// SPDX-License-Identifier: GPL-2.0 #include <linux/ceph/ceph_debug.h> #include <linux/err.h>#include <linux/scatterlist.h>#include <linux/sched.h>#include <linux/slab.h>#include <crypto/aes.h>#include <crypto/krb5.h>#include <crypto/skcipher.h>#include <linux/key-type.h>#include <linux/sched/mm.h> #include <keys/ceph-type.h>#include <keys/user-type.h>#include <linux/ceph/decode.h>#include "crypto.h" static int set_aes_tfm(struct ceph_crypto_key *key){ unsigned int noio_flag; int ret; noio_flag = memalloc_noio_save(); key->aes_tfm = crypto_alloc_sync_skcipher("cbc(aes)", 0, 0); memalloc_noio_restore(noio_flag); if (IS_ERR(key->aes_tfm)) { ret = PTR_ERR(key->aes_tfm); key->aes_tfm = NULL; return ret; } ret = crypto_sync_skcipher_setkey(key->aes_tfm, key->key, key->len); if (ret) return ret; return 0;} static int set_krb5_tfms(struct ceph_crypto_key *key, const u32 *key_usages, int key_usage_cnt){ struct krb5_buffer TK = { .len = key->len, .data = key->key }; unsigned int noio_flag; int ret = 0; int i; if (WARN_ON_ONCE(key_usage_cnt > ARRAY_SIZE(key->krb5_tfms))) return -EINVAL; key->krb5_type = crypto_krb5_find_enctype( KRB5_ENCTYPE_AES256_CTS_HMAC_SHA384_192); if (!key->krb5_type) return -ENOPKG; /* * Despite crypto_krb5_prepare_encryption() taking a gfp mask, * crypto_alloc_aead() inside of it allocates with GFP_KERNEL. */ noio_flag = memalloc_noio_save(); for (i = 0; i < key_usage_cnt; i++) { key->krb5_tfms[i] = crypto_krb5_prepare_encryption( key->krb5_type, &TK, key_usages[i], GFP_NOIO); if (IS_ERR(key->krb5_tfms[i])) { ret = PTR_ERR(key->krb5_tfms[i]); key->krb5_tfms[i] = NULL; goto out_flag; } } out_flag: memalloc_noio_restore(noio_flag); return ret;} int ceph_crypto_key_prepare(struct ceph_crypto_key *key, const u32 *key_usages, int key_usage_cnt){ switch (key->type) { case CEPH_CRYPTO_NONE: return 0; /* nothing to do */ case CEPH_CRYPTO_AES: return set_aes_tfm(key); case CEPH_CRYPTO_AES256KRB5: hmac_sha256_preparekey(&key->hmac_key, key->key, key->len); return set_krb5_tfms(key, key_usages, key_usage_cnt); default: return -ENOTSUPP; }} /* * @dst should be zeroed before this function is called. */int ceph_crypto_key_clone(struct ceph_crypto_key *dst, const struct ceph_crypto_key *src){ dst->type = src->type; dst->created = src->created; dst->len = src->len; dst->key = kmemdup(src->key, src->len, GFP_NOIO); if (!dst->key) return -ENOMEM; return 0;} /* * @key should be zeroed before this function is called. */int ceph_crypto_key_decode(struct ceph_crypto_key *key, void **p, void *end){ ceph_decode_need(p, end, 2*sizeof(u16) + sizeof(key->created), bad); key->type = ceph_decode_16(p); ceph_decode_copy(p, &key->created, sizeof(key->created)); key->len = ceph_decode_16(p); ceph_decode_need(p, end, key->len, bad); if (key->len > CEPH_MAX_KEY_LEN) { pr_err("secret too big %d\n", key->len); return -EINVAL; } key->key = kmemdup(*p, key->len, GFP_NOIO); if (!key->key) return -ENOMEM; memzero_explicit(*p, key->len); *p += key->len; return 0; bad: dout("failed to decode crypto key\n"); return -EINVAL;} int ceph_crypto_key_unarmor(struct ceph_crypto_key *key, const char *inkey){ int