g_eli_integrity.c revision 221628
1159307Spjd/*- 2220922Spjd * Copyright (c) 2005-2011 Pawel Jakub Dawidek <pawel@dawidek.net> 3159307Spjd * All rights reserved. 4159307Spjd * 5159307Spjd * Redistribution and use in source and binary forms, with or without 6159307Spjd * modification, are permitted provided that the following conditions 7159307Spjd * are met: 8159307Spjd * 1. Redistributions of source code must retain the above copyright 9159307Spjd * notice, this list of conditions and the following disclaimer. 10159307Spjd * 2. Redistributions in binary form must reproduce the above copyright 11159307Spjd * notice, this list of conditions and the following disclaimer in the 12159307Spjd * documentation and/or other materials provided with the distribution. 13159307Spjd * 14159307Spjd * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15159307Spjd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16159307Spjd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17159307Spjd * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18159307Spjd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19159307Spjd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20159307Spjd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21159307Spjd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22159307Spjd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23159307Spjd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24159307Spjd * SUCH DAMAGE. 25159307Spjd */ 26159307Spjd 27159307Spjd#include <sys/cdefs.h> 28159307Spjd__FBSDID("$FreeBSD: head/sys/geom/eli/g_eli_integrity.c 221628 2011-05-08 09:17:56Z pjd $"); 29159307Spjd 30159307Spjd#include <sys/param.h> 31159307Spjd#include <sys/systm.h> 32159307Spjd#include <sys/kernel.h> 33159307Spjd#include <sys/linker.h> 34159307Spjd#include <sys/module.h> 35159307Spjd#include <sys/lock.h> 36159307Spjd#include <sys/mutex.h> 37159307Spjd#include <sys/bio.h> 38159307Spjd#include <sys/sysctl.h> 39159307Spjd#include <sys/malloc.h> 40159307Spjd#include <sys/kthread.h> 41159307Spjd#include <sys/proc.h> 42159307Spjd#include <sys/sched.h> 43159307Spjd#include <sys/smp.h> 44159307Spjd#include <sys/uio.h> 45159307Spjd#include <sys/vnode.h> 46159307Spjd 47159307Spjd#include <vm/uma.h> 48159307Spjd 49159307Spjd#include <geom/geom.h> 50159307Spjd#include <geom/eli/g_eli.h> 51159307Spjd#include <geom/eli/pkcs5v2.h> 52159307Spjd 53159307Spjd/* 54159307Spjd * The data layout description when integrity verification is configured. 55159307Spjd * 56159307Spjd * One of the most important assumption here is that authenticated data and its 57159307Spjd * HMAC has to be stored in the same place (namely in the same sector) to make 58159307Spjd * it work reliable. 59159307Spjd * The problem is that file systems work only with sectors that are multiple of 60159307Spjd * 512 bytes and a power of two number. 61159307Spjd * My idea to implement it is as follows. 