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sm: Support decryption of password based encryption (pwri)
* sm/decrypt.c (pwri_parse_pbkdf2): New. (pwri_decrypt): New. (prepare_decryption): Support pwri. (gpgsm_decrypt): Test for PWRI. Move IS_DE_VS flag to DFPARM. -- Note that this is not finished because we need to implement a password callback. For now "abc" is used as passwort. Latest libksba is also required to return the required info. Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch
parent
58b330e935
commit
02029f9eab
440
sm/decrypt.c
440
sm/decrypt.c
@ -1,7 +1,7 @@
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/* decrypt.c - Decrypt a message
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* Copyright (C) 2001, 2003, 2010 Free Software Foundation, Inc.
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* Copyright (C) 2001-2019 Werner Koch
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* Copyright (C) 2015-2020 g10 Code GmbH
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* Copyright (C) 2015-2021 g10 Code GmbH
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*
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* This file is part of GnuPG.
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*
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@ -51,6 +51,7 @@ struct decrypt_filter_parm_s
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char helpblock[16]; /* needed because there is no block buffering in
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libgcrypt (yet) */
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int helpblocklen;
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int is_de_vs; /* Helper to track CO_DE_VS state. */
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};
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@ -400,6 +401,348 @@ ecdh_decrypt (unsigned char *secret, size_t secretlen,
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}
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/* Helper for pwri_decrypt to parse the derive info.
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* Example data for (DER,DERLEN):
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* SEQUENCE {
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* OCTET STRING
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* 60 76 4B E9 5E DF 3C F8 B2 F9 B6 C2 7D 5A FB 90
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* 23 B6 47 DF
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* INTEGER 10000
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* SEQUENCE {
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* OBJECT IDENTIFIER
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* hmacWithSHA512 (1 2 840 113549 2 11)
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* NULL
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* }
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* }
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*/
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static gpg_error_t
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pwri_parse_pbkdf2 (const unsigned char *der, size_t derlen,
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unsigned char const **r_salt, unsigned int *r_saltlen,
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unsigned long *r_iterations,
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enum gcry_md_algos *r_digest)
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{
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gpg_error_t err;
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size_t objlen, hdrlen;
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int class, tag, constructed, ndef;
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char *oidstr;
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err = parse_ber_header (&der, &derlen, &class, &tag, &constructed,
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&ndef, &objlen, &hdrlen);
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if (!err && (objlen > derlen || tag != TAG_SEQUENCE
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|| !constructed || ndef))
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err = gpg_error (GPG_ERR_INV_OBJ);
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if (err)
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return err;
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derlen = objlen;
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err = parse_ber_header (&der, &derlen, &class, &tag, &constructed,
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&ndef, &objlen, &hdrlen);
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if (!err && (objlen > derlen || tag != TAG_OCTET_STRING
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|| constructed || ndef))
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err = gpg_error (GPG_ERR_INV_OBJ);
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if (err)
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return err;
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*r_salt = der;
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*r_saltlen = objlen;
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der += objlen;
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derlen -= objlen;
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err = parse_ber_header (&der, &derlen, &class, &tag, &constructed,
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&ndef, &objlen, &hdrlen);
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if (!err && (objlen > derlen || tag != TAG_INTEGER
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|| constructed || ndef))
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err = gpg_error (GPG_ERR_INV_OBJ);
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if (err)
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return err;
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*r_iterations = 0;
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for (; objlen; objlen--)
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{
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*r_iterations <<= 8;
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*r_iterations |= (*der++) & 0xff;
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derlen--;
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}
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err = parse_ber_header (&der, &derlen, &class, &tag, &constructed,
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&ndef, &objlen, &hdrlen);
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if (!err && (objlen > derlen || tag != TAG_SEQUENCE
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|| !constructed || ndef))
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err = gpg_error (GPG_ERR_INV_OBJ);
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if (err)
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return err;
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derlen = objlen;
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err = parse_ber_header (&der, &derlen, &class, &tag, &constructed,
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&ndef, &objlen, &hdrlen);
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if (!err && (objlen > derlen || tag != TAG_OBJECT_ID
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|| constructed || ndef))
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err = gpg_error (GPG_ERR_INV_OBJ);
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if (err)
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return err;
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oidstr = ksba_oid_to_str (der, objlen);
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if (!oidstr)
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return gpg_error_from_syserror ();
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*r_digest = gcry_md_map_name (oidstr);
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if (*r_digest)
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;
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else if (!strcmp (oidstr, "1.2.840.113549.2.7"))
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*r_digest = GCRY_MD_SHA1;
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else if (!strcmp (oidstr, "1.2.840.113549.2.8"))
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*r_digest = GCRY_MD_SHA224;
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else if (!strcmp (oidstr, "1.2.840.113549.2.9"))
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*r_digest = GCRY_MD_SHA256;
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else if (!strcmp (oidstr, "1.2.840.113549.2.10"))
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*r_digest = GCRY_MD_SHA384;
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else if (!strcmp (oidstr, "1.2.840.113549.2.11"))
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*r_digest = GCRY_MD_SHA512;
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else
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err = gpg_error (GPG_ERR_DIGEST_ALGO);
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ksba_free (oidstr);
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return err;
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}
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/* Password based decryption.
