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- Committer: Björn Påhlsson
- Date: 2008-08-15 20:17:32 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 77.
- Revision ID: belorn@braxen-20080815201732-b7uux3yqs05b3fy9
Added configuration files support for mandos-client
Removed plus argument support for mandos-client
Removed plus argument support for mandos-client
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
mandos-client.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
22
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
27
26
#include <stddef.h> /* size_t, NULL */
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
53
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
54
#include <string.h> /* strsep, strlen(), strcpy(),
55
strcat() */
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,
61
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
61
#include <signal.h> /* struct sigaction, sigemptyset(),
63
62
sigaddset(), sigaction(),
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
64
SIG_UNBLOCK, kill() */
67
65
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
69
66
70
67
#define BUFFER_SIZE 256
71
72
#define PDIR "/lib/mandos/plugins.d"
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
75
const char *argp_program_version = "plugin-runner " VERSION;
68
#define CONFFILE "/conf/conf.d/mandos/client.conf"
69
70
const char *argp_program_version = "mandos-client 1.0";
76
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
77
72
78
typedef struct plugin{
79
char *name; /* can be NULL or any plugin name */
80
char **argv;
81
int argc;
82
char **environ;
83
int envc;
84
bool disabled;
73
struct process;
85
74
86
/* Variables used for running processes*/
75
typedef struct process{
87
76
pid_t pid;
88
77
int fd;
89
78
char *buffer;
90
79
size_t buffer_size;
91
80
size_t buffer_length;
92
81
bool eof;
93
volatile sig_atomic_t completed;
82
bool completed;
94
83
int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
bool disabled;
95
92
struct plugin *next;
96
93
} plugin;
97
94
98
static plugin *plugin_list = NULL;
99
100
/* Gets an existing plugin based on name,
101
or if none is found, creates a new one */
102
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
if((p->name == name)
106
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
107
99
return p;
108
100
}
109
101
}
110
102
/* Create a new plugin */
111
103
plugin *new_plugin = malloc(sizeof(plugin));
112
if(new_plugin == NULL){
113
return NULL;
114
}
115
char *copy_name = NULL;
116
if(name != NULL){
117
copy_name = strdup(name);
118
if(copy_name == NULL){
119
free(new_plugin);
120
return NULL;
121
}
122
}
123
124
*new_plugin = (plugin){ .name = copy_name,
125
.argc = 1,
126
.disabled = false,
127
.next = plugin_list };
128
104
if (new_plugin == NULL){
105
perror("malloc");
106
exit(EXIT_FAILURE);
107
}
108
new_plugin->name = name;
129
109
new_plugin->argv = malloc(sizeof(char *) * 2);
130
if(new_plugin->argv == NULL){
131
free(copy_name);
132
free(new_plugin);
133
return NULL;
110
if (new_plugin->argv == NULL){
111
perror("malloc");
112
exit(EXIT_FAILURE);
134
113
}
135
new_plugin->argv[0] = copy_name;
114
new_plugin->argv[0] = name;
136
115
new_plugin->argv[1] = NULL;
137
138
new_plugin->environ = malloc(sizeof(char *));
139
if(new_plugin->environ == NULL){
140
free(copy_name);
141
free(new_plugin->argv);
142
free(new_plugin);
143
return NULL;
144
}
145
new_plugin->environ[0] = NULL;
146
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
new_plugin->next = *plugin_list;
147
119
/* Append the new plugin to the list */
148
plugin_list = new_plugin;
120
*plugin_list = new_plugin;
149
121
return new_plugin;
150
122
}
151
123
152
/* Helper function for add_argument and add_environment */
153
static bool add_to_char_array(const char *new, char ***array,
154
int *len){
155
/* Resize the pointed-to array to hold one more pointer */
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
158
/* Malloc check */
159
if(*array == NULL){
160
return false;
161
}
162
/* Make a copy of the new string */
163
char *copy = strdup(new);
164
if(copy == NULL){
165
return false;
166
}
167
/* Insert the copy */
168
(*array)[*len] = copy;
169
(*len)++;
170
/* Add a new terminating NULL pointer to the last element */
171
(*array)[*len] = NULL;
172
return true;
173
}
174
175
/* Add to a plugin's argument vector */
176
static bool add_argument(plugin *p, const char *arg){
177
if(p == NULL){
178
return false;
179
}
180
return add_to_char_array(arg, &(p->argv), &(p->argc));
181
}
182
183
/* Add to a plugin's environment */
184
static bool add_environment(plugin *p, const char *def, bool replace){
185
if(p == NULL){
186
return false;
187
}
188
/* namelen = length of name of environment variable */
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
193
/* It already exists */
194
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
197
return false;
198
}
199
*e = new;
200
strcpy(*e, def);
201
}
202
return true;
203
}
204
}
205
return add_to_char_array(def, &(p->environ), &(p->envc));
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;
206
133
}
207
134
208
135
/*
210
137
* Descriptor Flags".
