| /* |
| * fs/nfs4acl/acl.c |
| * |
| * Common NFSv4 ACL handling code. |
| * |
| * Copyright (c) 2002, 2003 The Regents of the University of Michigan. |
| * All rights reserved. |
| * |
| * Marius Aamodt Eriksen <marius@umich.edu> |
| * Jeff Sedlak <jsedlak@umich.edu> |
| * J. Bruce Fields <bfields@umich.edu> |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the University nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <linux/string.h> |
| #include <linux/slab.h> |
| #include <linux/list.h> |
| #include <linux/types.h> |
| #include <linux/fs.h> |
| #include <linux/module.h> |
| #include <linux/nfs_fs.h> |
| #include <linux/posix_acl.h> |
| #include <linux/nfs4.h> |
| #include <linux/nfs4_acl.h> |
| |
| |
| /* mode bit translations: */ |
| #define NFS4_READ_MODE (NFS4_ACE_READ_DATA) |
| #define NFS4_WRITE_MODE (NFS4_ACE_WRITE_DATA | NFS4_ACE_APPEND_DATA) |
| #define NFS4_EXECUTE_MODE NFS4_ACE_EXECUTE |
| #define NFS4_ANYONE_MODE (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL | NFS4_ACE_SYNCHRONIZE) |
| #define NFS4_OWNER_MODE (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL) |
| |
| /* We don't support these bits; insist they be neither allowed nor denied */ |
| #define NFS4_MASK_UNSUPP (NFS4_ACE_DELETE | NFS4_ACE_WRITE_OWNER \ |
| | NFS4_ACE_READ_NAMED_ATTRS | NFS4_ACE_WRITE_NAMED_ATTRS) |
| |
| /* flags used to simulate posix default ACLs */ |
| #define NFS4_INHERITANCE_FLAGS (NFS4_ACE_FILE_INHERIT_ACE \ |
| | NFS4_ACE_DIRECTORY_INHERIT_ACE | NFS4_ACE_INHERIT_ONLY_ACE) |
| |
| #define NFS4_SUPPORTED_FLAGS (NFS4_INHERITANCE_FLAGS | NFS4_ACE_IDENTIFIER_GROUP) |
| |
| #define MASK_EQUAL(mask1, mask2) \ |
| ( ((mask1) & NFS4_ACE_MASK_ALL) == ((mask2) & NFS4_ACE_MASK_ALL) ) |
| |
| static u32 |
| mask_from_posix(unsigned short perm, unsigned int flags) |
| { |
| int mask = NFS4_ANYONE_MODE; |
| |
| if (flags & NFS4_ACL_OWNER) |
| mask |= NFS4_OWNER_MODE; |
| if (perm & ACL_READ) |
| mask |= NFS4_READ_MODE; |
| if (perm & ACL_WRITE) |
| mask |= NFS4_WRITE_MODE; |
| if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR)) |
| mask |= NFS4_ACE_DELETE_CHILD; |
| if (perm & ACL_EXECUTE) |
| mask |= NFS4_EXECUTE_MODE; |
| return mask; |
| } |
| |
| static u32 |
| deny_mask(u32 allow_mask, unsigned int flags) |
| { |
| u32 ret = ~allow_mask & ~NFS4_MASK_UNSUPP; |
| if (!(flags & NFS4_ACL_DIR)) |
| ret &= ~NFS4_ACE_DELETE_CHILD; |
| return ret; |
| } |
| |
| /* XXX: modify functions to return NFS errors; they're only ever |
| * used by nfs code, after all.... */ |
| |
| /* We only map from NFSv4 to POSIX ACLs when setting ACLs, when we err on the |
| * side of being more restrictive, so the mode bit mapping below is |
| * pessimistic. An optimistic version would be needed to handle DENY's, |
| * but we espect to coalesce all ALLOWs and DENYs before mapping to mode |
| * bits. */ |
| |
| static void |
| low_mode_from_nfs4(u32 perm, unsigned short *mode, unsigned int flags) |
| { |
| u32 write_mode = NFS4_WRITE_MODE; |
| |
| if (flags & NFS4_ACL_DIR) |
| write_mode |= NFS4_ACE_DELETE_CHILD; |
| *mode = 0; |
| if ((perm & NFS4_READ_MODE) == NFS4_READ_MODE) |
| *mode |= ACL_READ; |
| if ((perm & write_mode) == write_mode) |
| *mode |= ACL_WRITE; |
| if ((perm & NFS4_EXECUTE_MODE) == NFS4_EXECUTE_MODE) |
| *mode |= ACL_EXECUTE; |
| } |
| |
| struct ace_container { |
| struct nfs4_ace *ace; |
