| /* |
| * Modifications for Lustre |
| * |
| * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. |
| * |
| * Copyright (c) 2011, 2012, Intel Corporation. |
| * |
| * Author: Eric Mei <ericm@clusterfs.com> |
| */ |
| |
| /* |
| * Neil Brown <neilb@cse.unsw.edu.au> |
| * J. Bruce Fields <bfields@umich.edu> |
| * Andy Adamson <andros@umich.edu> |
| * Dug Song <dugsong@monkey.org> |
| * |
| * RPCSEC_GSS server authentication. |
| * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078 |
| * (gssapi) |
| * |
| * The RPCSEC_GSS involves three stages: |
| * 1/ context creation |
| * 2/ data exchange |
| * 3/ context destruction |
| * |
| * Context creation is handled largely by upcalls to user-space. |
| * In particular, GSS_Accept_sec_context is handled by an upcall |
| * Data exchange is handled entirely within the kernel |
| * In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel. |
| * Context destruction is handled in-kernel |
| * GSS_Delete_sec_context is in-kernel |
| * |
| * Context creation is initiated by a RPCSEC_GSS_INIT request arriving. |
| * The context handle and gss_token are used as a key into the rpcsec_init cache. |
| * The content of this cache includes some of the outputs of GSS_Accept_sec_context, |
| * being major_status, minor_status, context_handle, reply_token. |
| * These are sent back to the client. |
| * Sequence window management is handled by the kernel. The window size if currently |
| * a compile time constant. |
| * |
| * When user-space is happy that a context is established, it places an entry |
| * in the rpcsec_context cache. The key for this cache is the context_handle. |
| * The content includes: |
| * uid/gidlist - for determining access rights |
| * mechanism type |
| * mechanism specific information, such as a key |
| * |
| */ |
| |
| #define DEBUG_SUBSYSTEM S_SEC |
| #include <linux/types.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/hash.h> |
| #include <linux/mutex.h> |
| #include <linux/sunrpc/cache.h> |
| |
| #include <obd.h> |
| #include <obd_class.h> |
| #include <obd_support.h> |
| #include <lustre/lustre_idl.h> |
| #include <lustre_net.h> |
| #include <lustre_import.h> |
| #include <lustre_sec.h> |
| |
| #include "gss_err.h" |
| #include "gss_internal.h" |
| #include "gss_api.h" |
| |
| #define GSS_SVC_UPCALL_TIMEOUT (20) |
| |
| static spinlock_t __ctx_index_lock; |
| static __u64 __ctx_index; |
| |
| __u64 gss_get_next_ctx_index(void) |
| { |
| __u64 idx; |
| |
| spin_lock(&__ctx_index_lock); |
| idx = __ctx_index++; |
| spin_unlock(&__ctx_index_lock); |
| |
| return idx; |
| } |
| |
| static inline unsigned long hash_mem(char *buf, int length, int bits) |
| { |
| unsigned long hash = 0; |
| unsigned long l = 0; |
| int len = 0; |
| unsigned char c; |
| |
| do { |
| if (len == length) { |
| c = (char) len; |
| len = -1; |
| } else |
| c = *buf++; |
| |
| l = (l << 8) | c; |
| len++; |
| |
| if ((len & (BITS_PER_LONG/8-1)) == 0) |
| hash = cfs_hash_long(hash^l, BITS_PER_LONG); |
| } while (len); |
| |
| return hash >> (BITS_PER_LONG - bits); |
| } |
| |
| /**************************************** |
| * rsi cache * |
| ****************************************/ |
| |
| #define RSI_HASHBITS (6) |
| #define RSI_HASHMAX (1 << RSI_HASHBITS) |
| #define RSI_HASHMASK (RSI_HASHMAX - 1) |
| |
| struct rsi { |
| struct cache_head h; |
| __u32 lustre_svc; |
| __u64 nid; |
| wait_queue_head_t waitq; |
| rawobj_t in_handle, in_token; |
| rawobj_t out_handle, out_token; |
| int major_status, minor_status; |
| }; |
| |
| static struct cache_head *rsi_table[RSI_HASHMAX]; |
