| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Common code for Pixie client and server (Unix-specific) |
| 4 | * |
| 5 | * (c) 1999 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of Catacomb. |
| 11 | * |
| 12 | * Catacomb is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU Library General Public License as |
| 14 | * published by the Free Software Foundation; either version 2 of the |
| 15 | * License, or (at your option) any later version. |
| 16 | * |
| 17 | * Catacomb is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU Library General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU Library General Public |
| 23 | * License along with Catacomb; if not, write to the Free |
| 24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 25 | * MA 02111-1307, USA. |
| 26 | */ |
| 27 | |
| 28 | /*----- Header files ------------------------------------------------------*/ |
| 29 | |
| 30 | #include <errno.h> |
| 31 | #include <stddef.h> |
| 32 | #include <stdio.h> |
| 33 | #include <stdlib.h> |
| 34 | #include <string.h> |
| 35 | |
| 36 | #include <sys/types.h> |
| 37 | #include <unistd.h> |
| 38 | #include <fcntl.h> |
| 39 | #include <termios.h> |
| 40 | #include <pwd.h> |
| 41 | |
| 42 | #include <sys/socket.h> |
| 43 | #include <sys/un.h> |
| 44 | |
| 45 | #include <mLib/alloc.h> |
| 46 | #include <mLib/dstr.h> |
| 47 | #include <mLib/str.h> |
| 48 | |
| 49 | #include "pixie.h" |
| 50 | |
| 51 | /*----- Main code ---------------------------------------------------------*/ |
| 52 | |
| 53 | /* --- @pixie_address@ --- * |
| 54 | * |
| 55 | * Arguments: @const char *sock@ = pointer to socket name |
| 56 | * @size_t *psz@ = where to write the address size |
| 57 | * |
| 58 | * Returns: Pointer to filled-in Unix-domain socket address. |
| 59 | * |
| 60 | * Use: Returns a Unix-domain socket address to use to find the |
| 61 | * passphrase pixie. |
| 62 | */ |
| 63 | |
| 64 | struct sockaddr_un *pixie_address(const char *sock, size_t *psz) |
| 65 | { |
| 66 | dstr d = DSTR_INIT; |
| 67 | |
| 68 | /* --- Get the default socket path if none specified --- */ |
| 69 | |
| 70 | if (!sock) |
| 71 | sock = getenv("CATACOMB_PIXIE_SOCKET"); |
| 72 | if (!sock) |
| 73 | sock = "%h/.catacomb/pixie"; |
| 74 | |
| 75 | /* --- Substitute interesting sequences in the path --- */ |
| 76 | |
| 77 | { |
| 78 | const char *q, *qq; |
| 79 | |
| 80 | q = sock; |
| 81 | for (;;) { |
| 82 | qq = strchr(q, '%'); |
| 83 | if (!qq || !qq[1]) { |
| 84 | DPUTS(&d, q); |
| 85 | break; |
| 86 | } |
| 87 | DPUTM(&d, q, qq - q); |
| 88 | q = qq + 1; |
| 89 | switch (*q) { |
| 90 | case 'u': |
| 91 | qq = getenv("USER"); |
| 92 | if (!qq) |
| 93 | qq = getenv("LOGNAME"); |
| 94 | if (!qq) { |
| 95 | struct passwd *pw = getpwuid(getuid()); |
| 96 | if (pw) |
| 97 | qq = pw->pw_name; |
| 98 | else |
| 99 | qq = "<unknown>"; |
| 100 | } |
| 101 | DPUTS(&d, qq); |
| 102 | break; |
| 103 | case 'h': |
| 104 | qq = getenv("HOME"); |
| 105 | if (!qq) { |
| 106 | struct passwd *pw = getpwuid(getuid()); |
| 107 | if (pw) |
| 108 | qq = pw->pw_dir; |
| 109 | else |
| 110 | qq = "<unknown>"; |
| 111 | } |
| 112 | DPUTS(&d, qq); |
| 113 | break; |
| 114 | default: |
| 115 | DPUTC(&d, '%'); |
| 116 | DPUTC(&d, *q); |
| 117 | break; |
| 118 | } |
| 119 | q++; |
| 120 | } |
| 121 | DPUTZ(&d); |
| 122 | } |
| 123 | |
| 124 | /* --- Allocate and initialize the socket address --- */ |
| 125 | |
| 126 | { |
| 127 | struct sockaddr_un *sun; |
| 128 | size_t bsz = offsetof(struct sockaddr_un, sun_path); |
| 129 | *psz = bsz + d.len + 1; |
| 130 | sun = xmalloc(bsz + d.len + 1); |
| 131 | memset(sun, 0, bsz); |
