| /* |
| * fs/cifs/cifsacl.c |
| * |
| * Copyright (C) International Business Machines Corp., 2007,2008 |
| * Author(s): Steve French (sfrench@us.ibm.com) |
| * |
| * Contains the routines for mapping CIFS/NTFS ACLs |
| * |
| * This library is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Lesser General Public License as published |
| * by the Free Software Foundation; either version 2.1 of the License, or |
| * (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| * the GNU Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public License |
| * along with this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include <linux/fs.h> |
| #include <linux/slab.h> |
| #include <linux/string.h> |
| #include <linux/keyctl.h> |
| #include <linux/key-type.h> |
| #include <keys/user-type.h> |
| #include "cifspdu.h" |
| #include "cifsglob.h" |
| #include "cifsacl.h" |
| #include "cifsproto.h" |
| #include "cifs_debug.h" |
| |
| /* security id for everyone/world system group */ |
| static const struct cifs_sid sid_everyone = { |
| 1, 1, {0, 0, 0, 0, 0, 1}, {0} }; |
| /* security id for Authenticated Users system group */ |
| static const struct cifs_sid sid_authusers = { |
| 1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(11)} }; |
| |
| /* S-1-22-1 Unmapped Unix users */ |
| static const struct cifs_sid sid_unix_users = {1, 1, {0, 0, 0, 0, 0, 22}, |
| {cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; |
| |
| /* S-1-22-2 Unmapped Unix groups */ |
| static const struct cifs_sid sid_unix_groups = { 1, 1, {0, 0, 0, 0, 0, 22}, |
| {cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; |
| |
| /* |
| * See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx |
| */ |
| |
| /* S-1-5-88 MS NFS and Apple style UID/GID/mode */ |
| |
| /* S-1-5-88-1 Unix uid */ |
| static const struct cifs_sid sid_unix_NFS_users = { 1, 2, {0, 0, 0, 0, 0, 5}, |
| {cpu_to_le32(88), |
| cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; |
| |
| /* S-1-5-88-2 Unix gid */ |
| static const struct cifs_sid sid_unix_NFS_groups = { 1, 2, {0, 0, 0, 0, 0, 5}, |
| {cpu_to_le32(88), |
| cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; |
| |
| /* S-1-5-88-3 Unix mode */ |
| static const struct cifs_sid sid_unix_NFS_mode = { 1, 2, {0, 0, 0, 0, 0, 5}, |
| {cpu_to_le32(88), |
| cpu_to_le32(3), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; |
| |
| static const struct cred *root_cred; |
| |
| static int |
| cifs_idmap_key_instantiate(struct key *key, struct key_preparsed_payload *prep) |
| { |
| char *payload; |
| |
| /* |
| * If the payload is less than or equal to the size of a pointer, then |
| * an allocation here is wasteful. Just copy the data directly to the |
| * payload.value union member instead. |
| * |
| * With this however, you must check the datalen before trying to |
| * dereference payload.data! |
| */ |
| if (prep->datalen <= sizeof(key->payload)) { |
| key->payload.data[0] = NULL; |
| memcpy(&key->payload, prep->data, prep->datalen); |
| } else { |
| payload = kmemdup(prep->data, prep->datalen, GFP_KERNEL); |
| if (!payload) |
| return -ENOMEM; |
| key->payload.data[0] = payload; |
| } |
| |
| key->datalen = prep->datalen; |
| return 0; |
| } |
| |
| static inline void |
| cifs_idmap_key_destroy(struct key *key) |
| { |
| if (key->datalen > sizeof(key->payload)) |
| kfree(key->payload.data[0]); |
| } |
| |
| static struct key_type cifs_idmap_key_type = { |
| .name = "cifs.idmap", |
| .instantiate = cifs_idmap_key_instantiate, |
| .destroy = cifs_idmap_key_destroy, |
| .describe = user_describe, |
| }; |
| |
| static char * |
| sid_to_key_str(struct cifs_sid *sidptr, unsigned int type) |
| { |
| int i, len; |
| unsigned int saval; |
| char *sidstr, *strptr; |
| unsigned long long id_auth_val; |
| |
| /* 3 bytes for prefix */ |
| sidstr = kmalloc(3 + SID_STRING_BASE_SIZE + |
| (SID_STRING_SUBAUTH_SIZE * sidptr->num_subauth), |
| GFP_KERNEL); |
| if (!sidstr) |
| return sidstr; |
| |
| strptr = sidstr; |
| len = sprintf(strptr, "%cs:S-%hhu", type == SIDOWNER ? 'o' : 'g', |
| sidptr->revision); |
| strptr += len; |
| |
| /* The authority field is a single 48-bit number */ |
| id_auth_val = (unsigned long long)sidptr->authority[5]; |
| id_auth_val |= (unsigned long long)sidptr->authority[4] << 8; |
| id_auth_val |= (unsigned long long)sidptr->authority[3] << 16; |
| id_auth_val |= (unsigned long long)sidptr->authority[2] << 24; |
| id_auth_val |= (unsigned long long)sidptr->authority[1] << 32; |
| id_auth_val |= (unsigned long long)sidptr->authority[0] << 48; |
| |
| /* |
| * MS-DTYP states that if the authority is >= 2^32, then it should be |
| * expressed as a hex value. |
| */ |
| if (id_auth_val <= UINT_MAX) |
| len = sprintf(strptr, "-%llu", id_auth_val); |
| else |
| len = sprintf(strptr, "-0x%llx", id_auth_val); |
| |
| strptr += len; |
| |