| struct list_head ace_l; |
| }; |
| |
| static short ace2type(struct nfs4_ace *); |
| static int _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *, unsigned int); |
| static struct posix_acl *_nfsv4_to_posix_one(struct nfs4_acl *, unsigned int); |
| int nfs4_acl_add_ace(struct nfs4_acl *, u32, u32, u32, int, uid_t); |
| static int nfs4_acl_split(struct nfs4_acl *, struct nfs4_acl *); |
| |
| struct nfs4_acl * |
| nfs4_acl_posix_to_nfsv4(struct posix_acl *pacl, struct posix_acl *dpacl, |
| unsigned int flags) |
| { |
| struct nfs4_acl *acl; |
| int error = -EINVAL; |
| |
| if ((pacl != NULL && |
| (posix_acl_valid(pacl) < 0 || pacl->a_count == 0)) || |
| (dpacl != NULL && |
| (posix_acl_valid(dpacl) < 0 || dpacl->a_count == 0))) |
| goto out_err; |
| |
| acl = nfs4_acl_new(); |
| if (acl == NULL) { |
| error = -ENOMEM; |
| goto out_err; |
| } |
| |
| if (pacl != NULL) { |
| error = _posix_to_nfsv4_one(pacl, acl, |
| flags & ~NFS4_ACL_TYPE_DEFAULT); |
| if (error < 0) |
| goto out_acl; |
| } |
| |
| if (dpacl != NULL) { |
| error = _posix_to_nfsv4_one(dpacl, acl, |
| flags | NFS4_ACL_TYPE_DEFAULT); |
| if (error < 0) |
| goto out_acl; |
| } |
| |
| return acl; |
| |
| out_acl: |
| nfs4_acl_free(acl); |
| out_err: |
| acl = ERR_PTR(error); |
| |
| return acl; |
| } |
| |
| static int |
| nfs4_acl_add_pair(struct nfs4_acl *acl, int eflag, u32 mask, int whotype, |
| uid_t owner, unsigned int flags) |
| { |
| int error; |
| |
| error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE, |
| eflag, mask, whotype, owner); |
| if (error < 0) |
| return error; |
| error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE, |
| eflag, deny_mask(mask, flags), whotype, owner); |
| return error; |
| } |
| |
| /* We assume the acl has been verified with posix_acl_valid. */ |
| static int |
| _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl, |
| unsigned int flags) |
| { |
| struct posix_acl_entry *pa, *pe, *group_owner_entry; |
| int error = -EINVAL; |
| u32 mask, mask_mask; |
| int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ? |
| NFS4_INHERITANCE_FLAGS : 0); |
| |
| BUG_ON(pacl->a_count < 3); |
| pe = pacl->a_entries + pacl->a_count; |
| pa = pe - 2; /* if mask entry exists, it's second from the last. */ |
| if (pa->e_tag == ACL_MASK) |
| mask_mask = deny_mask(mask_from_posix(pa->e_perm, flags), flags); |
| else |
| mask_mask = 0; |
| |
| pa = pacl->a_entries; |
| BUG_ON(pa->e_tag != ACL_USER_OBJ); |
| mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER); |
| error = nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_OWNER, 0, flags); |
| if (error < 0) |
| goto out; |
| pa++; |
| |
| while (pa->e_tag == ACL_USER) { |
| mask = mask_from_posix(pa->e_perm, flags); |
| error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE, |
| eflag, mask_mask, NFS4_ACL_WHO_NAMED, pa->e_id); |
| if (error < 0) |
| goto out; |
| |
| |
| error = nfs4_acl_add_pair(acl, eflag, mask, |
| NFS4_ACL_WHO_NAMED, pa->e_id, flags); |
| if (error < 0) |
| goto out; |
| pa++; |
| } |
| |
| /* In the case of groups, we apply allow ACEs first, then deny ACEs, |
| * since a user can be in more than one group. */ |
| |
| /* allow ACEs */ |
| |
| if (pacl->a_count > 3) { |
| BUG_ON(pa->e_tag != ACL_GROUP_OBJ); |
| error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE, |
