apps/engine.c

   1 /*
   2  * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <openssl/opensslconf.h>
  11 #ifdef OPENSSL_NO_ENGINE
  12 NON_EMPTY_TRANSLATION_UNIT
  13 #else
  14
  15 # include "apps.h"
  16 # include <stdio.h>
  17 # include <stdlib.h>
  18 # include <string.h>
  19 # include <openssl/err.h>
  20 # include <openssl/engine.h>
  21 # include <openssl/ssl.h>
  22
  23 typedef enum OPTION_choice {
  24     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  25     OPT_C, OPT_T, OPT_TT, OPT_PRE, OPT_POST,
  26     OPT_V = 100, OPT_VV, OPT_VVV, OPT_VVVV
  27 } OPTION_CHOICE;
  28
  29 OPTIONS engine_options[] = {
  30     {OPT_HELP_STR, 1, '-', "Usage: %s [options] engine...\n"},
  31     {OPT_HELP_STR, 1, '-',
  32         "  engine... Engines to load\n"},
  33     {"help", OPT_HELP, '-', "Display this summary"},
  34     {"v", OPT_V, '-', "List 'control commands' For each specified engine"},
  35     {"vv", OPT_VV, '-', "Also display each command's description"},
  36     {"vvv", OPT_VVV, '-', "Also add the input flags for each command"},
  37     {"vvvv", OPT_VVVV, '-', "Also show internal input flags"},
  38     {"c", OPT_C, '-', "List the capabilities of specified engine"},
  39     {"t", OPT_T, '-', "Check that specified engine is available"},
  40     {"tt", OPT_TT, '-', "Display error trace for unavailable engines"},
  41     {"pre", OPT_PRE, 's', "Run command against the ENGINE before loading it"},
  42     {"post", OPT_POST, 's', "Run command against the ENGINE after loading it"},
  43     {OPT_MORE_STR, OPT_EOF, 1,
  44      "Commands are like \"SO_PATH:/lib/libdriver.so\""},
  45     {NULL}
  46 };
  47
  48 static void identity(char *ptr)
  49 {
  50 }
  51
  52 static int append_buf(char **buf, int *size, const char *s)
  53 {
  54     if (*buf == NULL) {
  55         *size = 256;
  56         *buf = app_malloc(*size, "engine buffer");
  57         **buf = '\0';
  58     }
  59
  60     if (strlen(*buf) + strlen(s) >= (unsigned int)*size) {
  61         char *tmp;
  62         *size += 256;
  63         tmp = OPENSSL_realloc(*buf, *size);
  64         if (tmp == NULL) {
  65             OPENSSL_free(*buf);
  66             *buf = NULL;
  67             return 0;
  68         }
  69         *buf = tmp;
  70     }
  71
  72     if (**buf != '\0')
  73         OPENSSL_strlcat(*buf, ", ", *size);
  74     OPENSSL_strlcat(*buf, s, *size);
  75
  76     return 1;
  77 }
  78
  79 static int util_flags(BIO *out, unsigned int flags, const char *indent)
  80 {
  81     int started = 0, err = 0;
  82     /* Indent before displaying input flags */
  83     BIO_printf(out, "%s%s(input flags): ", indent, indent);
  84     if (flags == 0) {
  85         BIO_printf(out, "<no flags>\n");
  86         return 1;
  87     }
  88     /*
  89      * If the object is internal, mark it in a way that shows instead of
  90      * having it part of all the other flags, even if it really is.
  91      */
  92     if (flags & ENGINE_CMD_FLAG_INTERNAL) {
  93         BIO_printf(out, "[Internal] ");
  94     }
  95
  96     if (flags & ENGINE_CMD_FLAG_NUMERIC) {
  97         BIO_printf(out, "NUMERIC");
  98         started = 1;
  99     }
 100     /*
 101      * Now we check that no combinations of the mutually exclusive NUMERIC,
 102      * STRING, and NO_INPUT flags have been used. Future flags that can be
 103      * OR'd together with these would need to added after these to preserve
 104      * the testing logic.
