1 files changed, 680 insertions, 0 deletions

diff --git a/fs/ceph/auth_x.c b/fs/ceph/auth_x.c
new file mode 100644
index 000000000000..d9001a4dc8cc
--- /dev/null
+++ b/fs/ceph/auth_x.c
@@ -0,0 +1,680 @@
+
+#include "ceph_debug.h"
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+
+#include "auth_x.h"
+#include "auth_x_protocol.h"
+#include "crypto.h"
+#include "auth.h"
+#include "decode.h"
+
+struct kmem_cache *ceph_x_ticketbuf_cachep;
+
+#define TEMP_TICKET_BUF_LEN     256
+
+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;
+}
+
+static int ceph_x_encrypt_buflen(int ilen)
+{
+        return sizeof(struct ceph_x_encrypt_header) + ilen + 16 +
+                sizeof(u32);
+}
+
+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);
+}
+
+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);
+        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;
+}
+
+/*
+ * get existing (or insert new) ticket handler
+ */
+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 ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
+                                    struct ceph_crypto_key *secret,
+                                    void *buf, void *end)
+{
+        struct ceph_x_info *xi = ac->private;
+        int num;
+        void *p = buf;
+        int ret;
+        char *dbuf;
+        char *ticket_buf;
+        u8 struct_v;
+
+        dbuf = kmem_cache_alloc(ceph_x_ticketbuf_cachep, GFP_NOFS | GFP_ATOMIC);
+        if (!dbuf)
+                return -ENOMEM;
+
+        ret = -ENOMEM;
+        ticket_buf = kmem_cache_alloc(ceph_x_ticketbuf_cachep,
+                                      GFP_NOFS | GFP_ATOMIC);
+        if (!ticket_buf)
+                goto out_dbuf;
+
+        ceph_decode_need(&p, end, 1 + sizeof(u32), bad);
+        struct_v = ceph_decode_8(&p);
+        if (struct_v != 1)
+                goto bad;
+        num = ceph_decode_32(&p);
+        dout("%d tickets\n", num);
+        while (num--) {
+                int type;
+                u8 struct_v;
+                struct ceph_x_ticket_handler *th;
+                void *dp, *dend;
+                int dlen;
+                char is_enc;
+                struct timespec validity;
+                struct ceph_crypto_key old_key;
+                void *tp, *tpend;
+                struct ceph_timespec new_validity;
+                struct ceph_crypto_key new_session_key;
+                struct ceph_buffer *new_ticket_blob;
+                unsigned long new_expires, new_renew_after;
+                u64 new_secret_id;
+
+                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));
+
+                struct_v = ceph_decode_8(&p);
+                if (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,
+                                      TEMP_TICKET_BUF_LEN);
+                if (dlen <= 0) {
+                        ret = dlen;
+                        goto out;
+                }
+                dout(" decrypted %d bytes\n", dlen);
+                dend = dbuf + dlen;
+                dp = dbuf;
+
+                struct_v = ceph_decode_8(&dp);
+                if (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_copy(&dp, &new_validity, sizeof(new_validity));
+                ceph_decode_timespec(&validity, &new_validity);
+                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);
+                tp = ticket_buf;
+                if (is_enc) {
+                        /* encrypted */
+                        dout(" encrypted ticket\n");
+                        dlen = ceph_x_decrypt(&old_key, &p, end, ticket_buf,
+                                              TEMP_TICKET_BUF_LEN);
+                        if (dlen < 0) {
+                                ret = dlen;
+                                goto out;
+                        }
+                        dlen = ceph_decode_32(&tp);
+                } else {
+                        /* unencrypted */
+                        ceph_decode_32_safe(&p, end, dlen, bad);
+                        ceph_decode_need(&p, end, dlen, bad);
+                        ceph_decode_copy(&p, ticket_buf, dlen);
+                }
+                tpend = tp + dlen;
+                dout(" ticket blob is %d bytes\n", dlen);
+                ceph_decode_need(&tp, tpend, 1 + sizeof(u64), bad);
+                struct_v = ceph_decode_8(&tp);
+                new_secret_id = ceph_decode_64(&tp);
+                ret = ceph_decode_buffer(&new_ticket_blob, &tp, 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->validity = new_validity;
+                th->secret_id = new_secret_id;
+                th->expires = new_expires;
+                th->renew_after = new_renew_after;
+                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;
+        }
+
+        ret = 0;
+out:
+        kmem_cache_free(ceph_x_ticketbuf_cachep, ticket_buf);
+out_dbuf:
+        kmem_cache_free(ceph_x_ticketbuf_cachep, dbuf);
+        return ret;
+
+bad:
+        ret = -EINVAL;
+        goto out;
+}
+
+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);
+
+        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)
+                        return -ENOMEM;
+        }
+        au->service = th->service;
+
+        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(&th->session_key, &msg_b, sizeof(msg_b),
+                             p, end - p);
+        if (ret < 0)
+                goto out_buf;
+        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_buf:
+        ceph_buffer_put(au->buf);
