apps/engine.c

   1 /*
   2  * Copyright 2000-2018 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 "progs.h"
  17 # include <stdio.h>
  18 # include <stdlib.h>
  19 # include <string.h>
  20 # include <openssl/err.h>
  21 # include <openssl/engine.h>
  22 # include <openssl/ssl.h>
  23 # include <openssl/store.h>
  24
  25 typedef enum OPTION_choice {
  26     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  27     OPT_C, OPT_T, OPT_TT, OPT_PRE, OPT_POST,
  28     OPT_V = 100, OPT_VV, OPT_VVV, OPT_VVVV
  29 } OPTION_CHOICE;
  30
  31 const OPTIONS engine_options[] = {
  32     {OPT_HELP_STR, 1, '-', "Usage: %s [options] engine...\n"},
  33     {OPT_HELP_STR, 1, '-',
  34         "  engine... Engines to load\n"},
  35     {"help", OPT_HELP, '-', "Display this summary"},
  36     {"v", OPT_V, '-', "List 'control commands' For each specified engine"},
  37     {"vv", OPT_VV, '-', "Also display each command's description"},
  38     {"vvv", OPT_VVV, '-', "Also add the input flags for each command"},
  39     {"vvvv", OPT_VVVV, '-', "Also show internal input flags"},
  40     {"c", OPT_C, '-', "List the capabilities of specified engine"},
  41     {"t", OPT_T, '-', "Check that specified engine is available"},
  42     {"tt", OPT_TT, '-', "Display error trace for unavailable engines"},
  43     {"pre", OPT_PRE, 's', "Run command against the ENGINE before loading it"},
  44     {"post", OPT_POST, 's', "Run command against the ENGINE after loading it"},
  45     {OPT_MORE_STR, OPT_EOF, 1,
  46      "Commands are like \"SO_PATH:/lib/libdriver.so\""},
  47     {NULL}
  48 };
  49
  50 static int append_buf(char **buf, int *size, const char *s)
  51 {
  52     const int expand = 256;
  53     int len = strlen(s) + 1;
  54     char *p = *buf;
  55
  56     if (p == NULL) {
  57         *size = ((len + expand - 1) / expand) * expand;
  58         p = *buf = app_malloc(*size, "engine buffer");
  59     } else {
  60         const int blen = strlen(p);
  61
  62         if (blen > 0)
  63             len += 2 + blen;
  64
  65         if (len > *size) {
  66             *size = ((len + expand - 1) / expand) * expand;
  67             p = OPENSSL_realloc(p, *size);
  68             if (p == NULL) {
  69                 OPENSSL_free(*buf);
  70                 *buf = NULL;
  71                 return 0;
  72             }
  73             *buf = p;
  74         }
  75
  76         if (blen > 0) {
  77             p += blen;
  78             *p++ = ',';
  79             *p++ = ' ';
  80         }
  81     }
  82
  83     strcpy(p, s);
  84     return 1;
  85 }
  86
  87 static int util_flags(BIO *out, unsigned int flags, const char *indent)
  88 {
  89     int started = 0, err = 0;
  90     /* Indent before displaying input flags */
  91     BIO_printf(out, "%s%s(input flags): ", indent, indent);
  92     if (flags == 0) {
  93         BIO_printf(out, "<no flags>\n");
  94         return 1;
  95     }
  96     /*
  97      * If the object is internal, mark it in a way that shows instead of
  98      * having it part of all the other flags, even if it really is.
  99      */
 100     if (flags & ENGINE_CMD_FLAG_INTERNAL) {
 101         BIO_printf(out, "[Internal] ");
 102     }
 103
 104     if (flags & ENGINE_CMD_FLAG_NUMERIC) {
 105         BIO_printf(out, "NUMERIC");
 106         started = 1;
 107     }
 108     /*
 109      * Now we check that no combinations of the mutually exclusive NUMERIC,
 110      * STRING, and NO_INPUT flags have been used. Future flags that can be
 111      * OR'd together with these would need to added after these to preserve
 112      * the testing logic.
