static cdk_error_t
read_public_subkey (cdk_stream_t inp, size_t pktlen, cdk_pkt_pubkey_t pk)
{
if (!inp || !pk)
return CDK_Inv_Value;
return read_public_key (inp, pktlen, pk);
}
int
main(int argc, char **argv)
{
GError *error = NULL;
int retval = EXIT_SUCCESS;
EVP_PKEY *pubkey;
if (!process_arguments(&argc, &argv, &error)) {
retval = handle_error(error);
g_clear_error(&error);
} else if ((pubkey = read_public_key(option_key_file, &error)) == NULL) {
retval = handle_error(error);
g_clear_error(&error);
} else {
FILE *infile = fopen(option_data_file, "rb");
if (infile == NULL) {
fprintf(stderr, "%s: %s\n", option_data_file, strerror(errno));
retval = EXIT_IO_ERROR;
} else {
uint8_t hash[SHA256_DIGEST_LENGTH];
uint8_t signature[SIGNATURE_SIZE];
if (fread(signature, 1, sizeof(signature), infile) !=
sizeof(signature)) {
if (ferror(infile)) {
fprintf(
stderr, "%s: %s\n", option_data_file, strerror(errno));
retval = EXIT_IO_ERROR;
} else {
fprintf(stderr,
"%s: File too short for signature\n",
option_data_file);
retval = EXIT_FORMAT_ERROR;
}
} else if (!hash_stream(infile, hash, &error) ||
!verify_signature(hash, signature, pubkey, &error)) {
retval = handle_error(error);
g_clear_error(&error);
} else if (option_out_file &&
!write_out_file(infile, option_out_file, &error)) {
retval = handle_error(error);
g_clear_error(&error);
}
fclose(infile);
}
EVP_PKEY_free(pubkey);
}
return retval;
}
/**
* cdk_pkt_read:
* @inp: the input stream
* @pkt: allocated packet handle to store the packet
*
* Parse the next packet on the @inp stream and return its contents in @pkt.
**/
cdk_error_t
cdk_pkt_read (cdk_stream_t inp, cdk_packet_t pkt)
{
int ctb, is_newctb;
int pkttype;
size_t pktlen = 0, pktsize = 0, is_partial = 0;
cdk_error_t rc;
if (!inp || !pkt)
return CDK_Inv_Value;
ctb = cdk_stream_getc (inp);
if (cdk_stream_eof (inp) || ctb == EOF)
return CDK_EOF;
else if (!ctb)
return CDK_Inv_Packet;
pktsize++;
if (!(ctb & 0x80))
{
_cdk_log_info ("cdk_pkt_read: no openpgp data found. "
"(ctb=%02X; fpos=%02X)\n", ctb, cdk_stream_tell (inp));
return CDK_Inv_Packet;
}
if (ctb & 0x40) /* RFC2440 packet format. */
{
pkttype = ctb & 0x3f;
is_newctb = 1;
}
else /* the old RFC1991 packet format. */
{
pkttype = ctb & 0x3f;
pkttype >>= 2;
is_newctb = 0;
}
if (pkttype > 63)
{
_cdk_log_info ("cdk_pkt_read: unknown type %d\n", pkttype);
return CDK_Inv_Packet;
}
if (is_newctb)
read_new_length (inp, &pktlen, &pktsize, &is_partial);
else
read_old_length (inp, ctb, &pktlen, &pktsize);
pkt->pkttype = pkttype;
pkt->pktlen = pktlen;
pkt->pktsize = pktsize + pktlen;
pkt->old_ctb = is_newctb ? 0 : 1;
rc = 0;
switch (pkt->pkttype)
{
case CDK_PKT_ATTRIBUTE:
pkt->pkt.user_id = cdk_calloc (1, sizeof *pkt->pkt.user_id
+ pkt->pktlen + 16 + 1);
if (!pkt->pkt.user_id)
return CDK_Out_Of_Core;
pkt->pkt.user_id->name = (char*)pkt->pkt.user_id + sizeof(*pkt->pkt.user_id);
rc = read_attribute (inp, pktlen, pkt->pkt.user_id);