211
138
* *Note File Descriptor Flags:(libc)Descriptor Flags.
212
139
*/
213
static int set_cloexec_flag(int fd){
140
static int set_cloexec_flag(int fd)
141
{
214
142
int ret = fcntl(fd, F_GETFD, 0);
215
143
/* If reading the flags failed, return error indication now. */
216
144
if(ret < 0){
220
148
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
221
149
}
222
150
151
process *process_list = NULL;
223
152
224
/* Mark processes as completed when they exit, and save their exit
153
/* Mark a process as completed when it exits, and save its exit
225
154
status. */
226
static void handle_sigchld(__attribute__((unused)) int sig){
227
int old_errno = errno;
228
while(true){
229
plugin *proc = plugin_list;
230
int status;
231
pid_t pid = waitpid(-1, &status, WNOHANG);
232
if(pid == 0){
233
/* Only still running child processes */
234
break;
235
}
236
if(pid == -1){
237
if(errno == ECHILD){
238
/* No child processes */
239
break;
240
}
241
perror("waitpid");
242
}
243
244
/* A child exited, find it in process_list */
245
while(proc != NULL and proc->pid != pid){
246
proc = proc->next;
247
}
248
if(proc == NULL){
249
/* Process not found in process list */
250
continue;
251
}
252
proc->status = status;
253
proc->completed = 1;
254
}
255
errno = old_errno;
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;
256
172
}
257
173
258
/* Prints out a password to stdout */
259
static bool print_out_password(const char *buffer, size_t length){
174
bool print_out_password(const char *buffer, size_t length){
260
175
ssize_t ret;
176
if(length>0 and buffer[length-1] == '\n'){
177
length--;
178
}
261
179
for(size_t written = 0; written < length; written += (size_t)ret){
262
180
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
181
length - written));
268
186
return true;
269
187
}
270
188
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
189
char ** addcustomargument(char **argv, int *argc, char *arg){
283
190
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
191
if (argv == NULL){
192
*argc = 1;
193
argv = malloc(sizeof(char*) * 2);
194
if(argv == NULL){
195
return NULL;
295
196
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
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;
305
209
}
306
210
307
211
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
212
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
213
const char *conffile = CONFFILE;
310
214
FILE *conffp;
311
215
size_t d_name_len;
312
216
DIR *dir = NULL;
313
217
struct dirent *dirst;
314
218
struct stat st;
315
219
fd_set rfds_all;
316
int ret, numchars, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
220
int ret, maxfd = 0;
319
221
uid_t uid = 65534;
320
222
gid_t gid = 65534;
321
223
bool debug = false;
329
231
/* Establish a signal handler */
330
232
sigemptyset(&sigchld_action.sa_mask);
331
233
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
332
if(ret == -1){
234
if(ret < 0){
333
235
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
335
goto fallback;
236
exit(EXIT_FAILURE);
336
237
}
337
238
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
338
if(ret == -1){
239
if(ret < 0){
339
240
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
341
goto fallback;
241
exit(EXIT_FAILURE);
342
242
}
343
243
344
244
/* The options we understand. */
346
246
{ .name = "global-options", .key = 'g',
347
247
.arg = "OPTION[,OPTION[,...]]",
348
248
.doc = "Options passed to all plugins" },
349
{ .name = "global-env", .key = 'G',
350
.arg = "VAR=value",
351
.doc = "Environment variable passed to all plugins" },
352
249
{ .name = "options-for", .key = 'o',
353
250
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