62159307Spjd * Let's store HMAC in sector. This is a must. This leaves us 480 bytes for 63159307Spjd * data. We can't use that directly (ie. we can't create provider with 480 bytes 64159307Spjd * sector size). We need another sector from where we take only 32 bytes of data 65159307Spjd * and we store HMAC of this data as well. This takes two sectors from the 66159307Spjd * original provider at the input and leaves us one sector of authenticated data 67159307Spjd * at the output. Not very efficient, but you got the idea. 68159307Spjd * Now, let's assume, we want to create provider with 4096 bytes sector. 69159307Spjd * To output 4096 bytes of authenticated data we need 8x480 plus 1x256, so we 70159307Spjd * need nine 512-bytes sectors at the input to get one 4096-bytes sector at the 71159307Spjd * output. That's better. With 4096 bytes sector we can use 89% of size of the 72159307Spjd * original provider. I find it as an acceptable cost. 73159307Spjd * The reliability comes from the fact, that every HMAC stored inside the sector 74159307Spjd * is calculated only for the data in the same sector, so its impossible to 75159307Spjd * write new data and leave old HMAC or vice versa. 76159307Spjd * 77159307Spjd * And here is the picture: 78159307Spjd * 79159307Spjd * da0: +----+----+ +----+----+ +----+----+ +----+----+ +----+----+ +----+----+ +----+----+ +----+----+ +----+-----+ 80159307Spjd * |32b |480b| |32b |480b| |32b |480b| |32b |480b| |32b |480b| |32b |480b| |32b |480b| |32b |480b| |32b |256b | 81159307Spjd * |HMAC|Data| |HMAC|Data| |HMAC|Data| |HMAC|Data| |HMAC|Data| |HMAC|Data| |HMAC|Data| |HMAC|Data| |HMAC|Data | 82159307Spjd * +----+----+ +----+----+ +----+----+ +----+----+ +----+----+ +----+----+ +----+----+ +----+----+ +----+-----+ 83159307Spjd * |512 bytes| |512 bytes| |512 bytes| |512 bytes| |512 bytes| |512 bytes| |512 bytes| |512 bytes| |288 bytes | 84159307Spjd * +---------+ +---------+ +---------+ +---------+ +---------+ +---------+ +---------+ +---------+ |224 unused| 85159307Spjd * +----------+ 86159307Spjd * da0.eli: +----+----+----+----+----+----+----+----+----+ 87159307Spjd * |480b|480b|480b|480b|480b|480b|480b|480b|256b| 88159307Spjd * +----+----+----+----+----+----+----+----+----+ 89159307Spjd * | 4096 bytes | 90159307Spjd * +--------------------------------------------+ 91159307Spjd * 92159307Spjd * PS. You can use any sector size with geli(8). My example is using 4kB, 93159307Spjd * because it's most efficient. For 8kB sectors you need 2 extra sectors, 94159307Spjd * so the cost is the same as for 4kB sectors. 95159307Spjd */ 96159307Spjd 97159307Spjd/* 98159307Spjd * Code paths: 99159307Spjd * BIO_READ: 100159307Spjd * g_eli_start -> g_eli_auth_read -> g_io_request -> g_eli_read_done -> g_eli_auth_run -> g_eli_auth_read_done -> g_io_deliver 101159307Spjd * BIO_WRITE: 102159307Spjd * g_eli_start -> g_eli_auth_run -> g_eli_auth_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 103159307Spjd */ 104159307Spjd 105159307SpjdMALLOC_DECLARE(M_ELI); 106159307Spjd 107159307Spjd/* 108159307Spjd * Here we generate key for HMAC. Every sector has its own HMAC key, so it is 109159307Spjd * not possible to copy sectors. 