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openssl/apps/dgst.c
Marc Brooks 871c534d39 Free fetched digest in show_digests 
Fixes #24892

Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25046)
2024-08-01 11:31:43 +02:00

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/*
* Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "apps.h"
#include "progs.h"
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/hmac.h>
#include <ctype.h>
#undef BUFSIZE
#define BUFSIZE 1024*8
int do_fp(BIO *out, unsigned char *buf, BIO *bp, int sep, int binout, int xoflen,
EVP_PKEY *key, unsigned char *sigin, int siglen,
const char *sig_name, const char *md_name,
const char *file);
static void show_digests(const OBJ_NAME *name, void *bio_);
struct doall_dgst_digests {
BIO *bio;
int n;
};
typedef enum OPTION_choice {
OPT_COMMON,
OPT_LIST,
OPT_C, OPT_R, OPT_OUT, OPT_SIGN, OPT_PASSIN, OPT_VERIFY,
OPT_PRVERIFY, OPT_SIGNATURE, OPT_KEYFORM, OPT_ENGINE, OPT_ENGINE_IMPL,
OPT_HEX, OPT_BINARY, OPT_DEBUG, OPT_FIPS_FINGERPRINT,
OPT_HMAC, OPT_MAC, OPT_SIGOPT, OPT_MACOPT, OPT_XOFLEN,
OPT_DIGEST,
OPT_R_ENUM, OPT_PROV_ENUM
} OPTION_CHOICE;
const OPTIONS dgst_options[] = {
{OPT_HELP_STR, 1, '-', "Usage: %s [options] [file...]\n"},
OPT_SECTION("General"),
{"help", OPT_HELP, '-', "Display this summary"},
{"list", OPT_LIST, '-', "List digests"},
#ifndef OPENSSL_NO_ENGINE
{"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
{"engine_impl", OPT_ENGINE_IMPL, '-',
"Also use engine given by -engine for digest operations"},
#endif
{"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
OPT_SECTION("Output"),
{"c", OPT_C, '-', "Print the digest with separating colons"},
{"r", OPT_R, '-', "Print the digest in coreutils format"},
{"out", OPT_OUT, '>', "Output to filename rather than stdout"},
{"keyform", OPT_KEYFORM, 'f', "Key file format (ENGINE, other values ignored)"},
{"hex", OPT_HEX, '-', "Print as hex dump"},
{"binary", OPT_BINARY, '-', "Print in binary form"},
{"xoflen", OPT_XOFLEN, 'p', "Output length for XOF algorithms. To obtain the maximum security strength set this to 32 (or greater) for SHAKE128, and 64 (or greater) for SHAKE256"},
{"d", OPT_DEBUG, '-', "Print debug info"},
{"debug", OPT_DEBUG, '-', "Print debug info"},
OPT_SECTION("Signing"),
{"sign", OPT_SIGN, 's', "Sign digest using private key"},
{"verify", OPT_VERIFY, 's', "Verify a signature using public key"},
{"prverify", OPT_PRVERIFY, 's', "Verify a signature using private key"},
{"sigopt", OPT_SIGOPT, 's', "Signature parameter in n:v form"},
{"signature", OPT_SIGNATURE, '<', "File with signature to verify"},
{"hmac", OPT_HMAC, 's', "Create hashed MAC with key"},
{"mac", OPT_MAC, 's', "Create MAC (not necessarily HMAC)"},
{"macopt", OPT_MACOPT, 's', "MAC algorithm parameters in n:v form or key"},
{"", OPT_DIGEST, '-', "Any supported digest"},
{"fips-fingerprint", OPT_FIPS_FINGERPRINT, '-',
"Compute HMAC with the key used in OpenSSL-FIPS fingerprint"},
OPT_R_OPTIONS,
OPT_PROV_OPTIONS,
OPT_PARAMETERS(),
{"file", 0, 0, "Files to digest (optional; default is stdin)"},
{NULL}
};
int dgst_main(int argc, char **argv)
{
BIO *in = NULL, *inp, *bmd = NULL, *out = NULL;
ENGINE *e = NULL, *impl = NULL;