 113      */
 114     if (flags & ENGINE_CMD_FLAG_STRING) {
 115         if (started) {
 116             BIO_printf(out, "|");
 117             err = 1;
 118         }
 119         BIO_printf(out, "STRING");
 120         started = 1;
 121     }
 122     if (flags & ENGINE_CMD_FLAG_NO_INPUT) {
 123         if (started) {
 124             BIO_printf(out, "|");
 125             err = 1;
 126         }
 127         BIO_printf(out, "NO_INPUT");
 128         started = 1;
 129     }
 130     /* Check for unknown flags */
 131     flags = flags & ~ENGINE_CMD_FLAG_NUMERIC &
 132         ~ENGINE_CMD_FLAG_STRING &
 133         ~ENGINE_CMD_FLAG_NO_INPUT & ~ENGINE_CMD_FLAG_INTERNAL;
 134     if (flags) {
 135         if (started)
 136             BIO_printf(out, "|");
 137         BIO_printf(out, "<0x%04X>", flags);
 138     }
 139     if (err)
 140         BIO_printf(out, "  <illegal flags!>");
 141     BIO_printf(out, "\n");
 142     return 1;
 143 }
 144
 145 static int util_verbose(ENGINE *e, int verbose, BIO *out, const char *indent)
 146 {
 147     static const int line_wrap = 78;
 148     int num;
 149     int ret = 0;
 150     char *name = NULL;
 151     char *desc = NULL;
 152     int flags;
 153     int xpos = 0;
 154     STACK_OF(OPENSSL_STRING) *cmds = NULL;
 155     if (!ENGINE_ctrl(e, ENGINE_CTRL_HAS_CTRL_FUNCTION, 0, NULL, NULL) ||
 156         ((num = ENGINE_ctrl(e, ENGINE_CTRL_GET_FIRST_CMD_TYPE,
 157                             0, NULL, NULL)) <= 0)) {
 158         return 1;
 159     }
 160
 161     cmds = sk_OPENSSL_STRING_new_null();
 162     if (cmds == NULL)
 163         goto err;
 164
 165     do {
 166         int len;
 167         /* Get the command input flags */
 168         if ((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, num,
 169                                  NULL, NULL)) < 0)
 170             goto err;
 171         if (!(flags & ENGINE_CMD_FLAG_INTERNAL) || verbose >= 4) {
 172             /* Get the command name */
 173             if ((len = ENGINE_ctrl(e, ENGINE_CTRL_GET_NAME_LEN_FROM_CMD, num,
 174                                    NULL, NULL)) <= 0)
 175                 goto err;
 176             name = app_malloc(len + 1, "name buffer");
 177             if (ENGINE_ctrl(e, ENGINE_CTRL_GET_NAME_FROM_CMD, num, name,
 178                             NULL) <= 0)
 179                 goto err;
 180             /* Get the command description */
 181             if ((len = ENGINE_ctrl(e, ENGINE_CTRL_GET_DESC_LEN_FROM_CMD, num,
 182                                    NULL, NULL)) < 0)
 183                 goto err;
 184             if (len > 0) {
 185                 desc = app_malloc(len + 1, "description buffer");
 186                 if (ENGINE_ctrl(e, ENGINE_CTRL_GET_DESC_FROM_CMD, num, desc,
 187                                 NULL) <= 0)
 188                     goto err;
 189             }
 190             /* Now decide on the output */
 191             if (xpos == 0)
 192                 /* Do an indent */
 193                 xpos = BIO_puts(out, indent);
 194             else
 195                 /* Otherwise prepend a ", " */
 196                 xpos += BIO_printf(out, ", ");
 197             if (verbose == 1) {
 198                 /*
 199                  * We're just listing names, comma-delimited
 200                  */