354
251
.doc = "Options passed only to specified plugin" },
355
{ .name = "env-for", .key = 'E',
356
.arg = "PLUGIN:ENV=value",
357
.doc = "Environment variable passed to specified plugin" },
358
252
{ .name = "disable", .key = 'd',
359
253
.arg = "PLUGIN",
360
254
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
364
255
{ .name = "plugin-dir", .key = 128,
365
256
.arg = "DIRECTORY",
366
257
.doc = "Specify a different plugin directory", .group = 2 },
367
{ .name = "config-file", .key = 129,
368
.arg = "FILE",
369
.doc = "Specify a different configuration file", .group = 2 },
370
{ .name = "userid", .key = 130,
371
.arg = "ID", .flags = 0,
372
.doc = "User ID the plugins will run as", .group = 3 },
373
{ .name = "groupid", .key = 131,
374
.arg = "ID", .flags = 0,
375
.doc = "Group ID the plugins will run as", .group = 3 },
376
{ .name = "debug", .key = 132,
377
.doc = "Debug mode", .group = 4 },
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 },
378
266
{ .name = NULL }
379
267
};
380
268
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
switch(key){
384
case 'g': /* --global-options */
385
if(arg != NULL){
386
char *plugin_option;
387
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
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'){
389
279
continue;
390
280
}
391
if(not add_argument(getplugin(NULL), plugin_option)){
392
perror("add_argument");
393
return ARGP_ERR_UNKNOWN;
394
}
395
}
396
}
397
break;
398
case 'G': /* --global-env */
399
if(arg == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), arg, true)){
403
perror("add_environment");
404
}
405
break;
406
case 'o': /* --options-for */
407
if(arg != NULL){
408
char *plugin_name = strsep(&arg, ":");
409
if(plugin_name[0] == '\0'){
410
break;
411
}
412
char *plugin_option;
413
while((plugin_option = strsep(&arg, ",")) != NULL){
414
if(not add_argument(getplugin(plugin_name), plugin_option)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
417
}
418
}
419
}
420
break;
421
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
425
{
426
char *envdef = strchr(arg, ':');
427
if(envdef == NULL){
428
break;
429
}
430
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
433
}
434
}
435
break;
436
case 'd': /* --disable */
437
if(arg != NULL){
438
plugin *p = getplugin(arg);
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
441
}
442
p->disabled = true;
443
}
444
break;
445
case 'e': /* --enable */
446
if(arg != NULL){
447
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
450
}
451
p->disabled = false;
452
}
453
break;
454
case 128: /* --plugin-dir */
455
free(plugindir);
456
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
460
break;
461
case 129: /* --config-file */
462
/* This is already done by parse_opt_config_file() */
463
break;
464
case 130: /* --userid */
465
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
466
if(ret < 1 or tmpmax != (uid_t)tmpmax
467
or arg[numchars] != '\0'){
468
fprintf(stderr, "Bad user ID number: \"%s\", using %"
469
PRIdMAX "\n", arg, (intmax_t)uid);
470
} else {
471
uid = (uid_t)tmpmax;
472
}
473
break;
474
case 131: /* --groupid */
475
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
476
if(ret < 1 or tmpmax != (gid_t)tmpmax
477
or arg[numchars] != '\0'){
478
fprintf(stderr, "Bad group ID number: \"%s\", using %"
479
PRIdMAX "\n", arg, (intmax_t)gid);
480
} else {
481
gid = (gid_t)tmpmax;
482
}
483
break;
484
case 132: /* --debug */
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:
485
321
debug = true;
486
322
break;
487
/*
488
* When adding more options before this line, remember to also add a
489
* "case" to the "parse_opt_config_file" function below.
