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- Committer: Björn Påhlsson
- Date: 2008-08-10 19:14:12 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 63.
- Revision ID: belorn@braxen-20080810191412-0c8xxvnh5nalhdfq
updated mandos-client sections and added see also stuff
- 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";
69
const char *argp_program_version = "mandos-client 1.0";
73
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
71
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*/
72
struct process;
73
74
typedef struct process{
86
75
pid_t pid;
87
76
int fd;
88
77
char *buffer;
89
78
size_t buffer_size;
90
79
size_t buffer_length;
91
80
bool eof;
92
volatile bool completed;
93
volatile int status;
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;
94
91
struct plugin *next;
95
92
} plugin;
96
93
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){
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
104
96
if ((p->name == name)
105
97
or (p->name and name and (strcmp(p->name, name) == 0))){
106
98
return p;
109
101
/* Create a new plugin */
110
102
plugin *new_plugin = malloc(sizeof(plugin));
111
103
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
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
127
108
new_plugin->argv = malloc(sizeof(char *) * 2);
128
109
if (new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
110
perror("malloc");
111
exit(EXIT_FAILURE);
132
112
}
133
new_plugin->argv[0] = copy_name;
113
new_plugin->argv[0] = name;
134
114
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
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
145
118
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
147
120
return new_plugin;
148
121
}
149
122
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));
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;
187
132
}
188
133
189
134
/*
202
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
203
148
}
204
149
150
process *process_list = NULL;
205
151
206
/* Mark processes as completed when they exit, and save their exit
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)) struct argp_state *state) {
229
error_t parse_opt (int key, char *arg, struct argp_state *state) {
360
230
/* Get the INPUT argument from `argp_parse', which we know is a
361
231
pointer to our plugin list pointer. */
232
plugin **plugins = state->input;
362
233
switch (key) {
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 */
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:
456
265
uid = (uid_t)strtol(arg, NULL, 10);
457
266
break;
458
case 131: /* --groupid */
267
case 130:
459
268
gid = (gid_t)strtol(arg, NULL, 10);
460
269
break;
461
case 132: /* --debug */
270
case 131:
462
271
debug = true;
463
272
break;
464
273
case ARGP_KEY_ARG:
465
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;
466
278
break;
467
279
case ARGP_KEY_END:
468
280
break;
472
284
return 0;
473
285
}
474
286
287
plugin *plugin_list = NULL;
288
475
289
struct argp argp = { .options = options, .parser = parse_opt,
476
290
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
477
291
.doc = "Mandos plugin runner -- Run plugins" };
478
292
479
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
293
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
480
294
if (ret == ARGP_ERR_UNKNOWN){
481
fprintf(stderr, "Unknown error while parsing arguments\n");
295
fprintf(stderr, "Unkown error while parsing arguments\n");
482
296
exitstatus = EXIT_FAILURE;
483
goto fallback;
297
goto end;
484
298
}
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){
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){
503
310
perror("malloc");
504
311
exitstatus = EXIT_FAILURE;
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);
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);
558
331
if (ret == ARGP_ERR_UNKNOWN){
559
fprintf(stderr, "Unknown error while parsing arguments\n");
332
fprintf(stderr, "Unkown error while parsing arguments\n");
560
333
exitstatus = EXIT_FAILURE;
561
goto fallback;
334
goto end;
562
335
}
563
336
}
564
337
569
342
for(char **a = p->argv; *a != NULL; a++){
570
343
fprintf(stderr, "\tArg: %s\n", *a);
571
344
}
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
}
576
345
}
577
346
}
578
579
/* Strip permissions down to nobody */
347
580
348
ret = setuid(uid);
581
349
if (ret == -1){
582
350
perror("setuid");
583
}
351
}
352
584
353
setgid(gid);
585
354
if (ret == -1){
586
355
perror("setgid");
587
356
}
588
589
if (plugindir == NULL){
590
dir = opendir(PDIR);
591
} else {
592
dir = opendir(plugindir);
593
}
594
357
358
dir = opendir(plugindir);
595
359
if(dir == NULL){
596
360
perror("Could not open plugin dir");
597
361
exitstatus = EXIT_FAILURE;
598