EVP_PKEY *sigkey = NULL;
STACK_OF(OPENSSL_STRING) *sigopts = NULL, *macopts = NULL;
char *hmac_key = NULL;
char *mac_name = NULL, *digestname = NULL;
char *passinarg = NULL, *passin = NULL;
EVP_MD *md = NULL;
const char *outfile = NULL, *keyfile = NULL, *prog = NULL;
const char *sigfile = NULL;
const char *md_name = NULL;
OPTION_CHOICE o;
int separator = 0, debug = 0, keyform = FORMAT_UNDEF, siglen = 0;
int i, ret = EXIT_FAILURE, out_bin = -1, want_pub = 0, do_verify = 0;
int xoflen = 0;
unsigned char *buf = NULL, *sigbuf = NULL;
int engine_impl = 0;
struct doall_dgst_digests dec;
buf = app_malloc(BUFSIZE, "I/O buffer");
md = (EVP_MD *)EVP_get_digestbyname(argv[0]);
if (md != NULL)
digestname = argv[0];
opt_set_unknown_name("digest");
prog = opt_init(argc, argv, dgst_options);
while ((o = opt_next()) != OPT_EOF) {
switch (o) {
case OPT_EOF:
case OPT_ERR:
opthelp:
BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
goto end;
case OPT_HELP:
opt_help(dgst_options);
ret = EXIT_SUCCESS;
goto end;
case OPT_LIST:
BIO_printf(bio_out, "Supported digests:\n");
dec.bio = bio_out;
dec.n = 0;
OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_MD_METH,
show_digests, &dec);
BIO_printf(bio_out, "\n");
ret = EXIT_SUCCESS;
goto end;
case OPT_C:
separator = 1;
break;
case OPT_R:
separator = 2;
break;
case OPT_R_CASES:
if (!opt_rand(o))
goto end;
break;
case OPT_OUT:
outfile = opt_arg();
break;
case OPT_SIGN:
keyfile = opt_arg();
break;
case OPT_PASSIN:
passinarg = opt_arg();
break;
case OPT_VERIFY:
keyfile = opt_arg();
want_pub = do_verify = 1;
break;
case OPT_PRVERIFY:
keyfile = opt_arg();
do_verify = 1;
break;
case OPT_SIGNATURE:
sigfile = opt_arg();
break;
case OPT_KEYFORM:
if (!opt_format(opt_arg(), OPT_FMT_ANY, &keyform))
goto opthelp;
break;
case OPT_ENGINE:
e = setup_engine(opt_arg(), 0);
break;
case OPT_ENGINE_IMPL:
engine_impl = 1;
break;
case OPT_HEX:
out_bin = 0;
break;
case OPT_BINARY:
out_bin = 1;
break;
case OPT_XOFLEN:
xoflen = atoi(opt_arg());
break;
case OPT_DEBUG:
debug = 1;
break;
case OPT_FIPS_FINGERPRINT:
hmac_key = "etaonrishdlcupfm";
break;
case OPT_HMAC:
hmac_key = opt_arg();
break;
case OPT_MAC:
mac_name = opt_arg();
break;
case OPT_SIGOPT:
if (!sigopts)
sigopts = sk_OPENSSL_STRING_new_null();
if (!sigopts || !sk_OPENSSL_STRING_push(sigopts, opt_arg()))
goto opthelp;
break;
case OPT_MACOPT:
if (!macopts)
macopts = sk_OPENSSL_STRING_new_null();
if (!macopts || !sk_OPENSSL_STRING_push(macopts, opt_arg()))
goto opthelp;
break;
case OPT_DIGEST:
digestname = opt_unknown();
break;
case OPT_PROV_CASES:
if (!opt_provider(o))
goto end;
break;
}
}
/* Remaining args are files to digest. */
argc = opt_num_rest();
argv = opt_rest();
if (keyfile != NULL && argc > 1) {
BIO_printf(bio_err, "%s: Can only sign or verify one file.\n", prog);
goto end;
}
if (!app_RAND_load())
goto end;
if (digestname != NULL) {
if (!opt_md(digestname, &md))
goto opthelp;
}
if (do_verify && sigfile == NULL) {
BIO_printf(bio_err,
"No signature to verify: use the -signature option\n");
goto end;
}
if (engine_impl)
impl = e;
in = BIO_new(BIO_s_file());
bmd = BIO_new(BIO_f_md());
if (in == NULL || bmd == NULL)
goto end;
if (debug) {