490
*/
491
case ARGP_KEY_ARG:
492
/* Cryptsetup always passes an argument, which is an empty
493
string if "none" was specified in /etc/crypttab. So if
494
argument was empty, we ignore it silently. */
495
if(arg[0] != '\0'){
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
497
}
498
break;
499
case ARGP_KEY_END:
500
break;
501
default:
502
return ARGP_ERR_UNKNOWN;
503
}
504
return 0;
505
}
506
507
/* This option parser is the same as parse_opt() above, except it
508
ignores everything but the --config-file option. */
509
error_t parse_opt_config_file(int key, char *arg,
510
__attribute__((unused))
511
struct argp_state *state){
512
switch(key){
513
case 'g': /* --global-options */
514
case 'G': /* --global-env */
515
case 'o': /* --options-for */
516
case 'E': /* --env-for */
517
case 'd': /* --disable */
518
case 'e': /* --enable */
519
case 128: /* --plugin-dir */
520
break;
521
case 129: /* --config-file */
522
free(argfile);
523
argfile = strdup(arg);
524
if(argfile == NULL){
525
perror("strdup");
526
}
527
break;
528
case 130: /* --userid */
529
case 131: /* --groupid */
530
case 132: /* --debug */
531
case ARGP_KEY_ARG:
532
case ARGP_KEY_END:
533
break;
534
default:
535
return ARGP_ERR_UNKNOWN;
536
}
537
return 0;
538
}
539
540
struct argp argp = { .options = options,
541
.parser = parse_opt_config_file,
542
.args_doc = "",
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]",
543
338
.doc = "Mandos plugin runner -- Run plugins" };
544
339
545
/* Parse using parse_opt_config_file() in order to get the custom
546
config file location, if any. */
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
341
if (ret == ARGP_ERR_UNKNOWN){
549
342
fprintf(stderr, "Unknown error while parsing arguments\n");
550
343
exitstatus = EXIT_FAILURE;
551
goto fallback;
344
goto end;
552
345
}
553
554
/* Reset to the normal argument parser */
555
argp.parser = parse_opt;
556
557
/* Open the configfile if available */
558
if(argfile == NULL){
559
conffp = fopen(AFILE, "r");
560
} else {
561
conffp = fopen(argfile, "r");
562
}
346
347
conffp = fopen(conffile, "r");
563
348
if(conffp != NULL){
564
349
char *org_line = NULL;
350
size_t size = 0;
351
ssize_t sret;
565
352
char *p, *arg, *new_arg, *line;
566
size_t size = 0;
567
353
const char whitespace_delims[] = " \r\t\f\v\n";
568
354
const char comment_delim[] = "#";
569
355
570
custom_argc = 1;
571
custom_argv = malloc(sizeof(char*) * 2);
572
if(custom_argv == NULL){
573
perror("malloc");
574
exitstatus = EXIT_FAILURE;
575
goto fallback;
576
}
577
custom_argv[0] = argv[0];
578
custom_argv[1] = NULL;
579
580
/* for each line in the config file, strip whitespace and ignore
581
commented text */
582
356
while(true){
583
357
sret = getline(&org_line, &size, conffp);
584
358
if(sret == -1){
592
366
continue;
593
367
}
594
368
new_arg = strdup(p);
595
if(new_arg == NULL){
596
perror("strdup");
597
exitstatus = EXIT_FAILURE;
598
free(org_line);
599
goto fallback;
600
}
601
602
custom_argc += 1;
603
custom_argv = realloc(custom_argv, sizeof(char *)
604
* ((unsigned int) custom_argc + 1));
605
if(custom_argv == NULL){
606
perror("realloc");
607
exitstatus = EXIT_FAILURE;
608
free(org_line);
609
goto fallback;
610
}
611
custom_argv[custom_argc-1] = new_arg;
612
custom_argv[custom_argc] = NULL;
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
}
613
375
}
614
376
}
615
377
free(org_line);
616
} else {
617
/* Check for harmful errors and go to fallback. Other errors might
618
not affect opening plugins */
619
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
378
} else{
379
/* check for harmfull errors */
380
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
620
381
perror("fopen");
621
382
exitstatus = EXIT_FAILURE;
622
goto fallback;
383
goto end;
623
384
}
624
385
}
625
/* If there was any arguments from configuration file,