 105      */
 106     if (flags & ENGINE_CMD_FLAG_STRING) {
 107         if (started) {
 108             BIO_printf(out, "|");
 109             err = 1;
 110         }
 111         BIO_printf(out, "STRING");
 112         started = 1;
 113     }
 114     if (flags & ENGINE_CMD_FLAG_NO_INPUT) {
 115         if (started) {
 116             BIO_printf(out, "|");
 117             err = 1;
 118         }
 119         BIO_printf(out, "NO_INPUT");
 120         started = 1;
 121     }
 122     /* Check for unknown flags */
 123     flags = flags & ~ENGINE_CMD_FLAG_NUMERIC &
 124         ~ENGINE_CMD_FLAG_STRING &
 125         ~ENGINE_CMD_FLAG_NO_INPUT & ~ENGINE_CMD_FLAG_INTERNAL;
 126     if (flags) {
 127         if (started)
 128             BIO_printf(out, "|");
 129         BIO_printf(out, "<0x%04X>", flags);
 130     }
 131     if (err)
 132         BIO_printf(out, "  <illegal flags!>");
 133     BIO_printf(out, "\n");
 134     return 1;
 135 }
 136
 137 static int util_verbose(ENGINE *e, int verbose, BIO *out, const char *indent)
 138 {
 139     static const int line_wrap = 78;
 140     int num;
 141     int ret = 0;
 142     char *name = NULL;
 143     char *desc = NULL;
 144     int flags;
 145     int xpos = 0;
 146     STACK_OF(OPENSSL_STRING) *cmds = NULL;
 147     if (!ENGINE_ctrl(e, ENGINE_CTRL_HAS_CTRL_FUNCTION, 0, NULL, NULL) ||
 148         ((num = ENGINE_ctrl(e, ENGINE_CTRL_GET_FIRST_CMD_TYPE,
 149                             0, NULL, NULL)) <= 0)) {
 150         return 1;
 151     }
 152
 153     cmds = sk_OPENSSL_STRING_new_null();
 154     if (!cmds)
 155         goto err;
 156
 157     do {
 158         int len;
 159         /* Get the command input flags */
 160         if ((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, num,
 161                                  NULL, NULL)) < 0)
 162             goto err;
 163         if (!(flags & ENGINE_CMD_FLAG_INTERNAL) || verbose >= 4) {
 164             /* Get the command name */
 165             if ((len = ENGINE_ctrl(e, ENGINE_CTRL_GET_NAME_LEN_FROM_CMD, num,
 166                                    NULL, NULL)) <= 0)
 167                 goto err;
 168             name = app_malloc(len + 1, "name buffer");
 169             if (ENGINE_ctrl(e, ENGINE_CTRL_GET_NAME_FROM_CMD, num, name,
 170                             NULL) <= 0)
 171                 goto err;
 172             /* Get the command description */
 173             if ((len = ENGINE_ctrl(e, ENGINE_CTRL_GET_DESC_LEN_FROM_CMD, num,
 174                                    NULL, NULL)) < 0)
 175                 goto err;
 176             if (len > 0) {
 177                 desc = app_malloc(len + 1, "description buffer");
 178                 if (ENGINE_ctrl(e, ENGINE_CTRL_GET_DESC_FROM_CMD, num, desc,
 179                                 NULL) <= 0)
 180                     goto err;
 181             }
 182             /* Now decide on the output */
 183             if (xpos == 0)
 184                 /* Do an indent */
 185                 xpos = BIO_puts(out, indent);
 186             else
 187                 /* Otherwise prepend a ", " */
 188                 xpos += BIO_printf(out, ", ");
 189             if (verbose == 1) {
 190                 /*
 191                  * We're just listing names, comma-delimited
 192                  */
 193                 if ((xpos > (int)strlen(indent)) &&
 194                     (xpos + (int)strlen(name) > line_wrap)) {
 195                     BIO_printf(out, "\n");
 196                     xpos = BIO_puts(out, indent);
 197                 }
 198                 xpos += BIO_printf(out, "%s", name);
 199             } else {
 200                 /* We're listing names plus descriptions */
 201                 BIO_printf(out, "%s: %s\n", name,
 202                            (desc == NULL) ? "<no description>" : desc);
 203                 /* ... and sometimes input flags */
 204                 if ((verbose >= 3) && !util_flags(out, flags, indent))
 205                     goto err;
 206                 xpos = 0;
 207             }
 208         }
 209         OPENSSL_free(name);
 210         name = NULL;
 211         OPENSSL_free(desc);
 212         desc = NULL;
 213         /* Move to the next command */
 214         num = ENGINE_ctrl(e, ENGINE_CTRL_GET_NEXT_CMD_TYPE, num, NULL, NULL);
 215     } while (num > 0);
 216     if (xpos > 0)
 217         BIO_printf(out, "\n");
 218     ret = 1;
 219  err:
 220     sk_OPENSSL_STRING_pop_free(cmds, identity);
 221     OPENSSL_free(name);
 222     OPENSSL_free(desc);
 223     return ret;
 224 }
 225
 226 static void util_do_cmds(ENGINE *e, STACK_OF(OPENSSL_STRING) *cmds,
