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git://git.gnupg.org/gnupg.git
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gpg: Implemented latest rfc4880bis version 5 packet hashing.
* configure.ac (AC_CHECK_SIZEOF): Test size_t. * g10/sig-check.c (check_signature_end_simple): Support v5 signatures as per current rfc4880bis. For correctness also allow for N > 2^32. * g10/sign.c (pt_extra_hash_data_t): New. (hash_sigversion_to_magic): New arg EXTRAHASH. (write_plaintext_packet): New arg R_EXTRAHASH. (write_signature_packets): Pass EXTRAHASH. (sign_file): Ditto. (sign_symencrypt_file): Ditto. -- Take care: The code path for v5 sigs has not yet been tested. Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch
parent
f199b627ce
commit
a21ca3a1ef
@ -1367,6 +1367,7 @@ AC_CHECK_SIZEOF(unsigned short)
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AC_CHECK_SIZEOF(unsigned int)
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AC_CHECK_SIZEOF(unsigned long)
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AC_CHECK_SIZEOF(unsigned long long)
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AC_CHECK_SIZEOF(size_t)
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AC_HEADER_TIME
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AC_CHECK_SIZEOF(time_t,,[[
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#include <stdio.h>
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@ -513,6 +513,7 @@ check_signature_end_simple (PKT_public_key *pk, PKT_signature *sig,
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byte buf[10];
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int i;
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size_t n;
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gcry_md_putc (digest, sig->pubkey_algo);
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gcry_md_putc (digest, sig->digest_algo);
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if (sig->hashed)
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@ -531,22 +532,39 @@ check_signature_end_simple (PKT_public_key *pk, PKT_signature *sig,
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gcry_md_putc (digest, 0);
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n = 6;
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}
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/* add some magic per Section 5.2.4 of RFC 4880. */
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i = 0;
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buf[i++] = sig->version;
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buf[i++] = 0xff;
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if (sig->version >= 5)
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{
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buf[i++] = 0;
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buf[i++] = 0;
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buf[i++] = 0;
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buf[i++] = 0;
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}
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buf[i++] = n >> 24;
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buf[i++] = n >> 16;
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buf[i++] = n >> 8;
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buf[i++] = n;
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gcry_md_write (digest, buf, i);
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/* Hash data from the literal data packet. */
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if (sig->version >= 5
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&& (sig->sig_class == 0x00 || sig->sig_class == 0x01))
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{
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/* - One octet content format
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* - File name (one octet length followed by the name)
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* - Four octet timestamp */
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memset (buf, 0, 6);
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gcry_md_write (digest, buf, 6);
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}
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/* Add some magic per Section 5.2.4 of RFC 4880. */
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i = 0;
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buf[i++] = sig->version;
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buf[i++] = 0xff;
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if (sig->version >= 5)
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{
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#if SIZEOF_SIZE_T > 4
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buf[i++] = n >> 56;
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buf[i++] = n >> 48;
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buf[i++] = n >> 40;
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buf[i++] = n >> 32;
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#else
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buf[i++] = 0;
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buf[i++] = 0;
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buf[i++] = 0;
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buf[i++] = 0;
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#endif
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}
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buf[i++] = n >> 24;
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buf[i++] = n >> 16;
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buf[i++] = n >> 8;
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buf[i++] = n;
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gcry_md_write (digest, buf, i);
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}
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gcry_md_final( digest );
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113
g10/sign.c
113
g10/sign.c
@ -49,7 +49,19 @@
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#define LF "\n"
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#endif
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static int recipient_digest_algo=0;
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/* A type for the extra data we hash into v5 signature packets. */
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struct pt_extra_hash_data_s
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{
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unsigned char mode;
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u32 timestamp;
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unsigned char namelen;
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char name[1];
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};
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typedef struct pt_extra_hash_data_s *pt_extra_hash_data_t;
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/* Hack */
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static int recipient_digest_algo;
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/*
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@ -216,10 +228,13 @@ hash_uid (gcry_md_hd_t md, int sigversion, const PKT_user_id *uid)
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/*
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* Helper to hash some parts from the signature
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* Helper to hash some parts from the signature. EXTRAHASH gives the
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* extra data to be hashed into v5 signatures; it may by NULL for
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* detached signatures.