BIO_set_callback_ex(in, BIO_debug_callback_ex);
/* needed for windows 3.1 */
BIO_set_callback_arg(in, (char *)bio_err);
}
if (!app_passwd(passinarg, NULL, &passin, NULL)) {
BIO_printf(bio_err, "Error getting password\n");
goto end;
}
if (out_bin == -1) {
if (keyfile != NULL)
out_bin = 1;
else
out_bin = 0;
}
out = bio_open_default(outfile, 'w', out_bin ? FORMAT_BINARY : FORMAT_TEXT);
if (out == NULL)
goto end;
if ((!(mac_name == NULL) + !(keyfile == NULL) + !(hmac_key == NULL)) > 1) {
BIO_printf(bio_err, "MAC and signing key cannot both be specified\n");
goto end;
}
if (keyfile != NULL) {
int type;
if (want_pub)
sigkey = load_pubkey(keyfile, keyform, 0, NULL, e, "public key");
else
sigkey = load_key(keyfile, keyform, 0, passin, e, "private key");
if (sigkey == NULL) {
/*
* load_[pub]key() has already printed an appropriate message
*/
goto end;
}
type = EVP_PKEY_get_id(sigkey);
if (type == EVP_PKEY_ED25519 || type == EVP_PKEY_ED448) {
/*
* We implement PureEdDSA for these which doesn't have a separate
* digest, and only supports one shot.
*/
BIO_printf(bio_err, "Key type not supported for this operation\n");
goto end;
}
}
if (mac_name != NULL) {
EVP_PKEY_CTX *mac_ctx = NULL;
if (!init_gen_str(&mac_ctx, mac_name, impl, 0, NULL, NULL))
goto end;
if (macopts != NULL) {
for (i = 0; i < sk_OPENSSL_STRING_num(macopts); i++) {
char *macopt = sk_OPENSSL_STRING_value(macopts, i);
if (pkey_ctrl_string(mac_ctx, macopt) <= 0) {
EVP_PKEY_CTX_free(mac_ctx);
BIO_printf(bio_err, "MAC parameter error \"%s\"\n", macopt);
goto end;
}
}
}
sigkey = app_keygen(mac_ctx, mac_name, 0, 0 /* not verbose */);
/* Verbose output would make external-tests gost-engine fail */
EVP_PKEY_CTX_free(mac_ctx);
if (sigkey == NULL)
goto end;
}
if (hmac_key != NULL) {
if (md == NULL) {
md = (EVP_MD *)EVP_sha256();
digestname = SN_sha256;
}
sigkey = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, impl,
(unsigned char *)hmac_key,
strlen(hmac_key));
if (sigkey == NULL)
goto end;
}
if (sigkey != NULL) {
EVP_MD_CTX *mctx = NULL;
EVP_PKEY_CTX *pctx = NULL;
int res;
if (BIO_get_md_ctx(bmd, &mctx) <= 0) {
BIO_printf(bio_err, "Error getting context\n");
goto end;
}
if (do_verify)
if (impl == NULL)
res = EVP_DigestVerifyInit_ex(mctx, &pctx, digestname,
app_get0_libctx(),
app_get0_propq(), sigkey, NULL);
else
res = EVP_DigestVerifyInit(mctx, &pctx, md, impl, sigkey);
else
if (impl == NULL)
res = EVP_DigestSignInit_ex(mctx, &pctx, digestname,
app_get0_libctx(),
app_get0_propq(), sigkey, NULL);
else
res = EVP_DigestSignInit(mctx, &pctx, md, impl, sigkey);
if (res == 0) {
BIO_printf(bio_err, "Error setting context\n");
goto end;
}
if (sigopts != NULL) {
for (i = 0; i < sk_OPENSSL_STRING_num(sigopts); i++) {
char *sigopt = sk_OPENSSL_STRING_value(sigopts, i);
if (pkey_ctrl_string(pctx, sigopt) <= 0) {
BIO_printf(bio_err, "Signature parameter error \"%s\"\n",
sigopt);
goto end;
}
}
}
}
/* we use md as a filter, reading from 'in' */
else {
EVP_MD_CTX *mctx = NULL;
if (BIO_get_md_ctx(bmd, &mctx) <= 0) {
BIO_printf(bio_err, "Error getting context\n");
goto end;
}
if (md == NULL)
md = (EVP_MD *)EVP_sha256();
if (!EVP_DigestInit_ex(mctx, md, impl)) {
BIO_printf(bio_err, "Error setting digest\n");
