apps/engine.c

   1 /*
   2  * Copyright 2000-2017 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 # include <openssl/store.h>
  23
  24 typedef enum OPTION_choice {
  25     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  26     OPT_C, OPT_T, OPT_TT, OPT_PRE, OPT_POST,
  27     OPT_V = 100, OPT_VV, OPT_VVV, OPT_VVVV
  28 } OPTION_CHOICE;
  29
  30 const OPTIONS engine_options[] = {
  31     {OPT_HELP_STR, 1, '-', "Usage: %s [options] engine...\n"},
  32     {OPT_HELP_STR, 1, '-',
  33         "  engine... Engines to load\n"},
  34     {"help", OPT_HELP, '-', "Display this summary"},
  35     {"v", OPT_V, '-', "List 'control commands' For each specified engine"},
  36     {"vv", OPT_VV, '-', "Also display each command's description"},
  37     {"vvv", OPT_VVV, '-', "Also add the input flags for each command"},
  38     {"vvvv", OPT_VVVV, '-', "Also show internal input flags"},
  39     {"c", OPT_C, '-', "List the capabilities of specified engine"},
  40     {"t", OPT_T, '-', "Check that specified engine is available"},
  41     {"tt", OPT_TT, '-', "Display error trace for unavailable engines"},
  42     {"pre", OPT_PRE, 's', "Run command against the ENGINE before loading it"},
  43     {"post", OPT_POST, 's', "Run command against the ENGINE after loading it"},
  44     {OPT_MORE_STR, OPT_EOF, 1,
  45      "Commands are like \"SO_PATH:/lib/libdriver.so\""},
  46     {NULL}
  47 };
  48
  49 static int append_buf(char **buf, int *size, const char *s)
  50 {
  51     const int expand = 256;
  52     int len = strlen(s) + 1;
  53     char *p = *buf;
  54
  55     if (p == NULL) {
  56         *size = ((len + expand - 1) / expand) * expand;
  57         p = *buf = app_malloc(*size, "engine buffer");
  58     } else {
  59         const int blen = strlen(p);
  60
  61         if (blen > 0)
  62             len += 2 + blen;
  63
  64         if (len > *size) {
  65             *size = ((len + expand - 1) / expand) * expand;
  66             p = OPENSSL_realloc(p, *size);
  67             if (p == NULL) {
  68                 OPENSSL_free(*buf);
  69                 *buf = NULL;
  70                 return 0;
  71             }
  72             *buf = p;
  73         }
  74
  75         if (blen > 0) {
  76             p += blen;
  77             *p++ = ',';
  78             *p++ = ' ';
  79         }
  80     }
  81
  82     strcpy(p, s);
  83     return 1;
  84 }
  85
  86 static int util_flags(BIO *out, unsigned int flags, const char *indent)
  87 {
  88     int started = 0, err = 0;
  89     /* Indent before displaying input flags */
  90     BIO_printf(out, "%s%s(input flags): ", indent, indent);
  91     if (flags == 0) {
  92         BIO_printf(out, "<no flags>\n");
  93         return 1;
  94     }
  95     /*
  96      * If the object is internal, mark it in a way that shows instead of
  97      * having it part of all the other flags, even if it really is.
  98      */
  99     if (flags & ENGINE_CMD_FLAG_INTERNAL) {
 100         BIO_printf(out, "[Internal] ");
 101     }
 102
 103     if (flags & ENGINE_CMD_FLAG_NUMERIC) {
 104         BIO_printf(out, "NUMERIC");
 105         started = 1;
 106     }
 107     /*
 108      * Now we check that no combinations of the mutually exclusive NUMERIC,
 109      * STRING, and NO_INPUT flags have been used. Future flags that can be
 110      * OR'd together with these would need to added after these to preserve
 111      * the testing logic.