| NFS4_ACE_IDENTIFIER_GROUP | eflag, mask_mask, |
| NFS4_ACL_WHO_GROUP, 0); |
| if (error < 0) |
| goto out; |
| } |
| group_owner_entry = pa; |
| mask = mask_from_posix(pa->e_perm, flags); |
| error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE, |
| NFS4_ACE_IDENTIFIER_GROUP | eflag, mask, |
| NFS4_ACL_WHO_GROUP, 0); |
| if (error < 0) |
| goto out; |
| pa++; |
| |
| while (pa->e_tag == ACL_GROUP) { |
| mask = mask_from_posix(pa->e_perm, flags); |
| error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE, |
| NFS4_ACE_IDENTIFIER_GROUP | eflag, mask_mask, |
| NFS4_ACL_WHO_NAMED, pa->e_id); |
| if (error < 0) |
| goto out; |
| |
| error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE, |
| NFS4_ACE_IDENTIFIER_GROUP | eflag, mask, |
| NFS4_ACL_WHO_NAMED, pa->e_id); |
| if (error < 0) |
| goto out; |
| pa++; |
| } |
| |
| /* deny ACEs */ |
| |
| pa = group_owner_entry; |
| mask = mask_from_posix(pa->e_perm, flags); |
| error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE, |
| NFS4_ACE_IDENTIFIER_GROUP | eflag, |
| deny_mask(mask, flags), NFS4_ACL_WHO_GROUP, 0); |
| if (error < 0) |
| goto out; |
| pa++; |
| while (pa->e_tag == ACL_GROUP) { |
| mask = mask_from_posix(pa->e_perm, flags); |
| error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE, |
| NFS4_ACE_IDENTIFIER_GROUP | eflag, |
| deny_mask(mask, flags), NFS4_ACL_WHO_NAMED, pa->e_id); |
| if (error < 0) |
| goto out; |
| pa++; |
| } |
| |
| if (pa->e_tag == ACL_MASK) |
| pa++; |
| BUG_ON(pa->e_tag != ACL_OTHER); |
| mask = mask_from_posix(pa->e_perm, flags); |
| error = nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_EVERYONE, 0, flags); |
| |
| out: |
| return error; |
| } |
| |
| static void |
| sort_pacl_range(struct posix_acl *pacl, int start, int end) { |
| int sorted = 0, i; |
| struct posix_acl_entry tmp; |
| |
| /* We just do a bubble sort; easy to do in place, and we're not |
| * expecting acl's to be long enough to justify anything more. */ |
| while (!sorted) { |
| sorted = 1; |
| for (i = start; i < end; i++) { |
| if (pacl->a_entries[i].e_id |
| > pacl->a_entries[i+1].e_id) { |
| sorted = 0; |
| tmp = pacl->a_entries[i]; |
| pacl->a_entries[i] = pacl->a_entries[i+1]; |
| pacl->a_entries[i+1] = tmp; |
| } |
| } |
| } |
| } |
| |
| static void |
| sort_pacl(struct posix_acl *pacl) |
| { |
| /* posix_acl_valid requires that users and groups be in order |
| * by uid/gid. */ |
| int i, j; |
| |
| if (pacl->a_count <= 4) |
| return; /* no users or groups */ |
| i = 1; |
| while (pacl->a_entries[i].e_tag == ACL_USER) |
| i++; |
| sort_pacl_range(pacl, 1, i-1); |
| |
| BUG_ON(pacl->a_entries[i].e_tag != ACL_GROUP_OBJ); |
| j = i++; |
| while (pacl->a_entries[j].e_tag == ACL_GROUP) |
| j++; |
| sort_pacl_range(pacl, i, j-1); |
| return; |
| } |
| |
| int |
| nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl, struct posix_acl **pacl, |
| struct posix_acl **dpacl, unsigned int flags) |
| { |
| struct nfs4_acl *dacl; |
| int error = -ENOMEM; |
| |
| *pacl = NULL; |
| *dpacl = NULL; |
| |
| dacl = nfs4_acl_new(); |
| if (dacl == NULL) |
| goto out; |
| |
| error = nfs4_acl_split(acl, dacl); |
| if (error < 0) |
| goto out_acl; |
| |
| if (acl->naces == 0) { |
| error = -ENODATA; |
| goto try_dpacl; |
| } |
| |
| *pacl = _nfsv4_to_posix_one(acl, flags); |
| if (IS_ERR(*pacl)) { |
| error = PTR_ERR(*pacl); |
| *pacl = NULL; |