| for (i = 0; i < sidptr->num_subauth; ++i) { |
| saval = le32_to_cpu(sidptr->sub_auth[i]); |
| len = sprintf(strptr, "-%u", saval); |
| strptr += len; |
| } |
| |
| return sidstr; |
| } |
| |
| /* |
| * if the two SIDs (roughly equivalent to a UUID for a user or group) are |
| * the same returns zero, if they do not match returns non-zero. |
| */ |
| static int |
| compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid) |
| { |
| int i; |
| int num_subauth, num_sat, num_saw; |
| |
| if ((!ctsid) || (!cwsid)) |
| return 1; |
| |
| /* compare the revision */ |
| if (ctsid->revision != cwsid->revision) { |
| if (ctsid->revision > cwsid->revision) |
| return 1; |
| else |
| return -1; |
| } |
| |
| /* compare all of the six auth values */ |
| for (i = 0; i < NUM_AUTHS; ++i) { |
| if (ctsid->authority[i] != cwsid->authority[i]) { |
| if (ctsid->authority[i] > cwsid->authority[i]) |
| return 1; |
| else |
| return -1; |
| } |
| } |
| |
| /* compare all of the subauth values if any */ |
| num_sat = ctsid->num_subauth; |
| num_saw = cwsid->num_subauth; |
| num_subauth = num_sat < num_saw ? num_sat : num_saw; |
| if (num_subauth) { |
| for (i = 0; i < num_subauth; ++i) { |
| if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) { |
| if (le32_to_cpu(ctsid->sub_auth[i]) > |
| le32_to_cpu(cwsid->sub_auth[i])) |
| return 1; |
| else |
| return -1; |
| } |
| } |
| } |
| |
| return 0; /* sids compare/match */ |
| } |
| |
| static bool |
| is_well_known_sid(const struct cifs_sid *psid, uint32_t *puid, bool is_group) |
| { |
| int i; |
| int num_subauth; |
| const struct cifs_sid *pwell_known_sid; |
| |
| if (!psid || (puid == NULL)) |
| return false; |
| |
| num_subauth = psid->num_subauth; |
| |
| /* check if Mac (or Windows NFS) vs. Samba format for Unix owner SID */ |
| if (num_subauth == 2) { |
| if (is_group) |
| pwell_known_sid = &sid_unix_groups; |
| else |
| pwell_known_sid = &sid_unix_users; |
| } else if (num_subauth == 3) { |
| if (is_group) |
| pwell_known_sid = &sid_unix_NFS_groups; |
| else |
| pwell_known_sid = &sid_unix_NFS_users; |
| } else |
| return false; |
| |
| /* compare the revision */ |
| if (psid->revision != pwell_known_sid->revision) |
| return false; |
| |
| /* compare all of the six auth values */ |
| for (i = 0; i < NUM_AUTHS; ++i) { |
| if (psid->authority[i] != pwell_known_sid->authority[i]) { |
| cifs_dbg(FYI, "auth %d did not match\n", i); |
| return false; |
| } |
| } |
| |
| if (num_subauth == 2) { |
| if (psid->sub_auth[0] != pwell_known_sid->sub_auth[0]) |
| return false; |
| |
| *puid = le32_to_cpu(psid->sub_auth[1]); |
| } else /* 3 subauths, ie Windows/Mac style */ { |
| *puid = le32_to_cpu(psid->sub_auth[0]); |
| if ((psid->sub_auth[0] != pwell_known_sid->sub_auth[0]) || |
| (psid->sub_auth[1] != pwell_known_sid->sub_auth[1])) |
| return false; |
| |
| *puid = le32_to_cpu(psid->sub_auth[2]); |
| } |
| |
| cifs_dbg(FYI, "Unix UID %d returned from SID\n", *puid); |
| return true; /* well known sid found, uid returned */ |
| } |
| |
| static void |
| cifs_copy_sid(struct cifs_sid *dst, const struct cifs_sid *src) |
| { |
| int i; |
| |
| dst->revision = src->revision; |
| dst->num_subauth = min_t(u8, src->num_subauth, SID_MAX_SUB_AUTHORITIES); |
| for (i = 0; i < NUM_AUTHS; ++i) |
| dst->authority[i] = src->authority[i]; |
| for (i = 0; i < dst->num_subauth; ++i) |
| dst->sub_auth[i] = src->sub_auth[i]; |
| } |
| |
| static int |
| id_to_sid(unsigned int cid, uint sidtype, struct cifs_sid *ssid) |
| { |
| int rc; |
| struct key *sidkey; |
| struct cifs_sid *ksid; |
| unsigned int ksid_size; |
| char desc[3 + 10 + 1]; /* 3 byte prefix + 10 bytes for value + NULL */ |
| const struct cred *saved_cred; |
| |
| rc = snprintf(desc, sizeof(desc), "%ci:%u", |
| sidtype == SIDOWNER ? 'o' : 'g', cid); |
| if (rc >= sizeof(desc)) |
| return -EINVAL; |
| |
| rc = 0; |
| saved_cred = override_creds(root_cred); |
| sidkey = request_key(&cifs_idmap_key_type, desc, ""); |
| if (IS_ERR(sidkey)) { |
| rc = -EINVAL; |
| cifs_dbg(FYI, "%s: Can't map %cid %u to a SID\n", |
| __func__, sidtype == SIDOWNER ? 'u' : 'g', cid); |
| goto out_revert_creds; |
| } else if (sidkey->datalen < CIFS_SID_BASE_SIZE) { |
| rc = -EIO; |
| cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu)\n", |
| __func__, sidkey->datalen); |
| goto invalidate_key; |
| } |
| |
| /* |
| * A sid is usually too large to be embedded in payload.value, but if |
| * there are no subauthorities and the host has 8-byte pointers, then |
| * it could be. |
| */ |
| ksid = sidkey->datalen <= sizeof(sidkey->payload) ? |
| (struct cifs_sid *)&sidkey->payload : |
| (struct cifs_sid *)sidkey->payload.data[0]; |
| |
| ksid_size = CIFS_SID_BASE_SIZE + (ksid->num_subauth * sizeof(__le32)); |
| if (ksid_size > sidkey->datalen) { |
| rc = -EIO; |
| cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu, ksid_size=%u)\n", |