| static struct cache_detail rsi_cache; |
| static struct rsi *rsi_update(struct rsi *new, struct rsi *old); |
| static struct rsi *rsi_lookup(struct rsi *item); |
| |
| static inline int rsi_hash(struct rsi *item) |
| { |
| return hash_mem((char *)item->in_handle.data, item->in_handle.len, |
| RSI_HASHBITS) ^ |
| hash_mem((char *)item->in_token.data, item->in_token.len, |
| RSI_HASHBITS); |
| } |
| |
| static inline int __rsi_match(struct rsi *item, struct rsi *tmp) |
| { |
| return (rawobj_equal(&item->in_handle, &tmp->in_handle) && |
| rawobj_equal(&item->in_token, &tmp->in_token)); |
| } |
| |
| static void rsi_free(struct rsi *rsi) |
| { |
| rawobj_free(&rsi->in_handle); |
| rawobj_free(&rsi->in_token); |
| rawobj_free(&rsi->out_handle); |
| rawobj_free(&rsi->out_token); |
| } |
| |
| static void rsi_request(struct cache_detail *cd, |
| struct cache_head *h, |
| char **bpp, int *blen) |
| { |
| struct rsi *rsi = container_of(h, struct rsi, h); |
| __u64 index = 0; |
| |
| /* if in_handle is null, provide kernel suggestion */ |
| if (rsi->in_handle.len == 0) |
| index = gss_get_next_ctx_index(); |
| |
| qword_addhex(bpp, blen, (char *) &rsi->lustre_svc, |
| sizeof(rsi->lustre_svc)); |
| qword_addhex(bpp, blen, (char *) &rsi->nid, sizeof(rsi->nid)); |
| qword_addhex(bpp, blen, (char *) &index, sizeof(index)); |
| qword_addhex(bpp, blen, rsi->in_handle.data, rsi->in_handle.len); |
| qword_addhex(bpp, blen, rsi->in_token.data, rsi->in_token.len); |
| (*bpp)[-1] = '\n'; |
| } |
| |
| static int rsi_upcall(struct cache_detail *cd, struct cache_head *h) |
| { |
| return sunrpc_cache_pipe_upcall(cd, h, rsi_request); |
| } |
| |
| static inline void __rsi_init(struct rsi *new, struct rsi *item) |
| { |
| new->out_handle = RAWOBJ_EMPTY; |
| new->out_token = RAWOBJ_EMPTY; |
| |
| new->in_handle = item->in_handle; |
| item->in_handle = RAWOBJ_EMPTY; |
| new->in_token = item->in_token; |
| item->in_token = RAWOBJ_EMPTY; |
| |
| new->lustre_svc = item->lustre_svc; |
| new->nid = item->nid; |
| init_waitqueue_head(&new->waitq); |
| } |
| |
| static inline void __rsi_update(struct rsi *new, struct rsi *item) |
| { |
| LASSERT(new->out_handle.len == 0); |
| LASSERT(new->out_token.len == 0); |
| |
| new->out_handle = item->out_handle; |
| item->out_handle = RAWOBJ_EMPTY; |
| new->out_token = item->out_token; |
| item->out_token = RAWOBJ_EMPTY; |
| |
| new->major_status = item->major_status; |
| new->minor_status = item->minor_status; |
| } |
| |
| static void rsi_put(struct kref *ref) |
| { |
| struct rsi *rsi = container_of(ref, struct rsi, h.ref); |
| |
| LASSERT(rsi->h.next == NULL); |
| rsi_free(rsi); |
| OBD_FREE_PTR(rsi); |
| } |
| |
| static int rsi_match(struct cache_head *a, struct cache_head *b) |
| { |
| struct rsi *item = container_of(a, struct rsi, h); |
| struct rsi *tmp = container_of(b, struct rsi, h); |
| |
| return __rsi_match(item, tmp); |
| } |
| |
| static void rsi_init(struct cache_head *cnew, struct cache_head *citem) |
| { |
| struct rsi *new = container_of(cnew, struct rsi, h); |
| struct rsi *item = container_of(citem, struct rsi, h); |
| |
| __rsi_init(new, item); |
| } |
| |
| static void update_rsi(struct cache_head *cnew, struct cache_head *citem) |
| { |
| struct rsi *new = container_of(cnew, struct rsi, h); |
| struct rsi *item = container_of(citem, struct rsi, h); |
| |
| __rsi_update(new, item); |
| } |
| |
| static struct cache_head *rsi_alloc(void) |
| { |
| struct rsi *rsi; |
| |
| OBD_ALLOC_PTR(rsi); |
| if (rsi) |
| return &rsi->h; |
| else |
| return NULL; |
| } |
| |