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* ENC_VAL has the form:
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* (enc-val
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* (pwri
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* (derive-algo <oid>) --| both are optional
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* (derive-parm <der>) --|
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* (encr-algo <oid>)
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* (encr-parm <iv>)
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* (encr-key <key>))) -- this is the encrypted session key
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*
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*/
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static gpg_error_t
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pwri_decrypt (gcry_sexp_t enc_val,
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unsigned char **r_result, unsigned int *r_resultlen,
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struct decrypt_filter_parm_s *parm)
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{
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gpg_error_t err;
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gcry_buffer_t ioarray[5] = { {0} };
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char *derive_algo_str = NULL;
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char *encr_algo_str = NULL;
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const unsigned char *dparm; /* Alias for ioarray[1]. */
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unsigned int dparmlen;
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const unsigned char *eparm; /* Alias for ioarray[3]. */
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unsigned int eparmlen;
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const unsigned char *ekey; /* Alias for ioarray[4]. */
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unsigned int ekeylen;
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unsigned char kek[32];
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unsigned int keklen;
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enum gcry_cipher_algos encr_algo;
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enum gcry_cipher_modes encr_mode;
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gcry_cipher_hd_t encr_hd = NULL;
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unsigned char *result = NULL;
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unsigned int resultlen;
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unsigned int blklen;
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const unsigned char *salt; /* Points int dparm. */
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unsigned int saltlen;
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unsigned long iterations;
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enum gcry_md_algos digest_algo;
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*r_resultlen = 0;
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*r_result = NULL;
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err = gcry_sexp_extract_param (enc_val, "enc-val!pwri",
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"&'derive-algo'?'derive-parm'?"
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"'encr-algo''encr-parm''encr-key'",
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ioarray+0, ioarray+1,
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ioarray+2, ioarray+3, ioarray+4, NULL);
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if (err)
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{
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/* If this is not pwri element, it is likly a kekri element
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* which we do not yet support. Change the error back to the
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* original as returned by ksba_cms_get_issuer. */
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if (gpg_err_code (err) == GPG_ERR_NOT_FOUND)
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err = gpg_error (GPG_ERR_UNSUPPORTED_CMS_OBJ);
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else
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log_error ("extracting PWRI parameter failed: %s\n",
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gpg_strerror (err));
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goto leave;
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}
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if (ioarray[0].data)
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{
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derive_algo_str = string_from_gcry_buffer (ioarray+0);
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if (!derive_algo_str)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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}
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dparm = ioarray[1].data;
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dparmlen = ioarray[1].len;
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encr_algo_str = string_from_gcry_buffer (ioarray+2);
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if (!encr_algo_str)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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eparm = ioarray[3].data;
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eparmlen = ioarray[3].len;
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ekey = ioarray[4].data;
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ekeylen = ioarray[4].len;
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/* Check parameters. */
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if (DBG_CRYPTO)
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{
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if (derive_algo_str)
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{
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log_debug ("derive algo: %s\n", derive_algo_str);
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log_printhex (dparm, dparmlen, "derive parm:");
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}
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log_debug ("encr algo .: %s\n", encr_algo_str);
