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- Committer: Teddy Hogeborn
- Date: 2008-09-01 16:19:32 UTC
- Revision ID: teddy@fukt.bsnet.se-20080901161932-ostp7tulh9aijulh
* plugin-runner.c (add_environment): Never insert existing environment
variables.
(main): Rename "--global-envs" to "--global-env" and "--envs-for" to
"--env-for".
* plugin-runner.xml (SYNOPSIS): Rename "--global-envs" to
"--global-env" and "--envs-for" to
"--env-for".
(OPTIONS): Added "--global-env" and "--env-for".
(FALLBACK): Add id attribute.
(EXIT STATUS): Add text.
(ENVIRONMENT): New section.
(FILES): Document configuration file.
variables.
(main): Rename "--global-envs" to "--global-env" and "--envs-for" to
"--env-for".
* plugin-runner.xml (SYNOPSIS): Rename "--global-envs" to
"--global-env" and "--envs-for" to
"--env-for".
(OPTIONS): Added "--global-env" and "--env-for".
(FALLBACK): Add id attribute.
(EXIT STATUS): Add text.
(ENVIRONMENT): New section.
(FILES): Document configuration file.
- files added:
- .bzrignore
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
27
stderr, STDOUT_FILENO */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
28
42
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
34
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
readdir(), closedir(), dirfd() */
37
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
48
55
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
52
66
53
67
#define BUFFER_SIZE 256
54
68
55
struct process;
56
57
typedef struct process{
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
76
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
84
85
/* Variables used for running processes*/
58
86
pid_t pid;
59
87
int fd;
60
88
char *buffer;
61
89
size_t buffer_size;
62
90
size_t buffer_length;
63
91
bool eof;
64
bool completed;
65
int status;
66
struct process *next;
67
} process;
68
69
typedef struct plugin{
70
char *name; /* can be NULL or any plugin name */
71
char **argv;
72
int argc;
73
bool disabled;
92
volatile bool completed;
93
volatile int status;
74
94
struct plugin *next;
75
95
} plugin;
76
96
77
static plugin *getplugin(char *name, plugin **plugin_list){
78
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){
79
104
if ((p->name == name)
80
105
or (p->name and name and (strcmp(p->name, name) == 0))){
81
106
return p;
84
109
/* Create a new plugin */
85
110
plugin *new_plugin = malloc(sizeof(plugin));
86
111
if (new_plugin == NULL){
87
perror("malloc");
88
exit(EXIT_FAILURE);
89
}
90
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
91
127
new_plugin->argv = malloc(sizeof(char *) * 2);
92
128
if (new_plugin->argv == NULL){
93
perror("malloc");
94
exit(EXIT_FAILURE);
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
95
132
}
96
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
97
134
new_plugin->argv[1] = NULL;
98
new_plugin->argc = 1;
99
new_plugin->disabled = false;
100
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
101
145
/* Append the new plugin to the list */
102
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
103
147
return new_plugin;
104
148
}
105
149
106
static void addargument(plugin *p, char *arg){
107
p->argv[p->argc] = arg;
108
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
109
if (p->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
p->argc++;
114
p->argv[p->argc] = NULL;
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
152
int *len){
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
156
/* Malloc check */
157
if(*array == NULL){
158
return false;
159
}
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
162
if(copy == NULL){
163
return false;
164
}
165
/* Insert the copy */
166
(*array)[*len] = copy;
167
