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- Committer: Björn Påhlsson
- Date: 2009-02-09 18:15:18 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 309.
- Revision ID: belorn@braxen-20090209181518-powtql91qv3wu51d
Earlier signal handling
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
21
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
23
*/
23
24
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
27
#include <stddef.h> /* size_t, NULL */
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
54
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), strcpy(),
55
strcat() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
56
#include <errno.h> /* errno */
57
57
#include <argp.h> /* struct argp_option, struct
58
58
argp_state, struct argp,
59
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
61
62
#include <signal.h> /* struct sigaction, sigemptyset(),
62
63
sigaddset(), sigaction(),
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
65
SIG_UNBLOCK, kill() */
65
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
66
68
67
69
#define BUFFER_SIZE 256
68
#define CONFFILE "/conf/conf.d/mandos/client.conf"
69
70
const char *argp_program_version = "mandos-client 1.0";
70
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
74
const char *argp_program_version = "plugin-runner " VERSION;
71
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
76
73
struct process;
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;
74
84
75
typedef struct process{
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;
92
volatile sig_atomic_t completed;
83
93
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
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
if ((p->name == name)
98
or (p->name and name and (strcmp(p->name, name) == 0))){
97
static plugin *plugin_list = NULL;
98
99
/* Gets an 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){
104
if((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
99
106
return p;
100
107
}
101
108
}
102
109
/* Create a new plugin */
103
110
plugin *new_plugin = malloc(sizeof(plugin));
104
if (new_plugin == NULL){
105
perror("malloc");
106
exit(EXIT_FAILURE);
107
}
108
new_plugin->name = name;
111
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
free(new_plugin);
119
return NULL;
120
}
121
}
122
123
*new_plugin = (plugin){ .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
127
109
128
new_plugin->argv = malloc(sizeof(char *) * 2);
110
if (new_plugin->argv == NULL){
111
perror("malloc");
112
exit(EXIT_FAILURE);
129
if(new_plugin->argv == NULL){
130
free(copy_name);
131
free(new_plugin);
132
return NULL;
113
133
}
114
new_plugin->argv[0] = name;
134
new_plugin->argv[0] = copy_name;
115
135
new_plugin->argv[1] = NULL;
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
new_plugin->next = *plugin_list;
136
137
new_plugin->environ = malloc(sizeof(char *));
138
if(new_plugin->environ == NULL){
139
free(copy_name);
140
free(new_plugin->argv);
141
free(new_plugin);
142
return NULL;
143
}
144
new_plugin->environ[0] = NULL;
145
119
146
/* Append the new plugin to the list */
120
*plugin_list = new_plugin;
147
plugin_list = new_plugin;
121
148
return new_plugin;
122
149
}
123
150
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;
151
/* Helper function for add_argument and add_environment */
152
static bool add_to_char_array(const char *new, char ***array,
153
int *len){
154
/* Resize the pointed-to array to hold one more pointer */
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
157
/* Malloc check */
158
if(*array == NULL){
159
return false;
160
}
161
/* Make a copy of the new string */
162
char *copy = strdup(new);
163
if(copy == NULL){
164
return false;
165
}
166
/* Insert the copy */
167
(*array)[*len] = copy;
168
(*len)++;
169
/* Add a new terminating NULL pointer to the last element */
170
(*array)[*len] = NULL;
171
return true;
172
}
173
174
/* Add to a plugin's argument vector */
175
static bool add_argument(plugin *p, const char *arg){
176
if(p == NULL){
177
return false;
178
}
179
return add_to_char_array(arg, &(p->argv), &(p->argc));
180
}
181
182
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
184
if(p == NULL){
185
return false;
186
}
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
193
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
196
return false;
197
}
198
*e = new;
199
strcpy(*e, def);
200
}
201
return true;
202
}
203
}
204
return add_to_char_array(def, &(p->environ), &(p->envc));
133
205
}
134
206
135
207
/*
137
209
* Descriptor Flags".
