1 /* 2 * Copyright (c) 2009 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Alex Hornung <ahornung@gmail.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <stdio.h> 36 #include <stdarg.h> 37 #include <string.h> 38 #include <unistd.h> 39 #include <errno.h> 40 #include <err.h> 41 42 #include <libcryptsetup.h> 43 44 #define iswhitespace(X) ((((X) == ' ') || ((X) == '\t'))?1:0) 45 46 #define CRYPTDISKS_START 1 47 #define CRYPTDISKS_STOP 2 48 49 static int line_no = 1; 50 51 static int yesDialog(char *msg __unused) 52 { 53 return 1; 54 } 55 56 static void cmdLineLog(int level __unused, char *msg) 57 { 58 printf("%s", msg); 59 } 60 61 static struct interface_callbacks cmd_icb = { 62 .yesDialog = yesDialog, 63 .log = cmdLineLog, 64 }; 65 66 static void 67 syntax_error(const char *fmt, ...) 68 { 69 char buf[1024]; 70 va_list ap; 71 72 va_start(ap, fmt); 73 vsnprintf(buf, sizeof(buf), fmt, ap); 74 va_end(ap); 75 errx(1, "crypttab: syntax error on line %d: %s\n", line_no, buf); 76 } 77 78 79 static int 80 entry_check_num_args(char **tokens, int num) 81 { 82 int i; 83 84 for (i = 0; tokens[i] != NULL; i++) 85 ; 86 87 if (i < num) { 88 syntax_error("at least %d tokens were expected but only %d were found", num, i); 89 return 1; 90 } 91 return 0; 92 } 93 94 static int 95 entry_parser(char **tokens, int type) 96 { 97 struct crypt_options co; 98 int r, error; 99 100 if (entry_check_num_args(tokens, 2) != 0) 101 return 1; 102 103 bzero(&co, sizeof(co)); 104 105 co.icb = &cmd_icb; 106 co.name = tokens[0]; 107 co.device = tokens[1]; 108 109 error = crypt_isLuks(&co); 110 if (error) { 111 printf("crypttab: line %d: device %s is not a luks device\n", 112 line_no, co.device); 113 return 1; 114 } 115 116 if (type == CRYPTDISKS_STOP) { 117 /* Check if the device is active */ 118 r = crypt_query_device(&co); 119 120 /* If r > 0, then the device is active */ 121 if (r <= 0) 122 return 0; 123 124 /* Actually close the device */ 125 crypt_remove_device(&co); 126 } else if (type == CRYPTDISKS_START) { 127 if ((tokens[2] != NULL) && (strcmp(tokens[2], "none") != 0)) { 128 /* We got a keyfile */ 129 co.key_file = tokens[2]; 130 } 131 132 /* Open the device */ 133 crypt_luksOpen(&co); 134 } 135 136 return 0; 137 } 138 139 static int 140 process_line(FILE* fd, int type) 141 { 142 char buffer[4096]; 143 char *tokens[256]; 144 int c, n, i = 0; 145 int quote = 0; 146 int ret = 0; 147 148 while (((c = fgetc(fd)) != EOF) && (c != '\n')) { 149 buffer[i++] = (char)c; 150 if (i == (sizeof(buffer) -1)) 151 break; 152 } 153 buffer[i] = '\0'; 154 155 if (feof(fd) || ferror(fd)) 156 ret = 1; 157 c = 0; 158 while (((buffer[c] == ' ') || (buffer[c] == '\t')) && (c < i)) c++; 159 /* 160 * If this line effectively (after indentation) begins with the comment 161 * character #, we ignore the rest of the line. 162 */ 163 if (buffer[c] == '#') 164 return 0; 165 166 tokens[0] = &buffer[c]; 167 for (n = 1; c < i; c++) { 168 if (buffer[c] == '"') { 169 quote = !quote; 170 if (quote) { 171 if ((c >= 1) && (&buffer[c] != tokens[n-1])) { 172 syntax_error("stray opening quote not at beginning of token"); 173 /* NOTREACHED */ 174 } 175 tokens[n-1] = &buffer[c+1]; 176 } else { 177 if ((c < i-1) && (!iswhitespace(buffer[c+1]))) { 178 syntax_error("stray closing quote not at end of token"); 179 /* NOTREACHED */ 180 } 181 buffer[c] = '\0'; 182 } 183 } 184 185 if (quote) { 186 continue; 187 } 188 189 if ((buffer[c] == ' ') || (buffer[c] == '\t')) { 190 buffer[c++] = '\0'; 191 while ((iswhitespace(buffer[c])) && (c < i)) c++; 192 tokens[n++] = &buffer[c--]; 193 } 194 } 195 tokens[n] = NULL; 196 197 /* 198 * If there are not enough arguments for any function or it is 199 * a line full of whitespaces, we just return here. Or if a 200 * quote wasn't closed. 201 */ 202 if ((quote) || (n < 2) || (tokens[0][0] == '\0')) 203 return ret; 204 205 entry_parser(tokens, type); 206 207 return ret; 208 } 209 210 211 int 212 main(int argc, char *argv[]) 213 { 214 FILE *fd; 215 int ch, start = 0, stop = 0; 216 217 while ((ch = getopt(argc, argv, "01")) != -1) { 218 switch (ch) { 219 case '1': 220 start = 1; 221 break; 222 case '0': 223 stop = 1; 224 break; 225 default: 226 break; 227 } 228 } 229 230 argc -= optind; 231 argv += optind; 232 233 if ((start && stop) || (!start && !stop)) 234 errx(1, "please specify exactly one of -0 and -1"); 235 236 fd = fopen("/etc/crypttab", "r"); 237 if (fd == NULL) 238 err(1, "fopen"); 239 /* NOTREACHED */ 240 241 while (process_line(fd, (start) ? CRYPTDISKS_START : CRYPTDISKS_STOP) == 0) 242 ++line_no; 243 244 fclose(fd); 245 return 0; 246 } 247