(*len)++;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
170
return true;
171
}
172
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
175
if(p == NULL){
176
return false;
177
}
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
179
}
180
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def){
183
if(p == NULL){
184
return false;
185
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
191
/* Refuse to add an existing variable */
192
return true;
193
}
194
}
195
return add_to_char_array(def, &(p->environ), &(p->envc));
115
196
}
116
197
117
198
/*
130
211
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
131
212
}
132
213
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
136
process *process_list = NULL;
137
138
/* Mark a process as completed when it exits, and save its exit
214
215
/* Mark processes as completed when they exit, and save their exit
139
216
status. */
140
217
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
proc->completed = true;
218
while(true){
219
plugin *proc = plugin_list;
220
int status;
221
pid_t pid = waitpid(-1, &status, WNOHANG);
222
if(pid == 0){
223
/* Only still running child processes */
224
break;
225
}
226
if(pid == -1){
227
if (errno != ECHILD){
228
perror("waitpid");
229
}
230
/* No child processes */
231
break;
232
}
233
234
/* A child exited, find it in process_list */
235
while(proc != NULL and proc->pid != pid){
236
proc = proc->next;
237
}
238
if(proc == NULL){
239
/* Process not found in process list */
240
continue;
241
}
242
proc->status = status;
243
proc->completed = true;
244
}
245
}
246
247
/* Prints out a password to stdout */
248
bool print_out_password(const char *buffer, size_t length){
249
ssize_t ret;
250
if(length>0 and buffer[length-1] == '\n'){
251
length--;
252
}
253
for(size_t written = 0; written < length; written += (size_t)ret){
254
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
255
length - written));
256
if(ret < 0){
257
return false;
258
}
259
}
260
return true;
261
}
262
263
/* Removes and free a plugin from the plugin list */
264
static void free_plugin(plugin *plugin_node){
265
266
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
267
free(*arg);
268
}
269
free(plugin_node->argv);
270
for(char **env = plugin_node->environ; *env != NULL; env++){
271
free(*env);
272
}
273
free(plugin_node->environ);
274
free(plugin_node->buffer);
275
276
/* Removes the plugin from the singly-linked list */
277
if(plugin_node == plugin_list){
278
/* First one - simple */
279
plugin_list = plugin_list->next;
280
} else {
281
/* Second one or later */
282
for(plugin *p = plugin_list; p != NULL; p = p->next){
283
if(p->next == plugin_node){
284
p->next = plugin_node->next;
285
break;
286
}
287
}
288
}
289
290
free(plugin_node);
291
}
292
293
static void free_plugin_list(void){
294
while(plugin_list != NULL){
295
free_plugin(plugin_list);
296
}
153
297
}
154
298
155
299
int main(int argc, char *argv[]){
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
300
char *plugindir = NULL;
301
char *argfile = NULL;
302
FILE *conffp;
157
303
size_t d_name_len;
158
304
DIR *dir = NULL;
159
305
struct dirent *dirst;
167
313
struct sigaction old_sigchld_action;
168
314
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
169
315
.sa_flags = SA_NOCLDSTOP };
170
char *plus_options = NULL;
171
char **plus_argv = NULL;
316
char **custom_argv = NULL;
317
int custom_argc = 0;
172
318
173
319
/* Establish a signal handler */
174
320
sigemptyset(&sigchld_action.sa_mask);
175
321
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
176
if(ret < 0){
322
if(ret == -1){
177
323
perror("sigaddset");
178
exit(EXIT_FAILURE);
324
exitstatus = EXIT_FAILURE;
325
goto fallback;
179
326
}
180
327
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