138
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
139
211
*/
140
static int set_cloexec_flag(int fd)
141
{
212
static int set_cloexec_flag(int fd){
142
213
int ret = fcntl(fd, F_GETFD, 0);
143
214
/* If reading the flags failed, return error indication now. */
144
215
if(ret < 0){
148
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
149
220
}
150
221
151
process *process_list = NULL;
152
222
153
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
154
224
status. */
155
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;
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
int old_errno = errno;
227
while(true){
228
plugin *proc = plugin_list;
229
int status;
230
pid_t pid = waitpid(-1, &status, WNOHANG);
231
if(pid == 0){
232
/* Only still running child processes */
233
break;
234
}
235
if(pid == -1){
236
if(errno == ECHILD){
237
/* No child processes */
238
break;
239
}
240
perror("waitpid");
241
}
242
243
/* A child exited, find it in process_list */
244
while(proc != NULL and proc->pid != pid){
245
proc = proc->next;
246
}
247
if(proc == NULL){
248
/* Process not found in process list */
249
continue;
250
}
251
proc->status = status;
252
proc->completed = 1;
253
}
254
errno = old_errno;
172
255
}
173
256
174
bool print_out_password(const char *buffer, size_t length){
257
/* Prints out a password to stdout */
258
static bool print_out_password(const char *buffer, size_t length){
175
259
ssize_t ret;
176
if(length>0 and buffer[length-1] == '\n'){
177
length--;
178
}
179
260
for(size_t written = 0; written < length; written += (size_t)ret){
180
261
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
181
262
length - written));
186
267
return true;
187
268
}
188
269
189
char ** addcustomargument(char **argv, int *argc, char *arg){
270
/* Removes and free a plugin from the plugin list */
271
static void free_plugin(plugin *plugin_node){
272
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
274
free(*arg);
275
}
276
free(plugin_node->argv);
277
for(char **env = plugin_node->environ; *env != NULL; env++){
278
free(*env);
279
}
280
free(plugin_node->environ);
281
free(plugin_node->buffer);
190
282
191
if (argv == NULL){
192
*argc = 1;
193
argv = malloc(sizeof(char*) * 2);
194
if(argv == NULL){
195
return NULL;
283
/* Removes the plugin from the singly-linked list */
284
if(plugin_node == plugin_list){
285
/* First one - simple */
286
plugin_list = plugin_list->next;
287
} else {
288
/* Second one or later */
289
for(plugin *p = plugin_list; p != NULL; p = p->next){
290
if(p->next == plugin_node){
291
p->next = plugin_node->next;
292
break;
293
}
196
294
}
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;
295
}
296
297
free(plugin_node);
298
}
299
300
static void free_plugin_list(void){
301
while(plugin_list != NULL){
302
free_plugin(plugin_list);
303
}
209
304
}
210
305
211
306
int main(int argc, char *argv[]){
212
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
213
const char *conffile = CONFFILE;
307
char *plugindir = NULL;
308
char *argfile = NULL;
214
309
FILE *conffp;
215
310
size_t d_name_len;
216
311
DIR *dir = NULL;
217
312
struct dirent *dirst;
218
313
struct stat st;
219
314
fd_set rfds_all;
220
int ret, maxfd = 0;
315
int ret, numchars, maxfd = 0;
316
ssize_t sret;
317
intmax_t tmpmax;
221
318
uid_t uid = 65534;
222
319
gid_t gid = 65534;
223
320
bool debug = false;
231
328
/* Establish a signal handler */
232
329
sigemptyset(&sigchld_action.sa_mask);
233
330
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
234
if(ret < 0){
331
if(ret == -1){
235
332
perror("sigaddset");
236
exit(EXIT_FAILURE);
333
exitstatus = EXIT_FAILURE;
334
goto fallback;
237
335
}
238
336
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
239
if(ret < 0){
337
if(ret == -1){
240
338
perror("sigaction");
241
exit(EXIT_FAILURE);
339
exitstatus = EXIT_FAILURE;
340
goto fallback;
242
341
}
243
342
244
343
/* The options we understand. */
246
345
{ .name = "global-options", .key = 'g',
247
346
.arg = "OPTION[,OPTION[,...]]",
248
347
.doc = "Options passed to all plugins" },
348
{ .name = "global-env", .key = 'G',
349
.arg = "VAR=value",
350
.doc = "Environment variable passed to all plugins" },
249
351
{ .name = "options-for", .key = 'o',
250
352
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
251
353
.doc = "Options passed only to specified plugin" },
354
{ .name = "env-for", .key = 'E',
355
.arg = "PLUGIN:ENV=value",
356
.doc = "Environment variable passed to specified plugin" },
252
357
{ .name = "disable", .key = 'd',
253
358
.arg = "PLUGIN",
254
359
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