inlen = strlen(inkey); int blen = inlen * 3 / 4; void *buf, *p; int ret; dout("crypto_key_unarmor %s\n", inkey); buf = kmalloc(blen, GFP_NOFS); if (!buf) return -ENOMEM; blen = ceph_unarmor(buf, inkey, inkey+inlen); if (blen < 0) { kfree(buf); return blen; } p = buf; ret = ceph_crypto_key_decode(key, &p, p + blen); kfree(buf); if (ret) return ret; dout("crypto_key_unarmor key %p type %d len %d\n", key, key->type, key->len); return 0;} void ceph_crypto_key_destroy(struct ceph_crypto_key *key){ int i; if (!key) return; kfree_sensitive(key->key); key->key = NULL; if (key->type == CEPH_CRYPTO_AES) { if (key->aes_tfm) { crypto_free_sync_skcipher(key->aes_tfm); key->aes_tfm = NULL; } } else if (key->type == CEPH_CRYPTO_AES256KRB5) { memzero_explicit(&key->hmac_key, sizeof(key->hmac_key)); for (i = 0; i < ARRAY_SIZE(key->krb5_tfms); i++) { if (key->krb5_tfms[i]) { crypto_free_aead(key->krb5_tfms[i]); key->krb5_tfms[i] = NULL; } } }} static const u8 *aes_iv = (u8 *)CEPH_AES_IV; /* * Should be used for buffers allocated with kvmalloc(). * Currently these are encrypt out-buffer (ceph_buffer) and decrypt * in-buffer (msg front). * * Dispose of @sgt with teardown_sgtable(). * * @prealloc_sg is to avoid memory allocation inside sg_alloc_table() * in cases where a single sg is sufficient. No attempt to reduce the * number of sgs by squeezing physically contiguous pages together is * made though, for simplicity. */static int setup_sgtable(struct sg_table *sgt, struct scatterlist *prealloc_sg, const void *buf, unsigned int buf_len){ struct scatterlist *sg; const bool is_vmalloc = is_vmalloc_addr(buf); unsigned int off = offset_in_page(buf); unsigned int chunk_cnt = 1; unsigned int chunk_len = PAGE_ALIGN(off + buf_len); int i; int ret; if (buf_len == 0) { memset(sgt, 0, sizeof(*sgt)); return -EINVAL; } if (is_vmalloc) { chunk_cnt = chunk_len >> PAGE_SHIFT; chunk_len = PAGE_SIZE; } if (chunk_cnt > 1) { ret = sg_alloc_table(sgt, chunk_cnt, GFP_NOFS); if (ret) return ret; } else { WARN_ON(chunk_cnt != 1); sg_init_table(prealloc_sg, 1); sgt->sgl = prealloc_sg; sgt->nents = sgt->orig_nents = 1; } for_each_sg(sgt->sgl, sg, sgt->orig_nents, i) { struct page *page; unsigned int len = min(chunk_len - off, buf_len); if (is_vmalloc) page = vmalloc_to_page(buf); else page = virt_to_page(buf); sg_set_page(sg, page, len, off); off = 0; buf += len; buf_len -= len; } WARN_ON(buf_len != 0); return 0;} static void teardown_sgtable(struct sg_table *sgt){ if (sgt->orig_nents > 1) sg_free_table(sgt);} static int ceph_aes_crypt(const struct ceph_crypto_key *key, bool encrypt, void *buf, int buf_len, int in_len, int *pout_len){ SYNC_SKCIPHER_REQUEST_ON_STACK(req, key->aes_tfm); struct sg_table sgt; struct scatterlist prealloc_sg; char iv[AES_BLOCK_SIZE] __aligned(8); int pad_byte = AES_BLOCK_SIZE - (in_len & (AES_BLOCK_SIZE - 1)); int crypt_len = encrypt ? in_len + pad_byte : in_len; int ret; WARN_ON(crypt_len > buf_len); if (encrypt) memset(buf + in_len, pad_byte, pad_byte); ret = setup_sgtable(&sgt, &prealloc_sg, buf, crypt_len); if (ret) return ret; memcpy(iv, aes_iv, AES_BLOCK_SIZE); skcipher_request_set_sync_tfm(req, key->aes_tfm); skcipher_request_set_callback(req, 