181
if(ret < 0){
328
if(ret == -1){
182
329
perror("sigaction");
183
exit(EXIT_FAILURE);
330
exitstatus = EXIT_FAILURE;
331
goto fallback;
184
332
}
185
333
186
334
/* The options we understand. */
188
336
{ .name = "global-options", .key = 'g',
189
337
.arg = "OPTION[,OPTION[,...]]",
190
338
.doc = "Options passed to all plugins" },
339
{ .name = "global-env", .key = 'e',
340
.arg = "VAR=value",
341
.doc = "Environment variable passed to all plugins" },
191
342
{ .name = "options-for", .key = 'o',
192
343
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
193
344
.doc = "Options passed only to specified plugin" },
345
{ .name = "env-for", .key = 'f',
346
.arg = "PLUGIN:ENV=value",
347
.doc = "Environment variable passed to specified plugin" },
194
348
{ .name = "disable", .key = 'd',
195
349
.arg = "PLUGIN",
196
350
.doc = "Disable a specific plugin", .group = 1 },
197
351
{ .name = "plugin-dir", .key = 128,
198
352
.arg = "DIRECTORY",
199
353
.doc = "Specify a different plugin directory", .group = 2 },
200
{ .name = "userid", .key = 129,
201
.arg = "ID", .flags = 0,
202
.doc = "User ID the plugins will run as", .group = 2 },
203
{ .name = "groupid", .key = 130,
204
.arg = "ID", .flags = 0,
205
.doc = "Group ID the plugins will run as", .group = 2 },
206
{ .name = "debug", .key = 131,
207
.doc = "Debug mode", .group = 3 },
354
{ .name = "config-file", .key = 129,
355
.arg = "FILE",
356
.doc = "Specify a different configuration file", .group = 2 },
357
{ .name = "userid", .key = 130,
358
.arg = "ID", .flags = 0,
359
.doc = "User ID the plugins will run as", .group = 3 },
360
{ .name = "groupid", .key = 131,
361
.arg = "ID", .flags = 0,
362
.doc = "Group ID the plugins will run as", .group = 3 },
363
{ .name = "debug", .key = 132,
364
.doc = "Debug mode", .group = 4 },
208
365
{ .name = NULL }
209
366
};
210
367
211
error_t parse_opt (int key, char *arg, struct argp_state *state) {
368
error_t parse_opt (int key, char *arg, __attribute__((unused))
369
struct argp_state *state) {
212
370
/* Get the INPUT argument from `argp_parse', which we know is a
213
371
pointer to our plugin list pointer. */
214
plugin **plugins = state->input;
215
372
switch (key) {
216
case 'g':
217
if (arg != NULL){
218
char *p = strtok(arg, ",");
219
do{
220
addargument(getplugin(NULL, plugins), p);
221
p = strtok(NULL, ",");
222
} while (p != NULL);
223
}
224
break;
225
case 'o':
226
if (arg != NULL){
227
char *name = strtok(arg, ":");
228
char *p = strtok(NULL, ":");
229
if(p != NULL){
230
p = strtok(p, ",");
231
do{
232
addargument(getplugin(name, plugins), p);
233
p = strtok(NULL, ",");
234
} while (p != NULL);
235
}
236
}
237
break;
238
case 'd':
239
if (arg != NULL){
240
getplugin(arg, plugins)->disabled = true;
241
}
242
break;
243
case 128:
244
plugindir = arg;
245
break;
246
case 129:
373
case 'g': /* --global-options */
374
if (arg != NULL){
375
char *p;
376
while((p = strsep(&arg, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(NULL), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
384
}
385
}
386
break;
387
case 'e': /* --global-env */
388
if(arg == NULL){
389
break;
390
}
391
{
392
char *envdef = strdup(arg);
393
if(envdef == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), envdef)){
397
perror("add_environment");
398
}
399
}
400
break;
401
case 'o': /* --options-for */
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0'){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0'){
409
break;
410
}
411
if(opt != NULL){
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
421
}
422
}
423
}
424
break;
425
case 'f': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
429
{
430
char *envdef = strchr(arg, ':');
431
if(envdef == NULL){
