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- Committer: Teddy Hogeborn
- Date: 2008-09-01 08:29:23 UTC
- Revision ID: teddy@fukt.bsnet.se-20080901082923-i2liq6t7warmu9xe
* mandos.xml: Enclose "RAM" with <acronym>.
* overview.xml: - '' -
* plugin-runner.xml (DESCRIPTION): Improved wording.
(PURPOSE): New section.
(OPTIONS): Improved wording.
(OVERVIEW, PLUGINS): New section.
(FALLBACK): New empty placeholder section.
* plugins.d/password-prompt.xml: Enclose "RAM" with <acronym>.
* overview.xml: - '' -
* plugin-runner.xml (DESCRIPTION): Improved wording.
(PURPOSE): New section.
(OPTIONS): Improved wording.
(OVERVIEW, PLUGINS): New section.
(FALLBACK): New empty placeholder section.
* plugins.d/password-prompt.xml: Enclose "RAM" with <acronym>.
- 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> /* strsep, 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,
65
65
#include <errno.h> /* errno, EBADF */
66
66
67
67
#define BUFFER_SIZE 256
68
#define CONFFILE "/conf/conf.d/mandos/client.conf"
69
70
const char *argp_program_version = "mandos-client 1.0";
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";
71
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
74
73
struct process;
74
75
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*/
76
86
pid_t pid;
77
87
int fd;
78
88
char *buffer;
79
89
size_t buffer_size;
80
90
size_t buffer_length;
81
91
bool eof;
82
bool completed;
83
int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
bool disabled;
92
volatile bool completed;
93
volatile int status;
92
94
struct plugin *next;
93
95
} plugin;
94
96
95
static plugin *getplugin(char *name, plugin **plugin_list){
96
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){
97
104
if ((p->name == name)
98
105
or (p->name and name and (strcmp(p->name, name) == 0))){
99
106
return p;
102
109
/* Create a new plugin */
103
110
plugin *new_plugin = malloc(sizeof(plugin));
104
111
if (new_plugin == NULL){
105
perror("malloc");
106
exit(EXIT_FAILURE);
107
}
108
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
109
127
new_plugin->argv = malloc(sizeof(char *) * 2);
110
128
if (new_plugin->argv == NULL){
111
perror("malloc");
112
exit(EXIT_FAILURE);
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
113
132
}
114
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
115
134
new_plugin->argv[1] = NULL;
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
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
119
145
/* Append the new plugin to the list */
120
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
121
147
return new_plugin;
122
148
}
123
149
124
static void addargument(plugin *p, char *arg){
125
p->argv[p->argc] = arg;
126
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
127
if (p->argv == NULL){
128
perror("malloc");
129
exit(EXIT_FAILURE);
130
}
131
p->argc++;
132
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));
133
187
}
134
188
135
189
/*
148
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
149
203
}
150
204
151
process *process_list = NULL;
152
205
153
/* Mark a process as completed when it exits, and save its exit
206
/* Mark processes as completed when they exit, and save their exit
154
207
status. */
155
208
void handle_sigchld(__attribute__((unused)) int sig){
156
process *proc = process_list;
157
int status;
158
pid_t pid = wait(&status);
159
if(pid == -1){
160
perror("wait");
161
return;
162
}
163
while(proc != NULL and proc->pid != pid){
164
proc = proc->next;
165
}
166
if(proc == NULL){
167
/* Process not found in process list */
168
return;
169
}
170
proc->status = status;
171
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
}
172
236
}
173
237
238
/* Prints out a password to stdout */
174
239
bool print_out_password(const char *buffer, size_t length){
175
240
ssize_t ret;
176
241
if(length>0 and buffer[length-1] == '\n'){
186
251
return true;
187
252
}
188
253
189
char ** addcustomargument(char **argv, int *argc, char *arg){
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);
190
266
191
if (argv == NULL){
192
*argc = 1;
193
argv = malloc(sizeof(char*) * 2);
194
if(argv == NULL){
195
return NULL;
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
}
196
278
}
197
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
198
argv[1] = NULL;
199
}
200
*argc += 1;
201