110159307Spjd * We cannot depend on fact, that every sector has its own IV, because different 111159307Spjd * IV doesn't change HMAC, when we use encrypt-then-authenticate method. 112159307Spjd */ 113159307Spjdstatic void 114159307Spjdg_eli_auth_keygen(struct g_eli_softc *sc, off_t offset, u_char *key) 115159307Spjd{ 116159307Spjd SHA256_CTX ctx; 117159307Spjd 118159307Spjd /* Copy precalculated SHA256 context. */ 119159307Spjd bcopy(&sc->sc_akeyctx, &ctx, sizeof(ctx)); 120159307Spjd SHA256_Update(&ctx, (uint8_t *)&offset, sizeof(offset)); 121159307Spjd SHA256_Final(key, &ctx); 122159307Spjd} 123159307Spjd 124159307Spjd/* 125159307Spjd * The function is called after we read and decrypt data. 126159307Spjd * 127159307Spjd * g_eli_start -> g_eli_auth_read -> g_io_request -> g_eli_read_done -> g_eli_auth_run -> G_ELI_AUTH_READ_DONE -> g_io_deliver 128159307Spjd */ 129159307Spjdstatic int 130159307Spjdg_eli_auth_read_done(struct cryptop *crp) 131159307Spjd{ 132214118Spjd struct g_eli_softc *sc; 133159307Spjd struct bio *bp; 134159307Spjd 135159307Spjd if (crp->crp_etype == EAGAIN) { 136159307Spjd if (g_eli_crypto_rerun(crp) == 0) 137159307Spjd return (0); 138159307Spjd } 139159307Spjd bp = (struct bio *)crp->crp_opaque; 140159307Spjd bp->bio_inbed++; 141159307Spjd if (crp->crp_etype == 0) { 142159307Spjd bp->bio_completed += crp->crp_olen; 143159307Spjd G_ELI_DEBUG(3, "Crypto READ request done (%d/%d) (add=%jd completed=%jd).", 144159307Spjd bp->bio_inbed, bp->bio_children, (intmax_t)crp->crp_olen, (intmax_t)bp->bio_completed); 145159307Spjd } else { 146159307Spjd G_ELI_DEBUG(1, "Crypto READ request failed (%d/%d) error=%d.", 147159307Spjd bp->bio_inbed, bp->bio_children, crp->crp_etype); 148159307Spjd if (bp->bio_error == 0) 149159307Spjd bp->bio_error = crp->crp_etype; 150159307Spjd } 151220922Spjd sc = bp->bio_to->geom->softc; 152221625Spjd g_eli_key_drop(sc, crp->crp_desc->crd_next->crd_key); 153159307Spjd /* 154159307Spjd * Do we have all sectors already? 155159307Spjd */ 156159307Spjd if (bp->bio_inbed < bp->bio_children) 157159307Spjd return (0); 158159307Spjd if (bp->bio_error == 0) { 159159307Spjd u_int i, lsec, nsec, data_secsize, decr_secsize, encr_secsize; 160159307Spjd u_char *srcdata, *dstdata, *auth; 161159307Spjd off_t coroff, corsize; 162159307Spjd 163159307Spjd /* 164159307Spjd * Verify data integrity based on calculated and read HMACs. 165159307Spjd */ 166159307Spjd /* Sectorsize of decrypted provider eg. 4096. */ 167159307Spjd decr_secsize = bp->bio_to->sectorsize; 168159307Spjd /* The real sectorsize of encrypted provider, eg. 512. */ 169159307Spjd encr_secsize = LIST_FIRST(&sc->sc_geom->consumer)->provider->sectorsize; 170159307Spjd /* Number of data bytes in one encrypted sector, eg. 480. */ 171159307Spjd data_secsize = sc->sc_data_per_sector; 172159307Spjd /* Number of sectors from decrypted provider, eg. 2. */ 173159307Spjd nsec = bp->bio_length / decr_secsize; 174159307Spjd /* Number of sectors from encrypted provider, eg. 18. */ 175159307Spjd nsec = (nsec * sc->sc_bytes_per_sector) / encr_secsize; 176159307Spjd /* Last sector number in every big sector, eg. 9. */ 177159307Spjd lsec = sc->sc_bytes_per_sector / encr_secsize; 178159307Spjd 179159307Spjd srcdata = bp->bio_driver2; 180159307Spjd dstdata = bp->bio_data; 181159307Spjd auth = srcdata + encr_secsize * nsec; 182159307Spjd coroff = -1; 183159307Spjd corsize = 0; 184159307Spjd 185159307Spjd for (i = 1; i <= nsec; i++) { 186159307Spjd data_secsize = sc->sc_data_per_sector; 187159307Spjd if ((i % lsec) == 0) 188159307Spjd data_secsize = decr_secsize % data_secsize; 189159307Spjd if (bcmp(srcdata, auth, sc->sc_alen) != 0) { 190159307Spjd /* 191159307Spjd * Curruption detected, remember the offset if 192159307Spjd * this is the first corrupted sector and 193159307Spjd * increase size. 194159307Spjd */ 195159307Spjd if (bp->bio_error == 0) 196159307Spjd bp->bio_error = -1; 197159307Spjd if (coroff == -1) { 198159307Spjd coroff = bp->bio_offset + 199159307Spjd (dstdata - (u_char *)bp->bio_data); 200159307Spjd } 201159307Spjd corsize += data_secsize; 202159307Spjd } else { 203159307Spjd /* 204159307Spjd * No curruption, good. 205159307Spjd * Report previous corruption if there was one. 206159307Spjd */ 207159307Spjd if (coroff != -1) { 208159307Spjd G_ELI_DEBUG(0, "%s: %jd bytes " 209159307Spjd "corrupted at offset %jd.", 210159307Spjd sc->sc_name, (intmax_t)corsize, 211159307Spjd (intmax_t)coroff); 212159307Spjd coroff = -1; 213159307Spjd corsize = 0; 214159307Spjd } 215159307Spjd bcopy(srcdata + sc->sc_alen, dstdata, 216159307Spjd data_secsize); 217159307Spjd } 218159307Spjd srcdata += encr_secsize; 219159307Spjd dstdata += data_secsize; 220159307Spjd auth += sc->sc_alen; 221159307Spjd } 222159307Spjd /* Report previous corruption if there was one. */ 223159307Spjd if (coroff != -1) { 224159307Spjd G_ELI_DEBUG(0, "%s: %jd bytes corrupted at offset %jd.", 225159307Spjd sc->sc_name, (intmax_t)corsize, (intmax_t)coroff); 226159307Spjd } 227159307Spjd } 228159307Spjd free(bp->bio_driver2, M_ELI); 229159307Spjd bp->bio_driver2 = NULL; 230159307Spjd if (bp->bio_error != 0) { 231159307Spjd if (bp->bio_error == -1) 232159307Spjd bp->bio_error = EINVAL; 233159307Spjd else { 234159307Spjd G_ELI_LOGREQ(0, bp, 235159307Spjd "Crypto READ request failed (error=%d).", 236159307Spjd bp->bio_error); 237159307Spjd } 238159307Spjd bp->bio_completed = 0; 239159307Spjd } 240159307Spjd /* 241159307Spjd * Read is finished, send it up. 242159307Spjd */ 243159307Spjd g_io_deliver(bp, bp->bio_error); 244214118Spjd atomic_subtract_int(&sc->sc_inflight, 1); 245159307Spjd return (0); 246159307Spjd} 247159307Spjd 248159307Spjd/* 249159307Spjd * The function is called after data encryption. 