361
.arg = "PLUGIN",
362
.doc = "Enable a specific plugin", .group = 1 },
255
363
{ .name = "plugin-dir", .key = 128,
256
364
.arg = "DIRECTORY",
257
365
.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 },
366
{ .name = "config-file", .key = 129,
367
.arg = "FILE",
368
.doc = "Specify a different configuration file", .group = 2 },
369
{ .name = "userid", .key = 130,
370
.arg = "ID", .flags = 0,
371
.doc = "User ID the plugins will run as", .group = 3 },
372
{ .name = "groupid", .key = 131,
373
.arg = "ID", .flags = 0,
374
.doc = "Group ID the plugins will run as", .group = 3 },
375
{ .name = "debug", .key = 132,
376
.doc = "Debug mode", .group = 4 },
266
377
{ .name = NULL }
267
378
};
268
379
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
270
/* Get the INPUT argument from `argp_parse', which we know is a
271
pointer to our plugin list pointer. */
272
plugin **plugins = state->input;
273
switch (key) {
274
case 'g':
275
if (arg != NULL){
276
char *p;
277
while((p = strsep(&arg, ",")) != NULL){
278
if(p[0] == '\0'){
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
382
switch(key){
383
case 'g': /* --global-options */
384
if(arg != NULL){
385
char *plugin_option;
386
while((plugin_option = strsep(&arg, ",")) != NULL){
387
if(plugin_option[0] == '\0'){
279
388
continue;
280
389
}
281
addargument(getplugin(NULL, plugins), p);
282
}
283
}
284
break;
285
case 'o':
286
if (arg != NULL){
287
char *name = strsep(&arg, ":");
288
if(name[0] == '\0'){
289
break;
290
}
291
char *opt = strsep(&arg, ":");
292
if(opt[0] == '\0'){
293
break;
294
}
295
if(opt != NULL){
296
char *p;
297
while((p = strsep(&opt, ",")) != NULL){
298
if(p[0] == '\0'){
299
continue;
300
}
301
addargument(getplugin(name, plugins), p);
302
}
303
}
304
}
305
break;
306
case 'd':
307
if (arg != NULL){
308
getplugin(arg, plugins)->disabled = true;
309
}
310
break;
311
case 128:
312
plugindir = arg;
313
break;
314
case 129:
315
uid = (uid_t)strtol(arg, NULL, 10);
316
break;
317
case 130:
318
gid = (gid_t)strtol(arg, NULL, 10);
319
break;
320
case 131:
390
if(not add_argument(getplugin(NULL), plugin_option)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
393
}
394
}
395
}
396
break;
397
case 'G': /* --global-env */
398
if(arg == NULL){
399
break;
400
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
403
}
404
break;
405
case 'o': /* --options-for */
406
if(arg != NULL){
407
char *plugin_name = strsep(&arg, ":");
408
if(plugin_name[0] == '\0'){
409
break;
410
}
411
char *plugin_option;
412
while((plugin_option = strsep(&arg, ",")) != NULL){
413
if(not add_argument(getplugin(plugin_name), plugin_option)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
416
}
417
}
418
}
419
break;
420
case 'E': /* --env-for */
421
if(arg == NULL){
422
break;
423
}
424
{
425
char *envdef = strchr(arg, ':');
426
if(envdef == NULL){
427
break;
428
}
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
432
}
433
}
434
break;
435
case 'd': /* --disable */
436
if(arg != NULL){
437
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
440
}
441
p->disabled = true;
442
}
443
break;
444
case 'e': /* --enable */
445
if(arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = false;
451
}
452
break;
453
case 128: /* --plugin-dir */
454
free(plugindir);
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
459
break;
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
462
break;
463
case 130: /* --userid */
464
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
465
if(ret < 1 or tmpmax != (uid_t)tmpmax
466
or arg[numchars] != '\0'){
467
fprintf(stderr, "Bad user ID number: \"%s\", using %"
468
PRIdMAX "\n", arg, (intmax_t)uid);
469
} else {
470
uid = (uid_t)tmpmax;
471
}
472
break;
473
case 131: /* --groupid */
474
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
475
if(ret < 1 or tmpmax != (gid_t)tmpmax
476
or arg[numchars] != '\0'){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %"
478
PRIdMAX "\n", arg, (intmax_t)gid);
479
} else {
480
gid = (gid_t)tmpmax;
481
}
482
break;
483
case 132: /* --debug */
321
484
debug = true;
322
485
break;
323
case ARGP_KEY_ARG:
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
325
break;
326
case ARGP_KEY_END:
327
break;
328
default:
329
return ARGP_ERR_UNKNOWN;
330
}
331
return 0;
332
}
333
334
plugin *plugin_list = NULL;
335
336
struct argp argp = { .options = options, .parser = parse_opt,
337
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
486
/*
487
* When adding more options before this line, remember to also add a
488
* "case" to the "parse_opt_config_file" function below.