goto end;
}
}
if (sigfile != NULL && sigkey != NULL) {
BIO *sigbio = BIO_new_file(sigfile, "rb");
if (sigbio == NULL) {
BIO_printf(bio_err, "Error opening signature file %s\n", sigfile);
goto end;
}
siglen = EVP_PKEY_get_size(sigkey);
sigbuf = app_malloc(siglen, "signature buffer");
siglen = BIO_read(sigbio, sigbuf, siglen);
BIO_free(sigbio);
if (siglen <= 0) {
BIO_printf(bio_err, "Error reading signature file %s\n", sigfile);
goto end;
}
}
inp = BIO_push(bmd, in);
if (md == NULL) {
EVP_MD_CTX *tctx;
BIO_get_md_ctx(bmd, &tctx);
md = EVP_MD_CTX_get1_md(tctx);
}
if (md != NULL)
md_name = EVP_MD_get0_name(md);
if (xoflen > 0) {
if (!(EVP_MD_get_flags(md) & EVP_MD_FLAG_XOF)) {
BIO_printf(bio_err, "Length can only be specified for XOF\n");
goto end;
}
/*
* Signing using XOF is not supported by any algorithms currently since
* each algorithm only calls EVP_DigestFinal_ex() in their sign_final
* and verify_final methods.
*/
if (sigkey != NULL) {
BIO_printf(bio_err, "Signing key cannot be specified for XOF\n");
goto end;
}
}
if (argc == 0) {
BIO_set_fp(in, stdin, BIO_NOCLOSE);
ret = do_fp(out, buf, inp, separator, out_bin, xoflen, sigkey, sigbuf,
siglen, NULL, md_name, "stdin");
} else {
const char *sig_name = NULL;
if (out_bin == 0) {
if (sigkey != NULL)
sig_name = EVP_PKEY_get0_type_name(sigkey);
}
ret = EXIT_SUCCESS;
for (i = 0; i < argc; i++) {
if (BIO_read_filename(in, argv[i]) <= 0) {
perror(argv[i]);
ret = EXIT_FAILURE;
continue;
} else {
if (do_fp(out, buf, inp, separator, out_bin, xoflen,
sigkey, sigbuf, siglen, sig_name, md_name, argv[i]))
ret = EXIT_FAILURE;
}
(void)BIO_reset(bmd);
}
}
end:
if (ret != EXIT_SUCCESS)
ERR_print_errors(bio_err);
OPENSSL_clear_free(buf, BUFSIZE);
BIO_free(in);
OPENSSL_free(passin);
BIO_free_all(out);
EVP_MD_free(md);
EVP_PKEY_free(sigkey);
sk_OPENSSL_STRING_free(sigopts);
sk_OPENSSL_STRING_free(macopts);
OPENSSL_free(sigbuf);
BIO_free(bmd);
release_engine(e);
return ret;
}
static void show_digests(const OBJ_NAME *name, void *arg)
{
struct doall_dgst_digests *dec = (struct doall_dgst_digests *)arg;
EVP_MD *md = NULL;
/* Filter out signed digests (a.k.a signature algorithms) */
if (strstr(name->name, "rsa") != NULL || strstr(name->name, "RSA") != NULL)
return;
if (!islower((unsigned char)*name->name))
return;
/* Filter out message digests that we cannot use */
md = EVP_MD_fetch(app_get0_libctx(), name->name, app_get0_propq());
if (md == NULL) {
if (EVP_get_digestbyname(name->name) == NULL)
return;
}
BIO_printf(dec->bio, "-%-25s", name->name);
if (++dec->n == 3) {
BIO_printf(dec->bio, "\n");
dec->n = 0;
} else {
BIO_printf(dec->bio, " ");
}
EVP_MD_free(md);
}
/*
* The newline_escape_filename function performs newline escaping for any
* filename that contains a newline. This function also takes a pointer
* to backslash. The backslash pointer is a flag to indicating whether a newline
* is present in the filename. If a newline is present, the backslash flag is
* set and the output format will contain a backslash at the beginning of the
* digest output. This output format is to replicate the output format found
* in the '*sum' checksum programs. This aims to preserve backward
* compatibility.