250159307Spjd * 251159307Spjd * g_eli_start -> g_eli_auth_run -> G_ELI_AUTH_WRITE_DONE -> g_io_request -> g_eli_write_done -> g_io_deliver 252159307Spjd */ 253159307Spjdstatic int 254159307Spjdg_eli_auth_write_done(struct cryptop *crp) 255159307Spjd{ 256159307Spjd struct g_eli_softc *sc; 257159307Spjd struct g_consumer *cp; 258159307Spjd struct bio *bp, *cbp, *cbp2; 259159307Spjd u_int nsec; 260159307Spjd 261159307Spjd if (crp->crp_etype == EAGAIN) { 262159307Spjd if (g_eli_crypto_rerun(crp) == 0) 263159307Spjd return (0); 264159307Spjd } 265159307Spjd bp = (struct bio *)crp->crp_opaque; 266159307Spjd bp->bio_inbed++; 267159307Spjd if (crp->crp_etype == 0) { 268159307Spjd G_ELI_DEBUG(3, "Crypto WRITE request done (%d/%d).", 269159307Spjd bp->bio_inbed, bp->bio_children); 270159307Spjd } else { 271159307Spjd G_ELI_DEBUG(1, "Crypto WRITE request failed (%d/%d) error=%d.", 272159307Spjd bp->bio_inbed, bp->bio_children, crp->crp_etype); 273159307Spjd if (bp->bio_error == 0) 274159307Spjd bp->bio_error = crp->crp_etype; 275159307Spjd } 276220922Spjd sc = bp->bio_to->geom->softc; 277220922Spjd g_eli_key_drop(sc, crp->crp_desc->crd_key); 278159307Spjd /* 279159307Spjd * All sectors are already encrypted? 280159307Spjd */ 281159307Spjd if (bp->bio_inbed < bp->bio_children) 282159307Spjd return (0); 283159307Spjd if (bp->bio_error != 0) { 284159307Spjd G_ELI_LOGREQ(0, bp, "Crypto WRITE request failed (error=%d).", 285159307Spjd bp->bio_error); 286159307Spjd free(bp->bio_driver2, M_ELI); 287159307Spjd bp->bio_driver2 = NULL; 288159307Spjd cbp = bp->bio_driver1; 289159307Spjd bp->bio_driver1 = NULL; 290159307Spjd g_destroy_bio(cbp); 291159307Spjd g_io_deliver(bp, bp->bio_error); 292214118Spjd atomic_subtract_int(&sc->sc_inflight, 1); 293159307Spjd return (0); 294159307Spjd } 295159307Spjd cp = LIST_FIRST(&sc->sc_geom->consumer); 296159307Spjd cbp = bp->bio_driver1; 297159307Spjd bp->bio_driver1 = NULL; 298159307Spjd cbp->bio_to = cp->provider; 299159307Spjd cbp->bio_done = g_eli_write_done; 300159307Spjd 301159307Spjd /* Number of sectors from decrypted provider, eg. 1. */ 302159307Spjd nsec = bp->bio_length / bp->bio_to->sectorsize; 303159307Spjd /* Number of sectors from encrypted provider, eg. 9. */ 304159307Spjd nsec = (nsec * sc->sc_bytes_per_sector) / cp->provider->sectorsize; 305159307Spjd 306159307Spjd cbp->bio_length = cp->provider->sectorsize * nsec; 307159307Spjd cbp->bio_offset = (bp->bio_offset / bp->bio_to->sectorsize) * sc->sc_bytes_per_sector; 308159307Spjd cbp->bio_data = bp->bio_driver2; 309159307Spjd 310159307Spjd /* 311159307Spjd * We write more than what is requested, so we have to be ready to write 312159307Spjd * more than MAXPHYS. 313159307Spjd */ 314159307Spjd cbp2 = NULL; 315159307Spjd if (cbp->bio_length > MAXPHYS) { 316159307Spjd cbp2 = g_duplicate_bio(bp); 317159307Spjd cbp2->bio_length = cbp->bio_length - MAXPHYS; 318159307Spjd cbp2->bio_data = cbp->bio_data + MAXPHYS; 319159307Spjd cbp2->bio_offset = cbp->bio_offset + MAXPHYS; 320159307Spjd cbp2->bio_to = cp->provider; 321159307Spjd cbp2->bio_done = g_eli_write_done; 322159307Spjd cbp->bio_length = MAXPHYS; 323159307Spjd } 324159307Spjd /* 325159307Spjd * Send encrypted data to the provider. 326159307Spjd */ 327159307Spjd G_ELI_LOGREQ(2, cbp, "Sending request."); 328159307Spjd bp->bio_inbed = 0; 329159307Spjd bp->bio_children = (cbp2 != NULL ? 