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- Committer: Teddy Hogeborn
- Date: 2008-08-31 16:04:47 UTC
- mfrom: (24.1.77 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080831160447-2xte5k90onspphki
Merge.
- 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
return add_to_char_array(def, &(p->environ), &(p->envc));
132
187
}
133
188
134
189
/*
147
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
203
}
149
204
150
process *process_list = NULL;
151
205
152
/* Mark a process as completed when it exits, and save its exit
206
/* Mark processes as completed when they exit, and save their exit
153
207
status. */
154
208
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;
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
}
171
288
}
172
289
173
290
int main(int argc, char *argv[]){
174
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
291
char *plugindir = NULL;
292
char *argfile = NULL;
293
FILE *conffp;
175
294
size_t d_name_len;
176
295
DIR *dir = NULL;
177
296
struct dirent *dirst;
185
304
struct sigaction old_sigchld_action;
186
305
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
187
306
.sa_flags = SA_NOCLDSTOP };
188
char *plus_options = NULL;
189
char **plus_argv = NULL;
307
char **custom_argv = NULL;
308
int custom_argc = 0;
190
309
191
310
/* Establish a signal handler */
192
311
sigemptyset(&sigchld_action.sa_mask);
193
312
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
194
if(ret < 0){
313
if(ret == -1){
195
314
perror("sigaddset");
196
exit(EXIT_FAILURE);
315
exitstatus = EXIT_FAILURE;
316
goto fallback;
197
317
}
198
318
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
199
if(ret < 0){
319
if(ret == -1){
200
320
perror("sigaction");
201
exit(EXIT_FAILURE);
321
exitstatus = EXIT_FAILURE;
322
goto fallback;
202
323
}
203
324
204
325
/* The options we understand. */
206
327
{ .name = "global-options", .key = 'g',
207
328
.arg = "OPTION[,OPTION[,...]]",
208
329
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
331
.arg = "VAR=value",
332
.doc = "Environment variable passed to all plugins" },
209
333
{ .name = "options-for", .key = 'o',
210
334
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
211
335
.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" },
212
339
{ .name = "disable", .key = 'd',
213
340
.arg = "PLUGIN",
214
341
.doc = "Disable a specific plugin", .group = 1 },
215
342
{ .name = "plugin-dir", .key = 128,
216
343
.arg = "DIRECTORY",
217
344
.doc = "Specify a different plugin directory", .group = 2 },
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 },
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 },
226
356
{ .name = NULL }
227
357
};
228
358
229
error_t parse_opt (int key, char *arg, struct argp_state *state) {
359
error_t parse_opt (int key, char *arg, __attribute__((unused)) struct argp_state *state) {
230
360
/* Get the INPUT argument from `argp_parse', which we know is a
231
361
pointer to our plugin list pointer. */
232
plugin **plugins = state->input;
233
362
switch (key) {
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:
363
case 'g': /* --global-options */
364
if (arg != NULL){
365
char *p;
366
while((p = strsep(&arg, ",")) != NULL){
367
if(p[0] == '\0'){
368
continue;
369
}
370
if(not add_argument(getplugin(NULL), p)){
371
perror("add_argument");
372
return ARGP_ERR_UNKNOWN;
373
}
374
}
375
}
376
break;
377
case 'e': /* --global-envs */
378
if(arg == NULL){
379
break;
380
}
381
{
382
char *envdef = strdup(arg);
383
if(envdef == NULL){
384
break;
385
}
386
if(not add_environment(getplugin(NULL), envdef)){
387
perror("add_environment");
388
}
389
}
390
break;
391
case 'o': /* --options-for */
392
if (arg != NULL){
393
char *p_name = strsep(&arg, ":");
394
if(p_name[0] == '\0'){
395
break;
396
}
397
char *opt = strsep(&arg, ":");
398
if(opt[0] == '\0'){
399
break;
400
}
401
if(opt != NULL){
402
char *p;
403
while((p = strsep(&opt, ",")) != NULL){
404
if(p[0] == '\0'){
405
continue;
406
}
407
if(not add_argument(getplugin(p_name), p)){
408
perror("add_argument");
409