*/
static const char *newline_escape_filename(const char *file, int *backslash)
{
size_t i, e = 0, length = strlen(file), newline_count = 0, mem_len = 0;
char *file_cpy = NULL;
for (i = 0; i < length; i++)
if (file[i] == '\n')
newline_count++;
mem_len = length + newline_count + 1;
file_cpy = app_malloc(mem_len, file);
i = 0;
while (e < length) {
const char c = file[e];
if (c == '\n') {
file_cpy[i++] = '\\';
file_cpy[i++] = 'n';
*backslash = 1;
} else {
file_cpy[i++] = c;
}
e++;
}
file_cpy[i] = '\0';
return (const char*)file_cpy;
}
int do_fp(BIO *out, unsigned char *buf, BIO *bp, int sep, int binout, int xoflen,
EVP_PKEY *key, unsigned char *sigin, int siglen,
const char *sig_name, const char *md_name,
const char *file)
{
size_t len = BUFSIZE;
int i, backslash = 0, ret = EXIT_FAILURE;
unsigned char *allocated_buf = NULL;
while (BIO_pending(bp) || !BIO_eof(bp)) {
i = BIO_read(bp, (char *)buf, BUFSIZE);
if (i < 0) {
BIO_printf(bio_err, "Read error in %s\n", file);
goto end;
}
if (i == 0)
break;
}
if (sigin != NULL) {
EVP_MD_CTX *ctx;
BIO_get_md_ctx(bp, &ctx);
i = EVP_DigestVerifyFinal(ctx, sigin, (unsigned int)siglen);
if (i > 0) {
BIO_printf(out, "Verified OK\n");
} else if (i == 0) {
BIO_printf(out, "Verification failure\n");
goto end;
} else {
BIO_printf(bio_err, "Error verifying data\n");
goto end;
}
ret = EXIT_SUCCESS;
goto end;
}
if (key != NULL) {
EVP_MD_CTX *ctx;
size_t tmplen;
BIO_get_md_ctx(bp, &ctx);
if (!EVP_DigestSignFinal(ctx, NULL, &tmplen)) {
BIO_printf(bio_err, "Error getting maximum length of signed data\n");
goto end;
}
if (tmplen > BUFSIZE) {
len = tmplen;
allocated_buf = app_malloc(len, "Signature buffer");
buf = allocated_buf;
}
if (!EVP_DigestSignFinal(ctx, buf, &len)) {
BIO_printf(bio_err, "Error signing data\n");
goto end;
}
} else if (xoflen > 0) {
EVP_MD_CTX *ctx;
len = xoflen;
if (len > BUFSIZE) {
allocated_buf = app_malloc(len, "Digest buffer");
buf = allocated_buf;
}
BIO_get_md_ctx(bp, &ctx);
if (!EVP_DigestFinalXOF(ctx, buf, len)) {
BIO_printf(bio_err, "Error Digesting Data\n");
goto end;
}
} else {
len = BIO_gets(bp, (char *)buf, BUFSIZE);
if ((int)len < 0)
goto end;
}
if (binout) {
BIO_write(out, buf, len);
} else if (sep == 2) {
file = newline_escape_filename(file, &backslash);
if (backslash == 1)
BIO_puts(out, "\\");
for (i = 0; i < (int)len; i++)
BIO_printf(out, "%02x", buf[i]);
BIO_printf(out, " *%s\n", file);
OPENSSL_free((char *)file);
} else {
if (sig_name != NULL) {
BIO_puts(out, sig_name);
if (md_name != NULL)
BIO_printf(out, "-%s", md_name);
BIO_printf(out, "(%s)= ", file);
} else if (md_name != NULL) {
BIO_printf(out, "%s(%s)= ", md_name, file);
} else {
BIO_printf(out, "(%s)= ", file);
}
for (i = 0; i < (int)len; i++) {
if (sep && (i != 0))
BIO_printf(out, ":");
BIO_printf(out, "%02x", buf[i]);
}
BIO_printf(out, "\n");
}
ret = EXIT_SUCCESS;
end:
if (allocated_buf != NULL)
OPENSSL_clear_free(allocated_buf, len);
return ret;
}
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