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log_printhex (eparm, eparmlen, "encr parm .:");
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log_printhex (ekey, ekeylen, "encr key .:");
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}
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if (!derive_algo_str)
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{
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err = gpg_error (GPG_ERR_NOT_SUPPORTED);
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log_info ("PWRI with no key derivation detected\n");
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goto leave;
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}
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if (strcmp (derive_algo_str, "1.2.840.113549.1.5.12"))
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{
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err = gpg_error (GPG_ERR_NOT_SUPPORTED);
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log_info ("PWRI does not use PBKDF2 (but %s)\n", derive_algo_str);
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goto leave;
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}
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digest_algo = 0; /*(silence cc warning)*/
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err = pwri_parse_pbkdf2 (dparm, dparmlen,
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&salt, &saltlen, &iterations, &digest_algo);
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if (err)
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{
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log_error ("parsing PWRI parameter failed: %s\n", gpg_strerror (err));
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goto leave;
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}
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parm->is_de_vs = (parm->is_de_vs
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&& gnupg_digest_is_compliant (CO_DE_VS, digest_algo));
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encr_algo = gcry_cipher_map_name (encr_algo_str);
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encr_mode = gcry_cipher_mode_from_oid (encr_algo_str);
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if (!encr_algo || !encr_mode)
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{
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log_error ("PWRI uses unknown algorithm %s\n", encr_algo_str);
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err = gpg_error (GPG_ERR_CIPHER_ALGO);
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goto leave;
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}
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parm->is_de_vs =
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(parm->is_de_vs
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&& gnupg_cipher_is_compliant (CO_DE_VS, encr_algo, encr_mode));
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keklen = gcry_cipher_get_algo_keylen (encr_algo);
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blklen = gcry_cipher_get_algo_blklen (encr_algo);
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if (!keklen || keklen > sizeof kek || blklen != 16 )
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{
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log_error ("PWRI algorithm %s cannot be used\n", encr_algo_str);
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err = gpg_error (GPG_ERR_INV_KEYLEN);
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goto leave;
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}
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if ((ekeylen % blklen) || (ekeylen / blklen < 2))
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{
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/* Note that we need at least two full blocks. */
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log_error ("PWRI uses a wrong length of encrypted key\n");
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err = gpg_error (GPG_ERR_INV_KEYLEN);
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goto leave;
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}
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err = gcry_kdf_derive ("abc", 3,
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GCRY_KDF_PBKDF2, digest_algo,
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salt, saltlen, iterations,
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keklen, kek);
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if (err)
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{
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log_error ("deriving key from passphrase failed: %s\n",
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gpg_strerror (err));
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goto leave;
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}
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if (DBG_CRYPTO)
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log_printhex (kek, keklen, "KEK .......:");
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/* Unwrap the key. */
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resultlen = ekeylen;
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result = xtrymalloc_secure (resultlen);
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if (!result)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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err = gcry_cipher_open (&encr_hd, encr_algo, encr_mode, 0);
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if (err)
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{
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log_error ("PWRI failed to open cipher: %s\n", gpg_strerror (err));
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goto leave;
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}
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err = gcry_cipher_setkey (encr_hd, kek, keklen);
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wipememory (kek, sizeof kek);
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if (!err)
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err = gcry_cipher_setiv (encr_hd, ekey + ekeylen - 2 * blklen, blklen);
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if (!err)