return ARGP_ERR_UNKNOWN;
410
}
411
}
412
}
413
}
414
break;
415
case 'f': /* --envs-for */
416
if(arg == NULL){
417
break;
418
}
419
{
420
char *envdef = strchr(arg, ':');
421
if(envdef == NULL){
422
break;
423
}
424
char *p_name = strndup(arg, (size_t) (envdef-arg));
425
if(p_name == NULL){
426
break;
427
}
428
envdef++;
429
if(not add_environment(getplugin(p_name), envdef)){
430
perror("add_environment");
431
}
432
}
433
break;
434
case 'd': /* --disable */
435
if (arg != NULL){
436
plugin *p = getplugin(arg);
437
if(p == NULL){
438
return ARGP_ERR_UNKNOWN;
439
}
440
p->disabled = true;
441
}
442
break;
443
case 128: /* --plugin-dir */
444
plugindir = strdup(arg);
445
if(plugindir == NULL){
446
perror("strdup");
447
}
448
break;
449
case 129: /* --config-file */
450
argfile = strdup(arg);
451
if(argfile == NULL){
452
perror("strdup");
453
}
454
break;
455
case 130: /* --userid */
265
456
uid = (uid_t)strtol(arg, NULL, 10);
266
457
break;
267
case 130:
458
case 131: /* --groupid */
268
459
gid = (gid_t)strtol(arg, NULL, 10);
269
460
break;
270
case 131:
461
case 132: /* --debug */
271
462
debug = true;
272
463
break;
273
464
case ARGP_KEY_ARG:
274
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
275
argp_usage (state);
276
}
277
plus_options = arg;
465
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
278
466
break;
279
467
case ARGP_KEY_END:
280
468
break;
284
472
return 0;
285
473
}
286
474
287
plugin *plugin_list = NULL;
288
289
475
struct argp argp = { .options = options, .parser = parse_opt,
290
476
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
291
477
.doc = "Mandos plugin runner -- Run plugins" };
292
478
293
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
479
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
294
480
if (ret == ARGP_ERR_UNKNOWN){
295
fprintf(stderr, "Unkown error while parsing arguments\n");
481
fprintf(stderr, "Unknown error while parsing arguments\n");
296
482
exitstatus = EXIT_FAILURE;
297
goto end;
483
goto fallback;
298
484
}
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){
485
486
/* Opens the configfile if aviable */
487
if (argfile == NULL){
488
conffp = fopen(AFILE, "r");
489
} else {
490
conffp = fopen(argfile, "r");
491
}
492
if(conffp != NULL){
493
char *org_line = NULL;
494
char *p, *arg, *new_arg, *line;
495
size_t size = 0;
496
ssize_t sret;
497
const char whitespace_delims[] = " \r\t\f\v\n";
498
const char comment_delim[] = "#";
499
500
custom_argc = 1;
501
custom_argv = malloc(sizeof(char*) * 2);
502
if(custom_argv == NULL){
310
503
perror("malloc");
311
504
exitstatus = EXIT_FAILURE;
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);
505
goto fallback;
506
}
507
custom_argv[0] = argv[0];
508
custom_argv[1] = NULL;
509
510
/* for each line in the config file, strip whitespace and ignore commented text */
511
while(true){
512
sret = getline(&org_line, &size, conffp);
513
if(sret == -1){
514
break;
515
}
516
517
line = org_line;
518
arg = strsep(&line, comment_delim);
519
while((p = strsep(&arg, whitespace_delims)) != NULL){
520
if(p[0] == '\0'){
521
continue;
522
}
523
new_arg = strdup(p);
524
if(new_arg == NULL){
525
perror("strdup");
526
exitstatus = EXIT_FAILURE;
527
free(org_line);
528
goto fallback;
529
}
530
531
custom_argc += 1;
532
custom_argv = realloc(custom_argv, sizeof(char *)
533
* ((unsigned int) custom_argc + 1));
534
if(custom_argv == NULL){
535
perror("realloc");
536
exitstatus = EXIT_FAILURE;
537
free(org_line);
538
goto fallback;
539
}
540
custom_argv[custom_argc-1] = new_arg;
541
custom_argv[custom_argc] = NULL;
542
}
543
}
544
free(org_line);
545
} else{
546
/* Check for harmful errors and go to fallback. Other errors might
547
not affect opening plugins */
548
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
549
perror("fopen");
550
exitstatus = EXIT_FAILURE;
551
goto fallback;
552
}
553
}
554
/* If there was any arguments from configuration file,
555
pass them to parser as command arguments */
556
if(custom_argv != NULL){
557
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
331
