EXIT_FAILURE;
984
702
}
985
703
704
end:
986
705
/* Restore old signal handler */
987
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
988
if(ret == -1){
989
perror("sigaction");
990
exitstatus = EXIT_FAILURE;
991
}
992
993
if(custom_argv != NULL){
994
for(char **arg = custom_argv+1; *arg != NULL; arg++){
995
free(*arg);
996
}
997
free(custom_argv);
706
sigaction(SIGCHLD, &old_sigchld_action, NULL);
707
708
free(plus_argv);
709
710
/* Free the plugin list */
711
for(plugin *next; plugin_list != NULL; plugin_list = next){
712
next = plugin_list->next;
713
free(plugin_list->argv);
714
free(plugin_list);
998
715
}
999
716
1000
717
if(dir != NULL){
1002
719
}
1003
720
1004
721
/* Free the process list and kill the processes */
1005
for(plugin *p = plugin_list; p != NULL; p = p->next){
1006
if(p->pid != 0){
1007
close(p->fd);
1008
ret = kill(p->pid, SIGTERM);
1009
if(ret == -1 and errno != ESRCH){
1010
/* Set-uid proccesses might not get closed */
1011
perror("kill");
1012
}
722
for(process *next; process_list != NULL; process_list = next){
723
next = process_list->next;
724
close(process_list->fd);
725
ret = kill(process_list->pid, SIGTERM);
726
if(ret == -1 and errno != ESRCH){
727
/* set-uid proccesses migth not get closed */
728
perror("kill");
1013
729
}
730
free(process_list->buffer);
731
free(process_list);
1014
732
}
1015
733
1016
734
/* Wait for any remaining child processes to terminate */
1020
738
if(errno != ECHILD){
1021
739
perror("wait");
1022
740
}
1023
1024
free_plugin_list();
1025
1026
free(plugindir);
1027
free(argfile);
1028
741
1029
742
return exitstatus;
1030
743
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0