Eric Paris | 48681bb | 2011-08-03 11:40:47 -0400 | [diff] [blame] | 1 | #define _GNU_SOURCE |
| 2 | #include <sys/inotify.h> |
| 3 | #include <errno.h> |
| 4 | #include <stdio.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <string.h> |
| 7 | #include <unistd.h> |
| 8 | #include <ctype.h> |
| 9 | #include <sys/types.h> |
| 10 | #include <syslog.h> |
Stephen Smalley | 4480129 | 2016-11-08 14:21:10 -0500 | [diff] [blame] | 11 | #include "restore.h" |
Eric Paris | 48681bb | 2011-08-03 11:40:47 -0400 | [diff] [blame] | 12 | #include <glob.h> |
| 13 | #include <libgen.h> |
| 14 | #include <sys/stat.h> |
| 15 | #include <string.h> |
| 16 | #include <stdio.h> |
| 17 | #include <fcntl.h> |
| 18 | #include <selinux/selinux.h> |
| 19 | #include "restorecond.h" |
| 20 | #include "stringslist.h" |
| 21 | #include "utmpwatcher.h" |
| 22 | |
Jason Zaman | 178c552 | 2018-05-17 12:45:05 +0800 | [diff] [blame] | 23 | #ifndef GLOB_TILDE |
| 24 | #define GLOB_TILDE 0 |
| 25 | #endif |
| 26 | |
| 27 | #ifndef GLOB_BRACE |
| 28 | #define GLOB_BRACE 0 |
| 29 | #endif |
| 30 | |
Eric Paris | 48681bb | 2011-08-03 11:40:47 -0400 | [diff] [blame] | 31 | /* size of the event structure, not counting name */ |
| 32 | #define EVENT_SIZE (sizeof (struct inotify_event)) |
| 33 | /* reasonable guess as to size of 1024 events */ |
| 34 | #define BUF_LEN (1024 * (EVENT_SIZE + 16)) |
| 35 | |
Eric Paris | 48681bb | 2011-08-03 11:40:47 -0400 | [diff] [blame] | 36 | struct watchList { |
| 37 | struct watchList *next; |
| 38 | int wd; |
| 39 | char *dir; |
| 40 | struct stringsList *files; |
| 41 | }; |
| 42 | struct watchList *firstDir = NULL; |
| 43 | |
Nicolas Iooss | c4a4a1a | 2014-09-14 23:41:49 +0200 | [diff] [blame] | 44 | int watch_list_isempty(void) { |
Eric Paris | 48681bb | 2011-08-03 11:40:47 -0400 | [diff] [blame] | 45 | return firstDir == NULL; |
| 46 | } |
| 47 | |
| 48 | void watch_list_add(int fd, const char *path) |
| 49 | { |
| 50 | struct watchList *ptr = NULL; |
| 51 | size_t i = 0; |
| 52 | struct watchList *prev = NULL; |
| 53 | glob_t globbuf; |
| 54 | char *x = strdup(path); |
| 55 | if (!x) exitApp("Out of Memory"); |
| 56 | char *file = basename(x); |
| 57 | char *dir = dirname(x); |
| 58 | ptr = firstDir; |
Richard Haines | e053128 | 2016-07-26 09:45:16 +0100 | [diff] [blame] | 59 | int len; |
Eric Paris | 48681bb | 2011-08-03 11:40:47 -0400 | [diff] [blame] | 60 | |
| 61 | globbuf.gl_offs = 1; |
| 62 | if (glob(path, |
| 63 | GLOB_TILDE | GLOB_PERIOD, |
| 64 | NULL, |
| 65 | &globbuf) >= 0) { |
Richard Haines | e053128 | 2016-07-26 09:45:16 +0100 | [diff] [blame] | 66 | for (i = 0; i < globbuf.gl_pathc; i++) { |
| 67 | len = strlen(globbuf.gl_pathv[i]) - 2; |
| 68 | if (len > 0 && |
| 69 | strcmp(&globbuf.gl_pathv[i][len--], "/.") == 0) |
| 70 | continue; |
| 71 | if (len > 0 && |
| 72 | strcmp(&globbuf.gl_pathv[i][len], "/..") == 0) |
| 73 | continue; |
| 74 | selinux_restorecon(globbuf.gl_pathv[i], |
| 75 | r_opts.restorecon_flags); |
Eric Paris | 48681bb | 2011-08-03 11:40:47 -0400 | [diff] [blame] | 76 | } |
| 77 | globfree(&globbuf); |
| 78 | } |
| 79 | |
| 80 | while (ptr != NULL) { |
| 81 | if (strcmp(dir, ptr->dir) == 0) { |
| 82 | strings_list_add(&ptr->files, file); |
| 83 | goto end; |
| 84 | } |
| 85 | prev = ptr; |
| 86 | ptr = ptr->next; |
| 87 | } |
| 88 | ptr = calloc(1, sizeof(struct watchList)); |