558
if (ret == ARGP_ERR_UNKNOWN){
332
fprintf(stderr, "Unkown error while parsing arguments\n");
559
fprintf(stderr, "Unknown error while parsing arguments\n");
333
560
exitstatus = EXIT_FAILURE;
334
goto end;
561
goto fallback;
335
562
}
336
563
}
337
564
342
569
for(char **a = p->argv; *a != NULL; a++){
343
570
fprintf(stderr, "\tArg: %s\n", *a);
344
571
}
572
fprintf(stderr, "...and %u environment variables\n", p->envc);
573
for(char **a = p->environ; *a != NULL; a++){
574
fprintf(stderr, "\t%s\n", *a);
575
}
345
576
}
346
577
}
347
578
579
/* Strip permissions down to nobody */
348
580
ret = setuid(uid);
349
581
if (ret == -1){
350
582
perror("setuid");
351
}
352
583
}
353
584
setgid(gid);
354
585
if (ret == -1){
355
586
perror("setgid");
356
587
}
588
589
if (plugindir == NULL){
590
dir = opendir(PDIR);
591
} else {
592
dir = opendir(plugindir);
593
}
357
594
358
dir = opendir(plugindir);
359
595
if(dir == NULL){
360
596
perror("Could not open plugin dir");
361
597
exitstatus = EXIT_FAILURE;
362
goto end;
598
goto fallback;
363
599
}
364
600
365
601
/* Set the FD_CLOEXEC flag on the directory, if possible */
370
606
if(ret < 0){
371
607
perror("set_cloexec_flag");
372
608
exitstatus = EXIT_FAILURE;
373
goto end;
609
goto fallback;
374
610
}
375
611
}
376
612
}
377
613
378
614
FD_ZERO(&rfds_all);
379
615
616
/* Read and execute any executable in the plugin directory*/
380
617
while(true){
381
618
dirst = readdir(dir);
382
619
385
622
if (errno == EBADF){
386
623
perror("readdir");
387
624
exitstatus = EXIT_FAILURE;
388
goto end;
625
goto fallback;
389
626
}
390
627
break;
391
628
}
413
650
break;
414
651
}
415
652
}
416
417
653
if(bad_name){
418
654
continue;
419
655
}
420
421
656
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
422
657
size_t suf_len = strlen(*suf);
423
658
if((d_name_len >= suf_len)
436
671
continue;
437
672
}
438
673
}
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;
674
675
char *filename;
676
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
677
if(ret < 0){
678
perror("asprintf");
679
continue;
445
680
}
446
strcpy(filename, plugindir); /* Spurious warning */
447
strcat(filename, "/"); /* Spurious warning */
448
strcat(filename, dirst->d_name); /* Spurious warning */
449
681
450
682
ret = stat(filename, &st);
451
683
if (ret == -1){
452
684
perror("stat");
453
exitstatus = EXIT_FAILURE;
454
goto end;
685
free(filename);
686
continue;
455
687
}
456
688
689
/* Ignore non-executable files */
457
690
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
458
691
if(debug){
459
692
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
462
695
free(filename);
463
696
continue;
464
697
}
465
if(getplugin(dirst->d_name, &plugin_list)->disabled){
698
699
plugin *p = getplugin(dirst->d_name);
700
if(p == NULL){
701
perror("getplugin");
702
free(filename);
703
continue;
704
}
705
if(p->disabled){
466
706
if(debug){
467
707
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
468
708
dirst->d_name);
470
710
free(filename);
471
711
continue;
472
712
}
473
plugin *p = getplugin(dirst->d_name, &plugin_list);
474
713
{
475
714
/* Add global arguments to argument list for this plugin */
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];
715
plugin *g = getplugin(NULL);
716
if(g != NULL){
717
for(char **a = g->argv + 1; *a != NULL; a++){
718
if(not add_argument(p, *a)){
719
perror("add_argument");
720
}
721
}
722
/* Add global environment variables */
723
for(char **e = g->environ; *e != NULL; e++){
724
if(not add_environment(p, *e)){
725
perror("add_environment");
726
}
727
}
728
}
729
}
730
/* If this plugin has any environment variables, we will call
731
using execve and need to duplicate the environment from this
732
process, too. */
733
if(p->environ[0] != NULL){
734
for(char **e = environ; *e != NULL; e++){
735
char *copy = strdup(*e);
736
if(copy == NULL){
737
perror("strdup");
738
continue;
739
}
740
if(not add_environment(p, copy)){
741
perror("add_environment");
742
}
743
}
744
}
745
746
int pipefd[2];
482
747
ret = pipe(pipefd);
483
748