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*/
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static void
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hash_sigversion_to_magic (gcry_md_hd_t md, const PKT_signature *sig)
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hash_sigversion_to_magic (gcry_md_hd_t md, const PKT_signature *sig,
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pt_extra_hash_data_t extrahash)
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{
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byte buf[10];
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int i;
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@ -243,12 +258,39 @@ hash_sigversion_to_magic (gcry_md_hd_t md, const PKT_signature *sig)
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gcry_md_putc (md, 0);
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n = 6;
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}
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/* Hash data from the literal data packet. */
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if (sig->version >= 5 && (sig->sig_class == 0x00 || sig->sig_class == 0x01))
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{
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/* - One octet content format
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* - File name (one octet length followed by the name)
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* - Four octet timestamp */
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if (extrahash)
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{
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buf[0] = extrahash->mode;
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buf[1] = extrahash->namelen;
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gcry_md_write (md, buf, 2);
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if (extrahash->namelen)
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gcry_md_write (md, extrahash->name, extrahash->namelen);
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buf[0] = extrahash->timestamp >> 24;
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buf[1] = extrahash->timestamp >> 16;
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buf[2] = extrahash->timestamp >> 8;
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buf[3] = extrahash->timestamp;
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gcry_md_write (md, buf, 4);
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}
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else /* Detached signatures */
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{
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memset (buf, 0, 6);
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gcry_md_write (md, buf, 6);
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}
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}
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/* Add some magic. */
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i = 0;
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buf[i++] = sig->version;
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buf[i++] = 0xff;
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if (sig->version >= 5)
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{
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/* Note: We don't hashed any data larger than 2^32 and thus we
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* can always use 0 here. See also note below. */
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buf[i++] = 0;
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buf[i++] = 0;
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buf[i++] = 0;
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@ -633,10 +675,14 @@ write_onepass_sig_packets (SK_LIST sk_list, IOBUF out, int sigclass )
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/*
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* Helper to write the plaintext (literal data) packet
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* Helper to write the plaintext (literal data) packet. At
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* R_EXTRAHASH a malloced object with the with the extra data hashed
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* into v5 signatures is stored.
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*/
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static int
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write_plaintext_packet (IOBUF out, IOBUF inp, const char *fname, int ptmode)
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write_plaintext_packet (iobuf_t out, iobuf_t inp,
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const char *fname, int ptmode,
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pt_extra_hash_data_t *r_extrahash)
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{
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PKT_plaintext *pt = NULL;
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u32 filesize;
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@ -691,6 +737,19 @@ write_plaintext_packet (IOBUF out, IOBUF inp, const char *fname, int ptmode)
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if ((rc = build_packet (out, &pkt)))
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log_error ("build_packet(PLAINTEXT) failed: %s\n",
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gpg_strerror (rc) );
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*r_extrahash = xtrymalloc (sizeof **r_extrahash + pt->namelen);
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if (!*r_extrahash)
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rc = gpg_error_from_syserror ();
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else
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{
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(*r_extrahash)->mode = pt->mode;
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(*r_extrahash)->timestamp = pt->timestamp;
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(*r_extrahash)->namelen = pt->namelen;
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/* Note that the last byte or NAME won't be initialized
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* becuase we don't need it. */
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memcpy ((*r_extrahash)->name, pt->name, pt->namelen);
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}
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pt->buf = NULL;
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free_packet (&pkt, NULL);
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}
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@ -699,6 +758,18 @@ write_plaintext_packet (IOBUF out, IOBUF inp, const char *fname, int ptmode)
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byte copy_buffer[4096];
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int bytes_copied;
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*r_extrahash = xtrymalloc (sizeof **r_extrahash);
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if (!*r_extrahash)
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{
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rc = gpg_error_from_syserror ();
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goto leave;
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}
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/* FIXME: We need to parse INP to get the to be hashed data from
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* it. */
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(*r_extrahash)->mode = 0;
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(*r_extrahash)->timestamp = 0;
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(*r_extrahash)->namelen = 0;
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while ((bytes_copied = iobuf_read (inp, copy_buffer, 4096)) != -1)
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if ((rc = iobuf_write (out, copy_buffer, bytes_copied)))
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{
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@ -708,19 +779,21 @@ write_plaintext_packet (IOBUF out, IOBUF inp, const char *fname, int ptmode)
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}
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wipememory (copy_buffer, 4096); /* burn buffer */
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}
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/* fixme: it seems that we never freed pt/pkt */
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leave:
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return rc;
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}
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/*
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* Write the signatures from the SK_LIST to OUT. HASH must be a non-finalized
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* hash which will not be changes here.
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* Write the signatures from the SK_LIST to OUT. HASH must be a
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* non-finalized hash which will not be changes here. EXTRAHASH is
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* either NULL or the extra data tro be hashed into v5 signatures.