| 89 | |
| 90 | if (!ptr) exitApp("Out of Memory"); |
| 91 | |
| 92 | ptr->wd = inotify_add_watch(fd, dir, IN_CREATE | IN_MOVED_TO); |
| 93 | if (ptr->wd == -1) { |
| 94 | free(ptr); |
| 95 | if (! run_as_user) |
| 96 | syslog(LOG_ERR, "Unable to watch (%s) %s\n", |
| 97 | path, strerror(errno)); |
| 98 | goto end; |
| 99 | } |
| 100 | |
| 101 | ptr->dir = strdup(dir); |
| 102 | if (!ptr->dir) |
| 103 | exitApp("Out of Memory"); |
| 104 | |
| 105 | strings_list_add(&ptr->files, file); |
| 106 | if (prev) |
| 107 | prev->next = ptr; |
| 108 | else |
| 109 | firstDir = ptr; |
| 110 | |
| 111 | if (debug_mode) |
| 112 | printf("%d: Dir=%s, File=%s\n", ptr->wd, ptr->dir, file); |
| 113 | |
| 114 | end: |
| 115 | free(x); |
| 116 | return; |
| 117 | } |
| 118 | |
| 119 | /* |
| 120 | A file was in a direcroty has been created. This function checks to |
| 121 | see if it is one that we are watching. |
| 122 | */ |
| 123 | |
| 124 | int watch_list_find(int wd, const char *file) |
| 125 | { |
| 126 | struct watchList *ptr = NULL; |
Richard Haines | e053128 | 2016-07-26 09:45:16 +0100 | [diff] [blame] | 127 | |
Eric Paris | 48681bb | 2011-08-03 11:40:47 -0400 | [diff] [blame] | 128 | ptr = firstDir; |
Richard Haines | e053128 | 2016-07-26 09:45:16 +0100 | [diff] [blame] | 129 | |
Eric Paris | 48681bb | 2011-08-03 11:40:47 -0400 | [diff] [blame] | 130 | if (debug_mode) |
| 131 | printf("%d: File=%s\n", wd, file); |
| 132 | while (ptr != NULL) { |
| 133 | if (ptr->wd == wd) { |
| 134 | int exact=0; |
| 135 | if (strings_list_find(ptr->files, file, &exact) == 0) { |
| 136 | char *path = NULL; |
| 137 | if (asprintf(&path, "%s/%s", ptr->dir, file) < |
| 138 | 0) |
| 139 | exitApp("Error allocating memory."); |
| 140 | |
Richard Haines | e053128 | 2016-07-26 09:45:16 +0100 | [diff] [blame] | 141 | selinux_restorecon(path, |
| 142 | r_opts.restorecon_flags); |
Eric Paris | 48681bb | 2011-08-03 11:40:47 -0400 | [diff] [blame] | 143 | free(path); |
| 144 | return 0; |
| 145 | } |
| 146 | if (debug_mode) |
| 147 | strings_list_print(ptr->files); |
| 148 | |
| 149 | /* Not found in this directory */ |
| 150 | return -1; |
| 151 | } |
| 152 | ptr = ptr->next; |
| 153 | } |
| 154 | /* Did not find a directory */ |
| 155 | return -1; |
| 156 | } |
| 157 | |
| 158 | void watch_list_free(int fd) |
| 159 | { |
| 160 | struct watchList *ptr = NULL; |
| 161 | struct watchList *prev = NULL; |
| 162 | ptr = firstDir; |
| 163 | |
| 164 | while (ptr != NULL) { |
| 165 | inotify_rm_watch(fd, ptr->wd); |
| 166 | strings_list_free(ptr->files); |
| 167 | free(ptr->dir); |
| 168 | prev = ptr; |
| 169 | ptr = ptr->next; |
| 170 | free(prev); |
| 171 | } |
| 172 | firstDir = NULL; |
| 173 | } |
| 174 | |
| 175 | /* |
| 176 | Inotify watch loop |
| 177 | */ |
| 178 | int watch(int fd, const char *watch_file) |
| 179 | { |
| 180 | char buf[BUF_LEN]; |
| 181 | int len, i = 0; |
| 182 | if (firstDir == NULL) return 0; |
| 183 | |
| 184 | len = read(fd, buf, BUF_LEN); |
| 185 | if (len < 0) { |
| 186 | if (terminate == 0) { |
| 187 | syslog(LOG_ERR, "Read error (%s)", strerror(errno)); |
| 188 | return 0; |
| 189 | } |
Vit Mojzis | aa115d0 | 2017-01-04 10:59:07 +0100 | [diff] [blame] | 190 | syslog(LOG_INFO, "terminated"); |
Eric Paris | 48681bb | 2011-08-03 11:40:47 -0400 | [diff] [blame] | 191 | return -1; |
