diff options
Diffstat (limited to 'sys/kgssapi/krb5/kcrypto_des.c')
| -rw-r--r-- | sys/kgssapi/krb5/kcrypto_des.c | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/sys/kgssapi/krb5/kcrypto_des.c b/sys/kgssapi/krb5/kcrypto_des.c new file mode 100644 index 0000000..3958897 --- /dev/null +++ b/sys/kgssapi/krb5/kcrypto_des.c @@ -0,0 +1,262 @@ +/*- + * Copyright (c) 2008 Isilon Inc http://www.isilon.com/ + * Authors: Doug Rabson <dfr@rabson.org> + * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/lock.h> +#include <sys/kobj.h> +#include <sys/malloc.h> +#include <sys/md5.h> +#include <sys/mutex.h> +#include <sys/mbuf.h> +#include <crypto/des/des.h> +#include <opencrypto/cryptodev.h> + +#include <kgssapi/gssapi.h> +#include <kgssapi/gssapi_impl.h> + +#include "kcrypto.h" + +struct des1_state { + struct mtx ds_lock; + uint64_t ds_session; +}; + +static void +des1_init(struct krb5_key_state *ks) +{ + struct des1_state *ds; + + ds = malloc(sizeof(struct des1_state), M_GSSAPI, M_WAITOK|M_ZERO); + mtx_init(&ds->ds_lock, "gss des lock", NULL, MTX_DEF); + ks->ks_priv = ds; +} + +static void +des1_destroy(struct krb5_key_state *ks) +{ + struct des1_state *ds = ks->ks_priv; + + if (ds->ds_session) + crypto_freesession(ds->ds_session); + mtx_destroy(&ds->ds_lock); + free(ks->ks_priv, M_GSSAPI); + +} + +static void +des1_set_key(struct krb5_key_state *ks, const void *in) +{ + void *kp = ks->ks_key; + struct des1_state *ds = ks->ks_priv; + struct cryptoini cri[1]; + + if (kp != in) + bcopy(in, kp, ks->ks_class->ec_keylen); + + if (ds->ds_session) + crypto_freesession(ds->ds_session); + + bzero(cri, sizeof(cri)); + + cri[0].cri_alg = CRYPTO_DES_CBC; + cri[0].cri_klen = 64; + cri[0].cri_mlen = 0; + cri[0].cri_key = ks->ks_key; + cri[0].cri_next = NULL; + + crypto_newsession(&ds->ds_session, cri, + CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE); +} + +static void +des1_random_to_key(struct krb5_key_state *ks, const void *in) +{ + uint8_t *outkey = ks->ks_key; + const uint8_t *inkey = in; + + /* + * Expand 56 bits of random data to 64 bits as follows + * (in the example, bit number 1 is the MSB of the 56 + * bits of random data): + * + * expanded = + * 1 2 3 4 5 6 7 p + * 9 10 11 12 13 14 15 p + * 17 18 19 20 21 22 23 p + * 25 26 27 28 29 30 31 p + * 33 34 35 36 37 38 39 p + * 41 42 43 44 45 46 47 p + * 49 50 51 52 53 54 55 p + * 56 48 40 32 24 16 8 p + */ + outkey[0] = inkey[0]; + outkey[1] = inkey[1]; + outkey[2] = inkey[2]; + outkey[3] = inkey[3]; + outkey[4] = inkey[4]; + outkey[5] = inkey[5]; + outkey[6] = inkey[6]; + outkey[7] = (((inkey[0] & 1) << 1) + | ((inkey[1] & 1) << 2) + | ((inkey[2] & 1) << 3) + | ((inkey[3] & 1) << 4) + | ((inkey[4] & 1) << 5) + | ((inkey[5] & 1) << 6) + | ((inkey[6] & 1) << 7)); + des_set_odd_parity((des_cblock *) outkey); + if (des_is_weak_key((des_cblock *) outkey)) + outkey[7] ^= 0xf0; + + des1_set_key(ks, ks->ks_key); +} + +static