pkt->pkttype = CDK_PKT_ATTRIBUTE;
break;
case CDK_PKT_USER_ID:
pkt->pkt.user_id = cdk_calloc (1, sizeof *pkt->pkt.user_id
+ pkt->pktlen + 1);
if (!pkt->pkt.user_id)
return CDK_Out_Of_Core;
pkt->pkt.user_id->name = (char*)pkt->pkt.user_id + sizeof(*pkt->pkt.user_id);
rc = read_user_id (inp, pktlen, pkt->pkt.user_id);
break;
case CDK_PKT_PUBLIC_KEY:
pkt->pkt.public_key = cdk_calloc (1, sizeof *pkt->pkt.public_key);
if (!pkt->pkt.public_key)
return CDK_Out_Of_Core;
rc = read_public_key (inp, pktlen, pkt->pkt.public_key);
break;
case CDK_PKT_PUBLIC_SUBKEY:
pkt->pkt.public_key = cdk_calloc (1, sizeof *pkt->pkt.public_key);
if (!pkt->pkt.public_key)
return CDK_Out_Of_Core;
rc = read_public_subkey (inp, pktlen, pkt->pkt.public_key);
break;
case CDK_PKT_SECRET_KEY:
pkt->pkt.secret_key = cdk_calloc (1, sizeof *pkt->pkt.secret_key);
if (!pkt->pkt.secret_key)
return CDK_Out_Of_Core;
pkt->pkt.secret_key->pk = cdk_calloc (1,
sizeof *pkt->pkt.secret_key->pk);
if (!pkt->pkt.secret_key->pk)
return CDK_Out_Of_Core;
rc = read_secret_key (inp, pktlen, pkt->pkt.secret_key);
break;
case CDK_PKT_SECRET_SUBKEY:
pkt->pkt.secret_key = cdk_calloc (1, sizeof *pkt->pkt.secret_key);
if (!pkt->pkt.secret_key)
return CDK_Out_Of_Core;
pkt->pkt.secret_key->pk = cdk_calloc (1,
sizeof *pkt->pkt.secret_key->pk);
if (!pkt->pkt.secret_key->pk)
return CDK_Out_Of_Core;
rc = read_secret_subkey (inp, pktlen, pkt->pkt.secret_key);
break;
case CDK_PKT_LITERAL:
pkt->pkt.literal = cdk_calloc (1, sizeof *pkt->pkt.literal);
if (!pkt->pkt.literal)
return CDK_Out_Of_Core;
rc = read_literal (inp, pktlen, &pkt->pkt.literal, is_partial);
break;
case CDK_PKT_ONEPASS_SIG:
pkt->pkt.onepass_sig = cdk_calloc (1, sizeof *pkt->pkt.onepass_sig);
if (!pkt->pkt.onepass_sig)
return CDK_Out_Of_Core;
rc = read_onepass_sig (inp, pktlen, pkt->pkt.onepass_sig);
break;
case CDK_PKT_SIGNATURE:
pkt->pkt.signature = cdk_calloc (1, sizeof *pkt->pkt.signature);
if (!pkt->pkt.signature)
return CDK_Out_Of_Core;
rc = read_signature (inp, pktlen, pkt->pkt.signature);
break;
case CDK_PKT_PUBKEY_ENC:
pkt->pkt.pubkey_enc = cdk_calloc (1, sizeof *pkt->pkt.pubkey_enc);
if (!pkt->pkt.pubkey_enc)
return CDK_Out_Of_Core;
rc = read_pubkey_enc (inp, pktlen, pkt->pkt.pubkey_enc);
break;
case CDK_PKT_COMPRESSED:
pkt->pkt.compressed = cdk_calloc (1, sizeof *pkt->pkt.compressed);
if (!pkt->pkt.compressed)
return CDK_Out_Of_Core;
rc = read_compressed (inp, pktlen, pkt->pkt.compressed);
break;
case CDK_PKT_MDC:
pkt->pkt.mdc = cdk_calloc (1, sizeof *pkt->pkt.mdc);
if (!pkt->pkt.mdc)
return CDK_Out_Of_Core;
rc = read_mdc (inp, pkt->pkt.mdc);
break;
default:
/* Skip all packets we don't understand */
skip_packet (inp, pktlen);
break;
}
return rc;
}
static cdk_error_t
read_secret_key (cdk_stream_t inp, size_t pktlen, cdk_pkt_seckey_t sk)
{
size_t p1, p2, nread;
int i, nskey;
int rc;
if (!inp || !sk || !sk->pk)
return CDK_Inv_Value;
if (DEBUG_PKT)