| goto out_acl; |
| } |
| try_dpacl: |
| if (dacl->naces == 0) { |
| if (pacl == NULL || *pacl == NULL) |
| error = -ENODATA; |
| goto out_acl; |
| } |
| |
| error = 0; |
| *dpacl = _nfsv4_to_posix_one(dacl, flags); |
| if (IS_ERR(*dpacl)) { |
| error = PTR_ERR(*dpacl); |
| *dpacl = NULL; |
| goto out_acl; |
| } |
| out_acl: |
| if (error) { |
| posix_acl_release(*pacl); |
| *pacl = NULL; |
| } |
| nfs4_acl_free(dacl); |
| out: |
| return error; |
| } |
| |
| /* |
| * While processing the NFSv4 ACE, this maintains bitmasks representing |
| * which permission bits have been allowed and which denied to a given |
| * entity: */ |
| struct posix_ace_state { |
| u32 allow; |
| u32 deny; |
| }; |
| |
| struct posix_user_ace_state { |
| uid_t uid; |
| struct posix_ace_state perms; |
| }; |
| |
| struct posix_ace_state_array { |
| int n; |
| struct posix_user_ace_state aces[]; |
| }; |
| |
| /* |
| * While processing the NFSv4 ACE, this maintains the partial permissions |
| * calculated so far: */ |
| |
| struct posix_acl_state { |
| struct posix_ace_state owner; |
| struct posix_ace_state group; |
| struct posix_ace_state other; |
| struct posix_ace_state everyone; |
| struct posix_ace_state mask; /* Deny unused in this case */ |
| struct posix_ace_state_array *users; |
| struct posix_ace_state_array *groups; |
| }; |
| |
| static int |
| init_state(struct posix_acl_state *state, int cnt) |
| { |
| int alloc; |
| |
| memset(state, 0, sizeof(struct posix_acl_state)); |
| /* |
| * In the worst case, each individual acl could be for a distinct |
| * named user or group, but we don't no which, so we allocate |
| * enough space for either: |
| */ |
| alloc = sizeof(struct posix_ace_state_array) |
| + cnt*sizeof(struct posix_ace_state); |
| state->users = kzalloc(alloc, GFP_KERNEL); |
| if (!state->users) |
| return -ENOMEM; |
| state->groups = kzalloc(alloc, GFP_KERNEL); |
| if (!state->groups) { |
| kfree(state->users); |
| return -ENOMEM; |
| } |
| return 0; |
| } |
| |
| static void |
| free_state(struct posix_acl_state *state) { |
| kfree(state->users); |
| kfree(state->groups); |
| } |
| |
| static inline void add_to_mask(struct posix_acl_state *state, struct posix_ace_state *astate) |
| { |
| state->mask.allow |= astate->allow; |
| } |
| |
| /* |
| * Certain bits (SYNCHRONIZE, DELETE, WRITE_OWNER, READ/WRITE_NAMED_ATTRS, |
| * READ_ATTRIBUTES, READ_ACL) are currently unenforceable and don't translate |
| * to traditional read/write/execute permissions. |
| * |
| * It's problematic to reject acls that use certain mode bits, because it |
| * places the burden on users to learn the rules about which bits one |
| * particular server sets, without giving the user a lot of help--we return an |
| * error that could mean any number of different things. To make matters |
| * worse, the problematic bits might be introduced by some application that's |
| * automatically mapping from some other acl model. |
| * |
| * So wherever possible we accept anything, possibly erring on the side of |
| * denying more permissions than necessary. |
| * |
| * However we do reject *explicit* DENY's of a few bits representing |
| * permissions we could never deny: |
| */ |
| |
| static inline int check_deny(u32 mask, int isowner) |
| { |
| if (mask & (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL)) |
| return -EINVAL; |