626
pass them to parser as command arguments */
386
627
387
if(custom_argv != NULL){
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
0, NULL);
630
if(ret == ARGP_ERR_UNKNOWN){
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){
631
391
fprintf(stderr, "Unknown error while parsing arguments\n");
632
392
exitstatus = EXIT_FAILURE;
633
goto fallback;
393
goto end;
634
394
}
635
395
}
636
396
637
/* Parse actual command line arguments, to let them override the
638
config file */
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
641
fprintf(stderr, "Unknown error while parsing arguments\n");
642
exitstatus = EXIT_FAILURE;
643
goto fallback;
644
}
645
646
397
if(debug){
647
398
for(plugin *p = plugin_list; p != NULL; p=p->next){
648
399
fprintf(stderr, "Plugin: %s has %d arguments\n",
650
401
for(char **a = p->argv; *a != NULL; a++){
651
402
fprintf(stderr, "\tArg: %s\n", *a);
652
403
}
653
fprintf(stderr, "...and %d environment variables\n", p->envc);
654
for(char **a = p->environ; *a != NULL; a++){
655
fprintf(stderr, "\t%s\n", *a);
656
}
657
404
}
658
405
}
659
406
660
/* Strip permissions down to nobody */
407
ret = setuid(uid);
408
if (ret == -1){
409
perror("setuid");
410
}
411
661
412
setgid(gid);
662
if(ret == -1){
413
if (ret == -1){
663
414
perror("setgid");
664
415
}
665
ret = setuid(uid);
666
if(ret == -1){
667
perror("setuid");
668
}
669
670
if(plugindir == NULL){
671
dir = opendir(PDIR);
672
} else {
673
dir = opendir(plugindir);
674
}
675
416
417
dir = opendir(plugindir);
676
418
if(dir == NULL){
677
419
perror("Could not open plugin dir");
678
420
exitstatus = EXIT_FAILURE;
679
goto fallback;
421
goto end;
680
422
}
681
423
682
424
/* Set the FD_CLOEXEC flag on the directory, if possible */
687
429
if(ret < 0){
688
430
perror("set_cloexec_flag");
689
431
exitstatus = EXIT_FAILURE;
690
goto fallback;
432
goto end;
691
433
}
692
434
}
693
435
}
694
436
695
437
FD_ZERO(&rfds_all);
696
438
697
/* Read and execute any executable in the plugin directory*/
698
439
while(true){
699
440
dirst = readdir(dir);
700
441
701
/* All directory entries have been processed */
442
// All directory entries have been processed
702
443
if(dirst == NULL){
703
if(errno == EBADF){
444
if (errno == EBADF){
704
445
perror("readdir");
705
446
exitstatus = EXIT_FAILURE;
706
goto fallback;
447
goto end;
707
448
}
708
449
break;
709
450
}
710
451
711
452
d_name_len = strlen(dirst->d_name);
712
453
713
/* Ignore dotfiles, backup files and other junk */
454
// Ignore dotfiles, backup files and other junk
714
455
{
715
456
bool bad_name = false;
716
457
718
459
719
460
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
720
461
".dpkg-old",
721
".dpkg-bak",
722
462
".dpkg-divert", NULL };
723
463
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
724
464
size_t pre_len = strlen(*pre);
732
472
break;
733
473
}
734
474
}
475
735
476
if(bad_name){
736
477
continue;
737
478
}
479
738
480
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
739
481
size_t suf_len = strlen(*suf);
740
482
if((d_name_len >= suf_len)
753
495
continue;
754
496
}
755
497
}
756
757
char *filename;
758
if(plugindir == NULL){
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
760
} else {
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
762
}
763
if(ret < 0){
764
perror("asprintf");
498
499
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
500
if (filename == NULL){
501
perror("malloc");
765
502
continue;
766
503
}
504
strcpy(filename, plugindir); /* Spurious warning */
505
strcat(filename, "/"); /* Spurious warning */
506
strcat(filename, dirst->d_name); /* Spurious warning */
767
507
768
508
ret = stat(filename, &st);
769
if(ret == -1){
509
if (ret == -1){
770
510
perror("stat");
771
511
free(filename);
772
512
continue;
773
513
}
774
775
/* Ignore non-executable files */
