cregit-Linux how code gets into the kernel

Release 4.8 net/ceph/auth_x.c

Directory: net/ceph
#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/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 need; ceph_x_validate_tickets(ac, &need); dout("ceph_x_is_authenticated want=%d need=%d have=%d\n", ac->want_keys, need, xi->have_keys); return (ac->want_keys & xi->have_keys) == ac->want_keys; }

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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("ceph_x_should_authenticate want=%d need=%d have=%d\n", ac->want_keys, need, xi->have_keys); return need != 0; }

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static int ceph_x_encrypt_buflen(int ilen) { return sizeof(struct ceph_x_encrypt_header) + ilen + 16 + sizeof(u32); }

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static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *ibuf, int ilen, void *obuf, size_t olen) { struct ceph_x_encrypt_header head = { .struct_v = 1, .magic = cpu_to_le64(CEPHX_ENC_MAGIC) }; size_t len = olen - sizeof(u32); int ret; ret = ceph_encrypt2(secret, obuf + sizeof(u32), &len, &head, sizeof(head), ibuf, ilen); if (ret) return ret; ceph_encode_32(&obuf, len); return len + sizeof(u32); }

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static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end, void **obuf, size_t olen) { struct ceph_x_encrypt_header head; size_t head_len = sizeof(head); int len, ret; len = ceph_decode_32(p); if (*p + len > end) return -EINVAL; dout("ceph_x_decrypt len %d\n", len); if (*obuf == NULL) { *obuf = kmalloc(len, GFP_NOFS); if (!*obuf) return -ENOMEM; olen = len; } ret = ceph_decrypt2(secret, &head, &head_len, *obuf, &olen, *p, len); if (ret) return ret; if (head.struct_v != 1 || le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC) return -EPERM; *p += len; return olen; }

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/* * 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; }

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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); }

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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 *dbuf = NULL; void *dp, *dend; int dlen; char is_enc; struct timespec validity; struct ceph_crypto_key old_key; void *ticket_buf = NULL; void *tp, *tpend; void **ptp; struct ceph_crypto_key new_session_key; struct ceph_buffer *new_ticket_blob; unsigned long 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 */ dlen = ceph_x_decrypt(secret, p, end, &dbuf, 0); if (dlen <= 0) { ret = dlen; goto out; } dout(" decrypted %d bytes\n", dlen); dp = dbuf; dend = dp + dlen; tkt_struct_v = ceph_decode_8(&dp); if (tkt_struct_v != 1) goto bad; memcpy(&old_key, &th->session_key, sizeof(old_key)); ret = ceph_crypto_key_decode(&new_session_key, &dp, dend); if (ret) goto out; ceph_decode_timespec(&validity, dp); dp += sizeof(struct ceph_timespec); new_expires = get_seconds() + validity.tv_sec; new_renew_after = new_expires - (validity.tv_sec / 4); dout(" expires=%lu renew_after=%lu\n", new_expires, new_renew_after); /* ticket blob for service */ ceph_decode_8_safe(p, end, is_enc, bad); if (is_enc) { /* encrypted */ dout(" encrypted ticket\n"); dlen = ceph_x_decrypt(&old_key, p, end, &ticket_buf, 0); if (dlen < 0) { ret = dlen; goto out; } tp = ticket_buf; ptp = &tp; tpend = *ptp + dlen; } 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); 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; out: kfree(ticket_buf); kfree(dbuf); return ret; bad: ret = -EINVAL; goto out; }

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static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac, struct ceph_crypto_key *secret, void *buf, void *end) { void *p = buf; 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; }

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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; } }

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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; void *p, *end; 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) + sizeof(msg_b) + ceph_x_encrypt_buflen(ticket_blob_len); 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; 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)); p = msg_a + 1; p += ticket_blob_len; end = au->buf->vec.iov_base + au->buf->vec.iov_len; get_random_bytes(&au->nonce, sizeof(au->nonce)); msg_b.struct_v = 1; msg_b.nonce = cpu_to_le64(au->nonce); ret = ceph_x_encrypt(&au->session_key, &msg_b, sizeof(msg_b), p, end - p); if (ret < 0) goto out_au; p += ret; au->buf->vec.iov_len = p - au->buf->vec.iov_base; dout(" built authorizer nonce %llx len %d\n", au->nonce, (int)au->buf->vec.iov_len); BUG_ON(au->buf->vec.iov_len > maxlen); return 0; out_au: ceph_x_authorizer_cleanup(au); return ret; }

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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; }

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static bool need_key(struct ceph_x_ticket_handler *th) { if (!th->have_key) return true; return get_seconds() >= th->renew_after; }

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static bool have_key(struct ceph_x_ticket_handler *th) { if (th->have_key) { if (get_seconds() >= th->expires) th->have_key = false; } return th->have_key; }

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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; } }

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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; 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("build_request want %x have %x need %x\n", ac->want_keys, xi->have_keys, need); if (need & CEPH_ENTITY_TYPE_AUTH) { struct ceph_x_authenticate *auth = (void *)(head + 1); void *p = auth + 1; struct ceph_x_challenge_blob tmp; char tmp_enc[40]; u64 *u; 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)); tmp.client_challenge = auth->client_challenge; tmp.server_challenge = cpu_to_le64(xi->server_challenge); ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp), tmp_enc, sizeof(tmp_enc)); if (ret < 0) return ret; auth->struct_v = 1; auth->key = 0; for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + 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; return p - buf; } if (need) { void *p = head + 1; struct ceph_x_service_ticket_request *req; if (p > end) return -ERANGE; head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY); ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer); if (ret) return ret; ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base, xi->auth_authorizer.buf->vec.iov_len); req = p; req->keys = cpu_to_le32(need); p += sizeof(*req); return p - buf; } return 0; }

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static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result, void *buf, void *end) { struct ceph_x_info *xi = ac->private; struct ceph_x_reply_header *head = buf; struct ceph_x_ticket_handler *th; int len = end - buf; int op; int ret; if (result) return result; /* XXX hmm? */ 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; } op = le16_to_cpu(head->op); result = le32_to_cpu(head->result); dout("handle_reply op %d result %d\n", op, result); switch (op) { case CEPHX_GET_AUTH_SESSION_KEY: /* verify auth key */ ret = ceph_x_proc_ticket_reply(ac, &xi->secret, buf + sizeof(*head), end); break; case CEPHX_GET_PRINCIPAL_SESSION_KEY: th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); if (IS_ERR(th)) return PTR_ERR(th)