diff options
Diffstat (limited to '')
| -rw-r--r-- | src/cred.c | 1230 |
1 files changed, 1230 insertions, 0 deletions
diff --git a/src/cred.c b/src/cred.c new file mode 100644 index 0000000..4a7a725 --- /dev/null +++ b/src/cred.c @@ -0,0 +1,1230 @@ +/* + * Copyright (c) 2018-2022 Yubico AB. All rights reserved. + * Use of this source code is governed by a BSD-style + * license that can be found in the LICENSE file. + * SPDX-License-Identifier: BSD-2-Clause + */ + +#include <openssl/sha.h> +#include <openssl/x509.h> + +#include "fido.h" +#include "fido/es256.h" + +#ifndef FIDO_MAXMSG_CRED +#define FIDO_MAXMSG_CRED 4096 +#endif + +static int +parse_makecred_reply(const cbor_item_t *key, const cbor_item_t *val, void *arg) +{ + fido_cred_t *cred = arg; + + if (cbor_isa_uint(key) == false || + cbor_int_get_width(key) != CBOR_INT_8) { + fido_log_debug("%s: cbor type", __func__); + return (0); /* ignore */ + } + + switch (cbor_get_uint8(key)) { + case 1: /* fmt */ + return (cbor_decode_fmt(val, &cred->fmt)); + case 2: /* authdata */ + if (fido_blob_decode(val, &cred->authdata_raw) < 0) { + fido_log_debug("%s: fido_blob_decode", __func__); + return (-1); + } + return (cbor_decode_cred_authdata(val, cred->type, + &cred->authdata_cbor, &cred->authdata, &cred->attcred, + &cred->authdata_ext)); + case 3: /* attestation statement */ + return (cbor_decode_attstmt(val, &cred->attstmt)); + case 5: /* large blob key */ + return (fido_blob_decode(val, &cred->largeblob_key)); + default: /* ignore */ + fido_log_debug("%s: cbor type", __func__); + return (0); + } +} + +static int +fido_dev_make_cred_tx(fido_dev_t *dev, fido_cred_t *cred, const char *pin, + int *ms) +{ + fido_blob_t f; + fido_blob_t *ecdh = NULL; + fido_opt_t uv = cred->uv; + es256_pk_t *pk = NULL; + cbor_item_t *argv[9]; + const uint8_t cmd = CTAP_CBOR_MAKECRED; + int r; + + memset(&f, 0, sizeof(f)); + memset(argv, 0, sizeof(argv)); + + if (cred->cdh.ptr == NULL || cred->type == 0) { + fido_log_debug("%s: cdh=%p, type=%d", __func__, + (void *)cred->cdh.ptr, cred->type); + r = FIDO_ERR_INVALID_ARGUMENT; + goto fail; + } + + if ((argv[0] = fido_blob_encode(&cred->cdh)) == NULL || + (argv[1] = cbor_encode_rp_entity(&cred->rp)) == NULL || + (argv[2] = cbor_encode_user_entity(&cred->user)) == NULL || + (argv[3] = cbor_encode_pubkey_param(cred->type)) == NULL) { + fido_log_debug("%s: cbor encode", __func__); + r = FIDO_ERR_INTERNAL; + goto fail; + } + + /* excluded credentials */ + if (cred->excl.len) + if ((argv[4] = cbor_encode_pubkey_list(&cred->excl)) == NULL) { + fido_log_debug("%s: cbor_encode_pubkey_list", __func__); + r = FIDO_ERR_INTERNAL; + goto fail; + } + + /* extensions */ + if (cred->ext.mask) + if ((argv[5] = cbor_encode_cred_ext(&cred->ext, + &cred->blob)) == NULL) { + fido_log_debug("%s: cbor_encode_cred_ext", __func__); + r = FIDO_ERR_INTERNAL; + goto fail; + } + + /* user verification */ + if (pin != NULL || (uv == FIDO_OPT_TRUE && + fido_dev_supports_permissions(dev))) { + if ((r = fido_do_ecdh(dev, &pk, &ecdh, ms)) != FIDO_OK) { + fido_log_debug("%s: fido_do_ecdh", __func__); + goto fail; + } + if ((r = cbor_add_uv_params(dev, cmd, &cred->cdh, pk, ecdh, + pin, cred->rp.id, &argv[7], &argv[8], ms)) != FIDO_OK) { + fido_log_debug("%s: cbor_add_uv_params", __func__); + goto fail; + } + uv = FIDO_OPT_OMIT; + } + + /* options */ + if (cred->rk != FIDO_OPT_OMIT || uv != FIDO_OPT_OMIT) + if ((argv[6] = cbor_encode_cred_opt(cred->rk, uv)) == NULL) { + fido_log_debug("%s: cbor_encode_cred_opt", __func__); + r = FIDO_ERR_INTERNAL; + goto fail; + } + + /* framing and transmission */ + if (cbor_build_frame(cmd, argv, nitems(argv), &f) < 0 || + fido_tx(dev, CTAP_CMD_CBOR, f.ptr, f.len, ms) < 0) { + fido_log_debug("%s: fido_tx", __func__); + r = FIDO_ERR_TX; + goto fail; + } + + r = FIDO_OK; +fail: + es256_pk_free(&pk); + fido_blob_free(&ecdh); + cbor_vector_free(argv, nitems(argv)); + free(f.ptr); + + return (r); +} + +static int +fido_dev_make_cred_rx(fido_dev_t *dev, fido_cred_t *cred, int *ms) +{ + unsigned char *reply; + int reply_len; + int r; + + fido_cred_reset_rx(cred); + + if ((reply = malloc(FIDO_MAXMSG_CRED)) == NULL) { + r = FIDO_ERR_INTERNAL; + goto fail; + } + + if ((reply_len = fido_rx(dev, CTAP_CMD_CBOR, reply, FIDO_MAXMSG_CRED, + ms)) < 0) { + fido_log_debug("%s: fido_rx", __func__); + r = FIDO_ERR_RX; + goto fail; + } + + if ((r = cbor_parse_reply(reply, (size_t)reply_len, cred, + parse_makecred_reply)) != FIDO_OK) { + fido_log_debug("%s: parse_makecred_reply", __func__); + goto fail; + } + + if (cred->fmt == NULL || fido_blob_is_empty(&cred->authdata_cbor) || + fido_blob_is_empty(&cred->attcred.id)) { + r = FIDO_ERR_INVALID_CBOR; + goto fail; + } + + r = FIDO_OK; +fail: + free(reply); + + if (r != FIDO_OK) + fido_cred_reset_rx(cred); + + return (r); +} + +static int +fido_dev_make_cred_wait(fido_dev_t *dev, fido_cred_t *cred, const char *pin, + int *ms) +{ + int r; + + if ((r = fido_dev_make_cred_tx(dev, cred, pin, ms)) != FIDO_OK || + (r = fido_dev_make_cred_rx(dev, cred, ms)) != FIDO_OK) + return (r); + + return (FIDO_OK); +} + +int +fido_dev_make_cred(fido_dev_t *dev, fido_cred_t *cred, const char *pin) +{ + int ms = dev->timeout_ms; + +#ifdef USE_WINHELLO + if (dev->flags & FIDO_DEV_WINHELLO) + return (fido_winhello_make_cred(dev, cred, pin, ms)); +#endif + if (fido_dev_is_fido2(dev) == false) { + if (pin != NULL || cred->rk == FIDO_OPT_TRUE || + cred->ext.mask != 0) + return (FIDO_ERR_UNSUPPORTED_OPTION); + return (u2f_register(dev, cred, &ms)); + } + + return (fido_dev_make_cred_wait(dev, cred, pin, &ms)); +} + +static int +check_extensions(const fido_cred_ext_t *authdata_ext, + const fido_cred_ext_t *ext) +{ + fido_cred_ext_t tmp; + + /* XXX: largeBlobKey is not part of the extensions map */ + memcpy(&tmp, ext, sizeof(tmp)); + tmp.mask &= ~FIDO_EXT_LARGEBLOB_KEY; + + return (timingsafe_bcmp(authdata_ext, &tmp, sizeof(*authdata_ext))); +} + +int +fido_check_rp_id(const char *id, const unsigned char *obtained_hash) +{ + unsigned char expected_hash[SHA256_DIGEST_LENGTH]; + + explicit_bzero(expected_hash, sizeof(expected_hash)); + + if (SHA256((const unsigned char *)id, strlen(id), + expected_hash) != expected_hash) { + fido_log_debug("%s: sha256", __func__); + return (-1); + } + + return (timingsafe_bcmp(expected_hash, obtained_hash, + SHA256_DIGEST_LENGTH)); +} + +static int +get_signed_hash_u2f(fido_blob_t *dgst, const unsigned char *rp_id, + size_t rp_id_len, const fido_blob_t *clientdata, const fido_blob_t *id, + const es256_pk_t *pk) +{ + const uint8_t zero = 0; + const uint8_t four = 4; /* uncompressed point */ + const EVP_MD *md = NULL; + EVP_MD_CTX *ctx = NULL; + int ok = -1; + + if (dgst->len < SHA256_DIGEST_LENGTH || + (md = EVP_sha256()) == NULL || + (ctx = EVP_MD_CTX_new()) == NULL || + EVP_DigestInit_ex(ctx, md, NULL) != 1 || + EVP_DigestUpdate(ctx, &zero, sizeof(zero)) != 1 || + EVP_DigestUpdate(ctx, rp_id, rp_id_len) != 1 || + EVP_DigestUpdate(ctx, clientdata->ptr, clientdata->len) != 