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err = gcry_cipher_decrypt (encr_hd, result + ekeylen - blklen, blklen,
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ekey + ekeylen - blklen, blklen);
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if (!err)
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err = gcry_cipher_setiv (encr_hd, result + ekeylen - blklen, blklen);
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if (!err)
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err = gcry_cipher_decrypt (encr_hd, result, ekeylen - blklen,
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ekey, ekeylen - blklen);
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/* (We assume that that eparm is the octet string with the IV) */
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if (!err)
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err = gcry_cipher_setiv (encr_hd, eparm, eparmlen);
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if (!err)
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err = gcry_cipher_decrypt (encr_hd, result, resultlen, NULL, 0);
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if (err)
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{
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log_error ("KEK decryption failed for PWRI: %s\n", gpg_strerror (err));
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goto leave;
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}
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if (DBG_CRYPTO)
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log_printhex (result, resultlen, "Frame .....:");
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if (result[0] < 8 /* At least 64 bits */
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|| (result[0] % 8) /* Multiple of 64 bits */
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|| result[0] > resultlen - 4 /* Not more than the size of the input */
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|| ( (result[1] ^ result[4]) /* Matching check bytes. */
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& (result[2] ^ result[5])
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& (result[3] ^ result[6]) ) != 0xff)
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{
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err = gpg_error (GPG_ERR_BAD_PASSPHRASE);
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goto leave;
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}
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*r_resultlen = result[0];
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*r_result = memmove (result, result + 4, result[0]);
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result = NULL;
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leave:
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if (result)
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{
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wipememory (result, resultlen);
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xfree (result);
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}
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gcry_cipher_close (encr_hd);
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xfree (derive_algo_str);
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xfree (encr_algo_str);
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xfree (ioarray[0].data);
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xfree (ioarray[1].data);
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xfree (ioarray[2].data);
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xfree (ioarray[3].data);
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xfree (ioarray[4].data);
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return err;
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}
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/* Decrypt the session key and fill in the parm structure. The
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algo and the IV is expected to be already in PARM. */
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@ -411,23 +754,47 @@ prepare_decryption (ctrl_t ctrl, const char *hexkeygrip,
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{
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char *seskey = NULL;
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size_t n, seskeylen;
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int pwri = !hexkeygrip && !pk_algo;
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int rc;
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if (DBG_CRYPTO)
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log_printcanon ("decrypting:", enc_val, 0);
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rc = gpgsm_agent_pkdecrypt (ctrl, hexkeygrip, desc, enc_val,
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&seskey, &seskeylen);
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if (rc)
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if (!pwri)
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{
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log_error ("error decrypting session key: %s\n", gpg_strerror (rc));
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goto leave;
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rc = gpgsm_agent_pkdecrypt (ctrl, hexkeygrip, desc, enc_val,
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&seskey, &seskeylen);
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if (rc)
|
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{
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log_error ("error decrypting session key: %s\n", gpg_strerror (rc));
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goto leave;
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}
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if (DBG_CRYPTO)
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log_printhex (seskey, seskeylen, "DEK frame:");
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}
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if (DBG_CRYPTO)
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log_printhex (seskey, seskeylen, "DEK frame:");
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n=0;
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if (pk_algo == GCRY_PK_ECC)