goto fallback;
362
goto end;
599
363
}
600
364
601
365
/* Set the FD_CLOEXEC flag on the directory, if possible */
606
370
if(ret < 0){
607
371
perror("set_cloexec_flag");
608
372
exitstatus = EXIT_FAILURE;
609
goto fallback;
373
goto end;
610
374
}
611
375
}
612
376
}
613
377
614
378
FD_ZERO(&rfds_all);
615
616
/* Read and execute any executable in the plugin directory*/
379
617
380
while(true){
618
381
dirst = readdir(dir);
619
382
622
385
if (errno == EBADF){
623
386
perror("readdir");
624
387
exitstatus = EXIT_FAILURE;
625
goto fallback;
388
goto end;
626
389
}
627
390
break;
628
391
}
650
413
break;
651
414
}
652
415
}
416
653
417
if(bad_name){
654
418
continue;
655
419
}
420
656
421
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
657
422
size_t suf_len = strlen(*suf);
658
423
if((d_name_len >= suf_len)
671
436
continue;
672
437
}
673
438
}
674
675
char *filename;
676
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
677
if(ret < 0){
678
perror("asprintf");
679
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;
680
445
}
446
strcpy(filename, plugindir); /* Spurious warning */
447
strcat(filename, "/"); /* Spurious warning */
448
strcat(filename, dirst->d_name); /* Spurious warning */
681
449
682
450
ret = stat(filename, &st);
683
451
if (ret == -1){
684
452
perror("stat");
685
free(filename);
686
continue;
453
exitstatus = EXIT_FAILURE;
454
goto end;
687
455
}
688
689
/* Ignore non-executable files */
456
690
457
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
691
458
if(debug){
692
459
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
695
462
free(filename);
696
463
continue;
697
464
}
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){
465
if(getplugin(dirst->d_name, &plugin_list)->disabled){
706
466
if(debug){
707
467
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
708
468
dirst->d_name);
710
470
free(filename);
711
471
continue;
712
472
}
473
plugin *p = getplugin(dirst->d_name, &plugin_list);
713
474
{
714
475
/* Add global arguments to argument list for this plugin */
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];
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];
747
482
ret = pipe(pipefd);
748
483
if (ret == -1){
749
484
perror("pipe");
750
485
exitstatus = EXIT_FAILURE;
751
goto fallback;
486
goto end;
752
487
}
753
/* Ask OS to automatic close the pipe on exec */
754
488
ret = set_cloexec_flag(pipefd[0]);
755
489
if(ret < 0){
756
490
perror("set_cloexec_flag");
757
491
exitstatus = EXIT_FAILURE;
758
goto fallback;
492
goto end;
759
493
}
760
494
ret = set_cloexec_flag(pipefd[1]);
761
495
if(ret < 0){
762
496
perror("set_cloexec_flag");
763
497
exitstatus = EXIT_FAILURE;
764
goto fallback;
498
goto end;
765
499
}
766
500
/* Block SIGCHLD until process is safely in process list */
767
501
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
768
502
if(ret < 0){
769
503
perror("sigprocmask");
770
504
exitstatus = EXIT_FAILURE;
771
goto fallback;
505
goto end;
772
506
}
773
507
// Starting a new process to be watched
774
508
pid_t pid = fork();
775
if(pid == -1){
776
perror("fork");
777
exitstatus = EXIT_FAILURE;
778
goto fallback;
779
}
780
509
if(pid == 0){
781
510
/* this is the child process */
782
511
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
801
530
above and must now close it manually here. */
802
531
closedir(dir);
803
532
}
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
}
533
if(execv(filename, p->argv) < 0){
534
perror("execv");
535
_exit(EXIT_FAILURE);
814
536
}
815
537
/* no return */
816
538
}
817
/* Parent process */
818
close(pipefd[1]); /* Close unused write end of pipe */
539
/* parent process */
819
540
free(filename);
820
plugin *new_plugin = getplugin(dirst->d_name);
821
if (new_plugin == NULL){
822
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");
823
545
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
824
546
if(ret < 0){
825
perror("sigprocmask");
547
perror("sigprocmask");
826
548
}
827
549
exitstatus = EXIT_FAILURE;
828
goto fallback;
550
goto end;
829
551
}
830
552
831
new_plugin->pid = pid;
832
new_plugin->fd = pipefd[0];
833
553
*new_process = (struct process){ .pid = pid,
554
.fd = pipefd[0],
555
.next = process_list };
556
// List handling
557
process_list = new_process;
834
558
/* Unblock SIGCHLD so signal handler can be run if this process
835
559
has already completed */
836
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
837
561
if(ret < 0){
838
562
perror("sigprocmask");
839
563
exitstatus = EXIT_FAILURE;
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
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);
849
580
}
850
581
851
582
closedir(dir);
852
583
dir = NULL;
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