if (ret == -1){
484
749
perror("pipe");
485
750
exitstatus = EXIT_FAILURE;
486
goto end;
751
goto fallback;
487
752
}
753
/* Ask OS to automatic close the pipe on exec */
488
754
ret = set_cloexec_flag(pipefd[0]);
489
755
if(ret < 0){
490
756
perror("set_cloexec_flag");
491
757
exitstatus = EXIT_FAILURE;
492
goto end;
758
goto fallback;
493
759
}
494
760
ret = set_cloexec_flag(pipefd[1]);
495
761
if(ret < 0){
496
762
perror("set_cloexec_flag");
497
763
exitstatus = EXIT_FAILURE;
498
goto end;
764
goto fallback;
499
765
}
500
766
/* Block SIGCHLD until process is safely in process list */
501
767
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
502
768
if(ret < 0){
503
769
perror("sigprocmask");
504
770
exitstatus = EXIT_FAILURE;
505
goto end;
771
goto fallback;
506
772
}
507
773
// Starting a new process to be watched
508
774
pid_t pid = fork();
775
if(pid == -1){
776
perror("fork");
777
exitstatus = EXIT_FAILURE;
778
goto fallback;
779
}
509
780
if(pid == 0){
510
781
/* this is the child process */
511
782
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
530
801
above and must now close it manually here. */
531
802
closedir(dir);
532
803
}
533
if(execv(filename, p->argv) < 0){
534
perror("execv");
535
_exit(EXIT_FAILURE);
804
if(p->environ[0] == NULL){
805
if(execv(filename, p->argv) < 0){
806
perror("execv");
807
_exit(EXIT_FAILURE);
808
}
809
} else {
810
if(execve(filename, p->argv, p->environ) < 0){
811
perror("execve");
812
_exit(EXIT_FAILURE);
813
}
536
814
}
537
815
/* no return */
538
816
}
539
/* parent process */
817
/* Parent process */
818
close(pipefd[1]); /* Close unused write end of pipe */
540
819
free(filename);
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");
820
plugin *new_plugin = getplugin(dirst->d_name);
821
if (new_plugin == NULL){
822
perror("getplugin");
545
823
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
546
824
if(ret < 0){
547
perror("sigprocmask");
825
perror("sigprocmask");
548
826
}
549
827
exitstatus = EXIT_FAILURE;
550
goto end;
828
goto fallback;
551
829
}
552
830
553
*new_process = (struct process){ .pid = pid,
554
.fd = pipefd[0],
555
.next = process_list };
556
// List handling
557
process_list = new_process;
831
new_plugin->pid = pid;
832
new_plugin->fd = pipefd[0];
833
558
834
/* Unblock SIGCHLD so signal handler can be run if this process
559
835
has already completed */
560
836
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
561
837
if(ret < 0){
562
838
perror("sigprocmask");
563
839
exitstatus = EXIT_FAILURE;
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);
840
goto fallback;
841
}
842
843
FD_SET(new_plugin->fd, &rfds_all);
844
845
if (maxfd < new_plugin->fd){
846
maxfd = new_plugin->fd;
847
}
848
580
849
}
581
850
582
851
closedir(dir);
583
852
dir = NULL;
584
585
if (process_list == NULL){
586
fprintf(stderr, "No plugin processes started, exiting\n");
587
exitstatus = EXIT_FAILURE;
588
goto end;
853
854
for(plugin *p = plugin_list; p != NULL; p = p->next){
855
if(p->pid != 0){
856
break;
857
}
858
if(p->next == NULL){
859
fprintf(stderr, "No plugin processes started. Incorrect plugin"
860
" directory?\n");
861
free_plugin_list();
862
}
589
863
}
590
while(process_list){
864
865
/* Main loop while running plugins exist */
866
while(plugin_list){
591
867
fd_set rfds = rfds_all;
592
868
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
593
869
if (select_ret == -1){
594
870
perror("select");
595
871
exitstatus = EXIT_FAILURE;
596
goto end;
872
goto fallback;
597
873
}
598
874
/* OK, now either a process completed, or something can be read
599
875
from one of them */
600
for(process *proc = process_list; proc ; proc = proc->next){
876
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
601
877
/* Is this process completely done? */
602
878
if(proc->eof and proc->completed){
603
879
/* Only accept the plugin output if it exited cleanly */
604
880
if(not WIFEXITED(proc->status)
605
881
or WEXITSTATUS(proc->status) != 0){
606
882
/* Bad exit by plugin */
883
607
884
if(debug){
608
885
if(WIFEXITED(proc->status)){