1 || + EVP_DigestUpdate(ctx, id->ptr, id->len) != 1 || + EVP_DigestUpdate(ctx, &four, sizeof(four)) != 1 || + EVP_DigestUpdate(ctx, pk->x, sizeof(pk->x)) != 1 || + EVP_DigestUpdate(ctx, pk->y, sizeof(pk->y)) != 1 || + EVP_DigestFinal_ex(ctx, dgst->ptr, NULL) != 1) { + fido_log_debug("%s: sha256", __func__); + goto fail; + } + dgst->len = SHA256_DIGEST_LENGTH; + + ok = 0; +fail: + EVP_MD_CTX_free(ctx); + + return (ok); +} + +static int +verify_attstmt(const fido_blob_t *dgst, const fido_attstmt_t *attstmt) +{ + BIO *rawcert = NULL; + X509 *cert = NULL; + EVP_PKEY *pkey = NULL; + int ok = -1; + + /* openssl needs ints */ + if (attstmt->x5c.len > INT_MAX) { + fido_log_debug("%s: x5c.len=%zu", __func__, attstmt->x5c.len); + return (-1); + } + + /* fetch key from x509 */ + if ((rawcert = BIO_new_mem_buf(attstmt->x5c.ptr, + (int)attstmt->x5c.len)) == NULL || + (cert = d2i_X509_bio(rawcert, NULL)) == NULL || + (pkey = X509_get_pubkey(cert)) == NULL) { + fido_log_debug("%s: x509 key", __func__); + goto fail; + } + + switch (attstmt->alg) { + case COSE_UNSPEC: + case COSE_ES256: + ok = es256_verify_sig(dgst, pkey, &attstmt->sig); + break; + case COSE_ES384: + ok = es384_verify_sig(dgst, pkey, &attstmt->sig); + break; + case COSE_RS256: + ok = rs256_verify_sig(dgst, pkey, &attstmt->sig); + break; + case COSE_RS1: + ok = rs1_verify_sig(dgst, pkey, &attstmt->sig); + break; + case COSE_EDDSA: + ok = eddsa_verify_sig(dgst, pkey, &attstmt->sig); + break; + default: + fido_log_debug("%s: unknown alg %d", __func__, attstmt->alg); + break; + } + +fail: + BIO_free(rawcert); + X509_free(cert); + EVP_PKEY_free(pkey); + + return (ok); +} + +int +fido_cred_verify(const fido_cred_t *cred) +{ + unsigned char buf[1024]; /* XXX */ + fido_blob_t dgst; + int cose_alg; + int r; + + dgst.ptr = buf; + dgst.len = sizeof(buf); + + /* do we have everything we need? */ + if (cred->cdh.ptr == NULL || cred->authdata_cbor.ptr == NULL || + cred->attstmt.x5c.ptr == NULL || cred->attstmt.sig.ptr == NULL || + cred->fmt == NULL || cred->attcred.id.ptr == NULL || + cred->rp.id == NULL) { + fido_log_debug("%s: cdh=%p, authdata=%p, x5c=%p, sig=%p, " + "fmt=%p id=%p, rp.id=%s", __func__, (void *)cred->cdh.ptr, + (void *)cred->authdata_cbor.ptr, + (void *)cred->attstmt.x5c.ptr, + (void *)cred->attstmt.sig.ptr, (void *)cred->fmt, + (void *)cred->attcred.id.ptr, cred->rp.id); + r = FIDO_ERR_INVALID_ARGUMENT; + goto out; + } + + if (fido_check_rp_id(cred->rp.id, cred->authdata.rp_id_hash) != 0) { + fido_log_debug("%s: fido_check_rp_id", __func__); + r = FIDO_ERR_INVALID_PARAM; + goto out; + } + + if (fido_check_flags(cred->authdata.flags, FIDO_OPT_TRUE, + cred->uv) < 0) { + fido_log_debug("%s: fido_check_flags", __func__); + r = FIDO_ERR_INVALID_PARAM; + goto out; + } + + if (check_extensions(&cred->authdata_ext, &cred->ext) != 0) { + fido_log_debug("%s: check_extensions", __func__); + r = FIDO_ERR_INVALID_PARAM; + goto out; + } + + if ((cose_alg = cred->attstmt.alg) == COSE_UNSPEC) + cose_alg = COSE_ES256; /* backwards compat */ + + if (!strcmp(cred->fmt, "packed")) { + if (fido_get_signed_hash(cose_alg, &dgst, &cred->cdh, + &cred->authdata_cbor) < 0) { + fido_log_debug("%s: fido_get_signed_hash", __func__); + r = FIDO_ERR_INTERNAL; + goto out; + } + } else if (!strcmp(cred->fmt, "fido-u2f")) { + if (get_signed_hash_u2f(&dgst, cred->authdata.rp_id_hash, + sizeof(cred->authdata.rp_id_hash), &cred->cdh, + &cred->attcred.id, &cred->attcred.pubkey.es256) < 0) { + fido_log_debug("%s: get_signed_hash_u2f", __func__); + r = FIDO_ERR_INTERNAL; + goto out; + } + } else if (!strcmp(cred->fmt, "tpm")) { + if (fido_get_signed_hash_tpm(&dgst, &cred->cdh, + &cred->authdata_raw, &cred->attstmt, &cred->attcred) < 0) { + fido_log_debug("%s: fido_get_signed_hash_tpm", __func__); + r = FIDO_ERR_INTERNAL; + goto out; + } + } else { + fido_log_debug("%s: unknown fmt %s", __func__, cred->fmt); + r = FIDO_ERR_INVALID_ARGUMENT; + goto out; + } + + if (verify_attstmt(&dgst, &cred->attstmt) < 0) { + fido_log_debug("%s: verify_attstmt", __func__); + r = FIDO_ERR_INVALID_SIG; + goto out; + } + + r = FIDO_OK; +out: + explicit_bzero(buf, sizeof(buf)); + + return (r); +} + +int +fido_cred_verify_self(const fido_cred_t *cred) +{ + unsigned char buf[1024]; /* XXX */ + fido_blob_t dgst; + int ok = -1; + int r; + + dgst.ptr = buf; + dgst.len = sizeof(buf); + + /* do we have everything we need? */ + if (cred->cdh.ptr == NULL || cred->authdata_cbor.ptr == NULL || + cred->attstmt.x5c.ptr != NULL || cred->attstmt.sig.ptr == NULL || + cred->fmt == NULL || cred->attcred.id.ptr == NULL || + cred->rp.id == NULL) { + fido_log_debug("%s: cdh=%p, authdata=%p, x5c=%p, sig=%p, " + "fmt=%p id=%p, rp.id=%s", __func__, (void *)cred->cdh.ptr, + (void *)cred->authdata_cbor.ptr, + (void *)cred->attstmt.x5c.ptr, + (void *)cred->attstmt.sig.ptr, (void *)cred->fmt, + (void *)cred->attcred.id.ptr, cred->rp.id); + r = FIDO_ERR_INVALID_ARGUMENT; + goto out; + } + + if (fido_check_rp_id(cred->rp.id, cred->authdata.rp_id_hash) != 0) { + fido_log_debug("%s: fido_check_rp_id", __func__); + r = FIDO_ERR_INVALID_PARAM; + goto out; + } + + if (fido_check_flags(cred->authdata.flags, FIDO_OPT_TRUE, + cred->uv) < 0) { + fido_log_debug("%s: fido_check_flags", __func__); + r = FIDO_ERR_INVALID_PARAM; + goto out; + } + + if (check_extensions(&cred->authdata_ext, &cred->ext) != 0) { + fido_log_debug("%s: check_extensions", __func__); + r = FIDO_ERR_INVALID_PARAM; + goto out; + } + + if (!strcmp(cred->fmt, "packed")) { + if (fido_get_signed_hash(cred->attcred.type, &dgst, &cred->cdh, + &cred->authdata_cbor) < 0) { + fido_log_debug("%s: fido_get_signed_hash", __func__); + r = FIDO_ERR_INTERNAL; + goto out; + } + } else if (!strcmp(cred->fmt, "fido-u2f")) { + if (get_signed_hash_u2f(&dgst, cred->authdata.rp_id_hash, + sizeof(cred->authdata.rp_id_hash), &cred->cdh, + &cred->attcred.id, &cred->attcred.pubkey.es256) < 0) { + fido_log_debug("%s: get_signed_hash_u2f", __func__); + r = FIDO_ERR_INTERNAL; + goto out; + } + } else { + fido_log_debug("%s: unknown fmt %s", __func__, cred->fmt); + r = FIDO_ERR_INVALID_ARGUMENT; + goto out; + } + + switch (cred->attcred.type) { + case COSE_ES256: + ok = es256_pk_verify_sig(&dgst, &cred->attcred.pubkey.es256, + &cred->attstmt.sig); + break; + case COSE_ES384: + ok = es384_pk_verify_sig(&dgst, &cred->attcred.pubkey.es384, + &cred->attstmt.sig); + break; + case COSE_RS256: + ok = rs256_pk_verify_sig(&dgst, &cred->attcred.pubkey.rs256, + &cred->attstmt.sig); + break; + case COSE_EDDSA: + ok = eddsa_pk_verify_sig(&dgst, &cred->attcred.pubkey.eddsa, + &cred->attstmt.sig); + break; + default: + fido_log_debug("%s: unsupported cose_alg %d", __func__, + cred->attcred.type); + r = FIDO_ERR_UNSUPPORTED_OPTION; + goto out; + } + + if (ok < 0) + r = FIDO_ERR_INVALID_SIG; + else + r = FIDO_OK; + +out: + explicit_bzero(buf, sizeof(buf)); + + return (r); +} + +fido_cred_t * +fido_cred_new(void) +{ + return (calloc(1, sizeof(fido_cred_t))); +} + +static void +fido_cred_clean_authdata(fido_cred_t *cred) +{ + fido_blob_reset(&cred->authdata_cbor); + fido_blob_reset(&cred->authdata_raw); + fido_blob_reset(&cred->attcred.id); + + memset(&cred->authdata_ext, 0, sizeof(cred->authdata_ext)); + memset(&cred->authdata, 0, sizeof(cred->authdata)); + memset(&cred->attcred, 0, sizeof(cred->attcred)); +} + +static void +fido_cred_clean_attstmt(fido_attstmt_t *attstmt) +{ + fido_blob_reset(&attstmt->certinfo); + fido_blob_reset(&attstmt->pubarea); + fido_blob_reset(&attstmt->cbor); + fido_blob_reset(&attstmt->x5c); + fido_blob_reset(&attstmt->sig); + + memset(attstmt, 0, sizeof(*attstmt)); +} + +void +fido_cred_reset_tx(fido_cred_t *cred) +{ + fido_blob_reset(&cred->cd); + fido_blob_reset(&cred->cdh); + fido_blob_reset(&cred->user.id); + fido_blob_reset(&cred->blob); + + free(cred->rp.id); + free(cred->rp.name); + free(cred->user.icon); + free(cred->user.name); + free(cred->user.display_name); + fido_cred_empty_exclude_list(cred); + + memset(&cred->rp, 0, sizeof(cred->rp)); + memset(&cred->user, 0, sizeof(cred->user)); + memset(&cred->ext, 0, sizeof(cred->ext)); + + cred->type = 0; + cred->rk = FIDO_OPT_OMIT; + cred->uv = FIDO_OPT_OMIT; +} + +void +fido_cred_reset_rx(fido_cred_t *cred) +{ + free(cred->fmt); + cred->fmt = NULL; + fido_cred_clean_authdata(cred); + fido_cred_clean_attstmt(&cred->attstmt); + fido_blob_reset(&cred->largeblob_key); +} + +void +fido_cred_free(fido_cred_t **cred_p) +{ + fido_cred_t *cred; + + if (cred_p == NULL || (cred = *cred_p) == NULL) + return; + fido_cred_reset_tx(cred); + fido_cred_reset_rx(cred); + free(cred); + *cred_p = NULL; +} + +int +fido_cred_set_authdata(fido_cred_t *cred, const unsigned char *ptr, size_t len) +{ + cbor_item_t *item = NULL; + struct cbor_load_result cbor; + int r = FIDO_ERR_INVALID_ARGUMENT; + + fido_cred_clean_authdata(cred); + + if (ptr == NULL || len == 0) + goto fail; + + if ((item = cbor_load(ptr, len, &cbor)) == NULL) { + fido_log_debug("%s: cbor_load", __func__); + goto fail; + } + + if (fido_blob_decode(item, &cred->authdata_raw) < 0) { + fido_log_debug("%s: fido_blob_decode", __func__); + goto fail; + } + + if (cbor_decode_cred_authdata(item, cred->type, &cred->authdata_cbor, + &cred->authdata, &cred->attcred, &cred->authdata_ext) < 0) { + fido_log_debug("%s: cbor_decode_cred_authdata", __func__); + goto fail; + } + + r = FIDO_OK; +fail: + if (item != NULL) + cbor_decref(&item); + + if (r != FIDO_OK) + fido_cred_clean_authdata(cred); + + return (r); +} + +int +fido_cred_set_authdata_raw(fido_cred_t *cred, const unsigned char *ptr, + size_t len) +{ + cbor_item_t *item = NULL; + int r = FIDO_ERR_INVALID_ARGUMENT; + + fido_cred_clean_authdata(cred); + + if (ptr == NULL || len == 0) + goto fail; + + if (fido_blob_set(&cred->authdata_raw, ptr, len) < 0) { + fido_log_debug("%s: fido_blob_set", __func__); + r = FIDO_ERR_INTERNAL; + goto fail; + } + + if ((item = cbor_build_bytestring(ptr, len)) == NULL) { + fido_log_debug("%s: cbor_build_bytestring", __func__); + r = FIDO_ERR_INTERNAL; + goto fail; + } + + if (cbor_decode_cred_authdata(item, cred->type, &cred->authdata_cbor, + &cred->authdata, &cred->attcred, &cred->authdata_ext) < 0) { + fido_log_debug("%s: cbor_decode_cred_authdata", __func__); + goto fail; + } + + r = FIDO_OK; +fail: + if (item != NULL) + cbor_decref(&item); + + if (r != FIDO_OK) + fido_cred_clean_authdata(cred); + + return (r); +} + +int +fido_cred_set_id(fido_cred_t *cred, const unsigned char *ptr, size_t len) +{ + if (fido_blob_set(&cred->attcred.id, ptr, len) < 0) + return (FIDO_ERR_INVALID_ARGUMENT); + + return (FIDO_OK); +} + +int +fido_cred_set_x509(fido_cred_t *cred, const unsigned char *ptr, size_t len) +{ + if (fido_blob_set(&cred->attstmt.x5c, ptr, len) < 0) + return (FIDO_ERR_INVALID_ARGUMENT); + + return (FIDO_OK); +} + +int +fido_cred_set_sig(fido_cred_t *cred, const unsigned char *ptr, size_t len) +{ + if (fido_blob_set(&cred->attstmt.sig, ptr, len) < 0) + return (FIDO_ERR_INVALID_ARGUMENT); + + return (FIDO_OK); +} + +int +fido_cred_set_attstmt(fido_cred_t *cred, const unsigned char *ptr, size_t len) +{ + cbor_item_t *item = NULL; + struct cbor_load_result cbor; + int r = FIDO_ERR_INVALID_ARGUMENT; + + fido_cred_clean_attstmt(&cred->attstmt); + + if (ptr == NULL || len == 0) + goto fail; + + if ((item = cbor_load(ptr, len, &cbor)) == NULL) { + fido_log_debug("%s: cbor_load", __func__); + goto fail; + } + + if (cbor_decode_attstmt(item, &cred->attstmt) < 0) { + fido_log_debug("%s: cbor_decode_attstmt", __func__); + goto fail; + } + + r = FIDO_OK; +fail: + if (item != NULL) + cbor_decref(&item); + + if (r != FIDO_OK) + fido_cred_clean_attstmt(&cred->attstmt); + + return (r); +} + +int +fido_cred_exclude(fido_cred_t *cred, const unsigned char *id_ptr, size_t id_len) +{ + fido_blob_t id_blob; + fido_blob_t *list_ptr; + + memset(&id_blob, 0, sizeof(id_blob)); + + if (fido_blob_set(&id_blob, id_ptr, id_len) < 0) + return (FIDO_ERR_INVALID_ARGUMENT); + + if (cred->excl.len == SIZE_MAX) { + free(id_blob.ptr); + return (FIDO_ERR_INVALID_ARGUMENT); + } + + if ((list_ptr = recallocarray(cred->excl.ptr, cred->excl.len, + cred->excl.len + 1, sizeof(fido_blob_t))) == NULL) { + free(id_blob.ptr); + return (FIDO_ERR_INTERNAL); + } + + list_ptr[cred->excl.len++] = id_blob; + cred->excl.ptr = list_ptr; + + return (FIDO_OK); +} + +int +fido_cred_empty_exclude_list(fido_cred_t *cred) +{ + fido_free_blob_array(&cred->excl); + memset(&cred->excl, 0, sizeof(cred->excl)); + + return (FIDO_OK); +} + +int +fido_cred_set_clientdata(fido_cred_t *cred, const unsigned char *data, + size_t data_len) +{ + if (!fido_blob_is_empty(&cred->cdh) || + fido_blob_set(&cred->cd, data, data_len) < 0) { + return (FIDO_ERR_INVALID_ARGUMENT); + } + if (fido_sha256(&cred->cdh, data, data_len) < 0) { + fido_blob_reset(&cred->cd); + return (FIDO_ERR_INTERNAL); + } + + return (FIDO_OK); +} + +int +fido_cred_set_clientdata_hash(fido_cred_t *cred, const unsigned char *hash, + size_t hash_len) +{ + if (!fido_blob_is_empty(&cred->cd) || + fido_blob_set(&cred->cdh, hash, hash_len) < 0) + return (FIDO_ERR_INVALID_ARGUMENT); + + return (FIDO_OK); +} + +int +fido_cred_set_rp(fido_cred_t *cred, const char *id, const char *name) +{ + fido_rp_t *rp = &cred->rp; + + if (rp->id != NULL) { + free(rp->id); + rp->id = NULL; + } + if (rp->name != NULL) { + free(rp->name); + rp->name = NULL; + } + + if (id != NULL && (rp->id = strdup(id)) == NULL) + goto fail; + if (name != NULL && (rp->name = strdup(name)) == NULL) + goto fail; + + return (FIDO_OK); +fail: + free(rp->id); + free(rp->name); + rp->id = NULL; + rp->name = NULL; + + return (FIDO_ERR_INTERNAL); +} + +int +fido_cred_set_user(fido_cred_t *cred, const unsigned char *user_id, + size_t user_id_len, const char *name, const char *display_name, + const char *icon) +{ + fido_user_t *up = &cred->user; + + if (up->id.ptr != NULL) { + free(up->id.ptr); + up->id.ptr = NULL; + up->id.len = 0; + } + if (up->name != NULL) { + free(up->name); + up->name = NULL; + } + if (up->display_name != NULL) { + free(up->display_name); + up->display_name = NULL; + } + if (up->icon != NULL) { + free(up->icon); + up->icon = NULL; + } + + if (user_id != NULL && fido_blob_set(&up->id, user_id, user_id_len) < 0) + goto fail; + if (name != NULL && (up->name = strdup(name)) == NULL) + goto fail; + if (display_name != NULL && + (up->display_name = strdup(display_name)) == NULL) + goto fail; + if (icon != NULL && (up->icon = strdup(icon)) == NULL) + goto fail; + + return (FIDO_OK); +fail: + free(up->id.ptr); + free(up->name); + free(up->display_name); + free(up->icon); + + up->id.ptr = NULL; + up->id.len = 0; + up->name = NULL; + up->display_name = NULL; + up->icon = NULL; + + return (FIDO_ERR_INTERNAL); +} + +int +fido_cred_set_extensions(fido_cred_t *cred, int ext) +{ + if (ext == 0) + cred->ext.mask = 0; + else { + if ((ext & FIDO_EXT_CRED_MASK) != ext) + return (FIDO_ERR_INVALID_ARGUMENT); + cred->ext.mask |= ext; + } + + return (FIDO_OK); +} + +int +fido_cred_set_options(fido_cred_t *cred, bool rk, bool uv) +{ + cred->rk = rk ? FIDO_OPT_TRUE : FIDO_OPT_FALSE; + cred->uv = uv ? FIDO_OPT_TRUE : FIDO_OPT_FALSE; + + return (FIDO_OK); +} + +int +fido_cred_set_rk(fido_cred_t *cred, fido_opt_t rk) +{ + cred->rk = rk; + + return (FIDO_OK); +} + +int +fido_cred_set_uv(fido_cred_t *cred, fido_opt_t uv) +{ + cred->uv = uv; + + return (FIDO_OK); +} + +int +fido_cred_set_prot(fido_cred_t *cred, int prot) +{ + if (prot == 0) { + cred->ext.mask &= ~FIDO_EXT_CRED_PROTECT; + cred->ext.prot = 0; + } else { + if (prot != FIDO_CRED_PROT_UV_OPTIONAL && + prot != FIDO_CRED_PROT_UV_OPTIONAL_WITH_ID && + prot != FIDO_CRED_PROT_UV_REQUIRED) + return (FIDO_ERR_INVALID_ARGUMENT); + + cred->ext.mask |= FIDO_EXT_CRED_PROTECT; + cred->ext.prot = prot; + } + + return (FIDO_OK); +} + +int +fido_cred_set_pin_minlen(fido_cred_t *cred, size_t len) +{ + if (len == 0) + cred->ext.mask &= ~FIDO_EXT_MINPINLEN; + else + cred->ext.mask |= FIDO_EXT_MINPINLEN; + + cred->ext.minpinlen = len; + + return (FIDO_OK); +} + +int +fido_cred_set_blob(fido_cred_t *cred, const unsigned char *ptr, size_t len) +{ + if (ptr == NULL || len == 0) + return (FIDO_ERR_INVALID_ARGUMENT); + if (fido_blob_set(&cred->blob, ptr, len) < 0) + return (FIDO_ERR_INTERNAL); + + cred->ext.mask |= FIDO_EXT_CRED_BLOB; + + return (FIDO_OK); +} + +int +fido_cred_set_fmt(fido_cred_t *cred, const char *fmt) +{ + free(cred->fmt); + cred->fmt = NULL; + + if (fmt == NULL) + return (FIDO_ERR_INVALID_ARGUMENT); + + if (strcmp(fmt, "packed") && strcmp(fmt, "fido-u2f") && + strcmp(fmt, "none") && strcmp(fmt, "tpm")) + return (FIDO_ERR_INVALID_ARGUMENT); + + if ((cred->fmt = strdup(fmt)) == NULL) + return (FIDO_ERR_INTERNAL); + + return (FIDO_OK); +} + +int +fido_cred_set_type(fido_cred_t *cred, int cose_alg) +{ + if (cred->type != 0) + return (FIDO_ERR_INVALID_ARGUMENT); + if (cose_alg != COSE_ES256 && cose_alg != COSE_ES384 && + cose_alg != COSE_RS256 && cose_alg != COSE_EDDSA) + return (FIDO_ERR_INVALID_ARGUMENT); + + cred->type = cose_alg; + + return (FIDO_OK); +} + +int +fido_cred_type(const fido_cred_t *cred) +{ + return (cred->type); +} + +uint8_t +fido_cred_flags(const fido_cred_t *cred) +{ + return (cred->authdata.flags); +} + +uint32_t +fido_cred_sigcount(const fido_cred_t *cred) +{ + return (cred->authdata.sigcount); +} + +const unsigned char * +fido_cred_clientdata_hash_ptr(const fido_cred_t *cred) +{ + return (cred->cdh.ptr); +} + +size_t +fido_cred_clientdata_hash_len(const