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*/
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static int
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write_signature_packets (ctrl_t ctrl,
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SK_LIST sk_list, IOBUF out, gcry_md_hd_t hash,
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pt_extra_hash_data_t extrahash,
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int sigclass, u32 timestamp, u32 duration,
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int status_letter, const char *cache_nonce)
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{
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@ -744,7 +817,7 @@ write_signature_packets (ctrl_t ctrl,
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if (pk->version >= 5)
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sig->version = 5; /* Required for v5 keys. */
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else
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sig->version = 4; /*Required. */
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sig->version = 4; /* Required. */
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keyid_from_pk (pk, sig->keyid);
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sig->digest_algo = hash_for (pk);
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@ -762,7 +835,7 @@ write_signature_packets (ctrl_t ctrl,
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build_sig_subpkt_from_sig (sig, pk);
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mk_notation_policy_etc (sig, NULL, pk);
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hash_sigversion_to_magic (md, sig);
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hash_sigversion_to_magic (md, sig, extrahash);
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gcry_md_final (md);
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rc = do_sign (ctrl, pk, sig, md, hash_for (pk), cache_nonce);
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@ -826,6 +899,7 @@ sign_file (ctrl_t ctrl, strlist_t filenames, int detached, strlist_t locusr,
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SK_LIST sk_rover = NULL;
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int multifile = 0;
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u32 duration=0;
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pt_extra_hash_data_t extrahash = NULL;
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pfx = new_progress_context ();
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afx = new_armor_context ();
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@ -1125,7 +1199,8 @@ sign_file (ctrl_t ctrl, strlist_t filenames, int detached, strlist_t locusr,
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{
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rc = write_plaintext_packet (out, inp, fname,
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(opt.textmode && !outfile) ?
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(opt.mimemode? 'm' : 't') : 'b');
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(opt.mimemode? 'm' : 't') : 'b',
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&extrahash);
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}
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/* Catch errors from above. */
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@ -1133,7 +1208,7 @@ sign_file (ctrl_t ctrl, strlist_t filenames, int detached, strlist_t locusr,
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goto leave;
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/* Write the signatures. */
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rc = write_signature_packets (ctrl, sk_list, out, mfx.md,
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rc = write_signature_packets (ctrl, sk_list, out, mfx.md, extrahash,
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opt.textmode && !outfile? 0x01 : 0x00,
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0, duration, detached ? 'D':'S', NULL);
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if (rc)
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@ -1156,6 +1231,7 @@ sign_file (ctrl_t ctrl, strlist_t filenames, int detached, strlist_t locusr,
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recipient_digest_algo = 0;
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release_progress_context (pfx);
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release_armor_context (afx);
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xfree (extrahash);
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return rc;
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}
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@ -1286,7 +1362,7 @@ clearsign_file (ctrl_t ctrl,
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push_armor_filter (afx, out);
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/* Write the signatures. */
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rc = write_signature_packets (ctrl, sk_list, out, textmd, 0x01, 0,
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rc = write_signature_packets (ctrl, sk_list, out, textmd, NULL, 0x01, 0,
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duration, 'C', NULL);
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if (rc)
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goto leave;
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@ -1328,6 +1404,7 @@ sign_symencrypt_file (ctrl_t ctrl, const char *fname, strlist_t locusr)
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int algo;
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u32 duration = 0;
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int canceled;
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pt_extra_hash_data_t extrahash = NULL;
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pfx = new_progress_context ();
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afx = new_armor_context ();
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@ -1452,13 +1529,14 @@ sign_symencrypt_file (ctrl_t ctrl, const char *fname, strlist_t locusr)
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/* Pipe data through all filters; i.e. write the signed stuff. */
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/* (current filters: zip - encrypt - armor) */
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rc = write_plaintext_packet (out, inp, fname,
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opt.textmode ? (opt.mimemode?'m':'t'):'b');
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opt.textmode ? (opt.mimemode?'m':'t'):'b',
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&extrahash);
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if (rc)
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goto leave;
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/* Write the signatures. */
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/* (current filters: zip - encrypt - armor) */
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rc = write_signature_packets (ctrl, sk_list, out, mfx.md,
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rc = write_signature_packets (ctrl, sk_list, out, mfx.md, extrahash,
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opt.textmode? 0x01 : 0x00,
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0, duration, 'S', NULL);
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if (rc)
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@ -1480,6 +1558,7 @@ sign_symencrypt_file (ctrl_t ctrl, const char *fname, strlist_t locusr)
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xfree (s2k);
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release_progress_context (pfx);
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release_armor_context (afx);
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xfree (extrahash);
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return rc;
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}
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@ -1599,7 +1678,7 @@ make_keysig_packet (ctrl_t ctrl,
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if (!rc)
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{
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hash_sigversion_to_magic (md, sig);
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hash_sigversion_to_magic (md, sig, NULL);
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gcry_md_final (md);
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rc = complete_sig (ctrl, sig, pksk, md, cache_nonce);
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}
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@ -1699,7 +1778,7 @@ update_keysig_packet (ctrl_t ctrl,
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if (!rc)
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{
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hash_sigversion_to_magic (md, sig);
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hash_sigversion_to_magic (md, sig, NULL);
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gcry_md_final (md);
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rc = complete_sig (ctrl, sig, pksk, md, NULL);
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}
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