432
break;
433
}
434
char *p_name = strndup(arg, (size_t) (envdef-arg));
435
if(p_name == NULL){
436
break;
437
}
438
envdef++;
439
if(not add_environment(getplugin(p_name), envdef)){
440
perror("add_environment");
441
}
442
}
443
break;
444
case 'd': /* --disable */
445
if (arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = true;
451
}
452
break;
453
case 128: /* --plugin-dir */
454
plugindir = strdup(arg);
455
if(plugindir == NULL){
456
perror("strdup");
457
}
458
break;
459
case 129: /* --config-file */
460
argfile = strdup(arg);
461
if(argfile == NULL){
462
perror("strdup");
463
}
464
break;
465
case 130: /* --userid */
247
466
uid = (uid_t)strtol(arg, NULL, 10);
248
467
break;
249
case 130:
468
case 131: /* --groupid */
250
469
gid = (gid_t)strtol(arg, NULL, 10);
251
470
break;
252
case 131:
471
case 132: /* --debug */
253
472
debug = true;
254
473
break;
255
474
case ARGP_KEY_ARG:
256
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
257
argp_usage (state);
258
}
259
plus_options = arg;
475
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
260
476
break;
261
477
case ARGP_KEY_END:
262
478
break;
266
482
return 0;
267
483
}
268
484
269
plugin *plugin_list = NULL;
270
271
485
struct argp argp = { .options = options, .parser = parse_opt,
272
486
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
273
487
.doc = "Mandos plugin runner -- Run plugins" };
274
488
275
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
276
277
if(plus_options){
278
/* This is a mangled argument in the form of
279
"+--option+--other-option=parameter+--yet-another-option", etc */
280
/* Make new argc and argv vars, and call argp_parse() again. */
281
plus_options++; /* skip the first '+' character */
282
const char delims[] = "+";
283
char *arg;
284
int new_argc = 1;
285
plus_argv = malloc(sizeof(char*) * 2);
286
if(plus_argv == NULL){
489
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
490
if (ret == ARGP_ERR_UNKNOWN){
491
fprintf(stderr, "Unknown error while parsing arguments\n");
492
exitstatus = EXIT_FAILURE;
493
goto fallback;
494
}
495
496
/* Opens the configfile if aviable */
497
if (argfile == NULL){
498
conffp = fopen(AFILE, "r");
499
} else {
500
conffp = fopen(argfile, "r");
501
}
502
if(conffp != NULL){
503
char *org_line = NULL;
504
char *p, *arg, *new_arg, *line;
505
size_t size = 0;
506
ssize_t sret;
507
const char whitespace_delims[] = " \r\t\f\v\n";
508
const char comment_delim[] = "#";
509
510
custom_argc = 1;
511
custom_argv = malloc(sizeof(char*) * 2);
512
if(custom_argv == NULL){
287
513
perror("malloc");
288
514
exitstatus = EXIT_FAILURE;
289
goto end;
290
}
291
plus_argv[0] = argv[0];
292
plus_argv[1] = NULL;
293
arg = strtok(plus_options, delims); /* Get first argument */
294
while(arg != NULL){
295
new_argc++;
296
plus_argv = realloc(plus_argv, sizeof(char *)
297
* ((unsigned int) new_argc + 1));
298
if(plus_argv == NULL){
299
perror("malloc");
300
exitstatus = EXIT_FAILURE;
301
goto end;
302
}
303
plus_argv[new_argc-1] = arg;
304
plus_argv[new_argc] = NULL;
305
arg = strtok(NULL, delims); /* Get next argument */
306
}
307
argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
515
goto fallback;
516
}
517
custom_argv[0] = argv[0];
518
custom_argv[1] = NULL;
519
520
/* for each line in the config file, strip whitespace and ignore
521
commented text */
522
while(true){
523
sret = getline(&org_line, &size, conffp);
524
if(sret == -1){
525
break;
526
}
527
528
line = org_line;
529
arg = strsep(&line, comment_delim);
530
while((p = strsep(&arg, whitespace_delims)) != NULL){
531
if(p[0] == '\0'){
532
continue;
533
}
534
new_arg = strdup(p);
535
if(new_arg == NULL){
536
perror("strdup");
537
exitstatus = EXIT_FAILURE;
538
free(org_line);