2 : 1); 330159307Spjd g_io_request(cbp, cp); 331159307Spjd if (cbp2 != NULL) { 332159307Spjd G_ELI_LOGREQ(2, cbp2, "Sending request."); 333159307Spjd g_io_request(cbp2, cp); 334159307Spjd } 335159307Spjd return (0); 336159307Spjd} 337159307Spjd 338159307Spjdvoid 339159307Spjdg_eli_auth_read(struct g_eli_softc *sc, struct bio *bp) 340159307Spjd{ 341159307Spjd struct g_consumer *cp; 342159307Spjd struct bio *cbp, *cbp2; 343159307Spjd size_t size; 344159307Spjd off_t nsec; 345159307Spjd 346159307Spjd bp->bio_pflags = 0; 347159307Spjd 348159307Spjd cp = LIST_FIRST(&sc->sc_geom->consumer); 349159307Spjd cbp = bp->bio_driver1; 350159307Spjd bp->bio_driver1 = NULL; 351159307Spjd cbp->bio_to = cp->provider; 352159307Spjd cbp->bio_done = g_eli_read_done; 353159307Spjd 354159307Spjd /* Number of sectors from decrypted provider, eg. 1. */ 355159307Spjd nsec = bp->bio_length / bp->bio_to->sectorsize; 356159307Spjd /* Number of sectors from encrypted provider, eg. 9. */ 357159307Spjd nsec = (nsec * sc->sc_bytes_per_sector) / cp->provider->sectorsize; 358159307Spjd 359159307Spjd cbp->bio_length = cp->provider->sectorsize * nsec; 360159307Spjd size = cbp->bio_length; 361159307Spjd size += sc->sc_alen * nsec; 362159307Spjd size += sizeof(struct cryptop) * nsec; 363159307Spjd size += sizeof(struct cryptodesc) * nsec * 2; 364159307Spjd size += G_ELI_AUTH_SECKEYLEN * nsec; 365159307Spjd size += sizeof(struct uio) * nsec; 366159307Spjd size += sizeof(struct iovec) * nsec; 367159307Spjd cbp->bio_offset = (bp->bio_offset / bp->bio_to->sectorsize) * sc->sc_bytes_per_sector; 368159307Spjd bp->bio_driver2 = malloc(size, M_ELI, M_WAITOK); 369159307Spjd cbp->bio_data = bp->bio_driver2; 370159307Spjd 371159307Spjd /* 372159307Spjd * We read more than what is requested, so we have to be ready to read 373159307Spjd * more than MAXPHYS. 374159307Spjd */ 375159307Spjd cbp2 = NULL; 376159307Spjd if (cbp->bio_length > MAXPHYS) { 377159307Spjd cbp2 = g_duplicate_bio(bp); 378159307Spjd cbp2->bio_length = cbp->bio_length - MAXPHYS; 379159307Spjd cbp2->bio_data = cbp->bio_data + MAXPHYS; 380159307Spjd cbp2->bio_offset = cbp->bio_offset + MAXPHYS; 381159307Spjd cbp2->bio_to = cp->provider; 382159307Spjd cbp2->bio_done = g_eli_read_done; 383159307Spjd cbp->bio_length = MAXPHYS; 384159307Spjd } 385159307Spjd /* 386159307Spjd * Read encrypted data from provider. 387159307Spjd */ 388159307Spjd G_ELI_LOGREQ(2, cbp, "Sending request."); 389159307Spjd g_io_request(cbp, cp); 390159307Spjd if (cbp2 != NULL) { 391159307Spjd G_ELI_LOGREQ(2, cbp2, "Sending request."); 392159307Spjd g_io_request(cbp2, cp); 393159307Spjd } 394159307Spjd} 395159307Spjd 396159307Spjd/* 397159307Spjd * This is the main function responsible for cryptography (ie. communication 398159307Spjd * with crypto(9) subsystem). 