| static int rsi_parse(struct cache_detail *cd, char *mesg, int mlen) |
| { |
| char *buf = mesg; |
| char *ep; |
| int len; |
| struct rsi rsii, *rsip = NULL; |
| time_t expiry; |
| int status = -EINVAL; |
| ENTRY; |
| |
| |
| memset(&rsii, 0, sizeof(rsii)); |
| |
| /* handle */ |
| len = qword_get(&mesg, buf, mlen); |
| if (len < 0) |
| goto out; |
| if (rawobj_alloc(&rsii.in_handle, buf, len)) { |
| status = -ENOMEM; |
| goto out; |
| } |
| |
| /* token */ |
| len = qword_get(&mesg, buf, mlen); |
| if (len < 0) |
| goto out; |
| if (rawobj_alloc(&rsii.in_token, buf, len)) { |
| status = -ENOMEM; |
| goto out; |
| } |
| |
| rsip = rsi_lookup(&rsii); |
| if (!rsip) |
| goto out; |
| |
| rsii.h.flags = 0; |
| /* expiry */ |
| expiry = get_expiry(&mesg); |
| if (expiry == 0) |
| goto out; |
| |
| len = qword_get(&mesg, buf, mlen); |
| if (len <= 0) |
| goto out; |
| |
| /* major */ |
| rsii.major_status = simple_strtol(buf, &ep, 10); |
| if (*ep) |
| goto out; |
| |
| /* minor */ |
| len = qword_get(&mesg, buf, mlen); |
| if (len <= 0) |
| goto out; |
| rsii.minor_status = simple_strtol(buf, &ep, 10); |
| if (*ep) |
| goto out; |
| |
| /* out_handle */ |
| len = qword_get(&mesg, buf, mlen); |
| if (len < 0) |
| goto out; |
| if (rawobj_alloc(&rsii.out_handle, buf, len)) { |
| status = -ENOMEM; |
| goto out; |
| } |
| |
| /* out_token */ |
| len = qword_get(&mesg, buf, mlen); |
| if (len < 0) |
| goto out; |
| if (rawobj_alloc(&rsii.out_token, buf, len)) { |
| status = -ENOMEM; |
| goto out; |
| } |
| |
| rsii.h.expiry_time = expiry; |
| rsip = rsi_update(&rsii, rsip); |
| status = 0; |
| out: |
| rsi_free(&rsii); |
| if (rsip) { |
| wake_up_all(&rsip->waitq); |
| cache_put(&rsip->h, &rsi_cache); |
| } else { |
| status = -ENOMEM; |
| } |
| |
| if (status) |
| CERROR("rsi parse error %d\n", status); |
| RETURN(status); |
| } |
| |
| static struct cache_detail rsi_cache = { |
| .hash_size = RSI_HASHMAX, |
| .hash_table = rsi_table, |
| .name = "auth.sptlrpc.init", |
| .cache_put = rsi_put, |
| .cache_upcall = rsi_upcall, |
| .cache_parse = rsi_parse, |
| .match = rsi_match, |
| .init = rsi_init, |
| .update = update_rsi, |
| .alloc = rsi_alloc, |
| }; |
| |
| static struct rsi *rsi_lookup(struct rsi *item) |
| { |
| struct cache_head *ch; |
| int hash = rsi_hash(item); |
| |
| ch = sunrpc_cache_lookup(&rsi_cache, &item->h, hash); |
| if (ch) |
| return container_of(ch, struct rsi, h); |
| else |
| return NULL; |
| } |
| |
| static struct rsi *rsi_update(struct rsi *new, struct rsi *old) |
| { |
| struct cache_head *ch; |
| int hash = rsi_hash(new); |
| |
| ch = sunrpc_cache_update(&rsi_cache, &new->h, &old->h, hash); |
| if (ch) |
| return container_of(ch, struct rsi, h); |
| else |
| return NULL; |
| } |
| |
| /**************************************** |
| * rsc cache * |
| ****************************************/ |
| |
| #define RSC_HASHBITS (10) |
| #define RSC_HASHMAX (1 << RSC_HASHBITS) |
| #define RSC_HASHMASK (RSC_HASHMAX - 1) |
| |
| struct rsc { |
| struct cache_head h; |
| struct obd_device *target; |
| rawobj_t handle; |
| struct gss_svc_ctx ctx; |
| }; |
| |
| static struct cache_head *rsc_table[RSC_HASHMAX]; |
| static struct cache_detail rsc_cache; |
| static struct rsc *rsc_update(struct rsc *new, struct rsc *old); |
| static struct rsc *rsc_lookup(struct rsc *item); |
| |
| static void rsc_free(struct rsc *rsci) |
| { |
| rawobj_free(&rsci->handle); |
| rawobj_free(&rsci->ctx.gsc_rvs_hdl); |
| lgss_delete_sec_context(&rsci->ctx.gsc_mechctx); |
| } |
| |
| static inline int rsc_hash(struct rsc *rsci) |