| if (!isowner) |
| return 0; |
| if (mask & (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL)) |
| return -EINVAL; |
| return 0; |
| } |
| |
| static struct posix_acl * |
| posix_state_to_acl(struct posix_acl_state *state, unsigned int flags) |
| { |
| struct posix_acl_entry *pace; |
| struct posix_acl *pacl; |
| int nace; |
| int i, error = 0; |
| |
| nace = 4 + state->users->n + state->groups->n; |
| pacl = posix_acl_alloc(nace, GFP_KERNEL); |
| if (!pacl) |
| return ERR_PTR(-ENOMEM); |
| |
| pace = pacl->a_entries; |
| pace->e_tag = ACL_USER_OBJ; |
| error = check_deny(state->owner.deny, 1); |
| if (error) |
| goto out_err; |
| low_mode_from_nfs4(state->owner.allow, &pace->e_perm, flags); |
| pace->e_id = ACL_UNDEFINED_ID; |
| |
| for (i=0; i < state->users->n; i++) { |
| pace++; |
| pace->e_tag = ACL_USER; |
| error = check_deny(state->users->aces[i].perms.deny, 0); |
| if (error) |
| goto out_err; |
| low_mode_from_nfs4(state->users->aces[i].perms.allow, |
| &pace->e_perm, flags); |
| pace->e_id = state->users->aces[i].uid; |
| add_to_mask(state, &state->users->aces[i].perms); |
| } |
| |
| pace++; |
| pace->e_tag = ACL_GROUP_OBJ; |
| error = check_deny(state->group.deny, 0); |
| if (error) |
| goto out_err; |
| low_mode_from_nfs4(state->group.allow, &pace->e_perm, flags); |
| pace->e_id = ACL_UNDEFINED_ID; |
| add_to_mask(state, &state->group); |
| |
| for (i=0; i < state->groups->n; i++) { |
| pace++; |
| pace->e_tag = ACL_GROUP; |
| error = check_deny(state->groups->aces[i].perms.deny, 0); |
| if (error) |
| goto out_err; |
| low_mode_from_nfs4(state->groups->aces[i].perms.allow, |
| &pace->e_perm, flags); |
| pace->e_id = state->groups->aces[i].uid; |
| add_to_mask(state, &state->groups->aces[i].perms); |
| } |
| |
| pace++; |
| pace->e_tag = ACL_MASK; |
| low_mode_from_nfs4(state->mask.allow, &pace->e_perm, flags); |
| pace->e_id = ACL_UNDEFINED_ID; |
| |
| pace++; |
| pace->e_tag = ACL_OTHER; |
| error = check_deny(state->other.deny, 0); |
| if (error) |
| goto out_err; |
| low_mode_from_nfs4(state->other.allow, &pace->e_perm, flags); |
| pace->e_id = ACL_UNDEFINED_ID; |
| |
| return pacl; |
| out_err: |
| posix_acl_release(pacl); |
| return ERR_PTR(error); |
| } |
| |
| static inline void allow_bits(struct posix_ace_state *astate, u32 mask) |
| { |
| /* Allow all bits in the mask not already denied: */ |
| astate->allow |= mask & ~astate->deny; |
| } |
| |
| static inline void deny_bits(struct posix_ace_state *astate, u32 mask) |
| { |
| /* Deny all bits in the mask not already allowed: */ |
| astate->deny |= mask & ~astate->allow; |
| } |
| |
| static int find_uid(struct posix_acl_state *state, struct posix_ace_state_array *a, uid_t uid) |
| { |
| int i; |
| |
| for (i = 0; i < a->n; i++) |
| if (a->aces[i].uid == uid) |
| return i; |
| /* Not found: */ |
| a->n++; |
| a->aces[i].uid = uid; |
| a->aces[i].perms.allow = state->everyone.allow; |
| a->aces[i].perms.deny = state->everyone.deny; |
| |
| return i; |
| } |
| |
| static void deny_bits_array(struct posix_ace_state_array *a, u32 mask) |
| { |
| int i; |
| |
| for (i=0; i < a->n; i++) |
| deny_bits(&a->aces[i].perms, mask); |
| } |
| |
| static void allow_bits_array(struct posix_ace_state_array *a, u32 mask) |
| { |
| int i; |
| |
| for (i=0; i < a->n; i++) |
| allow_bits(&a->aces[i].perms, mask); |
| } |
| |