| __func__, sidkey->datalen, ksid_size); |
| goto invalidate_key; |
| } |
| |
| cifs_copy_sid(ssid, ksid); |
| out_key_put: |
| key_put(sidkey); |
| out_revert_creds: |
| revert_creds(saved_cred); |
| return rc; |
| |
| invalidate_key: |
| key_invalidate(sidkey); |
| goto out_key_put; |
| } |
| |
| static int |
| sid_to_id(struct cifs_sb_info *cifs_sb, struct cifs_sid *psid, |
| struct cifs_fattr *fattr, uint sidtype) |
| { |
| int rc = 0; |
| struct key *sidkey; |
| char *sidstr; |
| const struct cred *saved_cred; |
| kuid_t fuid = cifs_sb->mnt_uid; |
| kgid_t fgid = cifs_sb->mnt_gid; |
| |
| /* |
| * If we have too many subauthorities, then something is really wrong. |
| * Just return an error. |
| */ |
| if (unlikely(psid->num_subauth > SID_MAX_SUB_AUTHORITIES)) { |
| cifs_dbg(FYI, "%s: %u subauthorities is too many!\n", |
| __func__, psid->num_subauth); |
| return -EIO; |
| } |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL) { |
| uint32_t unix_id; |
| bool is_group; |
| |
| if (sidtype != SIDOWNER) |
| is_group = true; |
| else |
| is_group = false; |
| |
| if (is_well_known_sid(psid, &unix_id, is_group) == false) |
| goto try_upcall_to_get_id; |
| |
| if (is_group) { |
| kgid_t gid; |
| gid_t id; |
| |
| id = (gid_t)unix_id; |
| gid = make_kgid(&init_user_ns, id); |
| if (gid_valid(gid)) { |
| fgid = gid; |
| goto got_valid_id; |
| } |
| } else { |
| kuid_t uid; |
| uid_t id; |
| |
| id = (uid_t)unix_id; |
| uid = make_kuid(&init_user_ns, id); |
| if (uid_valid(uid)) { |
| fuid = uid; |
| goto got_valid_id; |
| } |
| } |
| /* If unable to find uid/gid easily from SID try via upcall */ |
| } |
| |
| try_upcall_to_get_id: |
| sidstr = sid_to_key_str(psid, sidtype); |
| if (!sidstr) |
| return -ENOMEM; |
| |
| saved_cred = override_creds(root_cred); |
| sidkey = request_key(&cifs_idmap_key_type, sidstr, ""); |
| if (IS_ERR(sidkey)) { |
| rc = -EINVAL; |
| cifs_dbg(FYI, "%s: Can't map SID %s to a %cid\n", |
| __func__, sidstr, sidtype == SIDOWNER ? 'u' : 'g'); |
| goto out_revert_creds; |
| } |
| |
| /* |
| * FIXME: Here we assume that uid_t and gid_t are same size. It's |
| * probably a safe assumption but might be better to check based on |
| * sidtype. |
| */ |
| BUILD_BUG_ON(sizeof(uid_t) != sizeof(gid_t)); |
| if (sidkey->datalen != sizeof(uid_t)) { |
| rc = -EIO; |
| cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu)\n", |
| __func__, sidkey->datalen); |
| key_invalidate(sidkey); |
| goto out_key_put; |
| } |
| |
| if (sidtype == SIDOWNER) { |
| kuid_t uid; |
| uid_t id; |
| memcpy(&id, &sidkey->payload.data[0], sizeof(uid_t)); |
| uid = make_kuid(&init_user_ns, id); |
| if (uid_valid(uid)) |
| fuid = uid; |
| } else { |
| kgid_t gid; |
| gid_t id; |
| memcpy(&id, &sidkey->payload.data[0], sizeof(gid_t)); |
| gid = make_kgid(&init_user_ns, id); |
| if (gid_valid(gid)) |
| fgid = gid; |
| } |
| |
| out_key_put: |
| key_put(sidkey); |
| out_revert_creds: |
| revert_creds(saved_cred); |
| kfree(sidstr); |
| |
| /* |
| * Note that we return 0 here unconditionally. If the mapping |
| * fails then we just fall back to using the mnt_uid/mnt_gid. |
| */ |
| got_valid_id: |
| rc = 0; |
| if (sidtype == SIDOWNER) |
| fattr->cf_uid = fuid; |
| else |
| fattr->cf_gid = fgid; |
| return rc; |
| } |
| |
| int |
| init_cifs_idmap(void) |
| { |
| struct cred *cred; |
| struct key *keyring; |
| int ret; |
| |
| cifs_dbg(FYI, "Registering the %s key type\n", |
| cifs_idmap_key_type.name); |
| |
| /* create an override credential set with a special thread keyring in |
| * which requests are cached |
| * |
| * this is used to prevent malicious redirections from being installed |
| * with add_key(). |
| */ |
| cred = prepare_kernel_cred(NULL); |
| if (!cred) |
| return -ENOMEM; |
| |
| keyring = keyring_alloc(".cifs_idmap", |
| GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred, |
| (KEY_POS_ALL & ~KEY_POS_SETATTR) | |
| KEY_USR_VIEW | KEY_USR_READ, |
| KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL); |
| if (IS_ERR(keyring)) { |
| ret = PTR_ERR(keyring); |
| goto failed_put_cred; |
| } |
| |
| ret = register_key_type(&cifs_idmap_key_type); |
| if (ret < 0) |
| goto failed_put_key; |
| |
| /* instruct request_key() to use this special keyring as a cache for |
| * the results it looks up */ |
| set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); |
| cred->thread_keyring = keyring; |
| cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; |
| root_cred = cred; |
| |
| cifs_dbg(FYI, "cifs idmap keyring: %d\n", key_serial(keyring)); |
| return 0; |
| |
| failed_put_key: |
| key_put(keyring); |
| failed_put_cred: |
| put_cred(cred); |
| return ret; |
| } |
| |
| void |
| exit_cifs_idmap(void) |
| { |
| key_revoke(root_cred->thread_keyring); |
| unregister_key_type(&cifs_idmap_key_type); |
| put_cred(root_cred); |