399214116Spjd * 400214116Spjd * BIO_READ: 401214116Spjd * g_eli_start -> g_eli_auth_read -> g_io_request -> g_eli_read_done -> G_ELI_AUTH_RUN -> g_eli_auth_read_done -> g_io_deliver 402214116Spjd * BIO_WRITE: 403214116Spjd * g_eli_start -> G_ELI_AUTH_RUN -> g_eli_auth_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 404159307Spjd */ 405159307Spjdvoid 406159307Spjdg_eli_auth_run(struct g_eli_worker *wr, struct bio *bp) 407159307Spjd{ 408159307Spjd struct g_eli_softc *sc; 409159307Spjd struct cryptop *crp; 410159307Spjd struct cryptodesc *crde, *crda; 411159307Spjd struct uio *uio; 412159307Spjd struct iovec *iov; 413159307Spjd u_int i, lsec, nsec, data_secsize, decr_secsize, encr_secsize; 414159307Spjd off_t dstoff; 415159307Spjd int err, error; 416159307Spjd u_char *p, *data, *auth, *authkey, *plaindata; 417159307Spjd 418159307Spjd G_ELI_LOGREQ(3, bp, "%s", __func__); 419159307Spjd 420159307Spjd bp->bio_pflags = wr->w_number; 421159307Spjd sc = wr->w_softc; 422159307Spjd /* Sectorsize of decrypted provider eg. 4096. */ 423159307Spjd decr_secsize = bp->bio_to->sectorsize; 424159307Spjd /* The real sectorsize of encrypted provider, eg. 512. */ 425159307Spjd encr_secsize = LIST_FIRST(&sc->sc_geom->consumer)->provider->sectorsize; 426159307Spjd /* Number of data bytes in one encrypted sector, eg. 480. */ 427159307Spjd data_secsize = sc->sc_data_per_sector; 428159307Spjd /* Number of sectors from decrypted provider, eg. 2. */ 429159307Spjd nsec = bp->bio_length / decr_secsize; 430159307Spjd /* Number of sectors from encrypted provider, eg. 18. */ 431159307Spjd nsec = (nsec * sc->sc_bytes_per_sector) / encr_secsize; 432159307Spjd /* Last sector number in every big sector, eg. 9. */ 433159307Spjd lsec = sc->sc_bytes_per_sector / encr_secsize; 434159307Spjd /* Destination offset, used for IV generation. */ 435159307Spjd dstoff = (bp->bio_offset / bp->bio_to->sectorsize) * sc->sc_bytes_per_sector; 436159307Spjd 437159343Spjd auth = NULL; /* Silence compiler warning. */ 438159307Spjd plaindata = bp->bio_data; 439159307Spjd if (bp->bio_cmd == BIO_READ) { 440159307Spjd data = bp->bio_driver2; 441159307Spjd auth = data + encr_secsize * nsec; 442159307Spjd p = auth + sc->sc_alen * nsec; 443159307Spjd } else { 444159307Spjd size_t size; 445159307Spjd 446159307Spjd size = encr_secsize * nsec; 447159307Spjd size += sizeof(*crp) * nsec; 448159307Spjd size += sizeof(*crde) * nsec; 449159307Spjd size += sizeof(*crda) * nsec; 450159307Spjd size += G_ELI_AUTH_SECKEYLEN * nsec; 451159307Spjd size += sizeof(*uio) * nsec; 452159307Spjd size += sizeof(*iov) * nsec; 453159307Spjd data = malloc(size, M_ELI, M_WAITOK); 454159307Spjd bp->bio_driver2 = data; 455159307Spjd p = data + encr_secsize * nsec; 456159307Spjd } 457159307Spjd bp->bio_inbed = 0; 458159307Spjd bp->bio_children = nsec; 459159307Spjd 460159307Spjd error = 0; 461159307Spjd for (i = 1; i <= nsec; i++, dstoff += encr_secsize) { 462159307Spjd crp = (struct cryptop *)p; p += sizeof(*crp); 463159307Spjd crde = (struct cryptodesc *)p; p += sizeof(*crde); 464159307Spjd crda = (struct cryptodesc *)p; p += sizeof(*crda); 465159307Spjd authkey = (u_char *)p; p += G_ELI_AUTH_SECKEYLEN; 466159307Spjd uio = (struct uio *)p; p += sizeof(*uio); 467159307Spjd iov = (struct iovec *)p; p += sizeof(*iov); 468159307Spjd 469159307Spjd data_secsize = sc->sc_data_per_sector; 