diff options
Diffstat (limited to 'source3/modules/vfs_posixacl.c')
| -rw-r--r-- | source3/modules/vfs_posixacl.c | 406 |
1 files changed, 406 insertions, 0 deletions
diff --git a/source3/modules/vfs_posixacl.c b/source3/modules/vfs_posixacl.c new file mode 100644 index 0000000..2c2b689 --- /dev/null +++ b/source3/modules/vfs_posixacl.c @@ -0,0 +1,406 @@ +/* + Unix SMB/Netbios implementation. + VFS module to get and set posix acls + Copyright (C) Volker Lendecke 2006 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" +#include "system/filesys.h" +#include "smbd/smbd.h" +#include "modules/vfs_posixacl.h" + +/* prototypes for static functions first - for clarity */ + +static bool smb_ace_to_internal(acl_entry_t posix_ace, + struct smb_acl_entry *ace); +static struct smb_acl_t *smb_acl_to_internal(acl_t acl, TALLOC_CTX *mem_ctx); +static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm); +static acl_t smb_acl_to_posix(const struct smb_acl_t *acl); + + +/* public functions - the api */ + +SMB_ACL_T posixacl_sys_acl_get_fd(vfs_handle_struct *handle, + files_struct *fsp, + SMB_ACL_TYPE_T type, + TALLOC_CTX *mem_ctx) +{ + struct smb_acl_t *result; + acl_t acl = NULL; + acl_type_t acl_type; + + switch(type) { + case SMB_ACL_TYPE_ACCESS: + acl_type = ACL_TYPE_ACCESS; + break; + case SMB_ACL_TYPE_DEFAULT: + acl_type = ACL_TYPE_DEFAULT; + break; + default: + errno = EINVAL; + return NULL; + } + if (!fsp->fsp_flags.is_pathref && (acl_type == ACL_TYPE_ACCESS)) { + /* POSIX API only allows ACL_TYPE_ACCESS fetched on fd. */ + acl = acl_get_fd(fsp_get_io_fd(fsp)); + } else if (fsp->fsp_flags.have_proc_fds) { + int fd = fsp_get_pathref_fd(fsp); + const char *proc_fd_path = NULL; + char buf[PATH_MAX]; + + proc_fd_path = sys_proc_fd_path(fd, buf, sizeof(buf)); + if (proc_fd_path == NULL) { + return NULL; + } + + acl = acl_get_file(proc_fd_path, acl_type); + } else { + /* + * This is no longer a handle based call. + */ + acl = acl_get_file(fsp->fsp_name->base_name, acl_type); + } + if (acl == NULL) { + return NULL; + } + + result = smb_acl_to_internal(acl, mem_ctx); + acl_free(acl); + return result; +} + +int posixacl_sys_acl_set_fd(vfs_handle_struct *handle, + files_struct *fsp, + SMB_ACL_TYPE_T type, + SMB_ACL_T theacl) +{ + int res; + acl_t acl = smb_acl_to_posix(theacl); + acl_type_t acl_type; + int fd = fsp_get_pathref_fd(fsp); + + if (acl == NULL) { + return -1; + } + + switch(type) { + case SMB_ACL_TYPE_ACCESS: + acl_type = ACL_TYPE_ACCESS; + break; + case SMB_ACL_TYPE_DEFAULT: + acl_type = ACL_TYPE_DEFAULT; + break; + default: + acl_free(acl); + errno = EINVAL; + return -1; + } + + if (!fsp->fsp_flags.is_pathref && type == SMB_ACL_TYPE_ACCESS) { + res = acl_set_fd(fd, acl); + } else if (fsp->fsp_flags.have_proc_fds) { + const char *proc_fd_path = NULL; + char buf[PATH_MAX]; + + proc_fd_path = sys_proc_fd_path(fd, buf, sizeof(buf)); + if (proc_fd_path == NULL) { + acl_free(acl); + return -1; + } + res = acl_set_file(proc_fd_path, acl_type, acl); + } else { + /* + * This is no longer a handle based call. + */ + res = acl_set_file(fsp->fsp_name->base_name, + acl_type, + acl); + } + + acl_free(acl); + return res; +} + +int posixacl_sys_acl_delete_def_fd(vfs_handle_struct *handle, + files_struct *fsp) +{ + if (fsp->fsp_flags.have_proc_fds) { + int