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if (pwri) /* Password based encryption. */
|
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{
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gcry_sexp_t s_enc_val;
|
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unsigned char *decrypted;
|
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unsigned int decryptedlen;
|
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|
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rc = gcry_sexp_sscan (&s_enc_val, NULL, enc_val,
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gcry_sexp_canon_len (enc_val, 0, NULL, NULL));
|
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if (rc)
|
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goto leave;
|
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|
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rc = pwri_decrypt (s_enc_val, &decrypted, &decryptedlen, parm);
|
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gcry_sexp_release (s_enc_val);
|
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if (rc)
|
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goto leave;
|
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xfree (seskey);
|
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seskey = decrypted;
|
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seskeylen = decryptedlen;
|
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}
|
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else if (pk_algo == GCRY_PK_ECC)
|
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{
|
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gcry_sexp_t s_enc_val;
|
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unsigned char *decrypted;
|
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@ -488,7 +855,10 @@ prepare_decryption (ctrl_t ctrl, const char *hexkeygrip,
|
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}
|
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|
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if (DBG_CRYPTO)
|
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log_printhex (seskey+n, seskeylen-n, "CEK .....:");
|
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{
|
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log_printhex (seskey+n, seskeylen-n, "CEK .......:");
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log_printhex (parm->iv, parm->ivlen, "IV ........:");
|
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}
|
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|
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if (opt.verbose)
|
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log_info (_("%s.%s encrypted data\n"),
|
||||
@ -515,7 +885,12 @@ prepare_decryption (ctrl_t ctrl, const char *hexkeygrip,
|
||||
goto leave;
|
||||
}
|
||||
|
||||
gcry_cipher_setiv (parm->hd, parm->iv, parm->ivlen);
|
||||
rc = gcry_cipher_setiv (parm->hd, parm->iv, parm->ivlen);
|
||||
if (rc)
|
||||
{
|
||||
log_error("IV setup failed: %s\n", gpg_strerror(rc) );
|
||||
goto leave;
|
||||
}
|
||||
|
||||
leave:
|
||||
xfree (seskey);
|
||||
@ -704,7 +1079,6 @@ gpgsm_decrypt (ctrl_t ctrl, int in_fd, estream_t out_fp)
|
||||
int algo, mode;
|
||||
const char *algoid;
|
||||
int any_key = 0;
|
||||
int is_de_vs; /* Computed compliance with CO_DE_VS. */
|
||||
|
||||
audit_log (ctrl->audit, AUDIT_GOT_DATA);
|
||||
|
||||
@ -748,7 +1122,7 @@ gpgsm_decrypt (ctrl_t ctrl, int in_fd, estream_t out_fp)
|
||||
}
|
||||
|
||||
/* For CMS, CO_DE_VS demands CBC mode. */
|
||||
is_de_vs = gnupg_cipher_is_compliant (CO_DE_VS, algo, mode);
|
||||
dfparm.is_de_vs = gnupg_cipher_is_compliant (CO_DE_VS, algo, mode);
|
||||
|
||||
audit_log_i (ctrl->audit, AUDIT_DATA_CIPHER_ALGO, algo);
|
||||
dfparm.algo = algo;
|
||||
@ -781,6 +1155,7 @@ gpgsm_decrypt (ctrl_t ctrl, int in_fd, estream_t out_fp)
|
||||
ksba_cert_t cert = NULL;
|
||||
unsigned int nbits;
|
||||
int pk_algo = 0;
|
||||
int maybe_pwri = 0;
|
||||
|
||||
*kidbuf = 0;
|
||||
|
||||
@ -788,9 +1163,15 @@ gpgsm_decrypt (ctrl_t ctrl, int in_fd, estream_t out_fp)
|
||||
if (tmp_rc == -1 && recp)
|
||||
break; /* no more recipients */
|
||||
audit_log_i (ctrl->audit, AUDIT_NEW_RECP, recp);
|
||||
if (tmp_rc)
|
||||
log_error ("recp %d - error getting info: %s\n",
|
||||
recp, gpg_strerror (tmp_rc));
|
||||
if (gpg_err_code (tmp_rc) == GPG_ERR_UNSUPPORTED_CMS_OBJ)
|
||||
{
|
||||
maybe_pwri = 1;
|
||||
}
|
||||
else if (tmp_rc)
|
||||
{
|
||||
log_error ("recp %d - error getting info: %s\n",
|
||||
recp, gpg_strerror (tmp_rc));
|
||||
}
|
||||
else
|
||||
{
|
||||
if (opt.verbose)
|
||||
@ -885,29 +1266,37 @@ gpgsm_decrypt (ctrl_t ctrl, int in_fd, estream_t out_fp)
|
||||
}
|
||||
|
||||
/* Check that all certs are compliant with CO_DE_VS. */
|
||||
is_de_vs = (is_de_vs
|
||||
&& gnupg_pk_is_compliant (CO_DE_VS, pk_algo, 0,
|
||||
NULL, nbits, NULL));
|
||||
dfparm.is_de_vs =
|
||||
(dfparm.is_de_vs
|
||||
&& gnupg_pk_is_compliant (CO_DE_VS, pk_algo, 0,
|
||||
NULL, nbits, NULL));
|
||||
|
||||
oops:
|
||||
if (rc)
|
||||
{
|
||||
/* We cannot check compliance of certs that we
|
||||
* don't have. */
|
||||
is_de_vs = 0;
|
||||
dfparm.is_de_vs = 0;
|
||||
}
|
||||
xfree (issuer);
|
||||
xfree (serial);
|
||||
ksba_cert_release (cert);
|
||||
}
|
||||
|
||||
if (!hexkeygrip || !pk_algo)
|
||||
if ((!hexkeygrip || !pk_algo) && !maybe_pwri)
|
||||
;
|
||||
else if (!(enc_val = ksba_cms_get_enc_val (cms, recp)))
|
||||
log_error ("recp %d - error getting encrypted session key\n",
|
||||
recp);
|
||||
{
|
||||
log_error ("recp %d - error getting encrypted session key\n",
|
||||
recp);
|
||||
if (maybe_pwri)
|
||||
log_info ("(possibly unsupported KEK info)\n");
|
||||
}
|
||||
else
|
||||
{
|
||||
if (maybe_pwri && opt.verbose)
|
||||
log_info ("recp %d - KEKRI or PWRI\n", recp);
|
||||
|
||||
rc = prepare_decryption (ctrl, hexkeygrip, pk_algo, nbits,
|
||||
desc, enc_val, &dfparm);
|
||||
xfree (enc_val);
|
||||
@ -925,7 +1314,8 @@ gpgsm_decrypt (ctrl_t ctrl, int in_fd, estream_t out_fp)
|
||||
decrypt_filter,
|
||||
&dfparm);
|
||||
|
||||
if (is_de_vs && gnupg_gcrypt_is_compliant (CO_DE_VS))
|
||||
if (dfparm.is_de_vs
|
||||
&& gnupg_gcrypt_is_compliant (CO_DE_VS))
|
||||
gpgsm_status (ctrl, STATUS_DECRYPTION_COMPLIANCE_MODE,
|
||||
gnupg_status_compliance_flag (CO_DE_VS));
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user