| cifs_dbg(FYI, "Unregistered %s key type\n", cifs_idmap_key_type.name); |
| } |
| |
| /* copy ntsd, owner sid, and group sid from a security descriptor to another */ |
| static void copy_sec_desc(const struct cifs_ntsd *pntsd, |
| struct cifs_ntsd *pnntsd, __u32 sidsoffset) |
| { |
| struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
| struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr; |
| |
| /* copy security descriptor control portion */ |
| pnntsd->revision = pntsd->revision; |
| pnntsd->type = pntsd->type; |
| pnntsd->dacloffset = cpu_to_le32(sizeof(struct cifs_ntsd)); |
| pnntsd->sacloffset = 0; |
| pnntsd->osidoffset = cpu_to_le32(sidsoffset); |
| pnntsd->gsidoffset = cpu_to_le32(sidsoffset + sizeof(struct cifs_sid)); |
| |
| /* copy owner sid */ |
| owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| le32_to_cpu(pntsd->osidoffset)); |
| nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset); |
| cifs_copy_sid(nowner_sid_ptr, owner_sid_ptr); |
| |
| /* copy group sid */ |
| group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| le32_to_cpu(pntsd->gsidoffset)); |
| ngroup_sid_ptr = (struct cifs_sid *)((char *)pnntsd + sidsoffset + |
| sizeof(struct cifs_sid)); |
| cifs_copy_sid(ngroup_sid_ptr, group_sid_ptr); |
| |
| return; |
| } |
| |
| |
| /* |
| change posix mode to reflect permissions |
| pmode is the existing mode (we only want to overwrite part of this |
| bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007 |
| */ |
| static void access_flags_to_mode(__le32 ace_flags, int type, umode_t *pmode, |
| umode_t *pbits_to_set) |
| { |
| __u32 flags = le32_to_cpu(ace_flags); |
| /* the order of ACEs is important. The canonical order is to begin with |
| DENY entries followed by ALLOW, otherwise an allow entry could be |
| encountered first, making the subsequent deny entry like "dead code" |
| which would be superflous since Windows stops when a match is made |
| for the operation you are trying to perform for your user */ |
| |
| /* For deny ACEs we change the mask so that subsequent allow access |
| control entries do not turn on the bits we are denying */ |
| if (type == ACCESS_DENIED) { |
| if (flags & GENERIC_ALL) |
| *pbits_to_set &= ~S_IRWXUGO; |
| |
| if ((flags & GENERIC_WRITE) || |
| ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) |
| *pbits_to_set &= ~S_IWUGO; |
| if ((flags & GENERIC_READ) || |
| ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) |
| *pbits_to_set &= ~S_IRUGO; |
| if ((flags & GENERIC_EXECUTE) || |
| ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) |
| *pbits_to_set &= ~S_IXUGO; |
| return; |
| } else if (type != ACCESS_ALLOWED) { |
| cifs_dbg(VFS, "unknown access control type %d\n", type); |
| return; |
| } |
| /* else ACCESS_ALLOWED type */ |
| |
| if (flags & GENERIC_ALL) { |
| *pmode |= (S_IRWXUGO & (*pbits_to_set)); |
| cifs_dbg(NOISY, "all perms\n"); |
| return; |
| } |
| if ((flags & GENERIC_WRITE) || |
| ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) |
| *pmode |= (S_IWUGO & (*pbits_to_set)); |
| if ((flags & GENERIC_READ) || |
| ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) |
| *pmode |= (S_IRUGO & (*pbits_to_set)); |
| if ((flags & GENERIC_EXECUTE) || |
| ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) |
| *pmode |= (S_IXUGO & (*pbits_to_set)); |
| |
| cifs_dbg(NOISY, "access flags 0x%x mode now %04o\n", flags, *pmode); |
| return; |
| } |
| |
| /* |
| Generate access flags to reflect permissions mode is the existing mode. |
| This function is called for every ACE in the DACL whose SID matches |
| with either owner or group or everyone. |
| */ |
| |
| static void mode_to_access_flags(umode_t mode, umode_t bits_to_use, |
| __u32 *pace_flags) |
| { |
| /* reset access mask */ |
| *pace_flags = 0x0; |
| |
| /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */ |
| mode &= bits_to_use; |
| |
| /* check for R/W/X UGO since we do not know whose flags |
| is this but we have cleared all the bits sans RWX for |
| either user or group or other as per bits_to_use */ |
| if (mode & S_IRUGO) |
| *pace_flags |= SET_FILE_READ_RIGHTS; |
| if (mode & S_IWUGO) |
| *pace_flags |= SET_FILE_WRITE_RIGHTS; |
| if (mode & S_IXUGO) |
| *pace_flags |= SET_FILE_EXEC_RIGHTS; |
| |
| cifs_dbg(NOISY, "mode: %04o, access flags now 0x%x\n", |
| mode, *pace_flags); |
| return; |
| } |
| |
| static __u16 fill_ace_for_sid(struct cifs_ace *pntace, |
| const struct cifs_sid *psid, __u64 nmode, umode_t bits) |
| { |
| int i; |
| __u16 size = 0; |
| __u32 access_req = 0; |
| |
| pntace->type = ACCESS_ALLOWED; |
| pntace->flags = 0x0; |
| mode_to_access_flags(nmode, bits, &access_req); |
| if (!access_req) |
| access_req = SET_MINIMUM_RIGHTS; |
| pntace->access_req = cpu_to_le32(access_req); |
| |
| pntace->sid.revision = psid->revision; |
| pntace->sid.num_subauth = psid->num_subauth; |
| for (i = 0; i < NUM_AUTHS; i++) |
