diff options
Diffstat (limited to 'net/ceph/auth_x.c')
| -rw-r--r-- | net/ceph/auth_x.c | 1122 |
1 files changed, 1122 insertions, 0 deletions
diff --git a/net/ceph/auth_x.c b/net/ceph/auth_x.c new file mode 100644 index 000000000..b71b16359 --- /dev/null +++ b/net/ceph/auth_x.c @@ -0,0 +1,1122 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/ceph/ceph_debug.h> + +#include <linux/err.h> +#include <linux/module.h> +#include <linux/random.h> +#include <linux/slab.h> + +#include <linux/ceph/decode.h> +#include <linux/ceph/auth.h> +#include <linux/ceph/ceph_features.h> +#include <linux/ceph/libceph.h> +#include <linux/ceph/messenger.h> + +#include "crypto.h" +#include "auth_x.h" +#include "auth_x_protocol.h" + +static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed); + +static int ceph_x_is_authenticated(struct ceph_auth_client *ac) +{ + struct ceph_x_info *xi = ac->private; + int missing; + int need; /* missing + need renewal */ + + ceph_x_validate_tickets(ac, &need); + missing = ac->want_keys & ~xi->have_keys; + WARN_ON((need & missing) != missing); + dout("%s want 0x%x have 0x%x missing 0x%x -> %d\n", __func__, + ac->want_keys, xi->have_keys, missing, !missing); + return !missing; +} + +static int ceph_x_should_authenticate(struct ceph_auth_client *ac) +{ + struct ceph_x_info *xi = ac->private; + int need; + + ceph_x_validate_tickets(ac, &need); + dout("%s want 0x%x have 0x%x need 0x%x -> %d\n", __func__, + ac->want_keys, xi->have_keys, need, !!need); + return !!need; +} + +static int ceph_x_encrypt_offset(void) +{ + return sizeof(u32) + sizeof(struct ceph_x_encrypt_header); +} + +static int ceph_x_encrypt_buflen(int ilen) +{ + return ceph_x_encrypt_offset() + ilen + 16; +} + +static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf, + int buf_len, int plaintext_len) +{ + struct ceph_x_encrypt_header *hdr = buf + sizeof(u32); + int ciphertext_len; + int ret; + + hdr->struct_v = 1; + hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC); + + ret = ceph_crypt(secret, true, buf + sizeof(u32), buf_len - sizeof(u32), + plaintext_len + sizeof(struct ceph_x_encrypt_header), + &ciphertext_len); + if (ret) + return ret; + + ceph_encode_32(&buf, ciphertext_len); + return sizeof(u32) + ciphertext_len; +} + +static int __ceph_x_decrypt(struct ceph_crypto_key *secret, void *p, + int ciphertext_len) +{ + struct ceph_x_encrypt_header *hdr = p; + int plaintext_len; + int ret; + + ret = ceph_crypt(secret, false, p, ciphertext_len, ciphertext_len, + &plaintext_len); + if (ret) + return ret; + + if (le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC) { + pr_err("%s bad magic\n", __func__); + return -EINVAL; + } + + return plaintext_len - sizeof(*hdr); +} + +static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end) +{ + int ciphertext_len; + int ret; + + ceph_decode_32_safe(p, end, ciphertext_len, e_inval); + ceph_decode_need(p, end, ciphertext_len, e_inval); + + ret = __ceph_x_decrypt(secret, *p, ciphertext_len); + if (ret < 0) + return ret; + + *p += ciphertext_len; + return ret; + +e_inval: + return -EINVAL; +} + +/* + * get existing (or insert new) ticket handler + */ +static struct ceph_x_ticket_handler * +get_ticket_handler(struct ceph_auth_client *ac, int service) +{ + struct ceph_x_ticket_handler *th; + struct ceph_x_info *xi = ac->private; + struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node; + + while (*p) { + parent = *p; + th = rb_entry(parent, struct ceph_x_ticket_handler, node); + if (service < th->service) + p = &(*p)->rb_left; + else if (service > th->service) + p = &(*p)->rb_right; + else + return th; + } + + /* add it */ + th = kzalloc(sizeof(*th), GFP_NOFS); + if (!th) + return ERR_PTR(-ENOMEM); + th->service = service; + rb_link_node(&th->node, parent, p); + rb_insert_color(&th->node, &xi->ticket_handlers); + return th; +} + +static void remove_ticket_handler(struct ceph_auth_client *ac, + struct ceph_x_ticket_handler *th) +{ + struct ceph_x_info *xi = ac->private; + + dout("remove_ticket_handler %p %d\n", th, th->service); + rb_erase(&th->node, &xi->ticket_handlers); + ceph_crypto_key_destroy(&th->session_key); + if (th->ticket_blob) + ceph_buffer_put(th->ticket_blob); + kfree(th); +} + +static int process_one_ticket(struct ceph_auth_client *ac, + struct ceph_crypto_key *secret, + void **p, void *end) +{ + struct ceph_x_info *xi = ac->private; + int type; + u8 tkt_struct_v, blob_struct_v; + struct ceph_x_ticket_handler *th; + void *dp, *dend; + int dlen; + char is_enc; + struct timespec64 validity; + void *tp, *tpend; + void **ptp; + struct ceph_crypto_key new_session_key = { 0 }; + struct ceph_buffer *new_ticket_blob; + time64_t new_expires, new_renew_after; + u64 new_secret_id; + int ret; + + ceph_decode_need(p, end, sizeof(u32) + 1, bad); + + type = ceph_decode_32(p); + dout(" ticket type %d %s\n", type, ceph_entity_type_name(type)); + + tkt_struct_v = ceph_decode_8(p); + if (tkt_struct_v != 1) + goto bad; + + th = get_ticket_handler(ac, type); + if (IS_ERR(th)) { + ret = PTR_ERR(th); + goto out; + } + + /* blob for me */ + dp = *p + ceph_x_encrypt_offset(); + ret = ceph_x_decrypt(secret, p, end); + if (ret < 0) + goto out; + dout(" decrypted %d bytes\n", ret); + dend = dp + ret; + + ceph_decode_8_safe(&dp, dend, tkt_struct_v, bad); + if (tkt_struct_v != 1) + goto bad; + + ret = ceph_crypto_key_decode(&new_session_key, &dp, dend); + if (ret) + goto out; + + ceph_decode_need(&dp, dend, sizeof(struct ceph_timespec), bad); + ceph_decode_timespec64(&validity, dp); + dp += sizeof(struct ceph_timespec); + new_expires = ktime_get_real_seconds() + validity.tv_sec; + new_renew_after = new_expires - (validity.tv_sec / 4); + dout(" expires=%llu renew_after=%llu\n", new_expires, + new_renew_after); + + /* ticket blob for service */ + ceph_decode_8_safe(p, end, is_enc, bad); + if (is_enc) { + /* encrypted */ + tp = *p + ceph_x_encrypt_offset(); + ret = ceph_x_decrypt(&th->session_key, p, end); + if (ret < 0) + goto out; + dout(" encrypted ticket, decrypted %d bytes\n", ret); + ptp = &tp; + tpend = tp + ret; + } else { + /* unencrypted */ + ptp = p; + tpend = end; + } + ceph_decode_32_safe(ptp, tpend, dlen, bad); + dout(" ticket blob is %d bytes\n", dlen); + ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad); + blob_struct_v = ceph_decode_8(ptp); + if (blob_struct_v != 1) + goto bad; + + new_secret_id = ceph_decode_64(ptp); + ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend); + if (ret) + goto out; + + /* all is well, update our ticket */ + ceph_crypto_key_destroy(&th->session_key); + if (th->ticket_blob) + ceph_buffer_put(th->ticket_blob); + th->session_key = new_session_key; + th->ticket_blob = new_ticket_blob; + th->secret_id = new_secret_id; + th->expires = new_expires; + th->renew_after = new_renew_after; + th->have_key = true; + dout(" got ticket service %d (%s) secret_id %lld len %d\n", + type, ceph_entity_type_name(type), th->secret_id, + (int)th->ticket_blob->vec.iov_len); + xi->have_keys |= th->service; + return 0; + +bad: + ret = -EINVAL; +out: + ceph_crypto_key_destroy(&new_session_key); + return ret; +} + +static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac, + struct ceph_crypto_key *secret, + void **p, void *end) +{ + u8 reply_struct_v; + u32 num; + int ret; + + ceph_decode_8_safe(p, end, reply_struct_v, bad); + if (reply_struct_v != 1) + return -EINVAL; + + ceph_decode_32_safe(p, end, num, bad); + dout("%d tickets\n", num); + + while (num--) { + ret = process_one_ticket(ac, secret, p, end); + if (ret) + return ret; + } + + return 0; + +bad: + return -EINVAL; +} + +/* + * Encode and encrypt the second part (ceph_x_authorize_b) of the + * authorizer. The first part (ceph_x_authorize_a) should already be + * encoded. + */ +static int encrypt_authorizer(struct ceph_x_authorizer *au, + u64 *server_challenge) +{ + struct ceph_x_authorize_a *msg_a; + struct ceph_x_authorize_b *msg_b; + void *p, *end; + int ret; + + msg_a = au->buf->vec.iov_base; + WARN_ON(msg_a->ticket_blob.secret_id != cpu_to_le64(au->secret_id)); + p = (void *)(msg_a + 1) + le32_to_cpu(msg_a->ticket_blob.blob_len); + end = au->buf->vec.iov_base + au->buf->vec.iov_len; + + msg_b = p + ceph_x_encrypt_offset(); + msg_b->struct_v = 2; + msg_b->nonce = cpu_to_le64(au->nonce); + if (server_challenge) { + msg_b->have_challenge = 1; + msg_b->server_challenge_plus_one = + cpu_to_le64(*server_challenge + 1); + } else { + msg_b->have_challenge = 0; + msg_b->server_challenge_plus_one = 0; + } + + ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b)); + if (ret < 0) + return ret; + + p += ret; + if (server_challenge) { + WARN_ON(p != end); + } else { + WARN_ON(p > end); + au->buf->vec.iov_len = p - au->buf->vec.iov_base; + } + + return 0; +} + +static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au) +{ + ceph_crypto_key_destroy(&au->session_key); + if (au->buf) { + ceph_buffer_put(au->buf); + au->buf = NULL; + } +} + +static int ceph_x_build_authorizer(struct ceph_auth_client *ac, + struct ceph_x_ticket_handler *th, + struct ceph_x_authorizer *au) +{ + int maxlen; + struct ceph_x_authorize_a *msg_a; + struct ceph_x_authorize_b *msg_b; + int ret; + int ticket_blob_len = + (th->ticket_blob ? th->ticket_blob->vec.iov_len : 0); + + dout("build_authorizer for %s %p\n", + ceph_entity_type_name(th->service), au); + + ceph_crypto_key_destroy(&au->session_key); + ret = ceph_crypto_key_clone(&au->session_key, &th->session_key); + if (ret) + goto out_au; + + maxlen = sizeof(*msg_a) + ticket_blob_len + + ceph_x_encrypt_buflen(sizeof(*msg_b)); + dout(" need len %d\n", maxlen); + if (au->buf && au->buf->alloc_len < maxlen) { + ceph_buffer_put(au->buf); + au->buf = NULL; + } + if (!au->buf) { + au->buf = ceph_buffer_new(maxlen, GFP_NOFS); + if (!au->buf) { + ret = -ENOMEM; + goto out_au; + } + } + au->service = th->service; + WARN_ON(!th->secret_id); + au->secret_id = th->secret_id; + + msg_a = au->buf->vec.iov_base; + msg_a->struct_v = 1; + msg_a->global_id = cpu_to_le64(ac->global_id); + msg_a->service_id = cpu_to_le32(th->service); + msg_a->ticket_blob.struct_v = 1; + msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id); + msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len); + if (ticket_blob_len) { + memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base, + th->ticket_blob->vec.iov_len); + } + dout(" th %p secret_id %lld %lld\n", th, th->secret_id, + le64_to_cpu(msg_a->ticket_blob.secret_id)); + + get_random_bytes(&au->nonce, sizeof(au->nonce)); + ret = encrypt_authorizer(au, NULL); + if (ret) { + pr_err("failed to encrypt authorizer: %d", ret); + goto out_au; + } + + dout(" built authorizer nonce %llx len %d\n", au->nonce, + (int)au->buf->vec.iov_len); + return 0; + +out_au: + ceph_x_authorizer_cleanup(au); + return ret; +} + +static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th, + void **p, void *end) +{ + ceph_decode_need(p, end, 1 + sizeof(u64), bad); + ceph_encode_8(p, 1); + ceph_encode_64(p, th->secret_id); + if (th->ticket_blob) { + const char *buf = th->ticket_blob->vec.iov_base; + u32 len = th->ticket_blob->vec.iov_len; + + ceph_encode_32_safe(p, end, len, bad); + ceph_encode_copy_safe(p, end, buf, len, bad); + } else { + ceph_encode_32_safe(p, end, 0, bad); + } + + return 0; +bad: + return -ERANGE; +} + +static bool need_key(struct ceph_x_ticket_handler *th) +{ + if (!th->have_key) + return true; + + return ktime_get_real_seconds() >= th->renew_after; +} + +static bool have_key(struct ceph_x_ticket_handler *th) +{ + if (th->have_key && ktime_get_real_seconds() >= th->expires) { + dout("ticket %d (%s) secret_id %llu expired\n", th->service, + ceph_entity_type_name(th->service), th->secret_id); + th->have_key = false; + } + + return th->have_key; +} + +static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed) +{ + int want = ac->want_keys; + struct ceph_x_info *xi = ac->private; + int service; + + *pneed = ac->want_keys & ~(xi->have_keys); + + for (service = 1; service <= want; service <<= 1) { + struct ceph_x_ticket_handler *th; + + if (!(ac->want_keys & service)) + continue; + + if (*pneed & service) + continue; + + th = get_ticket_handler(ac, service); + if (IS_ERR(th)) { + *pneed |= service; + continue; + } + + if (need_key(th)) + *pneed |= service; + if (!have_key(th)) + xi->have_keys &= ~service; + } +} + +static int ceph_x_build_request(struct ceph_auth_client *ac, + void *buf, void *end) +{ + struct ceph_x_info *xi = ac->private; + int need; + struct ceph_x_request_header *head = buf; + void *p; + int ret; + struct ceph_x_ticket_handler *th = + get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); + + if (IS_ERR(th)) + return PTR_ERR(th); + + ceph_x_validate_tickets(ac, &need); + dout("%s want 0x%x have 0x%x need 0x%x\n", __func__, ac->want_keys, + xi->have_keys, need); + + if (need & CEPH_ENTITY_TYPE_AUTH) { + struct ceph_x_authenticate *auth = (void *)(head + 1); + void *enc_buf = xi->auth_authorizer.enc_buf; + struct ceph_x_challenge_blob *blob = enc_buf + + ceph_x_encrypt_offset(); + u64 *u; + + p = auth + 1; + if (p > end) + return -ERANGE; + + dout(" get_auth_session_key\n"); + head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY); + + /* encrypt and hash */ + get_random_bytes(&auth->client_challenge, sizeof(u64)); + blob->client_challenge = auth->client_challenge; + blob->server_challenge = cpu_to_le64(xi->server_challenge); + ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN, + sizeof(*blob)); + if (ret < 0) + return ret; + + auth->struct_v = 3; /* nautilus+ */ + auth->key = 0; + for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++) + auth->key ^= *(__le64 *)u; + dout(" server_challenge %llx client_challenge %llx key %llx\n", + xi->server_challenge, le64_to_cpu(auth->client_challenge), + le64_to_cpu(auth->key)); + + /* now encode the old ticket if exists */ + ret = ceph_x_encode_ticket(th, &p, end); + if (ret < 0) + return ret; + + /* nautilus+: request service tickets at the same time */ + need = ac->want_keys & ~CEPH_ENTITY_TYPE_AUTH; + WARN_ON(!need); + ceph_encode_32_safe(&p, end, need, e_range); + return