| { |
| return hash_mem((char *)rsci->handle.data, |
| rsci->handle.len, RSC_HASHBITS); |
| } |
| |
| static inline int __rsc_match(struct rsc *new, struct rsc *tmp) |
| { |
| return rawobj_equal(&new->handle, &tmp->handle); |
| } |
| |
| static inline void __rsc_init(struct rsc *new, struct rsc *tmp) |
| { |
| new->handle = tmp->handle; |
| tmp->handle = RAWOBJ_EMPTY; |
| |
| new->target = NULL; |
| memset(&new->ctx, 0, sizeof(new->ctx)); |
| new->ctx.gsc_rvs_hdl = RAWOBJ_EMPTY; |
| } |
| |
| static inline void __rsc_update(struct rsc *new, struct rsc *tmp) |
| { |
| new->ctx = tmp->ctx; |
| tmp->ctx.gsc_rvs_hdl = RAWOBJ_EMPTY; |
| tmp->ctx.gsc_mechctx = NULL; |
| |
| memset(&new->ctx.gsc_seqdata, 0, sizeof(new->ctx.gsc_seqdata)); |
| spin_lock_init(&new->ctx.gsc_seqdata.ssd_lock); |
| } |
| |
| static void rsc_put(struct kref *ref) |
| { |
| struct rsc *rsci = container_of(ref, struct rsc, h.ref); |
| |
| LASSERT(rsci->h.next == NULL); |
| rsc_free(rsci); |
| OBD_FREE_PTR(rsci); |
| } |
| |
| static int rsc_match(struct cache_head *a, struct cache_head *b) |
| { |
| struct rsc *new = container_of(a, struct rsc, h); |
| struct rsc *tmp = container_of(b, struct rsc, h); |
| |
| return __rsc_match(new, tmp); |
| } |
| |
| static void rsc_init(struct cache_head *cnew, struct cache_head *ctmp) |
| { |
| struct rsc *new = container_of(cnew, struct rsc, h); |
| struct rsc *tmp = container_of(ctmp, struct rsc, h); |
| |
| __rsc_init(new, tmp); |
| } |
| |
| static void update_rsc(struct cache_head *cnew, struct cache_head *ctmp) |
| { |
| struct rsc *new = container_of(cnew, struct rsc, h); |
| struct rsc *tmp = container_of(ctmp, struct rsc, h); |
| |
| __rsc_update(new, tmp); |
| } |
| |
| static struct cache_head * rsc_alloc(void) |
| { |
| struct rsc *rsc; |
| |
| OBD_ALLOC_PTR(rsc); |
| if (rsc) |
| return &rsc->h; |
| else |
| return NULL; |
| } |
| |
| static int rsc_parse(struct cache_detail *cd, char *mesg, int mlen) |
| { |
| char *buf = mesg; |
| int len, rv, tmp_int; |
| struct rsc rsci, *rscp = NULL; |
| time_t expiry; |
| int status = -EINVAL; |
| struct gss_api_mech *gm = NULL; |
| |
| memset(&rsci, 0, sizeof(rsci)); |
| |
| /* context handle */ |
| len = qword_get(&mesg, buf, mlen); |
| if (len < 0) goto out; |
| status = -ENOMEM; |
| if (rawobj_alloc(&rsci.handle, buf, len)) |
| goto out; |
| |
| rsci.h.flags = 0; |
| /* expiry */ |
| expiry = get_expiry(&mesg); |
| status = -EINVAL; |
| if (expiry == 0) |
| goto out; |
| |
| /* remote flag */ |
| rv = get_int(&mesg, &tmp_int); |
| if (rv) { |
| CERROR("fail to get remote flag\n"); |
| goto out; |
| } |
| rsci.ctx.gsc_remote = (tmp_int != 0); |
| |
| /* root user flag */ |
| rv = get_int(&mesg, &tmp_int); |
| if (rv) { |
| CERROR("fail to get oss user flag\n"); |
| goto out; |
| } |
| rsci.ctx.gsc_usr_root = (tmp_int != 0); |
| |
| /* mds user flag */ |
| rv = get_int(&mesg, &tmp_int); |
| if (rv) { |
| CERROR("fail to get mds user flag\n"); |
| goto out; |
| } |
| rsci.ctx.gsc_usr_mds = (tmp_int != 0); |
| |
| /* oss user flag */ |
| rv = get_int(&mesg, &tmp_int); |
| if (rv) { |
| CERROR("fail to get oss user flag\n"); |
| goto out; |
| } |
| rsci.ctx.gsc_usr_oss = (tmp_int != 0); |
| |
| /* mapped uid */ |
| rv = get_int(&mesg, (int *) &rsci.ctx.gsc_mapped_uid); |
| if (rv) { |
| CERROR("fail to get mapped uid\n"); |
| goto out; |
| } |
| |
| rscp = rsc_lookup(&rsci); |
| if (!rscp) |
| goto out; |
| |
| /* uid, or NEGATIVE */ |
| rv = get_int(&mesg, (int *) &rsci.ctx.gsc_uid); |
| if (rv == -EINVAL) |
| goto out; |
| if (rv == -ENOENT) { |