_cdk_log_debug ("read_secret_key: %d octets\n", pktlen);
p1 = cdk_stream_tell (inp);
rc = read_public_key (inp, pktlen, sk->pk);
if (rc)
return rc;
sk->s2k_usage = cdk_stream_getc (inp);
sk->protect.sha1chk = 0;
if (sk->s2k_usage == 254 || sk->s2k_usage == 255)
{
sk->protect.sha1chk = (sk->s2k_usage == 254);
sk->protect.algo = _pgp_cipher_to_gnutls (cdk_stream_getc (inp));
sk->protect.s2k = cdk_calloc (1, sizeof *sk->protect.s2k);
if (!sk->protect.s2k)
return CDK_Out_Of_Core;
rc = read_s2k (inp, sk->protect.s2k);
if (rc)
return rc;
/* refer to --export-secret-subkeys in gpg(1) */
if (sk->protect.s2k->mode == CDK_S2K_GNU_EXT)
sk->protect.ivlen = 0;
else
{
sk->protect.ivlen =
_gnutls_cipher_get_block_size (sk->protect.algo);
if (!sk->protect.ivlen)
return CDK_Inv_Packet;
rc = stream_read (inp, sk->protect.iv, sk->protect.ivlen, &nread);
if (rc)
return rc;
if (nread != sk->protect.ivlen)
return CDK_Inv_Packet;
}
}
else
sk->protect.algo = _pgp_cipher_to_gnutls (sk->s2k_usage);
if (sk->protect.algo == GNUTLS_CIPHER_NULL)
{
sk->csum = 0;
nskey = cdk_pk_get_nskey (sk->pk->pubkey_algo);
if (!nskey)
{
gnutls_assert ();
return CDK_Inv_Algo;
}
for (i = 0; i < nskey; i++)
{
rc = read_mpi (inp, &sk->mpi[i], 1);
if (rc)
return rc;
}
sk->csum = read_16 (inp);
sk->is_protected = 0;
}
else if (sk->pk->version < 4)
{
/* The length of each multiprecision integer is stored in plaintext. */
nskey = cdk_pk_get_nskey (sk->pk->pubkey_algo);
if (!nskey)
{
gnutls_assert ();
return CDK_Inv_Algo;
}
for (i = 0; i < nskey; i++)
{
rc = read_mpi (inp, &sk->mpi[i], 1);
if (rc)
return rc;
}
sk->csum = read_16 (inp);
sk->is_protected = 1;
}
else
{
/* We need to read the rest of the packet because we do not
have any information how long the encrypted mpi's are */
p2 = cdk_stream_tell (inp);
p2 -= p1;
sk->enclen = pktlen - p2;
if (sk->enclen < 2)
return CDK_Inv_Packet; /* at least 16 bits for the checksum! */
sk->encdata = cdk_calloc (1, sk->enclen + 1);
if (!sk->encdata)
return CDK_Out_Of_Core;
if (stream_read (inp, sk->encdata, sk->enclen, &nread))
return CDK_Inv_Packet;
/* Handle the GNU S2K extensions we know (just gnu-dummy right now): */
if (sk->protect.s2k->mode == CDK_S2K_GNU_EXT)
{
unsigned char gnumode;
if ((sk->enclen < strlen ("GNU") + 1) ||
(0 != memcmp ("GNU", sk->encdata, strlen ("GNU"))))
return CDK_Inv_Packet;
gnumode = sk->encdata[strlen ("GNU")];
/* we only handle gnu-dummy (mode 1).
mode 2 should refer to external smart cards.
*/
if (gnumode != 1)
return CDK_Inv_Packet;
/* gnu-dummy should have no more data */
if (sk->enclen != strlen ("GNU") + 1)
return CDK_Inv_Packet;
}
nskey = cdk_pk_get_nskey (sk->pk->pubkey_algo);
if (!nskey)
{
gnutls_assert ();
return CDK_Inv_Algo;
}
/* We mark each MPI entry with NULL to indicate a protected key. */
for (i = 0; i < nskey; i++)
sk->mpi[i] = NULL;
sk->is_protected = 1;
}
sk->is_primary = 1;
_cdk_copy_pk_to_sk (sk->pk, sk);
return 0;
}