| static void process_one_v4_ace(struct posix_acl_state *state, |
| struct nfs4_ace *ace) |
| { |
| u32 mask = ace->access_mask; |
| int i; |
| |
| switch (ace2type(ace)) { |
| case ACL_USER_OBJ: |
| if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { |
| allow_bits(&state->owner, mask); |
| } else { |
| deny_bits(&state->owner, mask); |
| } |
| break; |
| case ACL_USER: |
| i = find_uid(state, state->users, ace->who); |
| if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { |
| allow_bits(&state->users->aces[i].perms, mask); |
| } else { |
| deny_bits(&state->users->aces[i].perms, mask); |
| mask = state->users->aces[i].perms.deny; |
| deny_bits(&state->owner, mask); |
| } |
| break; |
| case ACL_GROUP_OBJ: |
| if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { |
| allow_bits(&state->group, mask); |
| } else { |
| deny_bits(&state->group, mask); |
| mask = state->group.deny; |
| deny_bits(&state->owner, mask); |
| deny_bits(&state->everyone, mask); |
| deny_bits_array(state->users, mask); |
| deny_bits_array(state->groups, mask); |
| } |
| break; |
| case ACL_GROUP: |
| i = find_uid(state, state->groups, ace->who); |
| if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { |
| allow_bits(&state->groups->aces[i].perms, mask); |
| } else { |
| deny_bits(&state->groups->aces[i].perms, mask); |
| mask = state->groups->aces[i].perms.deny; |
| deny_bits(&state->owner, mask); |
| deny_bits(&state->group, mask); |
| deny_bits(&state->everyone, mask); |
| deny_bits_array(state->users, mask); |
| deny_bits_array(state->groups, mask); |
| } |
| break; |
| case ACL_OTHER: |
| if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { |
| allow_bits(&state->owner, mask); |
| allow_bits(&state->group, mask); |
| allow_bits(&state->other, mask); |
| allow_bits(&state->everyone, mask); |
| allow_bits_array(state->users, mask); |
| allow_bits_array(state->groups, mask); |
| } else { |
| deny_bits(&state->owner, mask); |
| deny_bits(&state->group, mask); |
| deny_bits(&state->other, mask); |
| deny_bits(&state->everyone, mask); |
| deny_bits_array(state->users, mask); |
| deny_bits_array(state->groups, mask); |
| } |
| } |
| } |
| |
| static struct posix_acl * |
| _nfsv4_to_posix_one(struct nfs4_acl *n4acl, unsigned int flags) |
| { |
| struct posix_acl_state state; |
| struct posix_acl *pacl; |
| struct nfs4_ace *ace; |
| int ret; |
| |
| ret = init_state(&state, n4acl->naces); |
| if (ret) |
| return ERR_PTR(ret); |
| |
| list_for_each_entry(ace, &n4acl->ace_head, l_ace) |
| process_one_v4_ace(&state, ace); |
| |
| pacl = posix_state_to_acl(&state, flags); |
| |
| free_state(&state); |
| |
| if (!IS_ERR(pacl)) |
| sort_pacl(pacl); |
| return pacl; |
| } |
| |
| static int |
| nfs4_acl_split(struct nfs4_acl *acl, struct nfs4_acl *dacl) |
| { |
| struct list_head *h, *n; |
| struct nfs4_ace *ace; |
| int error = 0; |
| |
| list_for_each_safe(h, n, &acl->ace_head) { |
| ace = list_entry(h, struct nfs4_ace, l_ace); |
| |
| if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE && |
| ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE) |
| return -EINVAL; |
| |
| if (ace->flag & ~NFS4_SUPPORTED_FLAGS) |
| return -EINVAL; |
| |
| switch (ace->flag & NFS4_INHERITANCE_FLAGS) { |
| case 0: |
| /* Leave this ace in the effective acl: */ |
| continue; |
| case NFS4_INHERITANCE_FLAGS: |