 201                 if ((xpos > (int)strlen(indent)) &&
 202                     (xpos + (int)strlen(name) > line_wrap)) {
 203                     BIO_printf(out, "\n");
 204                     xpos = BIO_puts(out, indent);
 205                 }
 206                 xpos += BIO_printf(out, "%s", name);
 207             } else {
 208                 /* We're listing names plus descriptions */
 209                 BIO_printf(out, "%s: %s\n", name,
 210                            (desc == NULL) ? "<no description>" : desc);
 211                 /* ... and sometimes input flags */
 212                 if ((verbose >= 3) && !util_flags(out, flags, indent))
 213                     goto err;
 214                 xpos = 0;
 215             }
 216         }
 217         OPENSSL_free(name);
 218         name = NULL;
 219         OPENSSL_free(desc);
 220         desc = NULL;
 221         /* Move to the next command */
 222         num = ENGINE_ctrl(e, ENGINE_CTRL_GET_NEXT_CMD_TYPE, num, NULL, NULL);
 223     } while (num > 0);
 224     if (xpos > 0)
 225         BIO_printf(out, "\n");
 226     ret = 1;
 227  err:
 228     sk_OPENSSL_STRING_free(cmds);
 229     OPENSSL_free(name);
 230     OPENSSL_free(desc);
 231     return ret;
 232 }
 233
 234 static void util_do_cmds(ENGINE *e, STACK_OF(OPENSSL_STRING) *cmds,
 235                          BIO *out, const char *indent)
 236 {
 237     int loop, res, num = sk_OPENSSL_STRING_num(cmds);
 238
 239     if (num < 0) {
 240         BIO_printf(out, "[Error]: internal stack error\n");
 241         return;
 242     }
 243     for (loop = 0; loop < num; loop++) {
 244         char buf[256];
 245         const char *cmd, *arg;
 246         cmd = sk_OPENSSL_STRING_value(cmds, loop);
 247         res = 1;                /* assume success */
 248         /* Check if this command has no ":arg" */
 249         if ((arg = strstr(cmd, ":")) == NULL) {
 250             if (!ENGINE_ctrl_cmd_string(e, cmd, NULL, 0))
 251                 res = 0;
 252         } else {
 253             if ((int)(arg - cmd) > 254) {
 254                 BIO_printf(out, "[Error]: command name too long\n");
 255                 return;
 256             }
 257             memcpy(buf, cmd, (int)(arg - cmd));
 258             buf[arg - cmd] = '\0';
 259             arg++;              /* Move past the ":" */
 260             /* Call the command with the argument */
 261             if (!ENGINE_ctrl_cmd_string(e, buf, arg, 0))
 262                 res = 0;
 263         }
 264         if (res) {
 265             BIO_printf(out, "[Success]: %s\n", cmd);
 266         } else {
 267             BIO_printf(out, "[Failure]: %s\n", cmd);
 268             ERR_print_errors(out);
 269         }
 270     }
 271 }
 272
 273 struct util_store_cap_data {
 274     ENGINE *engine;
 275     char **cap_buf;
 276     int *cap_size;
 277     int ok;
 278 };
 279 static void util_store_cap(const OSSL_STORE_LOADER *loader, void *arg)
 280 {
 281     struct util_store_cap_data *ctx = arg;
 282
 283     if (OSSL_STORE_LOADER_get0_engine(loader) == ctx->engine) {
 284         char buf[256];
 285         BIO_snprintf(buf, sizeof(buf), "STORE(%s)",
 286                      OSSL_STORE_LOADER_get0_scheme(loader));
 287         if (!append_buf(ctx->cap_buf, ctx->cap_size, buf))
 288             ctx->ok = 0;
 289     }
 290 }