| 132 | sun->sun_family = AF_UNIX; |
| 133 | memcpy(sun->sun_path, d.buf, d.len + 1); |
| 134 | dstr_destroy(&d); |
| 135 | return (sun); |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | /* --- @pixie_fdline@ --- * |
| 140 | * |
| 141 | * Arguments: @int fd@ = file descriptor to read from |
| 142 | * @char *buf@ = pointer to buffer |
| 143 | * @size_t sz@ = size of buffer |
| 144 | * |
| 145 | * Returns: --- |
| 146 | * |
| 147 | * Use: Reads a line from a file descriptor. The read is done one |
| 148 | * character at a time. If the entire line won't fit, the end |
| 149 | * is truncated. The line is null terminated. |
| 150 | */ |
| 151 | |
| 152 | void pixie_fdline(int fd, char *buf, size_t sz) |
| 153 | { |
| 154 | char *p = buf; |
| 155 | char *q = p + sz - 1; |
| 156 | |
| 157 | for (;;) { |
| 158 | char c; |
| 159 | if (read(fd, &c, 1) < 1) |
| 160 | break; |
| 161 | if (c == '\n') |
| 162 | break; |
| 163 | if (p < q) |
| 164 | *p++ = c; |
| 165 | } |
| 166 | *p = 0; |
| 167 | } |
| 168 | |
| 169 | /* --- @pixie_getpass@ --- * |
| 170 | * |
| 171 | * Arguments: @const char *prompt@ = pointer to prompt string |
| 172 | * @char *buf@ = pointer to buffer |
| 173 | * @size_t sz@ = size of buffer |
| 174 | * |
| 175 | * Returns: Zero if it worked OK, nonzero otherwise. |
| 176 | * |
| 177 | * Use: Reads a passphrase from the terminal or some other requested |
| 178 | * source. |
| 179 | */ |
| 180 | |
| 181 | int pixie_getpass(const char *prompt, char *buf, size_t sz) |
| 182 | { |
| 183 | const char *pfd = getenv("CATACOMB_PASSPHRASE_FD"); |
| 184 | struct termios ta; |
| 185 | struct termios ota; |
| 186 | char nl = '\n'; |
| 187 | int fd = 0; |
| 188 | |
| 189 | /* --- See whether a terminal is what's wanted --- */ |
| 190 | |
| 191 | if (pfd) { |
| 192 | fd = atoi(pfd); |
| 193 | pixie_fdline(fd, buf, sz); |
| 194 | } else { |
| 195 | if ((fd = open("/dev/tty", O_RDWR)) < 0) |
| 196 | goto fail_0; |
| 197 | if (tcgetattr(fd, &ta) < 0) |
| 198 | goto fail_1; |
| 199 | ota = ta; |
| 200 | ta.c_lflag &= ~(ECHO | ISIG); |
| 201 | if (tcsetattr(fd, TCSAFLUSH, &ta)) goto fail_1; |
| 202 | if (write(fd, prompt, strlen(prompt)) < 0) goto fail_2; |
| 203 | pixie_fdline(fd, buf, sz); |
| 204 | tcsetattr(fd, TCSAFLUSH, &ota); |
| 205 | if (write(fd, &nl, 1) < 0) goto fail_1; |
| 206 | close(fd); |
| 207 | } |
| 208 | return (0); |
| 209 | |
| 210 | /* --- Tidy up if things went wrong --- */ |
| 211 | |
| 212 | fail_2: |
| 213 | tcsetattr(fd, TCSAFLUSH, &ota); |
| 214 | fail_1: |
| 215 | close(fd); |
| 216 | fail_0: |
| 217 | return (-1); |
| 218 | } |
| 219 | |
| 220 | /* --- @pixie_open@ --- * |
| 221 | * |
| 222 | * Arguments: @const char *sock@ = path to pixie socket |
| 223 | * |
| 224 | * Returns: Less than zero if it failed, or file descriptor. |
| 225 | * |
| 226 | * Use: Opens a connection to a passphrase pixie. |
| 227 | */ |
| 228 | |
| 229 | int pixie_open(const char *sock) |
| 230 | { |
| 231 | struct sockaddr_un *sun; |
| 232 | size_t sz; |
| 233 | int fd; |
| 234 | |
| 235 | /* --- Open the connection --- */ |
| 236 | |
| 237 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
| 238 | goto fail_0; |
| 239 | sun = pixie_address(sock, &sz); |
| 240 | if (connect(fd, (struct sockaddr *)sun, sz)) |
| 241 | goto fail_1; |
| 242 | xfree(sun); |
| 243 | return (fd); |
| 244 | |
| 245 | /* --- Tidy up if things went wrong --- */ |
| 246 | |
| 247 | fail_1: |
| 248 | xfree(sun); |
| 249 | close(fd); |
| 250 | fail_0: |
| 251 | return (-1); |
| 252 | } |
| 253 | |
| 254 | /* --- @pixie_read@ --- * |
| 255 | * |
| 256 | * Arguments: @int fd@ = connection to passphrase pixie |