fido_cred_t *cred) +{ + return (cred->cdh.len); +} + +const unsigned char * +fido_cred_x5c_ptr(const fido_cred_t *cred) +{ + return (cred->attstmt.x5c.ptr); +} + +size_t +fido_cred_x5c_len(const fido_cred_t *cred) +{ + return (cred->attstmt.x5c.len); +} + +const unsigned char * +fido_cred_sig_ptr(const fido_cred_t *cred) +{ + return (cred->attstmt.sig.ptr); +} + +size_t +fido_cred_sig_len(const fido_cred_t *cred) +{ + return (cred->attstmt.sig.len); +} + +const unsigned char * +fido_cred_authdata_ptr(const fido_cred_t *cred) +{ + return (cred->authdata_cbor.ptr); +} + +size_t +fido_cred_authdata_len(const fido_cred_t *cred) +{ + return (cred->authdata_cbor.len); +} + +const unsigned char * +fido_cred_authdata_raw_ptr(const fido_cred_t *cred) +{ + return (cred->authdata_raw.ptr); +} + +size_t +fido_cred_authdata_raw_len(const fido_cred_t *cred) +{ + return (cred->authdata_raw.len); +} + +const unsigned char * +fido_cred_attstmt_ptr(const fido_cred_t *cred) +{ + return (cred->attstmt.cbor.ptr); +} + +size_t +fido_cred_attstmt_len(const fido_cred_t *cred) +{ + return (cred->attstmt.cbor.len); +} + +const unsigned char * +fido_cred_pubkey_ptr(const fido_cred_t *cred) +{ + const void *ptr; + + switch (cred->attcred.type) { + case COSE_ES256: + ptr = &cred->attcred.pubkey.es256; + break; + case COSE_ES384: + ptr = &cred->attcred.pubkey.es384; + break; + case COSE_RS256: + ptr = &cred->attcred.pubkey.rs256; + break; + case COSE_EDDSA: + ptr = &cred->attcred.pubkey.eddsa; + break; + default: + ptr = NULL; + break; + } + + return (ptr); +} + +size_t +fido_cred_pubkey_len(const fido_cred_t *cred) +{ + size_t len; + + switch (cred->attcred.type) { + case COSE_ES256: + len = sizeof(cred->attcred.pubkey.es256); + break; + case COSE_ES384: + len = sizeof(cred->attcred.pubkey.es384); + break; + case COSE_RS256: + len = sizeof(cred->attcred.pubkey.rs256); + break; + case COSE_EDDSA: + len = sizeof(cred->attcred.pubkey.eddsa); + break; + default: + len = 0; + break; + } + + return (len); +} + +const unsigned char * +fido_cred_id_ptr(const fido_cred_t *cred) +{ + return (cred->attcred.id.ptr); +} + +size_t +fido_cred_id_len(const fido_cred_t *cred) +{ + return (cred->attcred.id.len); +} + +const unsigned char * +fido_cred_aaguid_ptr(const fido_cred_t *cred) +{ + return (cred->attcred.aaguid); +} + +size_t +fido_cred_aaguid_len(const fido_cred_t *cred) +{ + return (sizeof(cred->attcred.aaguid)); +} + +int +fido_cred_prot(const fido_cred_t *cred) +{ + return (cred->ext.prot); +} + +size_t +fido_cred_pin_minlen(const fido_cred_t *cred) +{ + return (cred->ext.minpinlen); +} + +const char * +fido_cred_fmt(const fido_cred_t *cred) +{ + return (cred->fmt); +} + +const char * +fido_cred_rp_id(const fido_cred_t *cred) +{ + return (cred->rp.id); +} + +const char * +fido_cred_rp_name(const fido_cred_t *cred) +{ + return (cred->rp.name); +} + +const char * +fido_cred_user_name(const fido_cred_t *cred) +{ + return (cred->user.name); +} + +const char * +fido_cred_display_name(const fido_cred_t *cred) +{ + return (cred->user.display_name); +} + +const unsigned char * +fido_cred_user_id_ptr(const fido_cred_t *cred) +{ + return (cred->user.id.ptr); +} + +size_t +fido_cred_user_id_len(const fido_cred_t *cred) +{ + return (cred->user.id.len); +} + +const unsigned char * +fido_cred_largeblob_key_ptr(const fido_cred_t *cred) +{ + return (cred->largeblob_key.ptr); +} + +size_t +fido_cred_largeblob_key_len(const fido_cred_t *cred) +{ + return (cred->largeblob_key.len); +} |