 291
 292 int engine_main(int argc, char **argv)
 293 {
 294     int ret = 1, i;
 295     int verbose = 0, list_cap = 0, test_avail = 0, test_avail_noise = 0;
 296     ENGINE *e;
 297     STACK_OF(OPENSSL_CSTRING) *engines = sk_OPENSSL_CSTRING_new_null();
 298     STACK_OF(OPENSSL_STRING) *pre_cmds = sk_OPENSSL_STRING_new_null();
 299     STACK_OF(OPENSSL_STRING) *post_cmds = sk_OPENSSL_STRING_new_null();
 300     BIO *out;
 301     const char *indent = "     ";
 302     OPTION_CHOICE o;
 303     char *prog;
 304     char *argv1;
 305
 306     out = dup_bio_out(FORMAT_TEXT);
 307     if (engines == NULL || pre_cmds == NULL || post_cmds == NULL)
 308         goto end;
 309
 310     /* Remember the original command name, parse/skip any leading engine
 311      * names, and then setup to parse the rest of the line as flags. */
 312     prog = argv[0];
 313     while ((argv1 = argv[1]) != NULL && *argv1 != '-') {
 314         sk_OPENSSL_CSTRING_push(engines, argv1);
 315         argc--;
 316         argv++;
 317     }
 318     argv[0] = prog;
 319     opt_init(argc, argv, engine_options);
 320
 321     while ((o = opt_next()) != OPT_EOF) {
 322         switch (o) {
 323         case OPT_EOF:
 324         case OPT_ERR:
 325             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 326             goto end;
 327         case OPT_HELP:
 328             opt_help(engine_options);
 329             ret = 0;
 330             goto end;
 331         case OPT_VVVV:
 332         case OPT_VVV:
 333         case OPT_VV:
 334         case OPT_V:
 335             /* Convert to an integer from one to four. */
 336             i = (int)(o - OPT_V) + 1;
 337             if (verbose < i)
 338                 verbose = i;
 339             break;
 340         case OPT_C:
 341             list_cap = 1;
 342             break;
 343         case OPT_TT:
 344             test_avail_noise++;
 345             /* fall thru */
 346         case OPT_T:
 347             test_avail++;
 348             break;
 349         case OPT_PRE:
 350             sk_OPENSSL_STRING_push(pre_cmds, opt_arg());
 351             break;
 352         case OPT_POST:
 353             sk_OPENSSL_STRING_push(post_cmds, opt_arg());
 354             break;
 355         }
 356     }
 357
 358     /* Allow any trailing parameters as engine names. */
 359     argc = opt_num_rest();
 360     argv = opt_rest();
 361     for ( ; *argv; argv++) {
 362         if (**argv == '-') {
 363             BIO_printf(bio_err, "%s: Cannot mix flags and engine names.\n",
 364                        prog);
 365             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 366             goto end;
 367         }
 368         sk_OPENSSL_CSTRING_push(engines, *argv);
 369     }
 370
 371     if (sk_OPENSSL_CSTRING_num(engines) == 0) {
 372         for (e = ENGINE_get_first(); e != NULL; e = ENGINE_get_next(e)) {
 373             sk_OPENSSL_CSTRING_push(engines, ENGINE_get_id(e));
 374         }
 375     }
 376
 377     ret = 0;
 378     for (i = 0; i < sk_OPENSSL_CSTRING_num(engines); i++) {
 379         const char *id = sk_OPENSSL_CSTRING_value(engines, i);
 380         if ((e = ENGINE_by_id(id)) != NULL) {
 381             const char *name = ENGINE_get_name(e);
 382             /*
 383              * Do "id" first, then "name". Easier to auto-parse.