0, NULL, NULL); skcipher_request_set_crypt(req, sgt.sgl, sgt.sgl, crypt_len, iv); /* print_hex_dump(KERN_ERR, "key: ", DUMP_PREFIX_NONE, 16, 1, key->key, key->len, 1); print_hex_dump(KERN_ERR, " in: ", DUMP_PREFIX_NONE, 16, 1, buf, crypt_len, 1); */ if (encrypt) ret = crypto_skcipher_encrypt(req); else ret = crypto_skcipher_decrypt(req); skcipher_request_zero(req); if (ret) { pr_err("%s %scrypt failed: %d\n", __func__, encrypt ? "en" : "de", ret); goto out_sgt; } /* print_hex_dump(KERN_ERR, "out: ", DUMP_PREFIX_NONE, 16, 1, buf, crypt_len, 1); */ if (encrypt) { *pout_len = crypt_len; } else { pad_byte = *(char *)(buf + in_len - 1); if (pad_byte > 0 && pad_byte <= AES_BLOCK_SIZE && in_len >= pad_byte) { *pout_len = in_len - pad_byte; } else { pr_err("%s got bad padding %d on in_len %d\n", __func__, pad_byte, in_len); ret = -EPERM; goto out_sgt; } } out_sgt: teardown_sgtable(&sgt); return ret;} static int ceph_krb5_encrypt(const struct ceph_crypto_key *key, int usage_slot, void *buf, int buf_len, int in_len, int *pout_len){ struct sg_table sgt; struct scatterlist prealloc_sg; int ret; if (WARN_ON_ONCE(usage_slot >= ARRAY_SIZE(key->krb5_tfms))) return -EINVAL; ret = setup_sgtable(&sgt, &prealloc_sg, buf, buf_len); if (ret) return ret; ret = crypto_krb5_encrypt(key->krb5_type, key->krb5_tfms[usage_slot], sgt.sgl, sgt.nents, buf_len, AES_BLOCK_SIZE, in_len, false); if (ret < 0) { pr_err("%s encrypt failed: %d\n", __func__, ret); goto out_sgt; } *pout_len = ret; ret = 0; out_sgt: teardown_sgtable(&sgt); return ret;} static int ceph_krb5_decrypt(const struct ceph_crypto_key *key, int usage_slot, void *buf, int buf_len, int in_len, int *pout_len){ struct sg_table sgt; struct scatterlist prealloc_sg; size_t data_off = 0; size_t data_len = in_len; int ret; if (WARN_ON_ONCE(usage_slot >= ARRAY_SIZE(key->krb5_tfms))) return -EINVAL; ret = setup_sgtable(&sgt, &prealloc_sg, buf, in_len); if (ret) return ret; ret = crypto_krb5_decrypt(key->krb5_type, key->krb5_tfms[usage_slot], sgt.sgl, sgt.nents, &data_off, &data_len); if (ret) { pr_err("%s decrypt failed: %d\n", __func__, ret); goto out_sgt; } WARN_ON(data_off != AES_BLOCK_SIZE); *pout_len = data_len; out_sgt: teardown_sgtable(&sgt); return ret;} int ceph_crypt(const struct ceph_crypto_key *key, int usage_slot, bool encrypt, void *buf, int buf_len, int in_len, int *pout_len){ switch (key->type) { case CEPH_CRYPTO_NONE: *pout_len = in_len; return 0; case CEPH_CRYPTO_AES: return ceph_aes_crypt(key, encrypt, buf, buf_len, in_len, pout_len); case CEPH_CRYPTO_AES256KRB5: return encrypt ? ceph_krb5_encrypt(key, usage_slot, buf, buf_len, in_len, pout_len) : ceph_krb5_decrypt(key, usage_slot, buf, buf_len, in_len, pout_len); default: return -ENOTSUPP; }} int ceph_crypt_data_offset(const struct ceph_crypto_key *key){ switch (key->type) { case CEPH_CRYPTO_NONE: case CEPH_CRYPTO_AES: return 0; case CEPH_CRYPTO_AES256KRB5: /* confounder */ return AES_BLOCK_SIZE; default: BUG(); }} int ceph_crypt_buflen(const struct ceph_crypto_key *key, int data_len){ switch (key->type) { case CEPH_CRYPTO_NONE: return data_len; case CEPH_CRYPTO_AES: /* PKCS#7 padding at the end */ return data_len + AES_BLOCK_SIZE - (data_len & (AES_BLOCK_SIZE - 1)); case CEPH_CRYPTO_AES256KRB5: /* confounder at the beginning and 192-bit HMAC at the end */ return AES_BLOCK_SIZE + data_len + 24; default: BUG(); }} void ceph_hmac_sha256(const struct ceph_crypto_key *key, const void *buf, int buf_len, u8 hmac[SHA256_DIGEST_SIZE]){ switch (key->type) { case CEPH_CRYPTO_NONE: case CEPH_CRYPTO_AES: memset(hmac, 0, SHA256_DIGEST_SIZE); return; case CEPH_CRYPTO_AES256KRB5: hmac_sha256(&key->hmac_key, buf, buf_len, hmac); return; default: BUG(); }} static int ceph_key_preparse(struct key_preparsed_payload *prep){ struct ceph_crypto_key *ckey; size_t datalen = prep->datalen; int ret; void *p; ret = -EINVAL; if (datalen <= 0 || datalen > 32767 || !prep->data) goto err; ret = -ENOMEM; ckey = kzalloc_obj(*ckey); if (!ckey) goto err; /* TODO ceph_crypto_key_decode should really take const input */ p = (void *)prep->data; ret = ceph_crypto_key_decode(ckey, &p, (char*)prep->data+datalen); if (ret < 0) goto err_ckey; prep->payload.data[0] = ckey; prep->quotalen = datalen; return 0; err_ckey: kfree(ckey);err: return ret;} static void ceph_key_free_preparse(struct key_preparsed_payload *prep){ struct ceph_crypto_key *ckey = prep->payload.data[0]; ceph_crypto_key_destroy(ckey); kfree(ckey);} static void ceph_key_destroy(struct key *key){ struct ceph_crypto_key *ckey = key->payload.data[0]; ceph_crypto_key_destroy(ckey);Lines 1–500 of 520. 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// SPDX-License-Identifier: GPL-2.0 #include <linux/ceph/ceph_debug.h> #include <linux/err.h> #include <linux/scatterlist.h> #include <linux/sched.h> #include <linux/slab.h> #include <crypto/aes.h> #include <crypto/krb5.h> #include <crypto/skcipher.h> #include <linux/key-type.h> #include <linux/sched/mm.h> #include <keys/ceph-type.h> #include <keys/user-type.h> #include <linux/ceph/decode.h> #include "crypto.h" static int set_aes_tfm(struct ceph_crypto_key *key) { unsigned int noio_flag; int ret; noio_flag = memalloc_noio_save(); key->aes_tfm = crypto_alloc_sync_skcipher("cbc(aes)", 0, 0); memalloc_noio_restore(noio_flag); if (IS_ERR(key->aes_tfm)) { ret = PTR_ERR(key->aes_tfm); key->aes_tfm = NULL; return ret; } ret = crypto_sync_skcipher_setkey(key->aes_tfm, key->key, key->len); if (ret) return ret; return 0; } static int set_krb5_tfms(struct ceph_crypto_key *key, const u32 *key_usages, int key_usage_cnt) { struct krb5_buffer TK = { .len = key->len, .data = key->key }; unsigned int noio_flag; int ret = 0; int i; if (WARN_ON_ONCE(key_usage_cnt > ARRAY_SIZE(key->krb5_tfms))) return -EINVAL; key->krb5_type = crypto_krb5_find_enctype( KRB5_ENCTYPE_AES256_CTS_HMAC_SHA384_192); if (!key->krb5_type) return -ENOPKG; /* * Despite crypto_krb5_prepare_encryption() taking a gfp mask, * crypto_alloc_aead() inside of it allocates with GFP_KERNEL. */ noio_flag = memalloc_noio_save(); for (i = 0; i < key_usage_cnt; i++) { key->krb5_tfms[i] = crypto_krb5_prepare_encryption( key->krb5_type, &TK, key_usages[i], GFP_NOIO); if (IS_ERR(key->krb5_tfms[i])) { ret = PTR_ERR(key->krb5_tfms[i]); key->krb5_tfms[i] = NULL; goto out_flag; } } out_flag: memalloc_noio_restore(noio_flag); return ret; } int ceph_crypto_key_prepare(struct ceph_crypto_key *key, const u32 *key_usages, int key_usage_cnt) { switch (key->type) { case CEPH_CRYPTO_NONE: return 0; /* nothing to do */ case CEPH_CRYPTO_AES: return set_aes_tfm(key); case CEPH_CRYPTO_AES256KRB5: hmac_sha256_preparekey(&key->hmac_key, key->key, key->len); return set_krb5_tfms(key, key_usages, key_usage_cnt); default: return -ENOTSUPP; } } /* * @dst should be zeroed before this function is called. */ int ceph_crypto_key_clone(struct ceph_crypto_key *dst, const struct ceph_crypto_key *src) { dst->type = src->type; dst->created = src->created; dst->len = src->len; dst->key = kmemdup(src->key, src->len, GFP_NOIO); if (!dst->key) return -ENOMEM; return 0; } /* * @key should be zeroed before this function is called. */ int ceph_crypto_key_decode(struct ceph_crypto_key *key, void **p, void *end) { ceph_decode_need(p, end, 2*sizeof(u16) + sizeof(key->created), bad); key->type = ceph_decode_16(p); ceph_decode_copy(p, &key->created, sizeof(key->created)); key->len = ceph_decode_16(p); ceph_decode_need(p, end, key->len, bad); if (key->len > CEPH_MAX_KEY_LEN) { pr_err("secret too big %d\n", key->len); return -EINVAL; } key->key = kmemdup(*p, key->len, GFP_NOIO); if (!key->key) return -ENOMEM; memzero_explicit(*p, key->len); *p += key->len; return 0; bad: dout("failed to decode crypto key\n"); return -EINVAL; } int ceph_crypto_key_unarmor(struct ceph_crypto_key *key, const char *inkey) { int inlen = strlen(inkey); int blen = inlen * 3 / 4; void *buf, *p; int ret; dout("crypto_key_unarmor %s\n", inkey); buf = kmalloc(blen, GFP_NOFS); if (!buf) return -ENOMEM; blen = ceph_unarmor(buf, inkey, inkey+inlen); if (blen < 0) { kfree(buf); return blen; } p = buf; ret = ceph_crypto_key_decode(key, &p, p + blen); kfree(buf); if (ret) return ret; dout("crypto_key_unarmor key %p type %d len %d\n", key, key->type, key->len); return 0; } void ceph_crypto_key_destroy(struct ceph_crypto_key *key) { int i; if (!key) return; kfree_sensitive(key->key); key->key = NULL; if (key->type == CEPH_CRYPTO_AES) { if (key->aes_tfm) { crypto_free_sync_skcipher(key->aes_tfm); key->aes_tfm = NULL; } } else if (key->type == CEPH_CRYPTO_AES256KRB5) { memzero_explicit(&key->hmac_key, sizeof(key->hmac_key)); for (i = 0; i < ARRAY_SIZE(key->krb5_tfms); i++) { if (key->krb5_tfms[i]) { crypto_free_aead(key->krb5_tfms[i]); key->krb5_tfms[i] = NULL; } } } } static const u8 *aes_iv = (u8 *)CEPH_AES_IV; /* * Should be used for buffers allocated with kvmalloc(). * Currently these are encrypt out-buffer (ceph_buffer) and decrypt * in-buffer (msg front). * * Dispose of @sgt with teardown_sgtable(). * * @prealloc_sg is to avoid memory allocation inside sg_alloc_table() * in cases where a single sg is sufficient. No attempt to reduce the * number of sgs by squeezing physically contiguous pages together is * made though, for simplicity. */ static int setup_sgtable(struct sg_table *sgt, struct scatterlist *prealloc_sg, const void *buf, unsigned