489
*/
490
case ARGP_KEY_ARG:
491
/* Cryptsetup always passes an argument, which is an empty
492
string if "none" was specified in /etc/crypttab. So if
493
argument was empty, we ignore it silently. */
494
if(arg[0] != '\0'){
495
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
496
}
497
break;
498
case ARGP_KEY_END:
499
break;
500
default:
501
return ARGP_ERR_UNKNOWN;
502
}
503
return 0;
504
}
505
506
/* This option parser is the same as parse_opt() above, except it
507
ignores everything but the --config-file option. */
508
error_t parse_opt_config_file(int key, char *arg,
509
__attribute__((unused))
510
struct argp_state *state){
511
switch(key){
512
case 'g': /* --global-options */
513
case 'G': /* --global-env */
514
case 'o': /* --options-for */
515
case 'E': /* --env-for */
516
case 'd': /* --disable */
517
case 'e': /* --enable */
518
case 128: /* --plugin-dir */
519
break;
520
case 129: /* --config-file */
521
free(argfile);
522
argfile = strdup(arg);
523
if(argfile == NULL){
524
perror("strdup");
525
}
526
break;
527
case 130: /* --userid */
528
case 131: /* --groupid */
529
case 132: /* --debug */
530
case ARGP_KEY_ARG:
531
case ARGP_KEY_END:
532
break;
533
default:
534
return ARGP_ERR_UNKNOWN;
535
}
536
return 0;
537
}
538
539
struct argp argp = { .options = options,
540
.parser = parse_opt_config_file,
541
.args_doc = "",
338
542
.doc = "Mandos plugin runner -- Run plugins" };
339
543
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
341
if (ret == ARGP_ERR_UNKNOWN){
544
/* Parse using parse_opt_config_file() in order to get the custom
545
config file location, if any. */
546
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
547
if(ret == ARGP_ERR_UNKNOWN){
342
548
fprintf(stderr, "Unknown error while parsing arguments\n");
343
549
exitstatus = EXIT_FAILURE;
344
goto end;
550
goto fallback;
345
551
}
346
347
conffp = fopen(conffile, "r");
552
553
/* Reset to the normal argument parser */
554
argp.parser = parse_opt;
555
556
/* Open the configfile if available */
557
if(argfile == NULL){
558
conffp = fopen(AFILE, "r");
559
} else {
560
conffp = fopen(argfile, "r");
561
}
348
562
if(conffp != NULL){
349
563
char *org_line = NULL;
564
char *p, *arg, *new_arg, *line;
350
565
size_t size = 0;
351
ssize_t sret;
352
char *p, *arg, *new_arg, *line;
353
566
const char whitespace_delims[] = " \r\t\f\v\n";
354
567
const char comment_delim[] = "#";
355
568
569
custom_argc = 1;
570
custom_argv = malloc(sizeof(char*) * 2);
571
if(custom_argv == NULL){
572
perror("malloc");
573
exitstatus = EXIT_FAILURE;
574
goto fallback;
575
}
576
custom_argv[0] = argv[0];
577
custom_argv[1] = NULL;
578
579
/* for each line in the config file, strip whitespace and ignore
580
commented text */
356
581
while(true){
357
582
sret = getline(&org_line, &size, conffp);
358
583
if(sret == -1){
366
591
continue;
367
592
}
368
593
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
}
594
if(new_arg == NULL){
595
perror("strdup");
596
exitstatus = EXIT_FAILURE;
597
free(org_line);
598
goto fallback;
599
}
600
601
custom_argc += 1;
602
custom_argv = realloc(custom_argv, sizeof(char *)
603
* ((unsigned int) custom_argc + 1));
604
if(custom_argv == NULL){
605
perror("realloc");
606
exitstatus = EXIT_FAILURE;
607
free(org_line);
608
goto fallback;
609
}
610
custom_argv[custom_argc-1] = new_arg;
611
custom_argv[custom_argc] = NULL;
375
612
}
376
613
}
377
614
free(org_line);
378
} else{
379
/* check for harmfull errors */
380
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
615
} else {
616
/* Check for harmful errors and go to fallback. Other errors might
617
not affect opening plugins */
618
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
381
619
perror("fopen");
382
620
exitstatus = EXIT_FAILURE;
383
goto end;
621
goto fallback;
384
622
}
385
623
}
386
624
/* If there was any arguments from configuration file,
625