| pntace->sid.authority[i] = psid->authority[i]; |
| for (i = 0; i < psid->num_subauth; i++) |
| pntace->sid.sub_auth[i] = psid->sub_auth[i]; |
| |
| size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4); |
| pntace->size = cpu_to_le16(size); |
| |
| return size; |
| } |
| |
| |
| #ifdef CONFIG_CIFS_DEBUG2 |
| static void dump_ace(struct cifs_ace *pace, char *end_of_acl) |
| { |
| int num_subauth; |
| |
| /* validate that we do not go past end of acl */ |
| |
| if (le16_to_cpu(pace->size) < 16) { |
| cifs_dbg(VFS, "ACE too small %d\n", le16_to_cpu(pace->size)); |
| return; |
| } |
| |
| if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) { |
| cifs_dbg(VFS, "ACL too small to parse ACE\n"); |
| return; |
| } |
| |
| num_subauth = pace->sid.num_subauth; |
| if (num_subauth) { |
| int i; |
| cifs_dbg(FYI, "ACE revision %d num_auth %d type %d flags %d size %d\n", |
| pace->sid.revision, pace->sid.num_subauth, pace->type, |
| pace->flags, le16_to_cpu(pace->size)); |
| for (i = 0; i < num_subauth; ++i) { |
| cifs_dbg(FYI, "ACE sub_auth[%d]: 0x%x\n", |
| i, le32_to_cpu(pace->sid.sub_auth[i])); |
| } |
| |
| /* BB add length check to make sure that we do not have huge |
| num auths and therefore go off the end */ |
| } |
| |
| return; |
| } |
| #endif |
| |
| static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl, |
| struct cifs_sid *pownersid, struct cifs_sid *pgrpsid, |
| struct cifs_fattr *fattr, bool mode_from_special_sid) |
| { |
| int i; |
| int num_aces = 0; |
| int acl_size; |
| char *acl_base; |
| struct cifs_ace **ppace; |
| |
| /* BB need to add parm so we can store the SID BB */ |
| |
| if (!pdacl) { |
| /* no DACL in the security descriptor, set |
| all the permissions for user/group/other */ |
| fattr->cf_mode |= S_IRWXUGO; |
| return; |
| } |
| |
| /* validate that we do not go past end of acl */ |
| if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) { |
| cifs_dbg(VFS, "ACL too small to parse DACL\n"); |
| return; |
| } |
| |
| cifs_dbg(NOISY, "DACL revision %d size %d num aces %d\n", |
| le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size), |
| le32_to_cpu(pdacl->num_aces)); |
| |
| /* reset rwx permissions for user/group/other. |
| Also, if num_aces is 0 i.e. DACL has no ACEs, |
| user/group/other have no permissions */ |
| fattr->cf_mode &= ~(S_IRWXUGO); |
| |
| acl_base = (char *)pdacl; |
| acl_size = sizeof(struct cifs_acl); |
| |
| num_aces = le32_to_cpu(pdacl->num_aces); |
| if (num_aces > 0) { |
| umode_t user_mask = S_IRWXU; |
| umode_t group_mask = S_IRWXG; |
| umode_t other_mask = S_IRWXU | S_IRWXG | S_IRWXO; |
| |
| if (num_aces > ULONG_MAX / sizeof(struct cifs_ace *)) |
| return; |
| ppace = kmalloc_array(num_aces, sizeof(struct cifs_ace *), |
| GFP_KERNEL); |
| if (!ppace) |
| return; |
| |
| for (i = 0; i < num_aces; ++i) { |
| ppace[i] = (struct cifs_ace *) (acl_base + acl_size); |
| #ifdef CONFIG_CIFS_DEBUG2 |
| dump_ace(ppace[i], end_of_acl); |
| #endif |
| if (mode_from_special_sid && |
| (compare_sids(&(ppace[i]->sid), |
| &sid_unix_NFS_mode) == 0)) { |
| /* |
| * Full permissions are: |
| * 07777 = S_ISUID | S_ISGID | S_ISVTX | |
| * S_IRWXU | S_IRWXG | S_IRWXO |
| */ |
| fattr->cf_mode &= ~07777; |
| fattr->cf_mode |= |
| le32_to_cpu(ppace[i]->sid.sub_auth[2]); |
| break; |
| } else if (compare_sids(&(ppace[i]->sid), pownersid) == 0) |
| access_flags_to_mode(ppace[i]->access_req, |
| ppace[i]->type, |
| &fattr->cf_mode, |
| &user_mask); |
| else if (compare_sids(&(ppace[i]->sid), pgrpsid) == 0) |
| access_flags_to_mode(ppace[i]->access_req, |
| ppace[i]->type, |
| &fattr->cf_mode, |
| &group_mask); |
| else if (compare_sids(&(ppace[i]->sid), &sid_everyone) == 0) |
| access_flags_to_mode(ppace[i]->access_req, |
| ppace[i]->type, |
| &fattr->cf_mode, |
| &other_mask); |
| else if (compare_sids(&(ppace[i]->sid), &sid_authusers) == 0) |
| access_flags_to_mode(ppace[i]->access_req, |
| ppace[i]->type, |
| &fattr->cf_mode, |
| &other_mask); |
| |
| |
| /* memcpy((void *)(&(cifscred->aces[i])), |
| (void *)ppace[i], |
| sizeof(struct cifs_ace)); */ |
| |
| acl_base = (char *)ppace[i]; |
| acl_size = le16_to_cpu(ppace[i]->size); |
| } |
| |
| kfree(ppace); |
| } |
| |
| return; |
| } |
| |
| unsigned int setup_authusers_ACE(struct cifs_ace *pntace) |
| { |
| int i; |
| unsigned int ace_size = 20; |
| |
| pntace->type = ACCESS_ALLOWED_ACE_TYPE; |
| pntace->flags = 0x0; |
| pntace->access_req = cpu_to_le32(GENERIC_ALL); |
| pntace->sid.num_subauth = 1; |
| pntace->sid.revision = 1; |
| for (i = 0; i < NUM_AUTHS; i++) |
| pntace->sid.authority[i] = sid_authusers.authority[i]; |
| |
| pntace->sid.sub_auth[0] = sid_authusers.sub_auth[0]; |
| |
| /* size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth*4) */ |
| pntace->size = cpu_to_le16(ace_size); |
| return ace_size; |
| } |
| |
| /* |