| /* Add this ace to the default acl and remove it |
| * from the effective acl: */ |
| error = nfs4_acl_add_ace(dacl, ace->type, ace->flag, |
| ace->access_mask, ace->whotype, ace->who); |
| if (error) |
| return error; |
| list_del(h); |
| kfree(ace); |
| acl->naces--; |
| break; |
| case NFS4_INHERITANCE_FLAGS & ~NFS4_ACE_INHERIT_ONLY_ACE: |
| /* Add this ace to the default, but leave it in |
| * the effective acl as well: */ |
| error = nfs4_acl_add_ace(dacl, ace->type, ace->flag, |
| ace->access_mask, ace->whotype, ace->who); |
| if (error) |
| return error; |
| break; |
| default: |
| return -EINVAL; |
| } |
| } |
| return 0; |
| } |
| |
| static short |
| ace2type(struct nfs4_ace *ace) |
| { |
| switch (ace->whotype) { |
| case NFS4_ACL_WHO_NAMED: |
| return (ace->flag & NFS4_ACE_IDENTIFIER_GROUP ? |
| ACL_GROUP : ACL_USER); |
| case NFS4_ACL_WHO_OWNER: |
| return ACL_USER_OBJ; |
| case NFS4_ACL_WHO_GROUP: |
| return ACL_GROUP_OBJ; |
| case NFS4_ACL_WHO_EVERYONE: |
| return ACL_OTHER; |
| } |
| BUG(); |
| return -1; |
| } |
| |
| EXPORT_SYMBOL(nfs4_acl_posix_to_nfsv4); |
| EXPORT_SYMBOL(nfs4_acl_nfsv4_to_posix); |
| |
| struct nfs4_acl * |
| nfs4_acl_new(void) |
| { |
| struct nfs4_acl *acl; |
| |
| if ((acl = kmalloc(sizeof(*acl), GFP_KERNEL)) == NULL) |
| return NULL; |
| |
| acl->naces = 0; |
| INIT_LIST_HEAD(&acl->ace_head); |
| |
| return acl; |
| } |
| |
| void |
| nfs4_acl_free(struct nfs4_acl *acl) |
| { |
| struct list_head *h; |
| struct nfs4_ace *ace; |
| |
| if (!acl) |
| return; |
| |
| while (!list_empty(&acl->ace_head)) { |
| h = acl->ace_head.next; |
| list_del(h); |
| ace = list_entry(h, struct nfs4_ace, l_ace); |
| kfree(ace); |
| } |
| |
| kfree(acl); |
| |
| return; |
| } |
| |
| int |
| nfs4_acl_add_ace(struct nfs4_acl *acl, u32 type, u32 flag, u32 access_mask, |
| int whotype, uid_t who) |
| { |
| struct nfs4_ace *ace; |
| |
| if ((ace = kmalloc(sizeof(*ace), GFP_KERNEL)) == NULL) |
| return -ENOMEM; |
| |
| ace->type = type; |
| ace->flag = flag; |
| ace->access_mask = access_mask; |
| ace->whotype = whotype; |
| ace->who = who; |
| |
| list_add_tail(&ace->l_ace, &acl->ace_head); |
| acl->naces++; |
| |
| return 0; |
| } |
| |
| static struct { |
| char *string; |
| int stringlen; |
| int type; |
| } s2t_map[] = { |
| { |
| .string = "OWNER@", |
| .stringlen = sizeof("OWNER@") - 1, |
| .type = NFS4_ACL_WHO_OWNER, |
| }, |
| { |
| .string = "GROUP@", |
| .stringlen = sizeof("GROUP@") - 1, |
| .type = NFS4_ACL_WHO_GROUP, |
| }, |
| { |
| .string = "EVERYONE@", |
| .stringlen = sizeof("EVERYONE@") - 1, |
| .type = NFS4_ACL_WHO_EVERYONE, |
| }, |
| }; |
| |
| int |
| nfs4_acl_get_whotype(char *p, u32 len) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(s2t_map); i++) { |
| if (s2t_map[i].stringlen == len && |
| 0 == memcmp(s2t_map[i].string, p, len)) |
| return s2t_map[i].type; |
| } |
| return NFS4_ACL_WHO_NAMED; |
| } |
| |
| int |
| nfs4_acl_write_who(int who, char *p) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(s2t_map); i++) { |
| if (s2t_map[i].type == who) { |
| memcpy(p, s2t_map[i].string, s2t_map[i].stringlen); |
| return s2t_map[i].stringlen; |
| } |
| } |
| BUG(); |
| return -1; |
| } |
| |
| EXPORT_SYMBOL(nfs4_acl_new); |
| EXPORT_SYMBOL(nfs4_acl_free); |
| EXPORT_SYMBOL(nfs4_acl_add_ace); |
| EXPORT_SYMBOL(nfs4_acl_get_whotype); |
| EXPORT_SYMBOL(nfs4_acl_write_who); |