pass them to parser as command arguments */
387
626
if(custom_argv != NULL){
388
custom_argv[0] = argv[0];
389
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
390
if (ret == ARGP_ERR_UNKNOWN){
627
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
628
0, NULL);
629
if(ret == ARGP_ERR_UNKNOWN){
391
630
fprintf(stderr, "Unknown error while parsing arguments\n");
392
631
exitstatus = EXIT_FAILURE;
393
goto end;
632
goto fallback;
394
633
}
395
634
}
396
635
636
/* Parse actual command line arguments, to let them override the
637
config file */
638
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
639
if(ret == ARGP_ERR_UNKNOWN){
640
fprintf(stderr, "Unknown error while parsing arguments\n");
641
exitstatus = EXIT_FAILURE;
642
goto fallback;
643
}
644
397
645
if(debug){
398
646
for(plugin *p = plugin_list; p != NULL; p=p->next){
399
647
fprintf(stderr, "Plugin: %s has %d arguments\n",
401
649
for(char **a = p->argv; *a != NULL; a++){
402
650
fprintf(stderr, "\tArg: %s\n", *a);
403
651
}
652
fprintf(stderr, "...and %d environment variables\n", p->envc);
653
for(char **a = p->environ; *a != NULL; a++){
654
fprintf(stderr, "\t%s\n", *a);
655
}
404
656
}
405
657
}
406
658
659
/* Strip permissions down to nobody */
660
setgid(gid);
661
if(ret == -1){
662
perror("setgid");
663
}
407
664
ret = setuid(uid);
408
if (ret == -1){
665
if(ret == -1){
409
666
perror("setuid");
410
667
}
411
668
412
setgid(gid);
413
if (ret == -1){
414
perror("setgid");
669
if(plugindir == NULL){
670
dir = opendir(PDIR);
671
} else {
672
dir = opendir(plugindir);
415
673
}
416
674
417
dir = opendir(plugindir);
418
675
if(dir == NULL){
419
676
perror("Could not open plugin dir");
420
677
exitstatus = EXIT_FAILURE;
421
goto end;
678
goto fallback;
422
679
}
423
680
424
681
/* Set the FD_CLOEXEC flag on the directory, if possible */
429
686
if(ret < 0){
430
687
perror("set_cloexec_flag");
431
688
exitstatus = EXIT_FAILURE;
432
goto end;
689
goto fallback;
433
690
}
434
691
}
435
692
}
436
693
437
694
FD_ZERO(&rfds_all);
438
695
696
/* Read and execute any executable in the plugin directory*/
439
697
while(true){
440
698
dirst = readdir(dir);
441
699
442
// All directory entries have been processed
700
/* All directory entries have been processed */
443
701
if(dirst == NULL){
444
if (errno == EBADF){
702
if(errno == EBADF){
445
703
perror("readdir");
446
704
exitstatus = EXIT_FAILURE;
447
goto end;
705
goto fallback;
448
706
}
449
707
break;
450
708
}
451
709
452
710
d_name_len = strlen(dirst->d_name);
453
711
454
// Ignore dotfiles, backup files and other junk
712
/* Ignore dotfiles, backup files and other junk */
455
713
{
456
714
bool bad_name = false;
457
715
459
717
460
718
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
461
719
".dpkg-old",
720
".dpkg-bak",
462
721
".dpkg-divert", NULL };
463
722
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
464
723
size_t pre_len = strlen(*pre);
472
731
break;
473
732
}
474
733
}
475
476
734
if(bad_name){
477
735
continue;
478
736
}
479
480
737
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
481
738
size_t suf_len = strlen(*suf);
482
739
if((d_name_len >= suf_len)
495
752
continue;
496
753
}
497
754
}
498
499
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
500
if (filename == NULL){
501
perror("malloc");
755
756
char *filename;
757
if(plugindir == NULL){
758
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
759
} else {
760
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
761
}
762
if(ret < 0){
763
perror("asprintf");
502
764
continue;
503
765
}
504
strcpy(filename, plugindir); /* Spurious warning */
505
strcat(filename, "/"); /* Spurious warning */
506
strcat(filename, dirst->d_name); /* Spurious warning */
507
766
508
767
ret = stat(filename, &st);
509
if (ret == -1){
768
if(ret == -1){
510
769
perror("stat");
511
770
free(filename);
512
771
continue;
513
772
}
514
515
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