+        au->buf = NULL;
+        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 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 (!th) {
+                        *pneed |= service;
+                        continue;
+                }
+
+                if (get_seconds() >= th->renew_after)
+                        *pneed |= service;
+                if (get_seconds() >= th->expires)
+                        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;
+        int ret;
+        struct ceph_x_ticket_handler *th =
+                get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
+
+        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 ^= *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);
+
+                BUG_ON(!th);
+                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;
+}
+
+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 = le32_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);
+                BUG_ON(!th);
+                ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
+                                               buf + sizeof(*head), end);
+                break;
+
+        default:
+                return -EINVAL;
+        }
+        if (ret)
+                return ret;
+        if (ac->want_keys == xi->have_keys)
+                return 0;
+        return -EAGAIN;
+}
+
+static int ceph_x_create_authorizer(
+        struct ceph_auth_client *ac, int peer_type,
+        struct ceph_authorizer **a,
+        void **buf, size_t *len,
+        void **reply_buf, size_t *reply_len)
+{
+        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;
+
+        ret = ceph_x_build_authorizer(ac, th, au);
+        if (ret) {
+                kfree(au);
+                return ret;
+        }
+
+        *a = (struct ceph_authorizer *)au;
+        *buf = au->buf->vec.iov_base;
+        *len = au->buf->vec.iov_len;
+        *reply_buf = au->reply_buf;
+        *reply_len = sizeof(au->reply_buf);
+        return 0;
+}
+
+static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
+                                          struct ceph_authorizer *a, size_t len)
+{
+        struct ceph_x_authorizer *au = (void *)a;
+        struct ceph_x_ticket_handler *th;
+        int ret = 0;
+        struct ceph_x_authorize_reply reply;
+        void *p = au->reply_buf;
+        void *end = p + sizeof(au->reply_buf);
+
+        th = get_ticket_handler(ac, au->service);
+        if (!th)
+                return -EIO;  /* hrm! */
+        ret = ceph_x_decrypt(&th->session_key, &p, end, &reply, sizeof(reply));
+        if (ret < 0)
+                return ret;
+        if (ret != sizeof(reply))
+                return -EPERM;
+
+        if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one))
+                ret = -EPERM;
+        else
+                ret = 0;
+        dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
+             au->nonce, le64_to_cpu(reply.nonce_plus_one), ret);
+        return ret;
+}
+
+static void ceph_x_destroy_authorizer(struct ceph_auth_client *ac,
+                                      struct ceph_authorizer *a)
+{
+        struct ceph_x_authorizer *au = (void *)a;
+
+        ceph_buffer_put(au->buf);
+        kfree(au);
+}
+
+
+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);
+        }
+
+        kmem_cache_destroy(ceph_x_ticketbuf_cachep);
+
+        kfree(ac->private);
+        ac->private = NULL;
+}
+
+static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
+                                   int peer_type)
+{
+        struct ceph_x_ticket_handler *th;
+
+        th = get_ticket_handler(ac, peer_type);
+        if (th && !IS_ERR(th))
+                remove_ticket_handler(ac, th);
+}
+
+
+static const struct ceph_auth_client_ops ceph_x_ops = {
+        .is_authenticated = ceph_x_is_authenticated,
+        .build_request = ceph_x_build_request,
+        .handle_reply = ceph_x_handle_reply,
+        .create_authorizer = ceph_x_create_authorizer,
+        .verify_authorizer_reply = ceph_x_verify_authorizer_reply,
+        .destroy_authorizer = ceph_x_destroy_authorizer,
+        .invalidate_authorizer = ceph_x_invalidate_authorizer,
+        .reset =  ceph_x_reset,
+        .destroy = ceph_x_destroy,
+};
+
+
+int ceph_x_init(struct ceph_auth_client *ac)
+{
+        struct ceph_x_info *xi;
+        int ret;
+
+        dout("ceph_x_init %p\n", ac);
+        xi = kzalloc(sizeof(*xi), GFP_NOFS);
+        if (!xi)
+                return -ENOMEM;
+
+        ret = -ENOMEM;
+        ceph_x_ticketbuf_cachep = kmem_cache_create("ceph_x_ticketbuf",
+                                      TEMP_TICKET_BUF_LEN, 8,
+                                      (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
+                                      NULL);
+        if (!ceph_x_ticketbuf_cachep)
+                goto done_nomem;
+        ret = -EINVAL;
+        if (!ac->secret) {
+                pr_err("no secret set (for auth_x protocol)\n");
+                goto done_nomem;
+        }
+
+        ret = ceph_crypto_key_unarmor(&xi->secret, ac->secret);
+        if (ret)
+                goto done_nomem;
+
+        xi->starting = true;
+        xi->ticket_handlers = RB_ROOT;
+
+        ac->protocol = CEPH_AUTH_CEPHX;
+        ac->private = xi;
+        ac->ops = &ceph_x_ops;
+        return 0;
+
+done_nomem:
+        kfree(xi);
+        if (ceph_x_ticketbuf_cachep)
+                kmem_cache_destroy(ceph_x_ticketbuf_cachep);
+        return ret;
+}
+
+