diff options
Diffstat (limited to 'source4/ntvfs')
| -rw-r--r-- | source4/ntvfs/posix/pvfs_acl.c | 68 |
1 files changed, 58 insertions, 10 deletions
diff --git a/source4/ntvfs/posix/pvfs_acl.c b/source4/ntvfs/posix/pvfs_acl.c index 7a3002cf9f..addd6808ca 100644 --- a/source4/ntvfs/posix/pvfs_acl.c +++ b/source4/ntvfs/posix/pvfs_acl.c @@ -509,10 +509,10 @@ static bool pvfs_group_member(struct pvfs_state *pvfs, gid_t gid) If name is NULL then treat as a new file creation */ -NTSTATUS pvfs_access_check_unix(struct pvfs_state *pvfs, - struct ntvfs_request *req, - struct pvfs_filename *name, - uint32_t *access_mask) +static NTSTATUS pvfs_access_check_unix(struct pvfs_state *pvfs, + struct ntvfs_request *req, + struct pvfs_filename *name, + uint32_t *access_mask) { uid_t uid = geteuid(); uint32_t max_bits = SEC_RIGHTS_FILE_READ | SEC_FILE_ALL; @@ -592,6 +592,7 @@ NTSTATUS pvfs_access_check(struct pvfs_state *pvfs, struct xattr_NTACL *acl; NTSTATUS status; struct security_descriptor *sd; + bool allow_delete = false; /* on SMB2 a blank access mask is always denied */ if (pvfs->ntvfs->ctx->protocol == PROTOCOL_SMB2 && @@ -603,6 +604,16 @@ NTSTATUS pvfs_access_check(struct pvfs_state *pvfs, return NT_STATUS_ACCESS_DENIED; } + if (*access_mask & SEC_FLAG_MAXIMUM_ALLOWED || + *access_mask & SEC_STD_DELETE) { + status = pvfs_access_check_parent(pvfs, req, + name, SEC_DIR_DELETE_CHILD); + if (NT_STATUS_IS_OK(status)) { + allow_delete = true; + *access_mask &= ~SEC_STD_DELETE; + } + } + acl = talloc(req, struct xattr_NTACL); if (acl == NULL) { return NT_STATUS_NO_MEMORY; @@ -617,7 +628,8 @@ NTSTATUS pvfs_access_check(struct pvfs_state *pvfs, status = pvfs_acl_load(pvfs, name, -1, acl); if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) { talloc_free(acl); - return pvfs_access_check_unix(pvfs, req, name, access_mask); + status = pvfs_access_check_unix(pvfs, req, name, access_mask); + goto done; } if (!NT_STATUS_IS_OK(status)) { return status; @@ -633,15 +645,18 @@ NTSTATUS pvfs_access_check(struct pvfs_state *pvfs, /* check the acl against the required access mask */ status = se_access_check(sd, token, *access_mask, access_mask); - + talloc_free(acl); +done: if (pvfs->ntvfs->ctx->protocol != PROTOCOL_SMB2) { /* on SMB, this bit is always granted, even if not asked for */ *access_mask |= SEC_FILE_READ_ATTRIBUTE; } - talloc_free(acl); - + if (allow_delete) { + *access_mask |= SEC_STD_DELETE; + } + return status; } @@ -673,6 +688,8 @@ NTSTATUS pvfs_access_check_create(struct pvfs_state *pvfs, { struct pvfs_filename *parent; NTSTATUS status; + uint32_t parent_mask; + bool allow_delete = false; if (pvfs_read_only(pvfs, *access_mask)) { return NT_STATUS_ACCESS_DENIED; @@ -681,8 +698,35 @@ NTSTATUS pvfs_access_check_create(struct pvfs_state *pvfs, status = pvfs_resolve_parent(pvfs, req, name, &parent); NT_STATUS_NOT_OK_RETURN(status); - status = pvfs_access_check_simple(pvfs, req, parent, SEC_DIR_ADD_FILE); - NT_STATUS_NOT_OK_RETURN(status); + if (name->dos.attrib & FILE_ATTRIBUTE_DIRECTORY) { + parent_mask = SEC_DIR_ADD_SUBDIR; + } else { + parent_mask = SEC_DIR_ADD_FILE; + } + if (*access_mask & SEC_FLAG_MAXIMUM_ALLOWED || + *access_mask & SEC_STD_DELETE) { + parent_mask |= SEC_DIR_DELETE_CHILD; + } + + status = pvfs_access_check(pvfs, req, parent, &parent_mask); + if (NT_STATUS_IS_OK(status)) { + if (parent_mask & SEC_DIR_DELETE_CHILD) { + allow_delete = true; + } + } else if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) { + /* + * on ACCESS_DENIED we get the rejected bits + * remove the non critical SEC_DIR_DELETE_CHILD + * and check if something else was rejected. + */ + parent_mask &= ~SEC_DIR_DELETE_CHILD; + if (parent_mask != 0) { + return NT_STATUS_ACCESS_DENIED; + } + status = NT_STATUS_OK; + } else { + return status; + } if (*sd == NULL) { status = pvfs_acl_inherited_sd(pvfs, req, req, parent, container, sd); @@ -707,6 +751,10 @@ NTSTATUS pvfs_access_check_create(struct pvfs_state *pvfs, *access_mask |= SEC_FILE_READ_ATTRIBUTE; } + if (allow_delete) { + *access_mask |= SEC_STD_DELETE; + } + return NT_STATUS_OK; } |