773
774
/* Ignore non-executable files */
775
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
516
776
if(debug){
517
777
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
518
778
" with bad type or mode\n", filename);
520
780
free(filename);
521
781
continue;
522
782
}
523
if(getplugin(dirst->d_name, &plugin_list)->disabled){
783
784
plugin *p = getplugin(dirst->d_name);
785
if(p == NULL){
786
perror("getplugin");
787
free(filename);
788
continue;
789
}
790
if(p->disabled){
524
791
if(debug){
525
792
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
526
793
dirst->d_name);
528
795
free(filename);
529
796
continue;
530
797
}
531
plugin *p = getplugin(dirst->d_name, &plugin_list);
532
798
{
533
799
/* 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];
800
plugin *g = getplugin(NULL);
801
if(g != NULL){
802
for(char **a = g->argv + 1; *a != NULL; a++){
803
if(not add_argument(p, *a)){
804
perror("add_argument");
805
}
806
}
807
/* Add global environment variables */
808
for(char **e = g->environ; *e != NULL; e++){
809
if(not add_environment(p, *e, false)){
810
perror("add_environment");
811
}
812
}
813
}
814
}
815
/* If this plugin has any environment variables, we will call
816
using execve and need to duplicate the environment from this
817
process, too. */
818
if(p->environ[0] != NULL){
819
for(char **e = environ; *e != NULL; e++){
820
if(not add_environment(p, *e, false)){
821
perror("add_environment");
822
}
823
}
824
}
825
826
int pipefd[2];
540
827
ret = pipe(pipefd);
541
if (ret == -1){
828
if(ret == -1){
542
829
perror("pipe");
543
830
exitstatus = EXIT_FAILURE;
544
goto end;
831
goto fallback;
545
832
}
833
/* Ask OS to automatic close the pipe on exec */
546
834
ret = set_cloexec_flag(pipefd[0]);
547
835
if(ret < 0){
548
836
perror("set_cloexec_flag");
549
837
exitstatus = EXIT_FAILURE;
550
goto end;
838
goto fallback;
551
839
}
552
840
ret = set_cloexec_flag(pipefd[1]);
553
841
if(ret < 0){
554
842
perror("set_cloexec_flag");
555
843
exitstatus = EXIT_FAILURE;
556
goto end;
844
goto fallback;
557
845
}
558
846
/* Block SIGCHLD until process is safely in process list */
559
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
847
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
560
848
if(ret < 0){
561
849
perror("sigprocmask");
562
850
exitstatus = EXIT_FAILURE;
563
goto end;
851
goto fallback;
564
852
}
565
// Starting a new process to be watched
853
/* Starting a new process to be watched */
566
854
pid_t pid = fork();
567
855
if(pid == -1){
568
856
perror("fork");
569
857
exitstatus = EXIT_FAILURE;
570
goto end;
858
goto fallback;
571
859
}
572
860
if(pid == 0){
573
861
/* this is the child process */
576
864
perror("sigaction");
577
865
_exit(EXIT_FAILURE);
578
866
}
579
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
867
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
580
868
if(ret < 0){
581
869
perror("sigprocmask");
582
870
_exit(EXIT_FAILURE);
583
871
}
584
872
585
873
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
586
874
if(ret == -1){
587
875
perror("dup2");
593
881
above and must now close it manually here. */
594
882
closedir(dir);
595
883
}
596
if(execv(filename, p->argv) < 0){
597
perror("execv");
598
_exit(EXIT_FAILURE);
884
if(p->environ[0] == NULL){
885
if(execv(filename, p->argv) < 0){
886
perror("execv");
887
_exit(EXIT_FAILURE);
888
}
889
} else {
890
if(execve(filename, p->argv, p->environ) < 0){
891
perror("execve");
892
_exit(EXIT_FAILURE);
893
}
599
894
}
600
895
/* no return */
601
896
}
602
/* parent process */
897
/* Parent process */
898
close(pipefd[1]); /* Close unused write end of pipe */
603
899
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");
608
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
900
plugin *new_plugin = getplugin(dirst->d_name);
901
if(new_plugin == NULL){
902
perror("getplugin");
903