argv = realloc(argv, sizeof(char *)
202
* ((unsigned int) *argc + 1));
203
if(argv == NULL){
204
return NULL;
205
}
206
argv[*argc-1] = arg;
207
argv[*argc] = NULL;
208
return argv;
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
}
209
288
}
210
289
211
290
int main(int argc, char *argv[]){
212
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
213
const char *conffile = CONFFILE;
291
char *plugindir = NULL;
292
char *argfile = NULL;
214
293
FILE *conffp;
215
294
size_t d_name_len;
216
295
DIR *dir = NULL;
231
310
/* Establish a signal handler */
232
311
sigemptyset(&sigchld_action.sa_mask);
233
312
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
234
if(ret < 0){
313
if(ret == -1){
235
314
perror("sigaddset");
236
exit(EXIT_FAILURE);
315
exitstatus = EXIT_FAILURE;
316
goto fallback;
237
317
}
238
318
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
239
if(ret < 0){
319
if(ret == -1){
240
320
perror("sigaction");
241
exit(EXIT_FAILURE);
321
exitstatus = EXIT_FAILURE;
322
goto fallback;
242
323
}
243
324
244
325
/* The options we understand. */
246
327
{ .name = "global-options", .key = 'g',
247
328
.arg = "OPTION[,OPTION[,...]]",
248
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" },
249
333
{ .name = "options-for", .key = 'o',
250
334
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
251
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" },
252
339
{ .name = "disable", .key = 'd',
253
340
.arg = "PLUGIN",
254
341
.doc = "Disable a specific plugin", .group = 1 },
255
342
{ .name = "plugin-dir", .key = 128,
256
343
.arg = "DIRECTORY",
257
344
.doc = "Specify a different plugin directory", .group = 2 },
258
{ .name = "userid", .key = 129,
259
.arg = "ID", .flags = 0,
260
.doc = "User ID the plugins will run as", .group = 2 },
261
{ .name = "groupid", .key = 130,
262
.arg = "ID", .flags = 0,
263
.doc = "Group ID the plugins will run as", .group = 2 },
264
{ .name = "debug", .key = 131,
265
.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 },
266
356
{ .name = NULL }
267
357
};
268
358
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
359
error_t parse_opt (int key, char *arg, __attribute__((unused))
360
struct argp_state *state) {
270
361
/* Get the INPUT argument from `argp_parse', which we know is a
271
362
pointer to our plugin list pointer. */
272
plugin **plugins = state->input;
273
363
switch (key) {
274
case 'g':
364
case 'g': /* --global-options */
275
365
if (arg != NULL){
276
366
char *p;
277
367
while((p = strsep(&arg, ",")) != NULL){
278
368
if(p[0] == '\0'){
279
369
continue;
280
370
}
281
addargument(getplugin(NULL, plugins), p);
282
}
283
}
284
break;
285
case 'o':
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 */
286
393
if (arg != NULL){
287
char *name = strsep(&arg, ":");
288
if(name[0] == '\0'){
394
char *p_name = strsep(&arg, ":");
395
if(p_name[0] == '\0'){
289
396
break;
290
397
}
291
398
char *opt = strsep(&arg, ":");
298
405
if(p[0] == '\0'){
299
406
continue;
300
407
}
301
addargument(getplugin(name, plugins), p);
408
if(not add_argument(getplugin(p_name), p)){
409
perror("add_argument");
410
return ARGP_ERR_UNKNOWN;
411
}
302
412
}
303
413
}
304
414
}
305
415
break;
306
case 'd':
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 */
307
436
if (arg != NULL){
308
getplugin(arg, plugins)->disabled = true;
309
}
310
break;
311
case 128:
312
plugindir = arg;
313
break;
314
case 129:
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 */
315
457
uid = (uid_t)strtol(arg, NULL, 10);
316
458
break;
317
case 130:
459
case 131: /* --groupid */
318
460
gid = (gid_t)strtol(arg, NULL, 10);
319
461
break;
320
case 131:
462
case 132: /* --debug */
321
463
debug = true;
322
464
break;
323
465
case ARGP_KEY_ARG:
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
466
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
325
467
break;
326
468
case ARGP_KEY_END:
327
469
break;
331
473
return 0;
332
474
}
333
475
334
plugin *plugin_list = NULL;
335
336
476
struct argp argp = { .options = options, .parser = parse_opt,
337
477
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
338
478
.doc = "Mandos plugin runner -- Run plugins" };
339
479
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
480
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
341
481
if (ret == ARGP_ERR_UNKNOWN){