539
goto fallback;
540
}
541
542
custom_argc += 1;
543
custom_argv = realloc(custom_argv, sizeof(char *)
544
* ((unsigned int) custom_argc + 1));
545
if(custom_argv == NULL){
546
perror("realloc");
547
exitstatus = EXIT_FAILURE;
548
free(org_line);
549
goto fallback;
550
}
551
custom_argv[custom_argc-1] = new_arg;
552
custom_argv[custom_argc] = NULL;
553
}
554
}
555
free(org_line);
556
} else{
557
/* Check for harmful errors and go to fallback. Other errors might
558
not affect opening plugins */
559
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
560
perror("fopen");
561
exitstatus = EXIT_FAILURE;
562
goto fallback;
563
}
564
}
565
/* If there was any arguments from configuration file,
566
pass them to parser as command arguments */
567
if(custom_argv != NULL){
568
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
569
if (ret == ARGP_ERR_UNKNOWN){
570
fprintf(stderr, "Unknown error while parsing arguments\n");
571
exitstatus = EXIT_FAILURE;
572
goto fallback;
573
}
308
574
}
309
575
310
576
if(debug){
314
580
for(char **a = p->argv; *a != NULL; a++){
315
581
fprintf(stderr, "\tArg: %s\n", *a);
316
582
}
583
fprintf(stderr, "...and %u environment variables\n", p->envc);
584
for(char **a = p->environ; *a != NULL; a++){
585
fprintf(stderr, "\t%s\n", *a);
586
}
317
587
}
318
588
}
319
589
590
/* Strip permissions down to nobody */
320
591
ret = setuid(uid);
321
592
if (ret == -1){
322
593
perror("setuid");
323
}
324
594
}
325
595
setgid(gid);
326
596
if (ret == -1){
327
597
perror("setgid");
328
598
}
599
600
if (plugindir == NULL){
601
dir = opendir(PDIR);
602
} else {
603
dir = opendir(plugindir);
604
}
329
605
330
dir = opendir(plugindir);
331
606
if(dir == NULL){
332
607
perror("Could not open plugin dir");
333
608
exitstatus = EXIT_FAILURE;
334
goto end;
609
goto fallback;
335
610
}
336
611
337
612
/* Set the FD_CLOEXEC flag on the directory, if possible */
342
617
if(ret < 0){
343
618
perror("set_cloexec_flag");
344
619
exitstatus = EXIT_FAILURE;
345
goto end;
620
goto fallback;
346
621
}
347
622
}
348
623
}
349
624
350
625
FD_ZERO(&rfds_all);
351
626
627
/* Read and execute any executable in the plugin directory*/
352
628
while(true){
353
629
dirst = readdir(dir);
354
630
355
631
// All directory entries have been processed
356
632
if(dirst == NULL){
633
if (errno == EBADF){
634
perror("readdir");
635
exitstatus = EXIT_FAILURE;
636
goto fallback;
637
}
357
638
break;
358
639
}
359
640
380
661
break;
381
662
}
382
663
}
383
384
664
if(bad_name){
385
665
continue;
386
666
}
387
388
667
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
389
668
size_t suf_len = strlen(*suf);
390
669
if((d_name_len >= suf_len)
403
682
continue;
404
683
}
405
684
}
406
407
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
408
if (filename == NULL){
409
perror("malloc");
410
exitstatus = EXIT_FAILURE;
411
goto end;
412
}
413
strcpy(filename, plugindir); /* Spurious warning */
414
strcat(filename, "/"); /* Spurious warning */
415
strcat(filename, dirst->d_name); /* Spurious warning */
416
417
stat(filename, &st);
418
685
686
char *filename;
687
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
688
if(ret < 0){
689
perror("asprintf");
690
continue;
691
}
692
693
ret = stat(filename, &st);
694
if (ret == -1){
695
perror("stat");
696
free(filename);
697
continue;
698
}
699
700
/* Ignore non-executable files */
419
701
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
420
702
if(debug){
421
703
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
424
706
free(filename);
425
707
continue;
426
708
}
427
if(getplugin(dirst->d_name, &plugin_list)->disabled){
709
710
plugin *p = getplugin(dirst->d_name);
711
if(p == NULL){
712
perror("getplugin");
713