p - buf; + } + + if (need) { + dout(" get_principal_session_key\n"); + ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer); + if (ret) + return ret; + + p = buf; + ceph_encode_16_safe(&p, end, CEPHX_GET_PRINCIPAL_SESSION_KEY, + e_range); + ceph_encode_copy_safe(&p, end, + xi->auth_authorizer.buf->vec.iov_base, + xi->auth_authorizer.buf->vec.iov_len, e_range); + ceph_encode_8_safe(&p, end, 1, e_range); + ceph_encode_32_safe(&p, end, need, e_range); + return p - buf; + } + + return 0; + +e_range: + return -ERANGE; +} + +static int decode_con_secret(void **p, void *end, u8 *con_secret, + int *con_secret_len) +{ + int len; + + ceph_decode_32_safe(p, end, len, bad); + ceph_decode_need(p, end, len, bad); + + dout("%s len %d\n", __func__, len); + if (con_secret) { + if (len > CEPH_MAX_CON_SECRET_LEN) { + pr_err("connection secret too big %d\n", len); + goto bad_memzero; + } + memcpy(con_secret, *p, len); + *con_secret_len = len; + } + memzero_explicit(*p, len); + *p += len; + return 0; + +bad_memzero: + memzero_explicit(*p, len); +bad: + pr_err("failed to decode connection secret\n"); + return -EINVAL; +} + +static int handle_auth_session_key(struct ceph_auth_client *ac, u64 global_id, + void **p, void *end, + u8 *session_key, int *session_key_len, + u8 *con_secret, int *con_secret_len) +{ + struct ceph_x_info *xi = ac->private; + struct ceph_x_ticket_handler *th; + void *dp, *dend; + int len; + int ret; + + /* AUTH ticket */ + ret = ceph_x_proc_ticket_reply(ac, &xi->secret, p, end); + if (ret) + return ret; + + ceph_auth_set_global_id(ac, global_id); + if (*p == end) { + /* pre-nautilus (or didn't request service tickets!) */ + WARN_ON(session_key || con_secret); + return 0; + } + + th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); + if (IS_ERR(th)) + return PTR_ERR(th); + + if (session_key) { + memcpy(session_key, th->session_key.key, th->session_key.len); + *session_key_len = th->session_key.len; + } + + /* connection secret */ + ceph_decode_32_safe(p, end, len, e_inval); + dout("%s connection secret blob len %d\n", __func__, len); + if (len > 0) { + dp = *p + ceph_x_encrypt_offset(); + ret = ceph_x_decrypt(&th->session_key, p, *p + len); + if (ret < 0) + return ret; + + dout("%s decrypted %d bytes\n", __func__, ret); + dend = dp + ret; + + ret = decode_con_secret(&dp, dend, con_secret, con_secret_len); + if (ret) + return ret; + } + + /* service tickets */ + ceph_decode_32_safe(p, end, len, e_inval); + dout("%s service tickets blob len %d\n", __func__, len); + if (len > 0) { + ret = ceph_x_proc_ticket_reply(ac, &th->session_key, + p, *p + len); + if (ret) + return ret; + } + + return 0; + +e_inval: + return -EINVAL; +} + +static int ceph_x_handle_reply(struct ceph_auth_client *ac, u64 global_id, + void *buf, void *end, + u8 *session_key, int *session_key_len, + u8 *con_secret, int *con_secret_len) +{ + struct ceph_x_info *xi = ac->private; + struct ceph_x_ticket_handler *th; + int len = end - buf; + int result; + void *p; + int op; + int ret; + + if (xi->starting) { + /* it's a hello */ + struct ceph_x_server_challenge *sc = buf; + + if (len != sizeof(*sc)) + return -EINVAL; + xi->server_challenge = le64_to_cpu(sc->server_challenge); + dout("handle_reply got server challenge %llx\n", + xi->server_challenge); + xi->starting = false; + xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH; + return -EAGAIN; + } + + p = buf; + ceph_decode_16_safe(&p, end, op, e_inval); + ceph_decode_32_safe(&p, end, result, e_inval); + dout("handle_reply