int buf_len) { struct scatterlist *sg; const bool is_vmalloc = is_vmalloc_addr(buf); unsigned int off = offset_in_page(buf); unsigned int chunk_cnt = 1; unsigned int chunk_len = PAGE_ALIGN(off + buf_len); int i; int ret; if (buf_len == 0) { memset(sgt, 0, sizeof(*sgt)); return -EINVAL; } if (is_vmalloc) { chunk_cnt = chunk_len >> PAGE_SHIFT; chunk_len = PAGE_SIZE; } if (chunk_cnt > 1) { ret = sg_alloc_table(sgt, chunk_cnt, GFP_NOFS); if (ret) return ret; } else { WARN_ON(chunk_cnt != 1); sg_init_table(prealloc_sg, 1); sgt->sgl = prealloc_sg; sgt->nents = sgt->orig_nents = 1; } for_each_sg(sgt->sgl, sg, sgt->orig_nents, i) { struct page *page; unsigned int len = min(chunk_len - off, buf_len); if (is_vmalloc) page = vmalloc_to_page(buf); else page = virt_to_page(buf); sg_set_page(sg, page, len, off); off = 0; buf += len; buf_len -= len; } WARN_ON(buf_len != 0); return 0; } static void teardown_sgtable(struct sg_table *sgt) { if (sgt->orig_nents > 1) sg_free_table(sgt); } static int ceph_aes_crypt(const struct ceph_crypto_key *key, bool encrypt, void *buf, int buf_len, int in_len, int *pout_len) { SYNC_SKCIPHER_REQUEST_ON_STACK(req, key->aes_tfm); struct sg_table sgt; struct scatterlist prealloc_sg; char iv[AES_BLOCK_SIZE] __aligned(8); int pad_byte = AES_BLOCK_SIZE - (in_len & (AES_BLOCK_SIZE - 1)); int crypt_len = encrypt ? in_len + pad_byte : in_len; int ret; WARN_ON(crypt_len > buf_len); if (encrypt) memset(buf + in_len, pad_byte, pad_byte); ret = setup_sgtable(&sgt, &prealloc_sg, buf, crypt_len); if (ret) return ret; memcpy(iv, aes_iv, AES_BLOCK_SIZE); skcipher_request_set_sync_tfm(req, key->aes_tfm); skcipher_request_set_callback(req, 0, NULL, NULL); skcipher_request_set_crypt(req, sgt.sgl, sgt.sgl, crypt_len, iv); /* print_hex_dump(KERN_ERR, "key: ", DUMP_PREFIX_NONE, 16, 1, key->key, key->len, 1); print_hex_dump(KERN_ERR, " in: ", DUMP_PREFIX_NONE, 16, 1, buf, crypt_len, 1); */ if (encrypt) ret = crypto_skcipher_encrypt(req); else ret = crypto_skcipher_decrypt(req); skcipher_request_zero(req); if (ret) { pr_err("%s %scrypt failed: %d\n", __func__, encrypt ? "en" : "de", ret); goto out_sgt; } /* print_hex_dump(KERN_ERR, "out: ", DUMP_PREFIX_NONE, 16, 1, buf, crypt_len, 1); */ if (encrypt) { *pout_len = crypt_len; } else { pad_byte = *(char *)(buf + in_len - 1); if (pad_byte > 0 && pad_byte <= AES_BLOCK_SIZE && in_len >= pad_byte) { *pout_len = in_len - pad_byte; } else { pr_err("%s got bad padding %d on in_len %d\n", __func__, pad_byte, in_len); ret = -EPERM; goto out_sgt; } } out_sgt: teardown_sgtable(&sgt); return ret; } static int ceph_krb5_encrypt(const struct ceph_crypto_key *key, int usage_slot, void *buf, int buf_len, int in_len, int *pout_len) { struct sg_table sgt; struct scatterlist prealloc_sg; int ret; if (WARN_ON_ONCE(usage_slot >= ARRAY_SIZE(key->krb5_tfms))) return -EINVAL; ret = setup_sgtable(&sgt, &prealloc_sg, buf, buf_len); if (ret) return ret; ret = crypto_krb5_encrypt(key->krb5_type, key->krb5_tfms[usage_slot], sgt.sgl, sgt.nents, buf_len, AES_BLOCK_SIZE, in_len, false); if (ret < 0) { pr_err("%s encrypt failed: %d\n", __func__, ret); goto