| 257 | * @const char *tag@ = pointer to tag string |
| 258 | * @unsigned mode@ = reading mode |
| 259 | * @char *buf@ = pointer to destination buffer |
| 260 | * @size_t sz@ = size of the buffer |
| 261 | * |
| 262 | * Returns: Zero if all went well, @-1@ if the read fails, @+1@ to |
| 263 | * request the passphrase from the user. |
| 264 | * |
| 265 | * Use: Reads a passphrase from the pixie. |
| 266 | */ |
| 267 | |
| 268 | int pixie_read(int fd, const char *tag, unsigned mode, char *buf, size_t sz) |
| 269 | { |
| 270 | dstr d = DSTR_INIT; |
| 271 | char *p, *q; |
| 272 | |
| 273 | /* --- Send the request --- */ |
| 274 | |
| 275 | dstr_putf(&d, "%s %s\n", mode == PMODE_READ ? "PASS" : "VERIFY", tag); |
| 276 | if (write(fd, d.buf, d.len) < 0) return (-1); |
| 277 | dstr_destroy(&d); |
| 278 | |
| 279 | /* --- Sort out the result --- */ |
| 280 | |
| 281 | again: |
| 282 | pixie_fdline(fd, buf, sz); |
| 283 | p = buf; |
| 284 | if ((q = str_getword(&p)) == 0) |
| 285 | return (-1); |
| 286 | if (strcmp(q, "INFO") == 0) |
| 287 | goto again; |
| 288 | else if (strcmp(q, "MISSING") == 0) |
| 289 | return (+1); |
| 290 | else if (strcmp(q, "OK") != 0) |
| 291 | return (-1); |
| 292 | |
| 293 | /* --- Return the final answer --- */ |
| 294 | |
| 295 | if (p) |
| 296 | memmove(buf, p, strlen(p) + 1); |
| 297 | else |
| 298 | *buf = 0; |
| 299 | return (0); |
| 300 | } |
| 301 | |
| 302 | /* --- @pixie_set@ --- * |
| 303 | * |
| 304 | * Arguments: @int fd@ = pixie file descriptor |
| 305 | * @const char *tag@ = pointer to tag string |
| 306 | * @const char *phrase@ = pointer to passphrase string |
| 307 | * |
| 308 | * Returns: --- |
| 309 | * |
| 310 | * Use: Sends a passphrase to the passphrase pixie. |
| 311 | */ |
| 312 | |
| 313 | void pixie_set(int fd, const char *tag, const char *phrase) |
| 314 | { |
| 315 | dstr d = DSTR_INIT; |
| 316 | char buf[16]; |
| 317 | size_t sz = strlen(phrase); |
| 318 | char nl = '\n'; |
| 319 | char *p, *q; |
| 320 | |
| 321 | /* --- Send the request --- * |
| 322 | * |
| 323 | * I didn't want to copy it out of the caller's buffer. @writev@ may |
| 324 | * produce a copy, too, so I didn't do that either. |
| 325 | */ |
| 326 | |
| 327 | dstr_putf(&d, "SET %s -- ", tag); |
| 328 | if (write(fd, d.buf, d.len) < 0 || |
| 329 | write(fd, phrase, sz) < 0 || |
| 330 | write(fd, &nl, 1) < 0) |
| 331 | return; |
| 332 | dstr_destroy(&d); |
| 333 | |
| 334 | /* --- Pick up the pieces --- */ |
| 335 | |
| 336 | again: |
| 337 | pixie_fdline(fd, buf, sizeof(buf)); |
| 338 | p = buf; |
| 339 | if ((q = str_getword(&p)) != 0 && strcmp(q, "INFO") == 0) |
| 340 | goto again; |
| 341 | } |
| 342 | |
| 343 | /* --- @pixie_cancel@ --- * |
| 344 | * |
| 345 | * Arguments: @int fd@ = pixie file descriptor |
| 346 | * @const char *tag@ = pointer to tag string |
| 347 | * |
| 348 | * Returns: --- |
| 349 | * |
| 350 | * Use: Cancels a passphrase if it turns out to be bogus. |
| 351 | */ |
| 352 | |
| 353 | void pixie_cancel(int fd, const char *tag) |
| 354 | { |
| 355 | dstr d = DSTR_INIT; |
| 356 | char buf[16]; |
| 357 | char *p, *q; |
| 358 | |
| 359 | /* --- Send the request --- */ |
| 360 | |
| 361 | dstr_putf(&d, "FLUSH %s\n", tag); |
| 362 | if (write(fd, d.buf, d.len) < 0) return; |
| 363 | dstr_destroy(&d); |
| 364 | |
| 365 | /* --- Sort out the result --- */ |
| 366 | |
| 367 | again: |
| 368 | pixie_fdline(fd, buf, sizeof(buf)); |
| 369 | p = buf; |
| 370 | if ((q = str_getword(&p)) != 0 && strcmp(q, "INFO") == 0) |
| 371 | goto again; |
| 372 | } |
| 373 | |
| 374 | /*----- That's all, folks -------------------------------------------------*/ |