 112      */
 113     if (flags & ENGINE_CMD_FLAG_STRING) {
 114         if (started) {
 115             BIO_printf(out, "|");
 116             err = 1;
 117         }
 118         BIO_printf(out, "STRING");
 119         started = 1;
 120     }
 121     if (flags & ENGINE_CMD_FLAG_NO_INPUT) {
 122         if (started) {
 123             BIO_printf(out, "|");
 124             err = 1;
 125         }
 126         BIO_printf(out, "NO_INPUT");
 127         started = 1;
 128     }
 129     /* Check for unknown flags */
 130     flags = flags & ~ENGINE_CMD_FLAG_NUMERIC &
 131         ~ENGINE_CMD_FLAG_STRING &
 132         ~ENGINE_CMD_FLAG_NO_INPUT & ~ENGINE_CMD_FLAG_INTERNAL;
 133     if (flags) {
 134         if (started)
 135             BIO_printf(out, "|");
 136         BIO_printf(out, "<0x%04X>", flags);
 137     }
 138     if (err)
 139         BIO_printf(out, "  <illegal flags!>");
 140     BIO_printf(out, "\n");
 141     return 1;
 142 }
 143
 144 static int util_verbose(ENGINE *e, int verbose, BIO *out, const char *indent)
 145 {
 146     static const int line_wrap = 78;
 147     int num;
 148     int ret = 0;
 149     char *name = NULL;
 150     char *desc = NULL;
 151     int flags;
 152     int xpos = 0;
 153     STACK_OF(OPENSSL_STRING) *cmds = NULL;
 154     if (!ENGINE_ctrl(e, ENGINE_CTRL_HAS_CTRL_FUNCTION, 0, NULL, NULL) ||
 155         ((num = ENGINE_ctrl(e, ENGINE_CTRL_GET_FIRST_CMD_TYPE,
 156                             0, NULL, NULL)) <= 0)) {
 157         return 1;
 158     }
 159
 160     cmds = sk_OPENSSL_STRING_new_null();
 161     if (cmds == NULL)
 162         goto err;
 163
 164     do {
 165         int len;
 166         /* Get the command input flags */
 167         if ((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, num,
 168                                  NULL, NULL)) < 0)
 169             goto err;
 170         if (!(flags & ENGINE_CMD_FLAG_INTERNAL) || verbose >= 4) {
 171             /* Get the command name */
 172             if ((len = ENGINE_ctrl(e, ENGINE_CTRL_GET_NAME_LEN_FROM_CMD, num,
 173                                    NULL, NULL)) <= 0)
 174                 goto err;
 175             name = app_malloc(len + 1, "name buffer");
 176             if (ENGINE_ctrl(e, ENGINE_CTRL_GET_NAME_FROM_CMD, num, name,
 177                             NULL) <= 0)
 178                 goto err;
 179             /* Get the command description */
 180             if ((len = ENGINE_ctrl(e, ENGINE_CTRL_GET_DESC_LEN_FROM_CMD, num,
 181                                    NULL, NULL)) < 0)
 182                 goto err;
 183             if (len > 0) {
 184                 desc = app_malloc(len + 1, "description buffer");
 185                 if (ENGINE_ctrl(e, ENGINE_CTRL_GET_DESC_FROM_CMD, num, desc,
 186                                 NULL) <= 0)
 187                     goto err;
 188             }
 189             /* Now decide on the output */
 190             if (xpos == 0)
 191                 /* Do an indent */
 192                 xpos = BIO_puts(out, indent);
 193             else
 194                 /* Otherwise prepend a ", " */
 195                 xpos += BIO_printf(out, ", ");
 196             if (verbose == 1) {
 197                 /*
 198                  * We're just listing names, comma-delimited
 199                  */