609
fprintf(stderr, "Plugin %d exited with status %d\n",
610
proc->pid, WEXITSTATUS(proc->status));
886
fprintf(stderr, "Plugin %u exited with status %d\n",
887
(unsigned int) (proc->pid),
888
WEXITSTATUS(proc->status));
611
889
} else if(WIFSIGNALED(proc->status)) {
612
fprintf(stderr, "Plugin %d killed by signal %d\n",
613
proc->pid, WTERMSIG(proc->status));
890
fprintf(stderr, "Plugin %u killed by signal %d\n",
891
(unsigned int) (proc->pid),
892
WTERMSIG(proc->status));
614
893
} else if(WCOREDUMP(proc->status)){
615
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
894
fprintf(stderr, "Plugin %d dumped core\n",
895
(unsigned int) (proc->pid));
616
896
}
617
897
}
898
618
899
/* Remove the plugin */
619
900
FD_CLR(proc->fd, &rfds_all);
901
620
902
/* Block signal while modifying process_list */
621
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
903
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
622
904
if(ret < 0){
623
905
perror("sigprocmask");
624
906
exitstatus = EXIT_FAILURE;
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
}
907
goto fallback;
908
}
909
free_plugin(proc);
640
910
/* We are done modifying process list, so unblock signal */
641
911
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
642
912
NULL);
643
913
if(ret < 0){
644
914
perror("sigprocmask");
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;
915
exitstatus = EXIT_FAILURE;
916
goto fallback;
917
}
918
919
if(plugin_list == NULL){
920
break;
921
}
922
continue;
652
923
}
924
653
925
/* This process exited nicely, so print its buffer */
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
}
926
927
bool bret = print_out_password(proc->buffer,
928
proc->buffer_length);
929
if(not bret){
930
perror("print_out_password");
931
exitstatus = EXIT_FAILURE;
665
932
}
666
goto end;
933
goto fallback;
667
934
}
935
668
936
/* This process has not completed. Does it have any output? */
669
937
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
670
938
/* This process had nothing to say at this time */
677
945
if (proc->buffer == NULL){
678
946
perror("malloc");
679
947
exitstatus = EXIT_FAILURE;
680
goto end;
948
goto fallback;
681
949
}
682
950
proc->buffer_size += BUFFER_SIZE;
683
951
}
696
964
}
697
965
}
698
966
}
699
if(process_list == NULL){
700
fprintf(stderr, "All plugin processes failed, exiting\n");
701
exitstatus = EXIT_FAILURE;
967
968
969
fallback:
970
971
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
972
/* Fallback if all plugins failed, none are found or an error
973
occured */
974
bool bret;
975
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
976
char *passwordbuffer = getpass("Password: ");
977
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
978
if(not bret){
979
perror("print_out_password");
980
exitstatus = EXIT_FAILURE;
981
}
702
982
}
703
983
704
end:
705
984
/* Restore old signal handler */
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);
985
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
986
if(ret == -1){
987
perror("sigaction");
988
exitstatus = EXIT_FAILURE;
989
}
990
991
if(custom_argv != NULL){
992
for(char **arg = custom_argv+1; *arg != NULL; arg++){
993
free(*arg);
994
}
995
free(custom_argv);
715
996
}
716
997
717
998
if(dir != NULL){
719
1000
}
720
1001
721
1002
/* Free the process list and kill the processes */
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");
1003
for(plugin *p = plugin_list; p != NULL; p = p->next){
1004
if(p->pid != 0){
1005
close(p->fd);
1006
ret = kill(p->pid, SIGTERM);
1007
if(ret == -1 and errno != ESRCH){
1008
/* Set-uid proccesses might not get closed */
1009
perror("kill");
1010
}
729
1011
}
730
free(process_list->buffer);
731
free(process_list);
732
1012
}
733
1013
734
1014
/* Wait for any remaining child processes to terminate */
738
1018
if(errno != ECHILD){
739
1019
perror("wait");
740
1020
}
1021
1022
free_plugin_list();
1023
1024
free(plugindir);
1025
free(argfile);
741
1026
742
1027
return exitstatus;
743
1028
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0