free(filename);
714
continue;
715
}
716
if(p->disabled){
428
717
if(debug){
429
718
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
430
719
dirst->d_name);
432
721
free(filename);
433
722
continue;
434
723
}
435
plugin *p = getplugin(dirst->d_name, &plugin_list);
436
724
{
437
725
/* Add global arguments to argument list for this plugin */
438
plugin *g = getplugin(NULL, &plugin_list);
439
for(char **a = g->argv + 1; *a != NULL; a++){
440
addargument(p, *a);
441
}
442
}
443
int pipefd[2];
726
plugin *g = getplugin(NULL);
727
if(g != NULL){
728
for(char **a = g->argv + 1; *a != NULL; a++){
729
if(not add_argument(p, *a)){
730
perror("add_argument");
731
}
732
}
733
/* Add global environment variables */
734
for(char **e = g->environ; *e != NULL; e++){
735
if(not add_environment(p, *e)){
736
perror("add_environment");
737
}
738
}
739
}
740
}
741
/* If this plugin has any environment variables, we will call
742
using execve and need to duplicate the environment from this
743
process, too. */
744
if(p->environ[0] != NULL){
745
for(char **e = environ; *e != NULL; e++){
746
char *copy = strdup(*e);
747
if(copy == NULL){
748
perror("strdup");
749
continue;
750
}
751
if(not add_environment(p, copy)){
752
perror("add_environment");
753
}
754
}
755
}
756
757
int pipefd[2];
444
758
ret = pipe(pipefd);
445
759
if (ret == -1){
446
760
perror("pipe");
447
761
exitstatus = EXIT_FAILURE;
448
goto end;
762
goto fallback;
449
763
}
764
/* Ask OS to automatic close the pipe on exec */
450
765
ret = set_cloexec_flag(pipefd[0]);
451
766
if(ret < 0){
452
767
perror("set_cloexec_flag");
453
768
exitstatus = EXIT_FAILURE;
454
goto end;
769
goto fallback;
455
770
}
456
771
ret = set_cloexec_flag(pipefd[1]);
457
772
if(ret < 0){
458
773
perror("set_cloexec_flag");
459
774
exitstatus = EXIT_FAILURE;
460
goto end;
775
goto fallback;
461
776
}
462
777
/* Block SIGCHLD until process is safely in process list */
463
778
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
464
779
if(ret < 0){
465
780
perror("sigprocmask");
466
781
exitstatus = EXIT_FAILURE;
467
goto end;
782
goto fallback;
468
783
}
469
784
// Starting a new process to be watched
470
785
pid_t pid = fork();
786
if(pid == -1){
787
perror("fork");
788
exitstatus = EXIT_FAILURE;
789
goto fallback;
790
}
471
791
if(pid == 0){
472
792
/* this is the child process */
473
793
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
480
800
perror("sigprocmask");
481
801
_exit(EXIT_FAILURE);
482
802
}
483
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
803
804
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
805
if(ret == -1){
806
perror("dup2");
807
_exit(EXIT_FAILURE);
808
}
484
809
485
810
if(dirfd(dir) < 0){
486
811
/* If dir has no file descriptor, we could not set FD_CLOEXEC
487
812
above and must now close it manually here. */
488
813
closedir(dir);
489
814
}
490
if(execv(filename, p->argv) < 0){
491
perror("execv");
492
_exit(EXIT_FAILURE);
815
if(p->environ[0] == NULL){
816
if(execv(filename, p->argv) < 0){
817
perror("execv");
818
_exit(EXIT_FAILURE);
819
}
820
} else {
821
if(execve(filename, p->argv, p->environ) < 0){
822
perror("execve");
823
_exit(EXIT_FAILURE);
824
}
493
825
}
494
826
/* no return */
495
827
}
496
/* parent process */
828
/* Parent process */
829
close(pipefd[1]); /* Close unused write end of pipe */
497
830
free(filename);
498
close(pipefd[1]); /* close unused write end of pipe */
499
process *new_process = malloc(sizeof(process));
500
if (new_process == NULL){
501
perror("malloc");
831
plugin *new_plugin = getplugin(dirst->d_name);
832
if (new_plugin == NULL){
833
perror("getplugin");
502
834
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
503
835
if(ret < 0){
504
perror("sigprocmask");