 227                          BIO *out, const char *indent)
 228 {
 229     int loop, res, num = sk_OPENSSL_STRING_num(cmds);
 230
 231     if (num < 0) {
 232         BIO_printf(out, "[Error]: internal stack error\n");
 233         return;
 234     }
 235     for (loop = 0; loop < num; loop++) {
 236         char buf[256];
 237         const char *cmd, *arg;
 238         cmd = sk_OPENSSL_STRING_value(cmds, loop);
 239         res = 1;                /* assume success */
 240         /* Check if this command has no ":arg" */
 241         if ((arg = strstr(cmd, ":")) == NULL) {
 242             if (!ENGINE_ctrl_cmd_string(e, cmd, NULL, 0))
 243                 res = 0;
 244         } else {
 245             if ((int)(arg - cmd) > 254) {
 246                 BIO_printf(out, "[Error]: command name too long\n");
 247                 return;
 248             }
 249             memcpy(buf, cmd, (int)(arg - cmd));
 250             buf[arg - cmd] = '\0';
 251             arg++;              /* Move past the ":" */
 252             /* Call the command with the argument */
 253             if (!ENGINE_ctrl_cmd_string(e, buf, arg, 0))
 254                 res = 0;
 255         }
 256         if (res)
 257             BIO_printf(out, "[Success]: %s\n", cmd);
 258         else {
 259             BIO_printf(out, "[Failure]: %s\n", cmd);
 260             ERR_print_errors(out);
 261         }
 262     }
 263 }
 264
 265 int engine_main(int argc, char **argv)
 266 {
 267     int ret = 1, i;
 268     int verbose = 0, list_cap = 0, test_avail = 0, test_avail_noise = 0;
 269     ENGINE *e;
 270     STACK_OF(OPENSSL_STRING) *engines = sk_OPENSSL_STRING_new_null();
 271     STACK_OF(OPENSSL_STRING) *pre_cmds = sk_OPENSSL_STRING_new_null();
 272     STACK_OF(OPENSSL_STRING) *post_cmds = sk_OPENSSL_STRING_new_null();
 273     BIO *out;
 274     const char *indent = "     ";
 275     OPTION_CHOICE o;
 276     char *prog;
 277     char *argv1;
 278
 279     out = dup_bio_out(FORMAT_TEXT);
 280     if (engines == NULL || pre_cmds == NULL || post_cmds == NULL)
 281         goto end;
 282
 283     /* Remember the original command name, parse/skip any leading engine
 284      * names, and then setup to parse the rest of the line as flags. */
 285     prog = argv[0];
 286     while ((argv1 = argv[1]) != NULL && *argv1 != '-') {
 287         sk_OPENSSL_STRING_push(engines, argv1);
 288         argc--;
 289         argv++;
 290     }
 291     argv[0] = prog;
 292     opt_init(argc, argv, engine_options);
 293
 294     while ((o = opt_next()) != OPT_EOF) {
 295         switch (o) {
 296         case OPT_EOF:
 297         case OPT_ERR:
 298             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 299             goto end;
 300         case OPT_HELP:
 301             opt_help(engine_options);
 302             ret = 0;
 303             goto end;
 304         case OPT_VVVV:
 305         case OPT_VVV:
 306         case OPT_VV:
 307         case OPT_V:
 308             /* Convert to an integer from one to four. */
 309             i = (int)(o - OPT_V) + 1;
 310             if (verbose < i)
 311                 verbose = i;
 312             break;
 313         case OPT_C:
 314             list_cap = 1;
 315             break;
 316         case OPT_TT:
 317             test_avail_noise++;
 318         case OPT_T:
 319             test_avail++;
 320             break;
 321         case OPT_PRE:
 322             sk_OPENSSL_STRING_push(pre_cmds, opt_arg());
 323             break;
 324         case OPT_POST:
 325             sk_OPENSSL_STRING_push(post_cmds, opt_arg());
 326             break;
 327         }
 328     }
 329
 330     /* Allow any trailing parameters as engine names. */
 331     argc = opt_num_rest();
 332     argv = opt_rest();
 333     for ( ; *argv; argv++) {
 334         if (**argv == '-') {
 335             BIO_printf(bio_err, "%s: Cannot mix flags and engine names.\n",
 336                        prog);
 337             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 338             goto end;
 339         }
 340         sk_OPENSSL_STRING_push(engines, *argv);
 341     }
 342
 343     if (sk_OPENSSL_STRING_num(engines) == 0) {
 344         for (e = ENGINE_get_first(); e != NULL; e = ENGINE_get_next(e)) {
 345             sk_OPENSSL_STRING_push(engines, (char *)ENGINE_get_id(e));
 346         }
 347     }
 348
 349     for (i = 0; i < sk_OPENSSL_STRING_num(engines); i++) {
 350         const char *id = sk_OPENSSL_STRING_value(engines, i);
 351         if ((e = ENGINE_by_id(id)) != NULL) {
 352             const char *name = ENGINE_get_name(e);
 353             /*
 354              * Do "id" first, then "name". Easier to auto-parse.