 200                 if ((xpos > (int)strlen(indent)) &&
 201                     (xpos + (int)strlen(name) > line_wrap)) {
 202                     BIO_printf(out, "\n");
 203                     xpos = BIO_puts(out, indent);
 204                 }
 205                 xpos += BIO_printf(out, "%s", name);
 206             } else {
 207                 /* We're listing names plus descriptions */
 208                 BIO_printf(out, "%s: %s\n", name,
 209                            (desc == NULL) ? "<no description>" : desc);
 210                 /* ... and sometimes input flags */
 211                 if ((verbose >= 3) && !util_flags(out, flags, indent))
 212                     goto err;
 213                 xpos = 0;
 214             }
 215         }
 216         OPENSSL_free(name);
 217         name = NULL;
 218         OPENSSL_free(desc);
 219         desc = NULL;
 220         /* Move to the next command */
 221         num = ENGINE_ctrl(e, ENGINE_CTRL_GET_NEXT_CMD_TYPE, num, NULL, NULL);
 222     } while (num > 0);
 223     if (xpos > 0)
 224         BIO_printf(out, "\n");
 225     ret = 1;
 226  err:
 227     sk_OPENSSL_STRING_free(cmds);
 228     OPENSSL_free(name);
 229     OPENSSL_free(desc);
 230     return ret;
 231 }
 232
 233 static void util_do_cmds(ENGINE *e, STACK_OF(OPENSSL_STRING) *cmds,
 234                          BIO *out, const char *indent)
 235 {
 236     int loop, res, num = sk_OPENSSL_STRING_num(cmds);
 237
 238     if (num < 0) {
 239         BIO_printf(out, "[Error]: internal stack error\n");
 240         return;
 241     }
 242     for (loop = 0; loop < num; loop++) {
 243         char buf[256];
 244         const char *cmd, *arg;
 245         cmd = sk_OPENSSL_STRING_value(cmds, loop);
 246         res = 1;                /* assume success */
 247         /* Check if this command has no ":arg" */
 248         if ((arg = strstr(cmd, ":")) == NULL) {
 249             if (!ENGINE_ctrl_cmd_string(e, cmd, NULL, 0))
 250                 res = 0;
 251         } else {
 252             if ((int)(arg - cmd) > 254) {
 253                 BIO_printf(out, "[Error]: command name too long\n");
 254                 return;
 255             }
 256             memcpy(buf, cmd, (int)(arg - cmd));
 257             buf[arg - cmd] = '\0';
 258             arg++;              /* Move past the ":" */
 259             /* Call the command with the argument */
 260             if (!ENGINE_ctrl_cmd_string(e, buf, arg, 0))
 261                 res = 0;
 262         }
 263         if (res) {
 264             BIO_printf(out, "[Success]: %s\n", cmd);
 265         } else {
 266             BIO_printf(out, "[Failure]: %s\n", cmd);
 267             ERR_print_errors(out);
 268         }
 269     }
 270 }
 271
 272 struct util_store_cap_data {
 273     ENGINE *engine;
 274     char **cap_buf;
 275     int *cap_size;
 276     int ok;
 277 };
 278 static void util_store_cap(const OSSL_STORE_LOADER *loader, void *arg)
 279 {
 280     struct util_store_cap_data *ctx = arg;
 281
 282     if (OSSL_STORE_LOADER_get0_engine(loader) == ctx->engine) {
 283         char buf[256];
 284         BIO_snprintf(buf, sizeof(buf), "STORE(%s)",
 285                      OSSL_STORE_LOADER_get0_scheme(loader));
 286         if (!append_buf(ctx->cap_buf, ctx->cap_size, buf))
 287             ctx->ok = 0;
 288     }
 289 }