836
perror("sigprocmask");
505
837
}
506
838
exitstatus = EXIT_FAILURE;
507
goto end;
839
goto fallback;
508
840
}
509
841
510
*new_process = (struct process){ .pid = pid,
511
.fd = pipefd[0],
512
.next = process_list };
513
// List handling
514
process_list = new_process;
842
new_plugin->pid = pid;
843
new_plugin->fd = pipefd[0];
844
515
845
/* Unblock SIGCHLD so signal handler can be run if this process
516
846
has already completed */
517
847
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
518
848
if(ret < 0){
519
849
perror("sigprocmask");
520
850
exitstatus = EXIT_FAILURE;
521
goto end;
522
}
523
524
FD_SET(new_process->fd, &rfds_all);
525
526
if (maxfd < new_process->fd){
527
maxfd = new_process->fd;
528
}
529
530
}
531
532
/* Free the plugin list */
533
for(plugin *next; plugin_list != NULL; plugin_list = next){
534
next = plugin_list->next;
535
free(plugin_list->argv);
536
free(plugin_list);
851
goto fallback;
852
}
853
854
FD_SET(new_plugin->fd, &rfds_all);
855
856
if (maxfd < new_plugin->fd){
857
maxfd = new_plugin->fd;
858
}
859
537
860
}
538
861
539
862
closedir(dir);
540
863
dir = NULL;
541
542
if (process_list == NULL){
543
fprintf(stderr, "No plugin processes started, exiting\n");
544
exitstatus = EXIT_FAILURE;
545
goto end;
864
865
for(plugin *p = plugin_list; p != NULL; p = p->next){
866
if(p->pid != 0){
867
break;
868
}
869
if(p->next == NULL){
870
fprintf(stderr, "No plugin processes started. Incorrect plugin"
871
" directory?\n");
872
free_plugin_list();
873
}
546
874
}
547
while(process_list){
875
876
/* Main loop while running plugins exist */
877
while(plugin_list){
548
878
fd_set rfds = rfds_all;
549
879
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
550
880
if (select_ret == -1){
551
881
perror("select");
552
882
exitstatus = EXIT_FAILURE;
553
goto end;
883
goto fallback;
554
884
}
555
885
/* OK, now either a process completed, or something can be read
556
886
from one of them */
557
for(process *proc = process_list; proc ; proc = proc->next){
887
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
558
888
/* Is this process completely done? */
559
889
if(proc->eof and proc->completed){
560
890
/* Only accept the plugin output if it exited cleanly */
561
891
if(not WIFEXITED(proc->status)
562
892
or WEXITSTATUS(proc->status) != 0){
563
893
/* Bad exit by plugin */
894
564
895
if(debug){
565
896
if(WIFEXITED(proc->status)){
566
fprintf(stderr, "Plugin %d exited with status %d\n",
567
proc->pid, WEXITSTATUS(proc->status));
897
fprintf(stderr, "Plugin %u exited with status %d\n",
898
(unsigned int) (proc->pid),
899
WEXITSTATUS(proc->status));
568
900
} else if(WIFSIGNALED(proc->status)) {
569
fprintf(stderr, "Plugin %d killed by signal %d\n",
570
proc->pid, WTERMSIG(proc->status));
901
fprintf(stderr, "Plugin %u killed by signal %d\n",
902
(unsigned int) (proc->pid),
903
WTERMSIG(proc->status));
571
904
} else if(WCOREDUMP(proc->status)){
572
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
905
fprintf(stderr, "Plugin %d dumped core\n",
906
(unsigned int) (proc->pid));
573
907
}
574
908
}
909
575
910
/* Remove the plugin */
576
911
FD_CLR(proc->fd, &rfds_all);
912
577
913
/* Block signal while modifying process_list */
578
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
914
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
579
915
if(ret < 0){
580
916
perror("sigprocmask");
581
917
exitstatus = EXIT_FAILURE;
582
goto end;
583
}
584
/* Delete this process entry from the list */
585
if(process_list == proc){
586
/* First one - simple */
587
process_list = proc->next;
588
} else {
589
/* Second one or later */
590
for(process *p = process_list; p != NULL; p = p->next){
591
if(p->next == proc){
592