342
482
fprintf(stderr, "Unknown error while parsing arguments\n");
343
483
exitstatus = EXIT_FAILURE;
344
goto end;
484
goto fallback;
345
485
}
346
486
347
conffp = fopen(conffile, "r");
487
/* Opens the configfile if aviable */
488
if (argfile == NULL){
489
conffp = fopen(AFILE, "r");
490
} else {
491
conffp = fopen(argfile, "r");
492
}
348
493
if(conffp != NULL){
349
494
char *org_line = NULL;
495
char *p, *arg, *new_arg, *line;
350
496
size_t size = 0;
351
497
ssize_t sret;
352
char *p, *arg, *new_arg, *line;
353
498
const char whitespace_delims[] = " \r\t\f\v\n";
354
499
const char comment_delim[] = "#";
355
500
501
custom_argc = 1;
502
custom_argv = malloc(sizeof(char*) * 2);
503
if(custom_argv == NULL){
504
perror("malloc");
505
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 */
356
513
while(true){
357
514
sret = getline(&org_line, &size, conffp);
358
515
if(sret == -1){
366
523
continue;
367
524
}
368
525
new_arg = strdup(p);
369
custom_argv = addcustomargument(custom_argv, &custom_argc, new_arg);
370
if (custom_argv == NULL){
371
perror("addcustomargument");
372
exitstatus = EXIT_FAILURE;
373
goto end;
374
}
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;
375
544
}
376
545
}
377
546
free(org_line);
378
547
} else{
379
/* check for harmfull errors */
548
/* Check for harmful errors and go to fallback. Other errors might
549
not affect opening plugins */
380
550
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
381
551
perror("fopen");
382
552
exitstatus = EXIT_FAILURE;
383
goto end;
553
goto fallback;
384
554
}
385
555
}
386
556
/* If there was any arguments from configuration file,
557
pass them to parser as command arguments */
387
558
if(custom_argv != NULL){
388
custom_argv[0] = argv[0];
389
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
559
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
390
560
if (ret == ARGP_ERR_UNKNOWN){
391
561
fprintf(stderr, "Unknown error while parsing arguments\n");
392
562
exitstatus = EXIT_FAILURE;
393
goto end;
563
goto fallback;
394
564
}
395
565
}
396
566
401
571
for(char **a = p->argv; *a != NULL; a++){
402
572
fprintf(stderr, "\tArg: %s\n", *a);
403
573
}
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
}
404
578
}
405
579
}
406
580
581
/* Strip permissions down to nobody */
407
582
ret = setuid(uid);
408
583
if (ret == -1){
409
584
perror("setuid");
410
}
411
585
}
412
586
setgid(gid);
413
587
if (ret == -1){
414
588
perror("setgid");
415
589
}
590
591
if (plugindir == NULL){
592
dir = opendir(PDIR);
593
} else {
594
dir = opendir(plugindir);
595
}
416
596
417
dir = opendir(plugindir);
418
597
if(dir == NULL){
419
598
perror("Could not open plugin dir");
420
599
exitstatus = EXIT_FAILURE;
421
goto end;
600
goto fallback;
422
601
}
423
602
424
603
/* Set the FD_CLOEXEC flag on the directory, if possible */
429
608
if(ret < 0){
430
609
perror("set_cloexec_flag");
431
610
exitstatus = EXIT_FAILURE;
432
goto end;
611
goto fallback;
433
612
}
434
613
}
435
614
}
436
615
437
616
FD_ZERO(&rfds_all);
438
617
618
/* Read and execute any executable in the plugin directory*/
439
619
while(true){
440
620
dirst = readdir(dir);
441
621
444
624
if (errno == EBADF){
445
625
perror("readdir");
446
626
exitstatus = EXIT_FAILURE;
447
goto end;
627
goto fallback;
448
628
}
449
629
break;
450
630
}
472
652
break;
473
653
}
474
654
}
475
476
655
if(bad_name){
477
656
continue;
478
657
}
479
480
658
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
481
659
size_t suf_len = strlen(*suf);
482
660
if((d_name_len >= suf_len)
495
673
continue;
496
674
}
497
675
}
498
499
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
500
if (filename == NULL){
501
perror("malloc");
676
677
char *filename;
678
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
679
if(ret < 0){
680
perror("asprintf");
502
681
continue;
503
682
}
504
strcpy(filename, plugindir); /* Spurious warning */
505
strcat(filename, "/"); /* Spurious warning */
506
strcat(filename, dirst->d_name); /* Spurious warning */
507
683
508
684
ret = stat(filename, &st);
509
685
if (ret == -1){
511
687
free(filename);
512
688
continue;
513
689
}
514
690
691
/* Ignore non-executable files */
515
692
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
516
693
if(debug){
517
694
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