470159307Spjd if ((i % lsec) == 0) 471159307Spjd data_secsize = decr_secsize % data_secsize; 472159307Spjd 473159307Spjd if (bp->bio_cmd == BIO_READ) { 474159307Spjd /* Remember read HMAC. */ 475159307Spjd bcopy(data, auth, sc->sc_alen); 476159307Spjd auth += sc->sc_alen; 477159307Spjd /* TODO: bzero(9) can be commented out later. */ 478159307Spjd bzero(data, sc->sc_alen); 479159307Spjd } else { 480159307Spjd bcopy(plaindata, data + sc->sc_alen, data_secsize); 481159307Spjd plaindata += data_secsize; 482159307Spjd } 483159307Spjd 484159307Spjd iov->iov_len = sc->sc_alen + data_secsize; 485159307Spjd iov->iov_base = data; 486159307Spjd data += encr_secsize; 487159307Spjd 488159307Spjd uio->uio_iov = iov; 489159307Spjd uio->uio_iovcnt = 1; 490159307Spjd uio->uio_segflg = UIO_SYSSPACE; 491159307Spjd uio->uio_resid = iov->iov_len; 492159307Spjd 493159307Spjd crp->crp_sid = wr->w_sid; 494159343Spjd crp->crp_ilen = uio->uio_resid; 495160569Spjd crp->crp_olen = data_secsize; 496159307Spjd crp->crp_opaque = (void *)bp; 497159307Spjd crp->crp_buf = (void *)uio; 498159307Spjd crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIFSYNC | CRYPTO_F_REL; 499159307Spjd if (g_eli_batch) 500159307Spjd crp->crp_flags |= CRYPTO_F_BATCH; 501159307Spjd if (bp->bio_cmd == BIO_WRITE) { 502159307Spjd crp->crp_callback = g_eli_auth_write_done; 503159307Spjd crp->crp_desc = crde; 504159307Spjd crde->crd_next = crda; 505159307Spjd crda->crd_next = NULL; 506159307Spjd } else { 507159307Spjd crp->crp_callback = g_eli_auth_read_done; 508159307Spjd crp->crp_desc = crda; 509159307Spjd crda->crd_next = crde; 510159307Spjd crde->crd_next = NULL; 511159307Spjd } 512159307Spjd 513159307Spjd crde->crd_skip = sc->sc_alen; 514159307Spjd crde->crd_len = data_secsize; 515159307Spjd crde->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT; 516221628Spjd if ((sc->sc_flags & G_ELI_FLAG_FIRST_KEY) == 0) 517221628Spjd crde->crd_flags |= CRD_F_KEY_EXPLICIT; 518159307Spjd if (bp->bio_cmd == BIO_WRITE) 519159307Spjd crde->crd_flags |= CRD_F_ENCRYPT; 520159307Spjd crde->crd_alg = sc->sc_ealgo; 521220922Spjd crde->crd_key = g_eli_key_hold(sc, dstoff, encr_secsize); 522159307Spjd crde->crd_klen = sc->sc_ekeylen; 523213070Spjd if (sc->sc_ealgo == CRYPTO_AES_XTS) 524213070Spjd crde->crd_klen <<= 1; 525159307Spjd g_eli_crypto_ivgen(sc, dstoff, crde->crd_iv, 526159307Spjd sizeof(crde->crd_iv)); 527159307Spjd 528159307Spjd crda->crd_skip = sc->sc_alen; 529159307Spjd crda->crd_len = data_secsize; 530159307Spjd crda->crd_inject = 0; 531159307Spjd crda->crd_flags = CRD_F_KEY_EXPLICIT; 532159307Spjd crda->crd_alg = sc->sc_aalgo; 533159307Spjd g_eli_auth_keygen(sc, dstoff, authkey); 534159307Spjd crda->crd_key = authkey; 535159307Spjd crda->crd_klen = G_ELI_AUTH_SECKEYLEN * 8; 536159307Spjd 537159307Spjd crp->crp_etype = 0; 538159307Spjd err = crypto_dispatch(crp); 539159307Spjd if (err != 0 && error == 0) 540159307Spjd error = err; 541159307Spjd } 542159307Spjd if (bp->bio_error == 0) 543159307Spjd bp->bio_error = error; 544159307Spjd} 545