out_sgt; } *pout_len = ret; ret = 0; out_sgt: teardown_sgtable(&sgt); return ret; } static int ceph_krb5_decrypt(const struct ceph_crypto_key *key, int usage_slot, void *buf, int buf_len, int in_len, int *pout_len) { struct sg_table sgt; struct scatterlist prealloc_sg; size_t data_off = 0; size_t data_len = in_len; int ret; if (WARN_ON_ONCE(usage_slot >= ARRAY_SIZE(key->krb5_tfms))) return -EINVAL; ret = setup_sgtable(&sgt, &prealloc_sg, buf, in_len); if (ret) return ret; ret = crypto_krb5_decrypt(key->krb5_type, key->krb5_tfms[usage_slot], sgt.sgl, sgt.nents, &data_off, &data_len); if (ret) { pr_err("%s decrypt failed: %d\n", __func__, ret); goto out_sgt; } WARN_ON(data_off != AES_BLOCK_SIZE); *pout_len = data_len; out_sgt: teardown_sgtable(&sgt); return ret; } int ceph_crypt(const struct ceph_crypto_key *key, int usage_slot, bool encrypt, void *buf, int buf_len, int in_len, int *pout_len) { switch (key->type) { case CEPH_CRYPTO_NONE: *pout_len = in_len; return 0; case CEPH_CRYPTO_AES: return ceph_aes_crypt(key, encrypt, buf, buf_len, in_len, pout_len); case CEPH_CRYPTO_AES256KRB5: return encrypt ? ceph_krb5_encrypt(key, usage_slot, buf, buf_len, in_len, pout_len) : ceph_krb5_decrypt(key, usage_slot, buf, buf_len, in_len, pout_len); default: return -ENOTSUPP; } } int ceph_crypt_data_offset(const struct ceph_crypto_key *key) { switch (key->type) { case CEPH_CRYPTO_NONE: case CEPH_CRYPTO_AES: return 0; case CEPH_CRYPTO_AES256KRB5: /* confounder */ return AES_BLOCK_SIZE; default: BUG(); } } int ceph_crypt_buflen(const struct ceph_crypto_key *key, int data_len) { switch (key->type) { case CEPH_CRYPTO_NONE: return data_len; case CEPH_CRYPTO_AES: /* PKCS#7 padding at the end */ return data_len + AES_BLOCK_SIZE - (data_len & (AES_BLOCK_SIZE - 1)); case CEPH_CRYPTO_AES256KRB5: /* confounder at the beginning and 192-bit HMAC at the end */ return AES_BLOCK_SIZE + data_len + 24; default: BUG(); } } void ceph_hmac_sha256(const struct ceph_crypto_key *key, const void *buf, int buf_len, u8 hmac[SHA256_DIGEST_SIZE]) { switch (key->type) { case CEPH_CRYPTO_NONE: case CEPH_CRYPTO_AES: memset(hmac, 0, SHA256_DIGEST_SIZE); return; case CEPH_CRYPTO_AES256KRB5: hmac_sha256(&key->hmac_key, buf, buf_len, hmac); return; default: BUG(); } } static int ceph_key_preparse(struct key_preparsed_payload *prep) { struct ceph_crypto_key *ckey; size_t datalen = prep->datalen; int ret; void *p; ret = -EINVAL; if (datalen <= 0 || datalen > 32767 || !prep->data) goto err; ret = -ENOMEM; ckey = kzalloc_obj(*ckey); if (!ckey) goto err; /* TODO ceph_crypto_key_decode should really take const input */ p = (void *)prep->data; ret = ceph_crypto_key_decode(ckey, &p, (char*)prep->data+datalen); if (ret < 0) goto err_ckey; prep->payload.data[0] = ckey; prep->quotalen = datalen; return 0; err_ckey: kfree(ckey); err: return ret; } static void ceph_key_free_preparse(struct key_preparsed_payload *prep) { struct ceph_crypto_key *ckey = prep->payload.data[0]; ceph_crypto_key_destroy(ckey); kfree(ckey); } static void ceph_key_destroy(struct key *key) { struct ceph_crypto_key *ckey = key->payload.data[0]; ceph_crypto_key_destroy(ckey);