| CERROR("NOENT? set rsc entry negative\n"); |
| set_bit(CACHE_NEGATIVE, &rsci.h.flags); |
| } else { |
| rawobj_t tmp_buf; |
| unsigned long ctx_expiry; |
| |
| /* gid */ |
| if (get_int(&mesg, (int *) &rsci.ctx.gsc_gid)) |
| goto out; |
| |
| /* mech name */ |
| len = qword_get(&mesg, buf, mlen); |
| if (len < 0) |
| goto out; |
| gm = lgss_name_to_mech(buf); |
| status = -EOPNOTSUPP; |
| if (!gm) |
| goto out; |
| |
| status = -EINVAL; |
| /* mech-specific data: */ |
| len = qword_get(&mesg, buf, mlen); |
| if (len < 0) |
| goto out; |
| |
| tmp_buf.len = len; |
| tmp_buf.data = (unsigned char *)buf; |
| if (lgss_import_sec_context(&tmp_buf, gm, |
| &rsci.ctx.gsc_mechctx)) |
| goto out; |
| |
| /* currently the expiry time passed down from user-space |
| * is invalid, here we retrive it from mech. */ |
| if (lgss_inquire_context(rsci.ctx.gsc_mechctx, &ctx_expiry)) { |
| CERROR("unable to get expire time, drop it\n"); |
| goto out; |
| } |
| expiry = (time_t) ctx_expiry; |
| } |
| |
| rsci.h.expiry_time = expiry; |
| rscp = rsc_update(&rsci, rscp); |
| status = 0; |
| out: |
| if (gm) |
| lgss_mech_put(gm); |
| rsc_free(&rsci); |
| if (rscp) |
| cache_put(&rscp->h, &rsc_cache); |
| else |
| status = -ENOMEM; |
| |
| if (status) |
| CERROR("parse rsc error %d\n", status); |
| return status; |
| } |
| |
| static struct cache_detail rsc_cache = { |
| .hash_size = RSC_HASHMAX, |
| .hash_table = rsc_table, |
| .name = "auth.sptlrpc.context", |
| .cache_put = rsc_put, |
| .cache_parse = rsc_parse, |
| .match = rsc_match, |
| .init = rsc_init, |
| .update = update_rsc, |
| .alloc = rsc_alloc, |
| }; |
| |
| static struct rsc *rsc_lookup(struct rsc *item) |
| { |
| struct cache_head *ch; |
| int hash = rsc_hash(item); |
| |
| ch = sunrpc_cache_lookup(&rsc_cache, &item->h, hash); |
| if (ch) |
| return container_of(ch, struct rsc, h); |
| else |
| return NULL; |
| } |
| |
| static struct rsc *rsc_update(struct rsc *new, struct rsc *old) |
| { |
| struct cache_head *ch; |
| int hash = rsc_hash(new); |
| |
| ch = sunrpc_cache_update(&rsc_cache, &new->h, &old->h, hash); |
| if (ch) |
| return container_of(ch, struct rsc, h); |
| else |
| return NULL; |
| } |
| |
| #define COMPAT_RSC_PUT(item, cd) cache_put((item), (cd)) |
| |
| /**************************************** |
| * rsc cache flush * |
| ****************************************/ |
| |
| typedef int rsc_entry_match(struct rsc *rscp, long data); |
| |
| static void rsc_flush(rsc_entry_match *match, long data) |
| { |
| struct cache_head **ch; |
| struct rsc *rscp; |
| int n; |
| ENTRY; |
| |
| write_lock(&rsc_cache.hash_lock); |
| for (n = 0; n < RSC_HASHMAX; n++) { |
| for (ch = &rsc_cache.hash_table[n]; *ch;) { |
| rscp = container_of(*ch, struct rsc, h); |
| |
| if (!match(rscp, data)) { |
| ch = &((*ch)->next); |
| continue; |
| } |
| |
| /* it seems simply set NEGATIVE doesn't work */ |
| *ch = (*ch)->next; |
| rscp->h.next = NULL; |
| cache_get(&rscp->h); |
| set_bit(CACHE_NEGATIVE, &rscp->h.flags); |
| COMPAT_RSC_PUT(&rscp->h, &rsc_cache); |
| rsc_cache.entries--; |
| } |
| } |
| write_unlock(&rsc_cache.hash_lock); |
| EXIT; |
| } |
| |
| static int match_uid(struct rsc *rscp, long uid) |
| { |
| if ((int) uid == -1) |
| return 1; |
| return ((int) rscp->ctx.gsc_uid == (int) uid); |
| } |
| |
| static int match_target(struct rsc *rscp, long target) |
| { |
| return (rscp->target == (struct obd_device *) target); |
| } |
| |
| static inline void rsc_flush_uid(int uid) |
| { |
| if (uid == -1) |
| CWARN("flush all gss contexts...\n"); |
| |
| rsc_flush(match_uid, (long) uid); |