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
609
904
if(ret < 0){
610
perror("sigprocmask");
905
perror("sigprocmask");
611
906
}
612
907
exitstatus = EXIT_FAILURE;
613
goto end;
908
goto fallback;
614
909
}
615
910
616
*new_process = (struct process){ .pid = pid,
617
.fd = pipefd[0],
618
.next = process_list };
619
// List handling
620
process_list = new_process;
911
new_plugin->pid = pid;
912
new_plugin->fd = pipefd[0];
913
621
914
/* Unblock SIGCHLD so signal handler can be run if this process
622
915
has already completed */
623
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
916
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
624
917
if(ret < 0){
625
918
perror("sigprocmask");
626
919
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);
920
goto fallback;
921
}
922
923
FD_SET(new_plugin->fd, &rfds_all);
924
925
if(maxfd < new_plugin->fd){
926
maxfd = new_plugin->fd;
927
}
643
928
}
644
929
645
930
closedir(dir);
646
931
dir = NULL;
647
648
if (process_list == NULL){
649
fprintf(stderr, "No plugin processes started. Incorrect plugin"
650
" directory?\n");
651
process_list = NULL;
932
free_plugin(getplugin(NULL));
933
934
for(plugin *p = plugin_list; p != NULL; p = p->next){
935
if(p->pid != 0){
936
break;
937
}
938
if(p->next == NULL){
939
fprintf(stderr, "No plugin processes started. Incorrect plugin"
940
" directory?\n");
941
free_plugin_list();
942
}
652
943
}
653
while(process_list){
944
945
/* Main loop while running plugins exist */
946
while(plugin_list){
654
947
fd_set rfds = rfds_all;
655
948
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
656
if (select_ret == -1){
949
if(select_ret == -1){
657
950
perror("select");
658
951
exitstatus = EXIT_FAILURE;
659
goto end;
952
goto fallback;
660
953
}
661
954
/* OK, now either a process completed, or something can be read
662
955
from one of them */
663
for(process *proc = process_list; proc ; proc = proc->next){
956
for(plugin *proc = plugin_list; proc != NULL;){
664
957
/* Is this process completely done? */
665
if(proc->eof and proc->completed){
958
if(proc->completed and proc->eof){
666
959
/* Only accept the plugin output if it exited cleanly */
667
960
if(not WIFEXITED(proc->status)
668
961
or WEXITSTATUS(proc->status) != 0){
669
962
/* Bad exit by plugin */
963
670
964
if(debug){
671
965
if(WIFEXITED(proc->status)){
672
fprintf(stderr, "Plugin %u exited with status %d\n",
673
(unsigned int) (proc->pid),
966
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
967
" status %d\n", proc->name,
968
(intmax_t) (proc->pid),
674
969
WEXITSTATUS(proc->status));
675
} else if(WIFSIGNALED(proc->status)) {
676
fprintf(stderr, "Plugin %u killed by signal %d\n",
677
(unsigned int) (proc->pid),
970
} else if(WIFSIGNALED(proc->status)){
971
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
972
" signal %d\n", proc->name,
973
(intmax_t) (proc->pid),
678
974
WTERMSIG(proc->status));
679
975
} else if(WCOREDUMP(proc->status)){
680
fprintf(stderr, "Plugin %d dumped core\n",
681
(unsigned int) (proc->pid));
976
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
977
" core\n", proc->name, (intmax_t) (proc->pid));
682
978
}
683
979
}
980
684
981
/* Remove the plugin */
685
982
FD_CLR(proc->fd, &rfds_all);
983
686
984
/* Block signal while modifying process_list */
687
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
985
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
688
986
if(ret < 0){
689
987
perror("sigprocmask");
690
988
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
}
989
goto fallback;
990
}
991
992
plugin *next_plugin = proc->next;
993
free_plugin(proc);
994
proc = next_plugin;
995
706
996
/* We are done modifying process list, so unblock signal */
707
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
708
NULL);
997
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
998
NULL);
709
999
if(ret < 0){
710
1000