p->next = proc->next;
593
break;
594
}
595
}
596
}
918
goto fallback;
919
}
920
free_plugin(proc);
597
921
/* We are done modifying process list, so unblock signal */
598
922
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
599
923
NULL);
600
924
if(ret < 0){
601
925
perror("sigprocmask");
602
}
603
free(proc->buffer);
604
free(proc);
605
/* We deleted this process from the list, so we can't go
606
proc->next. Therefore, start over from the beginning of
607
the process list */
608
break;
926
exitstatus = EXIT_FAILURE;
927
goto fallback;
928
}
929
930
if(plugin_list == NULL){
931
break;
932
}
933
continue;
609
934
}
935
610
936
/* This process exited nicely, so print its buffer */
611
for(size_t written = 0; written < proc->buffer_length;
612
written += (size_t)ret){
613
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
614
proc->buffer + written,
615
proc->buffer_length
616
- written));
617
if(ret < 0){
618
perror("write");
619
exitstatus = EXIT_FAILURE;
620
goto end;
621
}
937
938
bool bret = print_out_password(proc->buffer,
939
proc->buffer_length);
940
if(not bret){
941
perror("print_out_password");
942
exitstatus = EXIT_FAILURE;
622
943
}
623
goto end;
944
goto fallback;
624
945
}
946
625
947
/* This process has not completed. Does it have any output? */
626
948
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
627
949
/* This process had nothing to say at this time */
634
956
if (proc->buffer == NULL){
635
957
perror("malloc");
636
958
exitstatus = EXIT_FAILURE;
637
goto end;
959
goto fallback;
638
960
}
639
961
proc->buffer_size += BUFFER_SIZE;
640
962
}
653
975
}
654
976
}
655
977
}
656
if(process_list == NULL){
657
fprintf(stderr, "All plugin processes failed, exiting\n");
658
exitstatus = EXIT_FAILURE;
978
979
980
fallback:
981
982
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
983
/* Fallback if all plugins failed, none are found or an error
984
occured */
985
bool bret;
986
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
987
char *passwordbuffer = getpass("Password: ");
988
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
989
if(not bret){
990
perror("print_out_password");
991
exitstatus = EXIT_FAILURE;
992
}
659
993
}
660
994
661
end:
662
995
/* Restore old signal handler */
663
sigaction(SIGCHLD, &old_sigchld_action, NULL);
664
665
free(plus_argv);
666
667
/* Free the plugin list */
668
for(plugin *next; plugin_list != NULL; plugin_list = next){
669
next = plugin_list->next;
670
free(plugin_list->argv);
671
free(plugin_list);
996
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
997
if(ret == -1){
998
perror("sigaction");
999
exitstatus = EXIT_FAILURE;
1000
}
1001
1002
if(custom_argv != NULL){
1003
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1004
free(*arg);
1005
}
1006
free(custom_argv);
672
1007
}
673
1008
674
1009
if(dir != NULL){
676
1011
}
677
1012
678
1013
/* Free the process list and kill the processes */
679
for(process *next; process_list != NULL; process_list = next){
680
next = process_list->next;
681
close(process_list->fd);
682
kill(process_list->pid, SIGTERM);
683
free(process_list->buffer);
684
free(process_list);
1014
for(plugin *p = plugin_list; p != NULL; p = p->next){
1015
if(p->pid != 0){
1016
close(p->fd);
1017
ret = kill(p->pid, SIGTERM);
1018
if(ret == -1 and errno != ESRCH){
1019
/* Set-uid proccesses might not get closed */
1020
perror("kill");
1021
}
1022
}
685
1023
}
686
1024
687
1025
/* Wait for any remaining child processes to terminate */
691
1029
if(errno != ECHILD){
692
1030
perror("wait");
693
1031
}
1032
1033
free_plugin_list();
1034
1035
free(plugindir);
1036
free(argfile);
694
1037
695
1038
return exitstatus;
696
1039
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0