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
514
515
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
777
516
if(debug){
778
517
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
779
518
" with bad type or mode\n", filename);
781
520
free(filename);
782
521
continue;
783
522
}
784
785
plugin *p = getplugin(dirst->d_name);
786
if(p == NULL){
787
perror("getplugin");
788
free(filename);
789
continue;
790
}
791
if(p->disabled){
523
if(getplugin(dirst->d_name, &plugin_list)->disabled){
792
524
if(debug){
793
525
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
794
526
dirst->d_name);
796
528
free(filename);
797
529
continue;
798
530
}
531
plugin *p = getplugin(dirst->d_name, &plugin_list);
799
532
{
800
533
/* Add global arguments to argument list for this plugin */
801
plugin *g = getplugin(NULL);
802
if(g != NULL){
803
for(char **a = g->argv + 1; *a != NULL; a++){
804
if(not add_argument(p, *a)){
805
perror("add_argument");
806
}
807
}
808
/* Add global environment variables */
809
for(char **e = g->environ; *e != NULL; e++){
810
if(not add_environment(p, *e, false)){
811
perror("add_environment");
812
}
813
}
814
}
815
}
816
/* If this plugin has any environment variables, we will call
817
using execve and need to duplicate the environment from this
818
process, too. */
819
if(p->environ[0] != NULL){
820
for(char **e = environ; *e != NULL; e++){
821
if(not add_environment(p, *e, false)){
822
perror("add_environment");
823
}
824
}
825
}
826
827
int pipefd[2];
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];
828
540
ret = pipe(pipefd);
829
if(ret == -1){
541
if (ret == -1){
830
542
perror("pipe");
831
543
exitstatus = EXIT_FAILURE;
832
goto fallback;
544
goto end;
833
545
}
834
/* Ask OS to automatic close the pipe on exec */
835
546
ret = set_cloexec_flag(pipefd[0]);
836
547
if(ret < 0){
837
548
perror("set_cloexec_flag");
838
549
exitstatus = EXIT_FAILURE;
839
goto fallback;
550
goto end;
840
551
}
841
552
ret = set_cloexec_flag(pipefd[1]);
842
553
if(ret < 0){
843
554
perror("set_cloexec_flag");
844
555
exitstatus = EXIT_FAILURE;
845
goto fallback;
556
goto end;
846
557
}
847
558
/* Block SIGCHLD until process is safely in process list */
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
559
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
849
560
if(ret < 0){
850
561
perror("sigprocmask");
851
562
exitstatus = EXIT_FAILURE;
852
goto fallback;
563
goto end;
853
564
}
854
/* Starting a new process to be watched */
565
// Starting a new process to be watched
855
566
pid_t pid = fork();
856
567
if(pid == -1){
857
568
perror("fork");
858
569
exitstatus = EXIT_FAILURE;
859
goto fallback;
570
goto end;
860
571
}
861
572
if(pid == 0){
862
573
/* this is the child process */
865
576
perror("sigaction");
866
577
_exit(EXIT_FAILURE);
867
578
}
868
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
579
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
869
580
if(ret < 0){
870
581
perror("sigprocmask");
871
582
_exit(EXIT_FAILURE);
872
583
}
873
584
874
585
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
875
586
if(ret == -1){
876
587
perror("dup2");
882
593
above and must now close it manually here. */
883
594
closedir(dir);
884
595
}
885
if(p->environ[0] == NULL){
886
if(execv(filename, p->argv) < 0){
887
perror("execv");
888
_exit(EXIT_FAILURE);
889
}
890
} else {
891
if(execve(filename, p->argv, p->environ) < 0){
892
perror("execve");
893
_exit(EXIT_FAILURE);
894
}
596
if(execv(filename, p->argv) < 0){
597
perror("execv");
598
_exit(EXIT_FAILURE);
895
599
}
896
600
/* no return */
897
601
}
898
/* Parent process */
899
close(pipefd[1]); /* Close unused write end of pipe */
602
/* parent process */
900
603
free(filename);
901
plugin *new_plugin = getplugin(dirst->d_name);
902
if(new_plugin == NULL){
903
perror("getplugin");