int +des1_crypto_cb(struct cryptop *crp) +{ + int error; + struct des1_state *ds = (struct des1_state *) crp->crp_opaque; + + if (CRYPTO_SESID2CAPS(ds->ds_session) & CRYPTOCAP_F_SYNC) + return (0); + + error = crp->crp_etype; + if (error == EAGAIN) + error = crypto_dispatch(crp); + mtx_lock(&ds->ds_lock); + if (error || (crp->crp_flags & CRYPTO_F_DONE)) + wakeup(crp); + mtx_unlock(&ds->ds_lock); + + return (0); +} + +static void +des1_encrypt_1(const struct krb5_key_state *ks, int buftype, void *buf, + size_t skip, size_t len, void *ivec, int encdec) +{ + struct des1_state *ds = ks->ks_priv; + struct cryptop *crp; + struct cryptodesc *crd; + int error; + + crp = crypto_getreq(1); + crd = crp->crp_desc; + + crd->crd_skip = skip; + crd->crd_len = len; + crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT | encdec; + if (ivec) { + bcopy(ivec, crd->crd_iv, 8); + } else { + bzero(crd->crd_iv, 8); + } + crd->crd_next = NULL; + crd->crd_alg = CRYPTO_DES_CBC; + + crp->crp_sid = ds->ds_session; + crp->crp_flags = buftype | CRYPTO_F_CBIFSYNC; + crp->crp_buf = buf; + crp->crp_opaque = (void *) ds; + crp->crp_callback = des1_crypto_cb; + + error = crypto_dispatch(crp); + + if ((CRYPTO_SESID2CAPS(ds->ds_session) & CRYPTOCAP_F_SYNC) == 0) { + mtx_lock(&ds->ds_lock); + if (!error && !(crp->crp_flags & CRYPTO_F_DONE)) + error = msleep(crp, &ds->ds_lock, 0, "gssdes", 0); + mtx_unlock(&ds->ds_lock); + } + + crypto_freereq(crp); +} + +static void +des1_encrypt(const struct krb5_key_state *ks, struct mbuf *inout, + size_t skip, size_t len, void *ivec, size_t ivlen) +{ + + des1_encrypt_1(ks, CRYPTO_F_IMBUF, inout, skip, len, ivec, + CRD_F_ENCRYPT); +} + +static void +des1_decrypt(const struct krb5_key_state *ks, struct mbuf *inout, + size_t skip, size_t len, void *ivec, size_t ivlen) +{ + + des1_encrypt_1(ks, CRYPTO_F_IMBUF, inout, skip, len, ivec, 0); +} + +static int +MD5Update_int(void *ctx, void *buf, u_int len) +{ + + MD5Update(ctx, buf, len); + return (0); +} + +static void +des1_checksum(const struct krb5_key_state *ks, int usage, + struct mbuf *inout, size_t skip, size_t inlen, size_t outlen) +{ + char hash[16]; + MD5_CTX md5; + + /* + * This checksum is specifically for GSS-API. First take the + * MD5 checksum of the message, then calculate the CBC mode + * checksum of that MD5 checksum using a zero IV. + */ + MD5Init(&md5); + m_apply(inout, skip, inlen, MD5Update_int, &md5); + MD5Final(hash, &md5); + + des1_encrypt_1(ks, 0, hash, 0, 16, NULL, CRD_F_ENCRYPT); + m_copyback(inout, skip + inlen, outlen, hash + 8); +} + +struct krb5_encryption_class krb5_des_encryption_class = { + "des-cbc-md5", /* name */ + ETYPE_DES_CBC_CRC, /* etype */ + 0, /* flags */ + 8, /* blocklen */ + 8, /* msgblocklen */ + 8, /* checksumlen */ + 56, /* keybits */ + 8, /* keylen */ + des1_init, + des1_destroy, + des1_set_key, + des1_random_to_key, + des1_encrypt, + des1_decrypt, + des1_checksum +}; |