| } |
| |
| static inline void rsc_flush_target(struct obd_device *target) |
| { |
| rsc_flush(match_target, (long) target); |
| } |
| |
| void gss_secsvc_flush(struct obd_device *target) |
| { |
| rsc_flush_target(target); |
| } |
| EXPORT_SYMBOL(gss_secsvc_flush); |
| |
| static struct rsc *gss_svc_searchbyctx(rawobj_t *handle) |
| { |
| struct rsc rsci; |
| struct rsc *found; |
| |
| memset(&rsci, 0, sizeof(rsci)); |
| if (rawobj_dup(&rsci.handle, handle)) |
| return NULL; |
| |
| found = rsc_lookup(&rsci); |
| rsc_free(&rsci); |
| if (!found) |
| return NULL; |
| if (cache_check(&rsc_cache, &found->h, NULL)) |
| return NULL; |
| return found; |
| } |
| |
| int gss_svc_upcall_install_rvs_ctx(struct obd_import *imp, |
| struct gss_sec *gsec, |
| struct gss_cli_ctx *gctx) |
| { |
| struct rsc rsci, *rscp = NULL; |
| unsigned long ctx_expiry; |
| __u32 major; |
| int rc; |
| ENTRY; |
| |
| memset(&rsci, 0, sizeof(rsci)); |
| |
| if (rawobj_alloc(&rsci.handle, (char *) &gsec->gs_rvs_hdl, |
| sizeof(gsec->gs_rvs_hdl))) |
| GOTO(out, rc = -ENOMEM); |
| |
| rscp = rsc_lookup(&rsci); |
| if (rscp == NULL) |
| GOTO(out, rc = -ENOMEM); |
| |
| major = lgss_copy_reverse_context(gctx->gc_mechctx, |
| &rsci.ctx.gsc_mechctx); |
| if (major != GSS_S_COMPLETE) |
| GOTO(out, rc = -ENOMEM); |
| |
| if (lgss_inquire_context(rsci.ctx.gsc_mechctx, &ctx_expiry)) { |
| CERROR("unable to get expire time, drop it\n"); |
| GOTO(out, rc = -EINVAL); |
| } |
| rsci.h.expiry_time = (time_t) ctx_expiry; |
| |
| if (strcmp(imp->imp_obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0) |
| rsci.ctx.gsc_usr_mds = 1; |
| else if (strcmp(imp->imp_obd->obd_type->typ_name, LUSTRE_OSC_NAME) == 0) |
| rsci.ctx.gsc_usr_oss = 1; |
| else |
| rsci.ctx.gsc_usr_root = 1; |
| |
| rscp = rsc_update(&rsci, rscp); |
| if (rscp == NULL) |
| GOTO(out, rc = -ENOMEM); |
| |
| rscp->target = imp->imp_obd; |
| rawobj_dup(&gctx->gc_svc_handle, &rscp->handle); |
| |
| CWARN("create reverse svc ctx %p to %s: idx "LPX64"\n", |
| &rscp->ctx, obd2cli_tgt(imp->imp_obd), gsec->gs_rvs_hdl); |
| rc = 0; |
| out: |
| if (rscp) |
| cache_put(&rscp->h, &rsc_cache); |
| rsc_free(&rsci); |
| |
| if (rc) |
| CERROR("create reverse svc ctx: idx "LPX64", rc %d\n", |
| gsec->gs_rvs_hdl, rc); |
| RETURN(rc); |
| } |
| |
| int gss_svc_upcall_expire_rvs_ctx(rawobj_t *handle) |
| { |
| const cfs_time_t expire = 20; |
| struct rsc *rscp; |
| |
| rscp = gss_svc_searchbyctx(handle); |
| if (rscp) { |
| CDEBUG(D_SEC, "reverse svcctx %p (rsc %p) expire soon\n", |
| &rscp->ctx, rscp); |
| |
| rscp->h.expiry_time = cfs_time_current_sec() + expire; |
| COMPAT_RSC_PUT(&rscp->h, &rsc_cache); |
| } |
| return 0; |
| } |
| |
| int gss_svc_upcall_dup_handle(rawobj_t *handle, struct gss_svc_ctx *ctx) |
| { |
| struct rsc *rscp = container_of(ctx, struct rsc, ctx); |
| |
| return rawobj_dup(handle, &rscp->handle); |
| } |
| |
| int gss_svc_upcall_update_sequence(rawobj_t *handle, __u32 seq) |
| { |
| struct rsc *rscp; |
| |
| rscp = gss_svc_searchbyctx(handle); |
| if (rscp) { |
| CDEBUG(D_SEC, "reverse svcctx %p (rsc %p) update seq to %u\n", |
| &rscp->ctx, rscp, seq + 1); |
| |
| rscp->ctx.gsc_rvs_seq = seq + 1; |
| COMPAT_RSC_PUT(&rscp->h, &rsc_cache); |
| } |
| return 0; |
| } |
| |
| static struct cache_deferred_req* cache_upcall_defer(struct cache_req *req) |
| { |
| return NULL; |
| } |
| static struct cache_req cache_upcall_chandle = { cache_upcall_defer }; |
| |
| int gss_svc_upcall_handle_init(struct ptlrpc_request *req, |
| struct gss_svc_reqctx *grctx, |