| 192 | } else if (!len) |
| 193 | /* BUF_LEN too small? */ |
| 194 | return -1; |
| 195 | while (i < len) { |
| 196 | struct inotify_event *event; |
| 197 | event = (struct inotify_event *)&buf[i]; |
| 198 | if (debug_mode) |
| 199 | printf("wd=%d mask=%u cookie=%u len=%u\n", |
| 200 | event->wd, event->mask, |
| 201 | event->cookie, event->len); |
Martin Orr | 72ea5de | 2012-03-26 17:31:25 +0200 | [diff] [blame] | 202 | if (event->mask & ~IN_IGNORED) { |
| 203 | if (event->wd == master_wd) |
Eric Paris | 48681bb | 2011-08-03 11:40:47 -0400 | [diff] [blame] | 204 | read_config(fd, watch_file); |
Martin Orr | 72ea5de | 2012-03-26 17:31:25 +0200 | [diff] [blame] | 205 | else { |
| 206 | switch (utmpwatcher_handle(fd, event->wd)) { |
| 207 | case -1: /* Message was not for utmpwatcher */ |
| 208 | if (event->len) |
| 209 | watch_list_find(event->wd, event->name); |
| 210 | break; |
| 211 | case 1: /* utmp has changed need to reload */ |
| 212 | read_config(fd, watch_file); |
| 213 | break; |
Eric Paris | 48681bb | 2011-08-03 11:40:47 -0400 | [diff] [blame] | 214 | |
Martin Orr | 72ea5de | 2012-03-26 17:31:25 +0200 | [diff] [blame] | 215 | default: /* No users logged in or out */ |
| 216 | break; |
| 217 | } |
Eric Paris | 48681bb | 2011-08-03 11:40:47 -0400 | [diff] [blame] | 218 | } |
| 219 | } |
| 220 | |
| 221 | i += EVENT_SIZE + event->len; |
| 222 | } |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | static void process_config(int fd, FILE * cfg) |
| 227 | { |
| 228 | char *line_buf = NULL; |
| 229 | size_t len = 0; |
| 230 | |
| 231 | while (getline(&line_buf, &len, cfg) > 0) { |
| 232 | char *buffer = line_buf; |
| 233 | while (isspace(*buffer)) |
| 234 | buffer++; |
| 235 | if (buffer[0] == '#') |
| 236 | continue; |
| 237 | int l = strlen(buffer) - 1; |
| 238 | if (l <= 0) |
| 239 | continue; |
| 240 | buffer[l] = 0; |
| 241 | if (buffer[0] == '~') { |
| 242 | if (run_as_user) { |
| 243 | char *ptr=NULL; |
Dan Walsh | 9961ca6 | 2011-08-09 09:58:53 -0400 | [diff] [blame] | 244 | if (asprintf(&ptr, "%s%s", homedir, &buffer[1]) < 0) |
| 245 | exitApp("Error allocating memory."); |
| 246 | |
Eric Paris | 48681bb | 2011-08-03 11:40:47 -0400 | [diff] [blame] | 247 | watch_list_add(fd, ptr); |
| 248 | free(ptr); |
| 249 | } else { |
| 250 | utmpwatcher_add(fd, &buffer[1]); |
| 251 | } |
| 252 | } else { |
| 253 | watch_list_add(fd, buffer); |
| 254 | } |
| 255 | } |
| 256 | free(line_buf); |
| 257 | } |
| 258 | |
| 259 | /* |
| 260 | Read config file ignoring Comment lines |
| 261 | Files specified one per line. Files with "~" will be expanded to the logged in users |
| 262 | homedirs. |
| 263 | */ |
| 264 | |
| 265 | void read_config(int fd, const char *watch_file_path) |
| 266 | { |
| 267 | |
| 268 | FILE *cfg = NULL; |
| 269 | if (debug_mode) |
| 270 | printf("Read Config\n"); |
| 271 | |
| 272 | watch_list_free(fd); |
| 273 | |
| 274 | cfg = fopen(watch_file_path, "r"); |
| 275 | if (!cfg){ |
| 276 | perror(watch_file_path); |
| 277 | exitApp("Error reading config file"); |
| 278 | } |
| 279 | process_config(fd, cfg); |
| 280 | fclose(cfg); |
| 281 | |
| 282 | inotify_rm_watch(fd, master_wd); |
| 283 | master_wd = |
| 284 | inotify_add_watch(fd, watch_file_path, IN_MOVED_FROM | IN_MODIFY); |
| 285 | if (master_wd == -1) |
| 286 | exitApp("Error watching config file."); |
| 287 | } |