 384              */
 385             BIO_printf(out, "(%s) %s\n", id, name);
 386             util_do_cmds(e, pre_cmds, out, indent);
 387             if (strcmp(ENGINE_get_id(e), id) != 0) {
 388                 BIO_printf(out, "Loaded: (%s) %s\n",
 389                            ENGINE_get_id(e), ENGINE_get_name(e));
 390             }
 391             if (list_cap) {
 392                 int cap_size = 256;
 393                 char *cap_buf = NULL;
 394                 int k, n;
 395                 const int *nids;
 396                 ENGINE_CIPHERS_PTR fn_c;
 397                 ENGINE_DIGESTS_PTR fn_d;
 398                 ENGINE_PKEY_METHS_PTR fn_pk;
 399
 400                 if (ENGINE_get_RSA(e) != NULL
 401                     && !append_buf(&cap_buf, &cap_size, "RSA"))
 402                     goto end;
 403                 if (ENGINE_get_DSA(e) != NULL
 404                     && !append_buf(&cap_buf, &cap_size, "DSA"))
 405                     goto end;
 406                 if (ENGINE_get_DH(e) != NULL
 407                     && !append_buf(&cap_buf, &cap_size, "DH"))
 408                     goto end;
 409                 if (ENGINE_get_RAND(e) != NULL
 410                     && !append_buf(&cap_buf, &cap_size, "RAND"))
 411                     goto end;
 412
 413                 fn_c = ENGINE_get_ciphers(e);
 414                 if (fn_c == NULL)
 415                     goto skip_ciphers;
 416                 n = fn_c(e, NULL, &nids, 0);
 417                 for (k = 0; k < n; ++k)
 418                     if (!append_buf(&cap_buf, &cap_size, OBJ_nid2sn(nids[k])))
 419                         goto end;
 420
 421  skip_ciphers:
 422                 fn_d = ENGINE_get_digests(e);
 423                 if (fn_d == NULL)
 424                     goto skip_digests;
 425                 n = fn_d(e, NULL, &nids, 0);
 426                 for (k = 0; k < n; ++k)
 427                     if (!append_buf(&cap_buf, &cap_size, OBJ_nid2sn(nids[k])))
 428                         goto end;
 429
 430  skip_digests:
 431                 fn_pk = ENGINE_get_pkey_meths(e);
 432                 if (fn_pk == NULL)
 433                     goto skip_pmeths;
 434                 n = fn_pk(e, NULL, &nids, 0);
 435                 for (k = 0; k < n; ++k)
 436                     if (!append_buf(&cap_buf, &cap_size, OBJ_nid2sn(nids[k])))
 437                         goto end;
 438  skip_pmeths:
 439                 {
 440                     struct util_store_cap_data store_ctx;
 441
 442                     store_ctx.engine = e;
 443                     store_ctx.cap_buf = &cap_buf;
 444                     store_ctx.cap_size = &cap_size;
 445                     store_ctx.ok = 1;
 446
 447                     OSSL_STORE_do_all_loaders(util_store_cap, &store_ctx);
 448                     if (!store_ctx.ok)
 449                         goto end;
 450                 }
 451                 if (cap_buf != NULL && (*cap_buf != '\0'))
 452                     BIO_printf(out, " [%s]\n", cap_buf);
 453
 454                 OPENSSL_free(cap_buf);
 455             }
 456             if (test_avail) {
 457                 BIO_printf(out, "%s", indent);
 458                 if (ENGINE_init(e)) {
 459                     BIO_printf(out, "[ available ]\n");
 460                     util_do_cmds(e, post_cmds, out, indent);
 461                     ENGINE_finish(e);
 462                 } else {
 463                     BIO_printf(out, "[ unavailable ]\n");
 464                     if (test_avail_noise)
 465                         ERR_print_errors_fp(stdout);
 466                     ERR_clear_error();
 467                 }
 468             }
 469             if ((verbose > 0) && !util_verbose(e, verbose, out, indent))
 470                 goto end;
 471             ENGINE_free(e);
 472         } else {
 473             ERR_print_errors(bio_err);
 474             /* because exit codes above 127 have special meaning on Unix */
 475             if (++ret > 127)
 476                 ret = 127;
 477         }
 478     }
 479
 480  end:
 481
 482     ERR_print_errors(bio_err);
 483     sk_OPENSSL_CSTRING_free(engines);
 484     sk_OPENSSL_STRING_free(pre_cmds);
 485     sk_OPENSSL_STRING_free(post_cmds);
 486     BIO_free_all(out);
 487     return ret;
 488 }
 489 #endif