 290
 291 int engine_main(int argc, char **argv)
 292 {
 293     int ret = 1, i;
 294     int verbose = 0, list_cap = 0, test_avail = 0, test_avail_noise = 0;
 295     ENGINE *e;
 296     STACK_OF(OPENSSL_CSTRING) *engines = sk_OPENSSL_CSTRING_new_null();
 297     STACK_OF(OPENSSL_STRING) *pre_cmds = sk_OPENSSL_STRING_new_null();
 298     STACK_OF(OPENSSL_STRING) *post_cmds = sk_OPENSSL_STRING_new_null();
 299     BIO *out;
 300     const char *indent = "     ";
 301     OPTION_CHOICE o;
 302     char *prog;
 303     char *argv1;
 304
 305     out = dup_bio_out(FORMAT_TEXT);
 306     if (engines == NULL || pre_cmds == NULL || post_cmds == NULL)
 307         goto end;
 308
 309     /* Remember the original command name, parse/skip any leading engine
 310      * names, and then setup to parse the rest of the line as flags. */
 311     prog = argv[0];
 312     while ((argv1 = argv[1]) != NULL && *argv1 != '-') {
 313         sk_OPENSSL_CSTRING_push(engines, argv1);
 314         argc--;
 315         argv++;
 316     }
 317     argv[0] = prog;
 318     opt_init(argc, argv, engine_options);
 319
 320     while ((o = opt_next()) != OPT_EOF) {
 321         switch (o) {
 322         case OPT_EOF:
 323         case OPT_ERR:
 324             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 325             goto end;
 326         case OPT_HELP:
 327             opt_help(engine_options);
 328             ret = 0;
 329             goto end;
 330         case OPT_VVVV:
 331         case OPT_VVV:
 332         case OPT_VV:
 333         case OPT_V:
 334             /* Convert to an integer from one to four. */
 335             i = (int)(o - OPT_V) + 1;
 336             if (verbose < i)
 337                 verbose = i;
 338             break;
 339         case OPT_C:
 340             list_cap = 1;
 341             break;
 342         case OPT_TT:
 343             test_avail_noise++;
 344             /* fall thru */
 345         case OPT_T:
 346             test_avail++;
 347             break;
 348         case OPT_PRE:
 349             sk_OPENSSL_STRING_push(pre_cmds, opt_arg());
 350             break;
 351         case OPT_POST:
 352             sk_OPENSSL_STRING_push(post_cmds, opt_arg());
 353             break;
 354         }
 355     }
 356
 357     /* Allow any trailing parameters as engine names. */
 358     argc = opt_num_rest();
 359     argv = opt_rest();
 360     for ( ; *argv; argv++) {
 361         if (**argv == '-') {
 362             BIO_printf(bio_err, "%s: Cannot mix flags and engine names.\n",
 363                        prog);
 364             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 365             goto end;
 366         }
 367         sk_OPENSSL_CSTRING_push(engines, *argv);
 368     }
 369
 370     if (sk_OPENSSL_CSTRING_num(engines) == 0) {
 371         for (e = ENGINE_get_first(); e != NULL; e = ENGINE_get_next(e)) {
 372             sk_OPENSSL_CSTRING_push(engines, ENGINE_get_id(e));
 373         }
 374     }
 375
 376     ret = 0;
 377     for (i = 0; i < sk_OPENSSL_CSTRING_num(engines); i++) {
 378         const char *id = sk_OPENSSL_CSTRING_value(engines, i);
 379         if ((e = ENGINE_by_id(id)) != NULL) {
 380             const char *name = ENGINE_get_name(e);
 381             /*
 382              * Do "id" first, then "name". Easier to auto-parse.