| struct gss_wire_ctx *gw, |
| struct obd_device *target, |
| __u32 lustre_svc, |
| rawobj_t *rvs_hdl, |
| rawobj_t *in_token) |
| { |
| struct ptlrpc_reply_state *rs; |
| struct rsc *rsci = NULL; |
| struct rsi *rsip = NULL, rsikey; |
| wait_queue_t wait; |
| int replen = sizeof(struct ptlrpc_body); |
| struct gss_rep_header *rephdr; |
| int first_check = 1; |
| int rc = SECSVC_DROP; |
| ENTRY; |
| |
| memset(&rsikey, 0, sizeof(rsikey)); |
| rsikey.lustre_svc = lustre_svc; |
| rsikey.nid = (__u64) req->rq_peer.nid; |
| |
| /* duplicate context handle. for INIT it always 0 */ |
| if (rawobj_dup(&rsikey.in_handle, &gw->gw_handle)) { |
| CERROR("fail to dup context handle\n"); |
| GOTO(out, rc); |
| } |
| |
| if (rawobj_dup(&rsikey.in_token, in_token)) { |
| CERROR("can't duplicate token\n"); |
| rawobj_free(&rsikey.in_handle); |
| GOTO(out, rc); |
| } |
| |
| rsip = rsi_lookup(&rsikey); |
| rsi_free(&rsikey); |
| if (!rsip) { |
| CERROR("error in rsi_lookup.\n"); |
| |
| if (!gss_pack_err_notify(req, GSS_S_FAILURE, 0)) |
| rc = SECSVC_COMPLETE; |
| |
| GOTO(out, rc); |
| } |
| |
| cache_get(&rsip->h); /* take an extra ref */ |
| init_waitqueue_head(&rsip->waitq); |
| init_waitqueue_entry_current(&wait); |
| add_wait_queue(&rsip->waitq, &wait); |
| |
| cache_check: |
| /* Note each time cache_check() will drop a reference if return |
| * non-zero. We hold an extra reference on initial rsip, but must |
| * take care of following calls. */ |
| rc = cache_check(&rsi_cache, &rsip->h, &cache_upcall_chandle); |
| switch (rc) { |
| case -EAGAIN: { |
| int valid; |
| |
| if (first_check) { |
| first_check = 0; |
| |
| read_lock(&rsi_cache.hash_lock); |
| valid = test_bit(CACHE_VALID, &rsip->h.flags); |
| if (valid == 0) |
| set_current_state(TASK_INTERRUPTIBLE); |
| read_unlock(&rsi_cache.hash_lock); |
| |
| if (valid == 0) |
| schedule_timeout(GSS_SVC_UPCALL_TIMEOUT * |
| HZ); |
| |
| cache_get(&rsip->h); |
| goto cache_check; |
| } |
| CWARN("waited %ds timeout, drop\n", GSS_SVC_UPCALL_TIMEOUT); |
| break; |
| } |
| case -ENOENT: |
| CWARN("cache_check return ENOENT, drop\n"); |
| break; |
| case 0: |
| /* if not the first check, we have to release the extra |
| * reference we just added on it. */ |
| if (!first_check) |
| cache_put(&rsip->h, &rsi_cache); |
| CDEBUG(D_SEC, "cache_check is good\n"); |
| break; |
| } |
| |
| remove_wait_queue(&rsip->waitq, &wait); |
| cache_put(&rsip->h, &rsi_cache); |
| |
| if (rc) |
| GOTO(out, rc = SECSVC_DROP); |
| |
| rc = SECSVC_DROP; |
| rsci = gss_svc_searchbyctx(&rsip->out_handle); |
| if (!rsci) { |
| CERROR("authentication failed\n"); |
| |
| if (!gss_pack_err_notify(req, GSS_S_FAILURE, 0)) |
| rc = SECSVC_COMPLETE; |
| |
| GOTO(out, rc); |
| } else { |
| cache_get(&rsci->h); |
| grctx->src_ctx = &rsci->ctx; |
| } |
| |
| if (rawobj_dup(&rsci->ctx.gsc_rvs_hdl, rvs_hdl)) { |
| CERROR("failed duplicate reverse handle\n"); |
| GOTO(out, rc); |
| } |
| |
| rsci->target = target; |
| |
| CDEBUG(D_SEC, "server create rsc %p(%u->%s)\n", |
| rsci, rsci->ctx.gsc_uid, libcfs_nid2str(req->rq_peer.nid)); |
| |
| if (rsip->out_handle.len > PTLRPC_GSS_MAX_HANDLE_SIZE) { |
| CERROR("handle size %u too large\n", rsip->out_handle.len); |
| GOTO(out, rc = SECSVC_DROP); |
| } |
| |
| grctx->src_init = 1; |
| grctx->src_reserve_len = cfs_size_round4(rsip->out_token.len); |
| |
| rc = lustre_pack_reply_v2(req, 1, &replen, NULL, 0); |
| if (rc) { |
| CERROR("failed to pack reply: %d\n", rc); |
| GOTO(out, rc = SECSVC_DROP); |
| } |
| |
| rs = req->rq_reply_state; |
| LASSERT(rs->rs_repbuf->lm_bufcount == 3); |