}
584
585
if (process_list == NULL){
586
fprintf(stderr, "No plugin processes started, exiting\n");
587
exitstatus = EXIT_FAILURE;
588
goto end;
863
589
}
864
865
/* Main loop while running plugins exist */
866
while(plugin_list){
590
while(process_list){
867
591
fd_set rfds = rfds_all;
868
592
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
869
593
if (select_ret == -1){
870
594
perror("select");
871
595
exitstatus = EXIT_FAILURE;
872
goto fallback;
596
goto end;
873
597
}
874
598
/* OK, now either a process completed, or something can be read
875
599
from one of them */
876
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
600
for(process *proc = process_list; proc ; proc = proc->next){
877
601
/* Is this process completely done? */
878
602
if(proc->eof and proc->completed){
879
603
/* Only accept the plugin output if it exited cleanly */
880
604
if(not WIFEXITED(proc->status)
881
605
or WEXITSTATUS(proc->status) != 0){
882
606
/* Bad exit by plugin */
883
884
607
if(debug){
885
608
if(WIFEXITED(proc->status)){
886
609
fprintf(stderr, "Plugin %u exited with status %d\n",
895
618
(unsigned int) (proc->pid));
896
619
}
897
620
}
898
899
621
/* Remove the plugin */
900
622
FD_CLR(proc->fd, &rfds_all);
901
902
623
/* Block signal while modifying process_list */
903
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
624
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
904
625
if(ret < 0){
905
626
perror("sigprocmask");
906
627
exitstatus = EXIT_FAILURE;
907
goto fallback;
908
}
909
free_plugin(proc);
628
goto end;
629
}
630
/* Delete this process entry from the list */
631
if(process_list == proc){
632
/* First one - simple */
633
process_list = proc->next;
634
} else {
635
/* Second one or later */
636
for(process *p = process_list; p != NULL; p = p->next){
637
if(p->next == proc){
638
p->next = proc->next;
639
break;
640
}
641
}
642
}
910
643
/* We are done modifying process list, so unblock signal */
911
644
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
912
645
NULL);
913
646
if(ret < 0){
914
647
perror("sigprocmask");
915
exitstatus = EXIT_FAILURE;
916
goto fallback;
917
}
918
919
if(plugin_list == NULL){
920
break;
921
}
922
continue;
648
}
649
free(proc->buffer);
650
free(proc);
651
/* We deleted this process from the list, so we can't go
652
proc->next. Therefore, start over from the beginning of
653
the process list */
654
break;
923
655
}
924
925
656
/* This process exited nicely, so print its buffer */
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;
657
for(size_t written = 0; written < proc->buffer_length;
658
written += (size_t)ret){
659
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
660
proc->buffer + written,
661
proc->buffer_length
662
- written));
663
if(ret < 0){
664
perror("write");
665
exitstatus = EXIT_FAILURE;
666
goto end;
667
}
932
668
}
933
goto fallback;
669
goto end;
934
670
}
935
936
671
/* This process has not completed. Does it have any output? */
937
672
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
938
673
/* This process had nothing to say at this time */
945
680
if (proc->buffer == NULL){
946
681
perror("malloc");
947
682
exitstatus = EXIT_FAILURE;
948
goto fallback;
683
goto end;
949
684
}
950
685
proc->buffer_size += BUFFER_SIZE;
951
686
}
964
699
}
965
700
}
966
701
}
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
if(process_list == NULL){
703
fprintf(stderr, "All plugin processes failed, exiting\n");
704
exitstatus = EXIT_FAILURE;
982
705
}
983
706
707
end:
984
708
/* Restore old signal handler */
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);
709
sigaction(SIGCHLD, &old_sigchld_action, NULL);
710
711
free(plus_argv);
712
713
/* Free the plugin list */
714
for(plugin *next; plugin_list != NULL; plugin_list = next){
715
next = plugin_list->next;
716
free(plugin_list->argv);
717
free(plugin_list);
996
718
}
997
719
998
720
if(dir != NULL){
1000
722
}
1001
723
1002
724
/* Free the process list and kill the processes */
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
}
725
for(process *next; process_list != NULL; process_list = next){
726
next = process_list->next;
727
close(process_list->fd);
728
ret = kill(process_list->pid, SIGTERM);
729
if(ret == -1 and errno != ESRCH){
730
/* set-uid proccesses migth not get closed */
731
perror("kill");
1011
732
}
733
free(process_list->buffer);
734
free(process_list);
1012
735
}
1013
736
1014
737
/* Wait for any remaining child processes to terminate */
1018
741
if(errno != ECHILD){
1019
742
perror("wait");
1020
743
}
1021
1022
free_plugin_list();
1023
1024
free(plugindir);
1025
free(argfile);
1026
744
1027
745
return exitstatus;
1028
746
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0