 355              */
 356             BIO_printf(out, "(%s) %s\n", id, name);
 357             util_do_cmds(e, pre_cmds, out, indent);
 358             if (strcmp(ENGINE_get_id(e), id) != 0) {
 359                 BIO_printf(out, "Loaded: (%s) %s\n",
 360                            ENGINE_get_id(e), ENGINE_get_name(e));
 361             }
 362             if (list_cap) {
 363                 int cap_size = 256;
 364                 char *cap_buf = NULL;
 365                 int k, n;
 366                 const int *nids;
 367                 ENGINE_CIPHERS_PTR fn_c;
 368                 ENGINE_DIGESTS_PTR fn_d;
 369                 ENGINE_PKEY_METHS_PTR fn_pk;
 370
 371                 if (ENGINE_get_RSA(e) != NULL
 372                     && !append_buf(&cap_buf, &cap_size, "RSA"))
 373                     goto end;
 374                 if (ENGINE_get_DSA(e) != NULL
 375                     && !append_buf(&cap_buf, &cap_size, "DSA"))
 376                     goto end;
 377                 if (ENGINE_get_DH(e) != NULL
 378                     && !append_buf(&cap_buf, &cap_size, "DH"))
 379                     goto end;
 380                 if (ENGINE_get_RAND(e) != NULL
 381                     && !append_buf(&cap_buf, &cap_size, "RAND"))
 382                     goto end;
 383
 384                 fn_c = ENGINE_get_ciphers(e);
 385                 if (!fn_c)
 386                     goto skip_ciphers;
 387                 n = fn_c(e, NULL, &nids, 0);
 388                 for (k = 0; k < n; ++k)
 389                     if (!append_buf(&cap_buf, &cap_size, OBJ_nid2sn(nids[k])))
 390                         goto end;
 391
 392  skip_ciphers:
 393                 fn_d = ENGINE_get_digests(e);
 394                 if (!fn_d)
 395                     goto skip_digests;
 396                 n = fn_d(e, NULL, &nids, 0);
 397                 for (k = 0; k < n; ++k)
 398                     if (!append_buf(&cap_buf, &cap_size, OBJ_nid2sn(nids[k])))
 399                         goto end;
 400
 401  skip_digests:
 402                 fn_pk = ENGINE_get_pkey_meths(e);
 403                 if (!fn_pk)
 404                     goto skip_pmeths;
 405                 n = fn_pk(e, NULL, &nids, 0);
 406                 for (k = 0; k < n; ++k)
 407                     if (!append_buf(&cap_buf, &cap_size, OBJ_nid2sn(nids[k])))
 408                         goto end;
 409  skip_pmeths:
 410                 if (cap_buf && (*cap_buf != '\0'))
 411                     BIO_printf(out, " [%s]\n", cap_buf);
 412
 413                 OPENSSL_free(cap_buf);
 414             }
 415             if (test_avail) {
 416                 BIO_printf(out, "%s", indent);
 417                 if (ENGINE_init(e)) {
 418                     BIO_printf(out, "[ available ]\n");
 419                     util_do_cmds(e, post_cmds, out, indent);
 420                     ENGINE_finish(e);
 421                 } else {
 422                     BIO_printf(out, "[ unavailable ]\n");
 423                     if (test_avail_noise)
 424                         ERR_print_errors_fp(stdout);
 425                     ERR_clear_error();
 426                 }
 427             }
 428             if ((verbose > 0) && !util_verbose(e, verbose, out, indent))
 429                 goto end;
 430             ENGINE_free(e);
 431         } else
 432             ERR_print_errors(bio_err);
 433     }
 434
 435     ret = 0;
 436  end:
 437
 438     ERR_print_errors(bio_err);
 439     sk_OPENSSL_STRING_pop_free(engines, identity);
 440     sk_OPENSSL_STRING_pop_free(pre_cmds, identity);
 441     sk_OPENSSL_STRING_pop_free(post_cmds, identity);
 442     BIO_free_all(out);
 443     return (ret);
 444 }
 445 #endif