| * Fill in the special SID based on the mode. See |
| * http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx |
| */ |
| unsigned int setup_special_mode_ACE(struct cifs_ace *pntace, __u64 nmode) |
| { |
| int i; |
| unsigned int ace_size = 28; |
| |
| pntace->type = ACCESS_DENIED_ACE_TYPE; |
| pntace->flags = 0x0; |
| pntace->access_req = 0; |
| pntace->sid.num_subauth = 3; |
| pntace->sid.revision = 1; |
| for (i = 0; i < NUM_AUTHS; i++) |
| pntace->sid.authority[i] = sid_unix_NFS_mode.authority[i]; |
| |
| pntace->sid.sub_auth[0] = sid_unix_NFS_mode.sub_auth[0]; |
| pntace->sid.sub_auth[1] = sid_unix_NFS_mode.sub_auth[1]; |
| pntace->sid.sub_auth[2] = cpu_to_le32(nmode & 07777); |
| |
| /* size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth*4) */ |
| pntace->size = cpu_to_le16(ace_size); |
| return ace_size; |
| } |
| |
| static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid, |
| struct cifs_sid *pgrpsid, __u64 nmode, bool modefromsid) |
| { |
| u16 size = 0; |
| u32 num_aces = 0; |
| struct cifs_acl *pnndacl; |
| |
| pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl)); |
| |
| if (modefromsid) { |
| struct cifs_ace *pntace = |
| (struct cifs_ace *)((char *)pnndacl + size); |
| |
| size += setup_special_mode_ACE(pntace, nmode); |
| num_aces++; |
| } |
| |
| size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size), |
| pownersid, nmode, S_IRWXU); |
| num_aces++; |
| size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), |
| pgrpsid, nmode, S_IRWXG); |
| num_aces++; |
| size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), |
| &sid_everyone, nmode, S_IRWXO); |
| num_aces++; |
| |
| pndacl->num_aces = cpu_to_le32(num_aces); |
| pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl)); |
| |
| return 0; |
| } |
| |
| |
| static int parse_sid(struct cifs_sid *psid, char *end_of_acl) |
| { |
| /* BB need to add parm so we can store the SID BB */ |
| |
| /* validate that we do not go past end of ACL - sid must be at least 8 |
| bytes long (assuming no sub-auths - e.g. the null SID */ |
| if (end_of_acl < (char *)psid + 8) { |
| cifs_dbg(VFS, "ACL too small to parse SID %p\n", psid); |
| return -EINVAL; |
| } |
| |
| #ifdef CONFIG_CIFS_DEBUG2 |
| if (psid->num_subauth) { |
| int i; |
| cifs_dbg(FYI, "SID revision %d num_auth %d\n", |
| psid->revision, psid->num_subauth); |
| |
| for (i = 0; i < psid->num_subauth; i++) { |
| cifs_dbg(FYI, "SID sub_auth[%d]: 0x%x\n", |
| i, le32_to_cpu(psid->sub_auth[i])); |
| } |
| |
| /* BB add length check to make sure that we do not have huge |
| num auths and therefore go off the end */ |
| cifs_dbg(FYI, "RID 0x%x\n", |
| le32_to_cpu(psid->sub_auth[psid->num_subauth-1])); |
| } |
| #endif |
| |
| return 0; |
| } |
| |
| |
| /* Convert CIFS ACL to POSIX form */ |
| static int parse_sec_desc(struct cifs_sb_info *cifs_sb, |
| struct cifs_ntsd *pntsd, int acl_len, struct cifs_fattr *fattr, |
| bool get_mode_from_special_sid) |
| { |
| int rc = 0; |
| struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
| struct cifs_acl *dacl_ptr; /* no need for SACL ptr */ |
| char *end_of_acl = ((char *)pntsd) + acl_len; |
| __u32 dacloffset; |
| |
| if (pntsd == NULL) |
| return -EIO; |
| |
| owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| le32_to_cpu(pntsd->osidoffset)); |
| group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| le32_to_cpu(pntsd->gsidoffset)); |
| dacloffset = le32_to_cpu(pntsd->dacloffset); |
| dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); |
| cifs_dbg(NOISY, "revision %d type 0x%x ooffset 0x%x goffset 0x%x sacloffset 0x%x dacloffset 0x%x\n", |
| pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset), |
| le32_to_cpu(pntsd->gsidoffset), |
| le32_to_cpu(pntsd->sacloffset), dacloffset); |
| /* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */ |
| rc = parse_sid(owner_sid_ptr, end_of_acl); |
| if (rc) { |
| cifs_dbg(FYI, "%s: Error %d parsing Owner SID\n", __func__, rc); |
| return rc; |
| } |
| rc = sid_to_id(cifs_sb, owner_sid_ptr, fattr, SIDOWNER); |
| if (rc) { |
| cifs_dbg(FYI, "%s: Error %d mapping Owner SID to uid\n", |
| __func__, rc); |
| return rc; |
| } |
| |
| rc = parse_sid(group_sid_ptr, end_of_acl); |
| if (rc) { |
| cifs_dbg(FYI, "%s: Error %d mapping Owner SID to gid\n", |
| __func__, rc); |
| return rc; |
| } |
| rc = sid_to_id(cifs_sb, group_sid_ptr, fattr, SIDGROUP); |
| if (rc) { |
| cifs_dbg(FYI, "%s: Error %d mapping Group SID to gid\n", |
| __func__, rc); |
| return rc; |
| } |
| |
| if (dacloffset) |
| parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, |
| group_sid_ptr, fattr, get_mode_from_special_sid); |
| else |
| cifs_dbg(FYI, "no ACL\n"); /* BB grant all or default perms? */ |
| |
| return rc; |
| } |
| |
| /* Convert permission bits from mode to equivalent CIFS ACL */ |
| static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd, |