op %d result %d\n", op, result); + switch (op) { + case CEPHX_GET_AUTH_SESSION_KEY: + /* AUTH ticket + [connection secret] + service tickets */ + ret = handle_auth_session_key(ac, global_id, &p, end, + session_key, session_key_len, + con_secret, con_secret_len); + break; + + case CEPHX_GET_PRINCIPAL_SESSION_KEY: + th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); + if (IS_ERR(th)) + return PTR_ERR(th); + + /* service tickets */ + ret = ceph_x_proc_ticket_reply(ac, &th->session_key, &p, end); + break; + + default: + return -EINVAL; + } + if (ret) + return ret; + if (ac->want_keys == xi->have_keys) + return 0; + return -EAGAIN; + +e_inval: + return -EINVAL; +} + +static void ceph_x_destroy_authorizer(struct ceph_authorizer *a) +{ + struct ceph_x_authorizer *au = (void *)a; + + ceph_x_authorizer_cleanup(au); + kfree(au); +} + +static int ceph_x_create_authorizer( + struct ceph_auth_client *ac, int peer_type, + struct ceph_auth_handshake *auth) +{ + struct ceph_x_authorizer *au; + struct ceph_x_ticket_handler *th; + int ret; + + th = get_ticket_handler(ac, peer_type); + if (IS_ERR(th)) + return PTR_ERR(th); + + au = kzalloc(sizeof(*au), GFP_NOFS); + if (!au) + return -ENOMEM; + + au->base.destroy = ceph_x_destroy_authorizer; + + ret = ceph_x_build_authorizer(ac, th, au); + if (ret) { + kfree(au); + return ret; + } + + auth->authorizer = (struct ceph_authorizer *) au; + auth->authorizer_buf = au->buf->vec.iov_base; + auth->authorizer_buf_len = au->buf->vec.iov_len; + auth->authorizer_reply_buf = au->enc_buf; + auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN; + auth->sign_message = ac->ops->sign_message; + auth->check_message_signature = ac->ops->check_message_signature; + + return 0; +} + +static int ceph_x_update_authorizer( + struct ceph_auth_client *ac, int peer_type, + struct ceph_auth_handshake *auth) +{ + struct ceph_x_authorizer *au; + struct ceph_x_ticket_handler *th; + + th = get_ticket_handler(ac, peer_type); + if (IS_ERR(th)) + return PTR_ERR(th); + + au = (struct ceph_x_authorizer *)auth->authorizer; + if (au->secret_id < th->secret_id) { + dout("ceph_x_update_authorizer service %u secret %llu < %llu\n", + au->service, au->secret_id, th->secret_id); + return ceph_x_build_authorizer(ac, th, au); + } + return 0; +} + +/* + * CephXAuthorizeChallenge + */ +static int decrypt_authorizer_challenge(struct ceph_crypto_key *secret, + void *challenge, int challenge_len, + u64 *server_challenge) +{ + void *dp, *dend; + int ret; + + /* no leading len */ + ret = __ceph_x_decrypt(secret, challenge, challenge_len); + if (ret < 0) + return ret; + + dout("%s decrypted %d bytes\n", __func__, ret); + dp = challenge + sizeof(struct ceph_x_encrypt_header); + dend = dp + ret; + + ceph_decode_skip_8(&dp, dend, e_inval); /* struct_v */ + ceph_decode_64_safe(&dp, dend, *server_challenge, e_inval); + dout("%s server_challenge %llu\n", __func__, *server_challenge); + return 0; + +e_inval: + return -EINVAL; +} + +static int ceph_x_add_authorizer_challenge(struct ceph_auth_client *ac, + struct ceph_authorizer *a, + void *challenge, int challenge_len) +{ + struct ceph_x_authorizer *au = (void *)a; + u64 server_challenge; + int ret; + + ret = decrypt_authorizer_challenge(&au->session_key, challenge, + challenge_len, &server_challenge); + if (ret) { + pr_err("failed to decrypt authorize challenge: %d", ret); + return ret; + } + + ret = encrypt_authorizer(au, &server_challenge); + if (ret) { + pr_err("failed to encrypt authorizer