| LASSERT(rs->rs_repbuf->lm_buflens[0] >= |
| sizeof(*rephdr) + rsip->out_handle.len); |
| LASSERT(rs->rs_repbuf->lm_buflens[2] >= rsip->out_token.len); |
| |
| rephdr = lustre_msg_buf(rs->rs_repbuf, 0, 0); |
| rephdr->gh_version = PTLRPC_GSS_VERSION; |
| rephdr->gh_flags = 0; |
| rephdr->gh_proc = PTLRPC_GSS_PROC_ERR; |
| rephdr->gh_major = rsip->major_status; |
| rephdr->gh_minor = rsip->minor_status; |
| rephdr->gh_seqwin = GSS_SEQ_WIN; |
| rephdr->gh_handle.len = rsip->out_handle.len; |
| memcpy(rephdr->gh_handle.data, rsip->out_handle.data, |
| rsip->out_handle.len); |
| |
| memcpy(lustre_msg_buf(rs->rs_repbuf, 2, 0), rsip->out_token.data, |
| rsip->out_token.len); |
| |
| rs->rs_repdata_len = lustre_shrink_msg(rs->rs_repbuf, 2, |
| rsip->out_token.len, 0); |
| |
| rc = SECSVC_OK; |
| |
| out: |
| /* it looks like here we should put rsip also, but this mess up |
| * with NFS cache mgmt code... FIXME */ |
| #if 0 |
| if (rsip) |
| rsi_put(&rsip->h, &rsi_cache); |
| #endif |
| |
| if (rsci) { |
| /* if anything went wrong, we don't keep the context too */ |
| if (rc != SECSVC_OK) |
| set_bit(CACHE_NEGATIVE, &rsci->h.flags); |
| else |
| CDEBUG(D_SEC, "create rsc with idx "LPX64"\n", |
| gss_handle_to_u64(&rsci->handle)); |
| |
| COMPAT_RSC_PUT(&rsci->h, &rsc_cache); |
| } |
| RETURN(rc); |
| } |
| |
| struct gss_svc_ctx *gss_svc_upcall_get_ctx(struct ptlrpc_request *req, |
| struct gss_wire_ctx *gw) |
| { |
| struct rsc *rsc; |
| |
| rsc = gss_svc_searchbyctx(&gw->gw_handle); |
| if (!rsc) { |
| CWARN("Invalid gss ctx idx "LPX64" from %s\n", |
| gss_handle_to_u64(&gw->gw_handle), |
| libcfs_nid2str(req->rq_peer.nid)); |
| return NULL; |
| } |
| |
| return &rsc->ctx; |
| } |
| |
| void gss_svc_upcall_put_ctx(struct gss_svc_ctx *ctx) |
| { |
| struct rsc *rsc = container_of(ctx, struct rsc, ctx); |
| |
| COMPAT_RSC_PUT(&rsc->h, &rsc_cache); |
| } |
| |
| void gss_svc_upcall_destroy_ctx(struct gss_svc_ctx *ctx) |
| { |
| struct rsc *rsc = container_of(ctx, struct rsc, ctx); |
| |
| /* can't be found */ |
| set_bit(CACHE_NEGATIVE, &rsc->h.flags); |
| /* to be removed at next scan */ |
| rsc->h.expiry_time = 1; |
| } |
| |
| int __init gss_init_svc_upcall(void) |
| { |
| int i; |
| |
| spin_lock_init(&__ctx_index_lock); |
| /* |
| * this helps reducing context index confliction. after server reboot, |
| * conflicting request from clients might be filtered out by initial |
| * sequence number checking, thus no chance to sent error notification |
| * back to clients. |
| */ |
| cfs_get_random_bytes(&__ctx_index, sizeof(__ctx_index)); |
| |
| |
| cache_register(&rsi_cache); |
| cache_register(&rsc_cache); |
| |
| /* FIXME this looks stupid. we intend to give lsvcgssd a chance to open |
| * the init upcall channel, otherwise there's big chance that the first |
| * upcall issued before the channel be opened thus nfsv4 cache code will |
| * drop the request direclty, thus lead to unnecessary recovery time. |
| * here we wait at miximum 1.5 seconds. */ |
| for (i = 0; i < 6; i++) { |
| if (atomic_read(&rsi_cache.readers) > 0) |
| break; |
| set_current_state(TASK_UNINTERRUPTIBLE); |
| LASSERT(HZ >= 4); |
| schedule_timeout(HZ / 4); |
| } |
| |
| if (atomic_read(&rsi_cache.readers) == 0) |
| CWARN("Init channel is not opened by lsvcgssd, following " |
| "request might be dropped until lsvcgssd is active\n"); |
| |
| return 0; |
| } |
| |
| void __exit gss_exit_svc_upcall(void) |
| { |
| cache_purge(&rsi_cache); |
| cache_unregister(&rsi_cache); |
| |
| cache_purge(&rsc_cache); |
| cache_unregister(&rsc_cache); |
| } |