| __u32 secdesclen, __u64 nmode, kuid_t uid, kgid_t gid, |
| bool mode_from_sid, int *aclflag) |
| { |
| int rc = 0; |
| __u32 dacloffset; |
| __u32 ndacloffset; |
| __u32 sidsoffset; |
| struct cifs_sid *owner_sid_ptr, *group_sid_ptr; |
| struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr; |
| struct cifs_acl *dacl_ptr = NULL; /* no need for SACL ptr */ |
| struct cifs_acl *ndacl_ptr = NULL; /* no need for SACL ptr */ |
| |
| if (nmode != NO_CHANGE_64) { /* chmod */ |
| owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| le32_to_cpu(pntsd->osidoffset)); |
| group_sid_ptr = (struct cifs_sid *)((char *)pntsd + |
| le32_to_cpu(pntsd->gsidoffset)); |
| dacloffset = le32_to_cpu(pntsd->dacloffset); |
| dacl_ptr = (struct cifs_acl *)((char *)pntsd + dacloffset); |
| ndacloffset = sizeof(struct cifs_ntsd); |
| ndacl_ptr = (struct cifs_acl *)((char *)pnntsd + ndacloffset); |
| ndacl_ptr->revision = dacl_ptr->revision; |
| ndacl_ptr->size = 0; |
| ndacl_ptr->num_aces = 0; |
| |
| rc = set_chmod_dacl(ndacl_ptr, owner_sid_ptr, group_sid_ptr, |
| nmode, mode_from_sid); |
| sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size); |
| /* copy sec desc control portion & owner and group sids */ |
| copy_sec_desc(pntsd, pnntsd, sidsoffset); |
| *aclflag = CIFS_ACL_DACL; |
| } else { |
| memcpy(pnntsd, pntsd, secdesclen); |
| if (uid_valid(uid)) { /* chown */ |
| uid_t id; |
| owner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + |
| le32_to_cpu(pnntsd->osidoffset)); |
| nowner_sid_ptr = kmalloc(sizeof(struct cifs_sid), |
| GFP_KERNEL); |
| if (!nowner_sid_ptr) |
| return -ENOMEM; |
| id = from_kuid(&init_user_ns, uid); |
| rc = id_to_sid(id, SIDOWNER, nowner_sid_ptr); |
| if (rc) { |
| cifs_dbg(FYI, "%s: Mapping error %d for owner id %d\n", |
| __func__, rc, id); |
| kfree(nowner_sid_ptr); |
| return rc; |
| } |
| cifs_copy_sid(owner_sid_ptr, nowner_sid_ptr); |
| kfree(nowner_sid_ptr); |
| *aclflag = CIFS_ACL_OWNER; |
| } |
| if (gid_valid(gid)) { /* chgrp */ |
| gid_t id; |
| group_sid_ptr = (struct cifs_sid *)((char *)pnntsd + |
| le32_to_cpu(pnntsd->gsidoffset)); |
| ngroup_sid_ptr = kmalloc(sizeof(struct cifs_sid), |
| GFP_KERNEL); |
| if (!ngroup_sid_ptr) |
| return -ENOMEM; |
| id = from_kgid(&init_user_ns, gid); |
| rc = id_to_sid(id, SIDGROUP, ngroup_sid_ptr); |
| if (rc) { |
| cifs_dbg(FYI, "%s: Mapping error %d for group id %d\n", |
| __func__, rc, id); |
| kfree(ngroup_sid_ptr); |
| return rc; |
| } |
| cifs_copy_sid(group_sid_ptr, ngroup_sid_ptr); |
| kfree(ngroup_sid_ptr); |
| *aclflag = CIFS_ACL_GROUP; |
| } |
| } |
| |
| return rc; |
| } |
| |
| struct cifs_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb, |
| const struct cifs_fid *cifsfid, u32 *pacllen) |
| { |
| struct cifs_ntsd *pntsd = NULL; |
| unsigned int xid; |
| int rc; |
| struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
| |
| if (IS_ERR(tlink)) |
| return ERR_CAST(tlink); |
| |
| xid = get_xid(); |
| rc = CIFSSMBGetCIFSACL(xid, tlink_tcon(tlink), cifsfid->netfid, &pntsd, |
| pacllen); |
| free_xid(xid); |
| |
| cifs_put_tlink(tlink); |
| |
| cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen); |
| if (rc) |
| return ERR_PTR(rc); |
| return pntsd; |
| } |
| |
| static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb, |
| const char *path, u32 *pacllen) |
| { |
| struct cifs_ntsd *pntsd = NULL; |
| int oplock = 0; |
| unsigned int xid; |
| int rc; |
| struct cifs_tcon *tcon; |
| struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
| struct cifs_fid fid; |
| struct cifs_open_parms oparms; |
| |
| if (IS_ERR(tlink)) |
| return ERR_CAST(tlink); |
| |
| tcon = tlink_tcon(tlink); |
| xid = get_xid(); |
| |
| oparms.tcon = tcon; |
| oparms.cifs_sb = cifs_sb; |
| oparms.desired_access = READ_CONTROL; |
| oparms.create_options = cifs_create_options(cifs_sb, 0); |
| oparms.disposition = FILE_OPEN; |
| oparms.path = path; |
| oparms.fid = &fid; |
| oparms.reconnect = false; |
| |
| rc = CIFS_open(xid, &oparms, &oplock, NULL); |
| if (!rc) { |
| rc = CIFSSMBGetCIFSACL(xid, tcon, fid.netfid, &pntsd, pacllen); |
| CIFSSMBClose(xid, tcon, fid.netfid); |
| } |
| |
| cifs_put_tlink(tlink); |
| free_xid(xid); |
| |
| cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen); |
| if (rc) |
| return ERR_PTR(rc); |
| return pntsd; |
| } |
| |
| /* Retrieve an ACL from the server */ |
| struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb, |
| struct inode *inode, const char *path, |
| u32 *pacllen) |
| { |
| struct cifs_ntsd *pntsd = NULL; |
| struct cifsFileInfo *open_file = NULL; |
| |
| if (inode) |
| open_file = find_readable_file(CIFS_I(inode), true); |
| if (!open_file) |
| return get_cifs_acl_by_path(cifs_sb, path, pacllen); |
| |
| pntsd = get_cifs_acl_by_fid(cifs_sb, &open_file->fid, pacllen); |
| cifsFileInfo_put(open_file); |
| return pntsd; |
| } |
| |