 383              */
 384             BIO_printf(out, "(%s) %s\n", id, name);
 385             util_do_cmds(e, pre_cmds, out, indent);
 386             if (strcmp(ENGINE_get_id(e), id) != 0) {
 387                 BIO_printf(out, "Loaded: (%s) %s\n",
 388                            ENGINE_get_id(e), ENGINE_get_name(e));
 389             }
 390             if (list_cap) {
 391                 int cap_size = 256;
 392                 char *cap_buf = NULL;
 393                 int k, n;
 394                 const int *nids;
 395                 ENGINE_CIPHERS_PTR fn_c;
 396                 ENGINE_DIGESTS_PTR fn_d;
 397                 ENGINE_PKEY_METHS_PTR fn_pk;
 398
 399                 if (ENGINE_get_RSA(e) != NULL
 400                     && !append_buf(&cap_buf, &cap_size, "RSA"))
 401                     goto end;
 402                 if (ENGINE_get_DSA(e) != NULL
 403                     && !append_buf(&cap_buf, &cap_size, "DSA"))
 404                     goto end;
 405                 if (ENGINE_get_DH(e) != NULL
 406                     && !append_buf(&cap_buf, &cap_size, "DH"))
 407                     goto end;
 408                 if (ENGINE_get_RAND(e) != NULL
 409                     && !append_buf(&cap_buf, &cap_size, "RAND"))
 410                     goto end;
 411
 412                 fn_c = ENGINE_get_ciphers(e);
 413                 if (fn_c == NULL)
 414                     goto skip_ciphers;
 415                 n = fn_c(e, NULL, &nids, 0);
 416                 for (k = 0; k < n; ++k)
 417                     if (!append_buf(&cap_buf, &cap_size, OBJ_nid2sn(nids[k])))
 418                         goto end;
 419
 420  skip_ciphers:
 421                 fn_d = ENGINE_get_digests(e);
 422                 if (fn_d == NULL)
 423                     goto skip_digests;
 424                 n = fn_d(e, NULL, &nids, 0);
 425                 for (k = 0; k < n; ++k)
 426                     if (!append_buf(&cap_buf, &cap_size, OBJ_nid2sn(nids[k])))
 427                         goto end;
 428
 429  skip_digests:
 430                 fn_pk = ENGINE_get_pkey_meths(e);
 431                 if (fn_pk == NULL)
 432                     goto skip_pmeths;
 433                 n = fn_pk(e, NULL, &nids, 0);
 434                 for (k = 0; k < n; ++k)
 435                     if (!append_buf(&cap_buf, &cap_size, OBJ_nid2sn(nids[k])))
 436                         goto end;
 437  skip_pmeths:
 438                 {
 439                     struct util_store_cap_data store_ctx;
 440
 441                     store_ctx.engine = e;
 442                     store_ctx.cap_buf = &cap_buf;
 443                     store_ctx.cap_size = &cap_size;
 444                     store_ctx.ok = 1;
 445
 446                     OSSL_STORE_do_all_loaders(util_store_cap, &store_ctx);
 447                     if (!store_ctx.ok)
 448                         goto end;
 449                 }
 450                 if (cap_buf != NULL && (*cap_buf != '\0'))
 451                     BIO_printf(out, " [%s]\n", cap_buf);
 452
 453                 OPENSSL_free(cap_buf);
 454             }
 455             if (test_avail) {
 456                 BIO_printf(out, "%s", indent);
 457                 if (ENGINE_init(e)) {
 458                     BIO_printf(out, "[ available ]\n");
 459                     util_do_cmds(e, post_cmds, out, indent);
 460                     ENGINE_finish(e);
 461                 } else {
 462                     BIO_printf(out, "[ unavailable ]\n");
 463                     if (test_avail_noise)
 464                         ERR_print_errors_fp(stdout);
 465                     ERR_clear_error();
 466                 }
 467             }
 468             if ((verbose > 0) && !util_verbose(e, verbose, out, indent))
 469                 goto end;
 470             ENGINE_free(e);
 471         } else {
 472             ERR_print_errors(bio_err);
 473             /* because exit codes above 127 have special meaning on Unix */
 474             if (++ret > 127)
 475                 ret = 127;
 476         }
 477     }
 478
 479  end:
 480
 481     ERR_print_errors(bio_err);
 482     sk_OPENSSL_CSTRING_free(engines);
 483     sk_OPENSSL_STRING_free(pre_cmds);
 484     sk_OPENSSL_STRING_free(post_cmds);
 485     BIO_free_all(out);
 486     return (ret);
 487 }
 488 #endif