w/ challenge: %d", ret); + return ret; + } + + return 0; +} + +/* + * CephXAuthorizeReply + */ +static int decrypt_authorizer_reply(struct ceph_crypto_key *secret, + void **p, void *end, u64 *nonce_plus_one, + u8 *con_secret, int *con_secret_len) +{ + void *dp, *dend; + u8 struct_v; + int ret; + + dp = *p + ceph_x_encrypt_offset(); + ret = ceph_x_decrypt(secret, p, end); + if (ret < 0) + return ret; + + dout("%s decrypted %d bytes\n", __func__, ret); + dend = dp + ret; + + ceph_decode_8_safe(&dp, dend, struct_v, e_inval); + ceph_decode_64_safe(&dp, dend, *nonce_plus_one, e_inval); + dout("%s nonce_plus_one %llu\n", __func__, *nonce_plus_one); + if (struct_v >= 2) { + ret = decode_con_secret(&dp, dend, con_secret, con_secret_len); + if (ret) + return ret; + } + + return 0; + +e_inval: + return -EINVAL; +} + +static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac, + struct ceph_authorizer *a, + void *reply, int reply_len, + u8 *session_key, int *session_key_len, + u8 *con_secret, int *con_secret_len) +{ + struct ceph_x_authorizer *au = (void *)a; + u64 nonce_plus_one; + int ret; + + if (session_key) { + memcpy(session_key, au->session_key.key, au->session_key.len); + *session_key_len = au->session_key.len; + } + + ret = decrypt_authorizer_reply(&au->session_key, &reply, + reply + reply_len, &nonce_plus_one, + con_secret, con_secret_len); + if (ret) + return ret; + + if (nonce_plus_one != au->nonce + 1) { + pr_err("failed to authenticate server\n"); + return -EPERM; + } + + return 0; +} + +static void ceph_x_reset(struct ceph_auth_client *ac) +{ + struct ceph_x_info *xi = ac->private; + + dout("reset\n"); + xi->starting = true; + xi->server_challenge = 0; +} + +static void ceph_x_destroy(struct ceph_auth_client *ac) +{ + struct ceph_x_info *xi = ac->private; + struct rb_node *p; + + dout("ceph_x_destroy %p\n", ac); + ceph_crypto_key_destroy(&xi->secret); + + while ((p = rb_first(&xi->ticket_handlers)) != NULL) { + struct ceph_x_ticket_handler *th = + rb_entry(p, struct ceph_x_ticket_handler, node); + remove_ticket_handler(ac, th); + } + + ceph_x_authorizer_cleanup(&xi->auth_authorizer); + + kfree(ac->private); + ac->private = NULL; +} + +static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type) +{ + struct ceph_x_ticket_handler *th; + + th = get_ticket_handler(ac, peer_type); + if (IS_ERR(th)) + return; + + if (th->have_key) { + dout("ticket %d (%s) secret_id %llu invalidated\n", + th->service, ceph_entity_type_name(th->service), + th->secret_id); + th->have_key = false; + } +} + +static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac, + int peer_type) +{ + /* + * We are to invalidate a service ticket in the hopes of + * getting a new, hopefully more valid, one. But, we won't get + * it unless our AUTH ticket is good, so invalidate AUTH ticket + * as well, just in case. + */ + invalidate_ticket(ac, peer_type); + invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH); +} + +static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg, + __le64 *psig) +{ + void *enc_buf = au->enc_buf; + int ret; + + if (!CEPH_HAVE_FEATURE(msg->con->peer_features, CEPHX_V2)) { + struct { + __le32 len; + __le32 header_crc; + __le32 front_crc; + __le32 middle_crc; + __le32 data_crc; + } __packed *sigblock = enc_buf + ceph_x_encrypt_offset(); + + sigblock->len = cpu_to_le32(4*sizeof(u32)); + sigblock->header_crc = msg->hdr.crc; + sigblock->front_crc = msg->footer.front_crc; + sigblock->middle_crc = msg->footer.middle_crc; + sigblock->data_crc = msg->footer.data_crc; + + ret = ceph_x_encrypt(&au->session_key, enc_buf, + CEPHX_AU_ENC_BUF_LEN, sizeof(*sigblock)); + if (ret < 0) + return ret; + + *psig = *(__le64 *)(enc_buf + sizeof(u32)); + } else { + struct { + __le32 header_crc; + __le32 front_crc; + __le32 front_len; + __le32 middle_crc; + __le32 middle_len; + __le32 data_crc; + __le32 data_len; + __le32 seq_lower_word; + } __packed *sigblock = enc_buf; + struct { + __le64 a, b, c, d; + } __packed *penc = enc_buf; + int ciphertext_len; + + sigblock->header_crc = msg->hdr.crc; + sigblock->front_crc = msg->footer.front_crc; + sigblock->front_len = msg->hdr.front_len; + sigblock->middle_crc = msg->footer.middle_crc; + sigblock->middle_len = msg->hdr.middle_len; + sigblock->data_crc = msg->footer.data_crc; + sigblock->data_len = msg->hdr.data_len; + sigblock->seq_lower_word = *(__le32 *)&msg->hdr.seq; + + /* no leading len, no ceph_x_encrypt_header */ + ret = ceph_crypt(&au->session_key, true, enc_buf, + CEPHX_AU_ENC_BUF_LEN, sizeof(*sigblock), + &ciphertext_len); + if (ret) + return ret; + + *psig = penc->a ^ penc->b ^ penc->c ^ penc->d; + } + + return 0; +} + +static int ceph_x_sign_message(struct ceph_auth_handshake *auth, + struct ceph_msg *msg) +{ + __le64 sig; + int ret; + + if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) + return 0; + + ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer, + msg, &sig); + if (ret) + return ret; + + msg->footer.sig = sig; + msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED; + return 0; +} + +static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth, + struct ceph_msg *msg) +{ + __le64 sig_check; + int ret; + + if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN)) + return 0; + + ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer, + msg, &sig_check); + if (ret) + return ret; + if (sig_check == msg->footer.sig) + return 0; + if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED) + dout("ceph_x_check_message_signature %p has signature %llx " + "expect %llx\n", msg, msg->footer.sig, sig_check); + else + dout("ceph_x_check_message_signature %p sender did not set " + "CEPH_MSG_FOOTER_SIGNED\n", msg); + return -EBADMSG; +} + +static const struct ceph_auth_client_ops ceph_x_ops = { + .is_authenticated = ceph_x_is_authenticated, + .should_authenticate = ceph_x_should_authenticate, + .build_request = ceph_x_build_request, + .handle_reply = ceph_x_handle_reply, + .create_authorizer = ceph_x_create_authorizer, + .update_authorizer = ceph_x_update_authorizer, + .add_authorizer_challenge = ceph_x_add_authorizer_challenge, + .verify_authorizer_reply = ceph_x_verify_authorizer_reply, + .invalidate_authorizer = ceph_x_invalidate_authorizer, + .reset = ceph_x_reset, + .destroy = ceph_x_destroy, + .sign_message = ceph_x_sign_message, + .check_message_signature = ceph_x_check_message_signature, +}; + + +int ceph_x_init(struct ceph_auth_client *ac) +{ + struct ceph_x_info *xi; + int ret; + + dout("ceph_x_init %p\n", ac); + ret = -ENOMEM; + xi = kzalloc(sizeof(*xi), GFP_NOFS); + if (!xi) + goto out; + + ret = -EINVAL; + if (!ac->key) { + pr_err("no secret set (for auth_x protocol)\n"); + goto out_nomem; + } + + ret = ceph_crypto_key_clone(&xi->secret, ac->key); + if (ret < 0) { + pr_err("cannot clone key: %d\n", ret); + goto out_nomem; + } + + xi->starting = true; + xi->ticket_handlers = RB_ROOT; + + ac->protocol = CEPH_AUTH_CEPHX; + ac->private = xi; + ac->ops = &ceph_x_ops; + return 0; + +out_nomem: + kfree(xi); +out: + return ret; +} |