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;
1001
exitstatus = EXIT_FAILURE;
1002
goto fallback;
1003
}
1004
1005
if(plugin_list == NULL){
1006
break;
1007
}
1008
1009
continue;
718
1010
}
1011
719
1012
/* This process exited nicely, so print its buffer */
720
721
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1013
1014
bool bret = print_out_password(proc->buffer,
1015
proc->buffer_length);
722
1016
if(not bret){
723
1017
perror("print_out_password");
724
1018
exitstatus = EXIT_FAILURE;
725
1019
}
726
goto end;
1020
goto fallback;
727
1021
}
1022
728
1023
/* This process has not completed. Does it have any output? */
729
1024
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
730
1025
/* This process had nothing to say at this time */
1026
proc = proc->next;
731
1027
continue;
732
1028
}
733
1029
/* Before reading, make the process' data buffer large enough */
734
1030
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
735
1031
proc->buffer = realloc(proc->buffer, proc->buffer_size
736
1032
+ (size_t) BUFFER_SIZE);
737
if (proc->buffer == NULL){
1033
if(proc->buffer == NULL){
738
1034
perror("malloc");
739
1035
exitstatus = EXIT_FAILURE;
740
goto end;
1036
goto fallback;
741
1037
}
742
1038
proc->buffer_size += BUFFER_SIZE;
743
1039
}
744
1040
/* Read from the process */
745
ret = read(proc->fd, proc->buffer + proc->buffer_length,
746
BUFFER_SIZE);
747
if(ret < 0){
1041
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1042
BUFFER_SIZE);
1043
if(sret < 0){
748
1044
/* Read error from this process; ignore the error */
1045
proc = proc->next;
749
1046
continue;
750
1047
}
751
if(ret == 0){
1048
if(sret == 0){
752
1049
/* got EOF */
753
1050
proc->eof = true;
754
1051
} else {
755
proc->buffer_length += (size_t) ret;
1052
proc->buffer_length += (size_t) sret;
756
1053
}
757
1054
}
758
1055
}
759
1056
760
1057
761
end:
1058
fallback:
762
1059
763
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
764
/* Fallback if all plugins failed, none are found or an error occured */
1060
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1061
/* Fallback if all plugins failed, none are found or an error
1062
occured */
765
1063
bool bret;
766
1064
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
767
1065
char *passwordbuffer = getpass("Password: ");
768
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1066
size_t len = strlen(passwordbuffer);
1067
/* Strip trailing newline */
1068
if(len > 0 and passwordbuffer[len-1] == '\n'){
1069
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1070
len--;
1071
}
1072
bret = print_out_password(passwordbuffer, len);
769
1073
if(not bret){
770
1074
perror("print_out_password");
771
1075
exitstatus = EXIT_FAILURE;
772
goto end;
773
1076
}
774
1077
}
775
1078
776
1079
/* 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);
1080
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1081
if(ret == -1){
1082
perror("sigaction");
1083
exitstatus = EXIT_FAILURE;
1084
}
1085
1086
if(custom_argv != NULL){
1087
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1088
free(*arg);
1089
}
1090
free(custom_argv);
786
1091
}
787
1092
788
1093
if(dir != NULL){
789
1094
closedir(dir);
790
1095
}
791
1096
792
/* 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");
1097
/* Kill the processes */
1098
for(plugin *p = plugin_list; p != NULL; p = p->next){
1099
if(p->pid != 0){
1100
close(p->fd);
1101
ret = kill(p->pid, SIGTERM);
1102
if(ret == -1 and errno != ESRCH){
1103
/* Set-uid proccesses might not get closed */
1104
perror("kill");
1105
}
800
1106
}
801
free(process_list->buffer);
802
free(process_list);
803
1107
}
804
1108
805
1109
/* Wait for any remaining child processes to terminate */
810
1114
perror("wait");
811
1115
}
812
1116
1117
free_plugin_list();
1118
1119
free(plugindir);
1120
free(argfile);
1121
813
1122
return exitstatus;
814
1123
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0