| /* Set an ACL on the server */ |
| int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen, |
| struct inode *inode, const char *path, int aclflag) |
| { |
| int oplock = 0; |
| unsigned int xid; |
| int rc, access_flags; |
| struct cifs_tcon *tcon; |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
| struct cifs_fid fid; |
| struct cifs_open_parms oparms; |
| |
| if (IS_ERR(tlink)) |
| return PTR_ERR(tlink); |
| |
| tcon = tlink_tcon(tlink); |
| xid = get_xid(); |
| |
| if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP) |
| access_flags = WRITE_OWNER; |
| else |
| access_flags = WRITE_DAC; |
| |
| oparms.tcon = tcon; |
| oparms.cifs_sb = cifs_sb; |
| oparms.desired_access = access_flags; |
| oparms.create_options = cifs_create_options(cifs_sb, 0); |
| oparms.disposition = FILE_OPEN; |
| oparms.path = path; |
| oparms.fid = &fid; |
| oparms.reconnect = false; |
| |
| rc = CIFS_open(xid, &oparms, &oplock, NULL); |
| if (rc) { |
| cifs_dbg(VFS, "Unable to open file to set ACL\n"); |
| goto out; |
| } |
| |
| rc = CIFSSMBSetCIFSACL(xid, tcon, fid.netfid, pnntsd, acllen, aclflag); |
| cifs_dbg(NOISY, "SetCIFSACL rc = %d\n", rc); |
| |
| CIFSSMBClose(xid, tcon, fid.netfid); |
| out: |
| free_xid(xid); |
| cifs_put_tlink(tlink); |
| return rc; |
| } |
| |
| /* Translate the CIFS ACL (similar to NTFS ACL) for a file into mode bits */ |
| int |
| cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr, |
| struct inode *inode, bool mode_from_special_sid, |
| const char *path, const struct cifs_fid *pfid) |
| { |
| struct cifs_ntsd *pntsd = NULL; |
| u32 acllen = 0; |
| int rc = 0; |
| struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
| struct smb_version_operations *ops; |
| |
| cifs_dbg(NOISY, "converting ACL to mode for %s\n", path); |
| |
| if (IS_ERR(tlink)) |
| return PTR_ERR(tlink); |
| |
| ops = tlink_tcon(tlink)->ses->server->ops; |
| |
| if (pfid && (ops->get_acl_by_fid)) |
| pntsd = ops->get_acl_by_fid(cifs_sb, pfid, &acllen); |
| else if (ops->get_acl) |
| pntsd = ops->get_acl(cifs_sb, inode, path, &acllen); |
| else { |
| cifs_put_tlink(tlink); |
| return -EOPNOTSUPP; |
| } |
| /* if we can retrieve the ACL, now parse Access Control Entries, ACEs */ |
| if (IS_ERR(pntsd)) { |
| rc = PTR_ERR(pntsd); |
| cifs_dbg(VFS, "%s: error %d getting sec desc\n", __func__, rc); |
| } else if (mode_from_special_sid) { |
| rc = parse_sec_desc(cifs_sb, pntsd, acllen, fattr, true); |
| } else { |
| /* get approximated mode from ACL */ |
| rc = parse_sec_desc(cifs_sb, pntsd, acllen, fattr, false); |
| kfree(pntsd); |
| if (rc) |
| cifs_dbg(VFS, "parse sec desc failed rc = %d\n", rc); |
| } |
| |
| cifs_put_tlink(tlink); |
| |
| return rc; |
| } |
| |
| /* Convert mode bits to an ACL so we can update the ACL on the server */ |
| int |
| id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 nmode, |
| kuid_t uid, kgid_t gid) |
| { |
| int rc = 0; |
| int aclflag = CIFS_ACL_DACL; /* default flag to set */ |
| __u32 secdesclen = 0; |
| struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */ |
| struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */ |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); |
| struct smb_version_operations *ops; |
| bool mode_from_sid; |
| |
| if (IS_ERR(tlink)) |
| return PTR_ERR(tlink); |
| |
| ops = tlink_tcon(tlink)->ses->server->ops; |
| |
| cifs_dbg(NOISY, "set ACL from mode for %s\n", path); |
| |
| /* Get the security descriptor */ |
| |
| if (ops->get_acl == NULL) { |
| cifs_put_tlink(tlink); |
| return -EOPNOTSUPP; |
| } |
| |
| pntsd = ops->get_acl(cifs_sb, inode, path, &secdesclen); |
| if (IS_ERR(pntsd)) { |
| rc = PTR_ERR(pntsd); |
| cifs_dbg(VFS, "%s: error %d getting sec desc\n", __func__, rc); |
| cifs_put_tlink(tlink); |
| return rc; |
| } |
| |
| /* |
| * Add three ACEs for owner, group, everyone getting rid of other ACEs |
| * as chmod disables ACEs and set the security descriptor. Allocate |
| * memory for the smb header, set security descriptor request security |
| * descriptor parameters, and secuirty descriptor itself |
| */ |
| secdesclen = max_t(u32, secdesclen, DEFAULT_SEC_DESC_LEN); |
| pnntsd = kmalloc(secdesclen, GFP_KERNEL); |
| if (!pnntsd) { |
| kfree(pntsd); |
| cifs_put_tlink(tlink); |
| return -ENOMEM; |
| } |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) |
| mode_from_sid = true; |
| else |
| mode_from_sid = false; |
| |
| rc = build_sec_desc(pntsd, pnntsd, secdesclen, nmode, uid, gid, |
| mode_from_sid, &aclflag); |
| |
| cifs_dbg(NOISY, "build_sec_desc rc: %d\n", rc); |
| |
| if (ops->set_acl == NULL) |
| rc = -EOPNOTSUPP; |
| |
| if (!rc) { |
| /* Set the security descriptor */ |
| rc = ops->set_acl(pnntsd, secdesclen, inode, path, aclflag); |
| cifs_dbg(NOISY, "set_cifs_acl rc: %d\n", rc); |
| } |
| cifs_put_tlink(tlink); |
| |
| kfree(pnntsd); |
| kfree(pntsd); |
| return rc; |
| } |