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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);
905
609
if(ret < 0){
906
perror("sigprocmask");
610
perror("sigprocmask");
907
611
}
908
612
exitstatus = EXIT_FAILURE;
909
goto fallback;
613
goto end;
910
614
}
911
615
912
new_plugin->pid = pid;
913
new_plugin->fd = pipefd[0];
914
616
*new_process = (struct process){ .pid = pid,
617
.fd = pipefd[0],
618
.next = process_list };
619
// List handling
620
process_list = new_process;
915
621
/* Unblock SIGCHLD so signal handler can be run if this process
916
622
has already completed */
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
623
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
918
624
if(ret < 0){
919
625
perror("sigprocmask");
920
626
exitstatus = EXIT_FAILURE;
921
goto fallback;
922
}
923
924
FD_SET(new_plugin->fd, &rfds_all);
925
926
if(maxfd < new_plugin->fd){
927
maxfd = new_plugin->fd;
928
}
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);
929
643
}
930
644
931
645
closedir(dir);
932
646
dir = NULL;
933
free_plugin(getplugin(NULL));
934
935
for(plugin *p = plugin_list; p != NULL; p = p->next){
936
if(p->pid != 0){
937
break;
938
}
939
if(p->next == NULL){
940
fprintf(stderr, "No plugin processes started. Incorrect plugin"
941
" directory?\n");
942
free_plugin_list();
943
}
647
648
if (process_list == NULL){
649
fprintf(stderr, "No plugin processes started. Incorrect plugin"
650
" directory?\n");
651
process_list = NULL;
944
652
}
945
946
/* Main loop while running plugins exist */
947
while(plugin_list){
653
while(process_list){
948
654
fd_set rfds = rfds_all;
949
655
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
950
if(select_ret == -1){
656
if (select_ret == -1){
951
657
perror("select");
952
658
exitstatus = EXIT_FAILURE;
953
goto fallback;
659
goto end;
954
660
}
955
661
/* OK, now either a process completed, or something can be read
956
662
from one of them */
957
for(plugin *proc = plugin_list; proc != NULL;){
663
for(process *proc = process_list; proc ; proc = proc->next){
958
664
/* Is this process completely done? */
959
if(proc->completed and proc->eof){
665
if(proc->eof and proc->completed){
960
666
/* Only accept the plugin output if it exited cleanly */
961
667
if(not WIFEXITED(proc->status)
962
668
or WEXITSTATUS(proc->status) != 0){
963
669
/* Bad exit by plugin */
964
965
670
if(debug){
966
671
if(WIFEXITED(proc->status)){
967
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
968
" status %d\n", proc->name,
969
(intmax_t) (proc->pid),
672
fprintf(stderr, "Plugin %u exited with status %d\n",
673
(unsigned int) (proc->pid),
970
674
WEXITSTATUS(proc->status));
971
} else if(WIFSIGNALED(proc->status)){
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
973
" signal %d\n", proc->name,
974
(intmax_t) (proc->pid),
675
} else if(WIFSIGNALED(proc->status)) {
676
fprintf(stderr, "Plugin %u killed by signal %d\n",
677
(unsigned int) (proc->pid),
975
678
WTERMSIG(proc->status));
976
679
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
978
" core\n", proc->name, (intmax_t) (proc->pid));
680
fprintf(stderr, "Plugin %d dumped core\n",
681
(unsigned int) (proc->pid));
979
682
}
980
683
}
981
982
684
/* Remove the plugin */
983
685
FD_CLR(proc->fd, &rfds_all);
984
985
686
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
687
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
987
688
if(ret < 0){
988
689
perror("sigprocmask");
989
690
exitstatus = EXIT_FAILURE;
990
goto fallback;
991
}
992
993
plugin *next_plugin = proc->next;
994
free_plugin(proc);
995
proc = next_plugin;
996
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
}
997
706
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
707
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
708
NULL);
1000
709
if(ret < 0){
1001
710
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1003