520
697
free(filename);
521
698
continue;
522
699
}
523
if(getplugin(dirst->d_name, &plugin_list)->disabled){
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){
524
708
if(debug){
525
709
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
526
710
dirst->d_name);
528
712
free(filename);
529
713
continue;
530
714
}
531
plugin *p = getplugin(dirst->d_name, &plugin_list);
532
715
{
533
716
/* Add global arguments to argument list for this plugin */
534
plugin *g = getplugin(NULL, &plugin_list);
535
for(char **a = g->argv + 1; *a != NULL; a++){
536
addargument(p, *a);
537
}
538
}
539
int pipefd[2];
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];
540
749
ret = pipe(pipefd);
541
750
if (ret == -1){
542
751
perror("pipe");
543
752
exitstatus = EXIT_FAILURE;
544
goto end;
753
goto fallback;
545
754
}
755
/* Ask OS to automatic close the pipe on exec */
546
756
ret = set_cloexec_flag(pipefd[0]);
547
757
if(ret < 0){
548
758
perror("set_cloexec_flag");
549
759
exitstatus = EXIT_FAILURE;
550
goto end;
760
goto fallback;
551
761
}
552
762
ret = set_cloexec_flag(pipefd[1]);
553
763
if(ret < 0){
554
764
perror("set_cloexec_flag");
555
765
exitstatus = EXIT_FAILURE;
556
goto end;
766
goto fallback;
557
767
}
558
768
/* Block SIGCHLD until process is safely in process list */
559
769
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
560
770
if(ret < 0){
561
771
perror("sigprocmask");
562
772
exitstatus = EXIT_FAILURE;
563
goto end;
773
goto fallback;
564
774
}
565
775
// Starting a new process to be watched
566
776
pid_t pid = fork();
567
777
if(pid == -1){
568
778
perror("fork");
569
779
exitstatus = EXIT_FAILURE;
570
goto end;
780
goto fallback;
571
781
}
572
782
if(pid == 0){
573
783
/* this is the child process */
593
803
above and must now close it manually here. */
594
804
closedir(dir);
595
805
}
596
if(execv(filename, p->argv) < 0){
597
perror("execv");
598
_exit(EXIT_FAILURE);
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
}
599
816
}
600
817
/* no return */
601
818
}
602
/* parent process */
819
/* Parent process */
820
close(pipefd[1]); /* Close unused write end of pipe */
603
821
free(filename);
604
close(pipefd[1]); /* close unused write end of pipe */
605
process *new_process = malloc(sizeof(process));
606
if (new_process == NULL){
607
perror("malloc");
822
plugin *new_plugin = getplugin(dirst->d_name);
823
if (new_plugin == NULL){
824
perror("getplugin");
608
825
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
609
826
if(ret < 0){
610
perror("sigprocmask");
827
perror("sigprocmask");
611
828
}
612
829
exitstatus = EXIT_FAILURE;
613
goto end;
830
goto fallback;
614
831
}
615
832
616
*new_process = (struct process){ .pid = pid,
617
.fd = pipefd[0],
618
.next = process_list };
619
// List handling
620
process_list = new_process;
833
new_plugin->pid = pid;
834
new_plugin->fd = pipefd[0];
835
621
836
/* Unblock SIGCHLD so signal handler can be run if this process
622
837
has already completed */
623
838
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
624
839
if(ret < 0){
625
840
perror("sigprocmask");
626
841
exitstatus = EXIT_FAILURE;
627
goto end;
628
}
629
630
FD_SET(new_process->fd, &rfds_all);
631
632
if (maxfd < new_process->fd){
633
maxfd = new_process->fd;
634
}
635
636
}
637
638
/* Free the plugin list */
639
for(plugin *next; plugin_list != NULL; plugin_list = next){
640
next = plugin_list->next;
641
free(plugin_list->argv);
642
free(plugin_list);
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
643
851
}
644
852
645
853
closedir(dir);
646
854
dir = NULL;
647
648
if (process_list == NULL){
649
fprintf(stderr, "No plugin processes started. Incorrect plugin"
650
" directory?\n");
651
process_list = 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
}
652
865
}
653
while(process_list){
866
867
/* Main loop while running plugins exist */
868
while(plugin_list){
654
869
fd_set rfds = rfds_all;
655
870
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
656
871
if (select_ret == -1){
657
872
perror("select");
658
873
exitstatus = EXIT_FAILURE;
659
goto end;
874
goto fallback;
660
875
}
661
876
/* OK, now either a process completed, or something can be read
662
877
from one of them */
663
for(process *proc = process_list; proc ; proc = proc->next){
878
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
664
879
/* Is this process completely done? */
665
880
if(proc->eof and proc->completed){
666
881
/* Only accept the plugin output if it exited cleanly */
667
882
if(not WIFEXITED(proc->status)
668
883
or WEXITSTATUS(proc->status) != 0){
669
884
/* Bad exit by plugin */
885
670
886
if(debug){
671
887
if(WIFEXITED(proc->status)){
672
888
fprintf(stderr, "Plugin %u exited with status %d\n",
681
897
(unsigned int) (proc->pid));
682
898
}
683
899
}
900
684
901
/* Remove the plugin */
685
902
FD_CLR(proc->fd, &rfds_all);
903
686
904
/* Block signal while modifying process_list */
687
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
905
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
688
906
if(ret < 0){
689
907
perror("sigprocmask");
690
908
exitstatus = EXIT_FAILURE;
691
goto end;
692
}
693
/* Delete this process entry from the list */
694
if(process_list == proc){
695
/* First one - simple */
696
process_list = proc->next;
697
} else {
698
/* Second one or later */
699
for(process *p = process_list; p != NULL; p = p->next){
700
if(p->next == proc){
701
p->next = proc->next;
702
break;
703
}
704
}
705
}
909
goto fallback;
910
}
911
free_plugin(proc);
706
912
/* We are done modifying process list, so unblock signal */
707
913
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
708
914
NULL);
709
915
if(ret < 0){
710
916
perror("sigprocmask");
711
}
712
free(proc->buffer);
713
free(proc);
714
/* We deleted this process from the list, so we can't go
715
proc->next. Therefore, start over from the beginning of
716
the process list */
717
break;
917
exitstatus = EXIT_FAILURE;
918
goto fallback;
919
}
920
921
if(plugin_list == NULL){
922
break;
923
}
924
continue;
718
925
}
926
719
927
/* This process exited nicely, so print its buffer */
720
928
721
bool bret = print_out_password(proc->buffer, proc->buffer_length);
929
bool bret = print_out_password(proc->buffer,
930
proc->buffer_length);
722
931
if(not bret){
723
932
perror("print_out_password");
724
933
exitstatus = EXIT_FAILURE;
725
934
}
726
goto end;
935
goto fallback;
727
936
}
937
728
938
/* This process has not completed. Does it have any output? */
729
939
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
730
940
/* This process had nothing to say at this time */
737
947
if (proc->buffer == NULL){
738
948
perror("malloc");
739
949
exitstatus = EXIT_FAILURE;
740
goto end;
950
goto fallback;
741
951
}
742
952
proc->buffer_size += BUFFER_SIZE;
743
953
}
758
968
}
759
969
760
970
761
end:
971
fallback:
762
972
763
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
764
/* Fallback if all plugins failed, none are found or an error occured */
973
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
974
/* Fallback if all plugins failed, none are found or an error
975
occured */
765
976
bool bret;
766
977
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
767
978
char *passwordbuffer = getpass("Password: ");
769
980
if(not bret){
770
981
perror("print_out_password");
771
982
exitstatus = EXIT_FAILURE;
772
goto end;
773
983
}
774
984
}
775
985
776
986
/* Restore old signal handler */
777
sigaction(SIGCHLD, &old_sigchld_action, NULL);
778
779
free(custom_argv);
780
781
/* Free the plugin list */
782
for(plugin *next; plugin_list != NULL; plugin_list = next){
783
next = plugin_list->next;
784
free(plugin_list->argv);
785
free(plugin_list);
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);
786
998
}
787
999
788
1000
if(dir != NULL){
790
1002
}
791
1003
792
1004
/* Free the process list and kill the processes */
793
for(process *next; process_list != NULL; process_list = next){
794
next = process_list->next;
795
close(process_list->fd);
796
ret = kill(process_list->pid, SIGTERM);
797
if(ret == -1 and errno != ESRCH){
798
/* set-uid proccesses migth not get closed */
799
perror("kill");
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
}
800
1013
}
801
free(process_list->buffer);
802
free(process_list);
803
1014
}
804
1015
805
1016
/* Wait for any remaining child processes to terminate */
809
1020
if(errno != ECHILD){
810
1021
perror("wait");
811
1022
}
1023
1024
free_plugin_list();
1025
1026
free(plugindir);
1027
free(argfile);
812
1028
813
1029
return exitstatus;
814
1030
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0