goto fallback;
1004
}
1005
1006
if(plugin_list == NULL){
1007
break;
1008
}
1009
1010
continue;
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;
1011
718
}
1012
1013
719
/* This process exited nicely, so print its buffer */
1014
1015
bool bret = print_out_password(proc->buffer,
1016
proc->buffer_length);
720
721
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1017
722
if(not bret){
1018
723
perror("print_out_password");
1019
724
exitstatus = EXIT_FAILURE;
1020
725
}
1021
goto fallback;
726
goto end;
1022
727
}
1023
1024
728
/* This process has not completed. Does it have any output? */
1025
729
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1026
730
/* This process had nothing to say at this time */
1027
proc = proc->next;
1028
731
continue;
1029
732
}
1030
733
/* Before reading, make the process' data buffer large enough */
1031
734
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1032
735
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
736
+ (size_t) BUFFER_SIZE);
1034
if(proc->buffer == NULL){
737
if (proc->buffer == NULL){
1035
738
perror("malloc");
1036
739
exitstatus = EXIT_FAILURE;
1037
goto fallback;
740
goto end;
1038
741
}
1039
742
proc->buffer_size += BUFFER_SIZE;
1040
743
}
1041
744
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1044
if(sret < 0){
745
ret = read(proc->fd, proc->buffer + proc->buffer_length,
746
BUFFER_SIZE);
747
if(ret < 0){
1045
748
/* Read error from this process; ignore the error */
1046
proc = proc->next;
1047
749
continue;
1048
750
}
1049
if(sret == 0){
751
if(ret == 0){
1050
752
/* got EOF */
1051
753
proc->eof = true;
1052
754
} else {
1053
proc->buffer_length += (size_t) sret;
755
proc->buffer_length += (size_t) ret;
1054
756
}
1055
757
}
1056
758
}
1057
759
1058
760
1059
fallback:
761
end:
1060
762
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1062
/* Fallback if all plugins failed, none are found or an error
1063
occured */
763
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
764
/* Fallback if all plugins failed, none are found or an error occured */
1064
765
bool bret;
1065
766
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1066
767
char *passwordbuffer = getpass("Password: ");
1067
size_t len = strlen(passwordbuffer);
1068
/* Strip trailing newline */
1069
if(len > 0 and passwordbuffer[len-1] == '\n'){
1070
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1071
len--;
1072
}
1073
bret = print_out_password(passwordbuffer, len);
768
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1074
769
if(not bret){
1075
770
perror("print_out_password");
1076
771
exitstatus = EXIT_FAILURE;
772
goto end;
1077
773
}
1078
774
}
1079
775
1080
776
/* Restore old signal handler */
1081
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
if(ret == -1){
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1085
}
1086
1087
if(custom_argv != NULL){
1088
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1089
free(*arg);
1090
}
1091
free(custom_argv);
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);
1092
786
}
1093
787
1094
788
if(dir != NULL){
1095
789
closedir(dir);
1096
790
}
1097
791
1098
/* Kill the processes */
1099
for(plugin *p = plugin_list; p != NULL; p = p->next){
1100
if(p->pid != 0){
1101
close(p->fd);
1102
ret = kill(p->pid, SIGTERM);
1103
if(ret == -1 and errno != ESRCH){
1104
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1106
}
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");
1107
800
}
801
free(process_list->buffer);
802
free(process_list);
1108
803
}
1109
804
1110
805
/* Wait for any remaining child processes to terminate */
1115
810
perror("wait");
1116
811
}
1117
812
1118
free_plugin_list();
1119
1120
free(plugindir);
1121
free(argfile);
1122
1123
813
return exitstatus;
1124
814
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0