fd = fsp_get_pathref_fd(fsp); + const char *proc_fd_path = NULL; + char buf[PATH_MAX]; + + proc_fd_path = sys_proc_fd_path(fd, buf, sizeof(buf)); + if (proc_fd_path == NULL) { + return -1; + } + return acl_delete_def_file(proc_fd_path); + } + + /* + * This is no longer a handle based call. + */ + return acl_delete_def_file(fsp->fsp_name->base_name); +} + +/* private functions */ + +static bool smb_ace_to_internal(acl_entry_t posix_ace, + struct smb_acl_entry *ace) +{ + acl_tag_t tag; + acl_permset_t permset; + + if (acl_get_tag_type(posix_ace, &tag) != 0) { + DEBUG(0, ("smb_acl_get_tag_type failed\n")); + return False; + } + + switch(tag) { + case ACL_USER: + ace->a_type = SMB_ACL_USER; + break; + case ACL_USER_OBJ: + ace->a_type = SMB_ACL_USER_OBJ; + break; + case ACL_GROUP: + ace->a_type = SMB_ACL_GROUP; + break; + case ACL_GROUP_OBJ: + ace->a_type = SMB_ACL_GROUP_OBJ; + break; + case ACL_OTHER: + ace->a_type = SMB_ACL_OTHER; + break; + case ACL_MASK: + ace->a_type = SMB_ACL_MASK; + break; +#ifdef HAVE_ACL_EVERYONE + case ACL_EVERYONE: + DEBUG(1, ("ACL tag type ACL_EVERYONE. FreeBSD with ZFS? Use 'vfs objects = zfsacl'\n")); + return false; +#endif + default: + DEBUG(0, ("unknown tag type %d\n", (unsigned int)tag)); + return False; + } + switch(ace->a_type) { + case SMB_ACL_USER: { + uid_t *puid = (uid_t *)acl_get_qualifier(posix_ace); + if (puid == NULL) { + DEBUG(0, ("smb_acl_get_qualifier failed\n")); + return False; + } + ace->info.user.uid = *puid; + acl_free(puid); + break; + } + + case SMB_ACL_GROUP: { + gid_t *pgid = (uid_t *)acl_get_qualifier(posix_ace); + if (pgid == NULL) { + DEBUG(0, ("smb_acl_get_qualifier failed\n")); + return False; + } + ace->info.group.gid = *pgid; + acl_free(pgid); + break; + } + default: + break; + } + if (acl_get_permset(posix_ace, &permset) != 0) { + DEBUG(0, ("smb_acl_get_mode failed\n")); + return False; + } + ace->a_perm = 0; +#ifdef HAVE_ACL_GET_PERM_NP + ace->a_perm |= (acl_get_perm_np(permset, ACL_READ) ? SMB_ACL_READ : 0); + ace->a_perm |= (acl_get_perm_np(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0); + ace->a_perm |= (acl_get_perm_np(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0); +#else + ace->a_perm |= (acl_get_perm(permset, ACL_READ) ? SMB_ACL_READ : 0); + ace->a_perm |= (acl_get_perm(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0); + ace->a_perm |= (acl_get_perm(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0); +#endif + return True; +} + +static struct smb_acl_t *smb_acl_to_internal(acl_t acl, TALLOC_CTX *mem_ctx) +{ + struct smb_acl_t *result = sys_acl_init(mem_ctx); + int entry_id = ACL_FIRST_ENTRY; + acl_entry_t e; + if (result == NULL) { + return NULL; + } + while (acl_get_entry(acl, entry_id, &e) == 1) { + + entry_id = ACL_NEXT_ENTRY; + + result->acl = talloc_realloc(result, result->acl, + struct smb_acl_entry, result->count+1); + if (result->acl == NULL) { + TALLOC_FREE(result); + DEBUG(0, ("talloc_realloc failed\n")); + errno = ENOMEM; + return NULL; + } + + if (!smb_ace_to_internal(e, &result->acl[result->count])) { + TALLOC_FREE(result); + return NULL; + } + + result->count += 1; + } + return result; +} + +static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm) +{ + int ret; + acl_permset_t permset; + + if ((ret = acl_get_permset(entry, &permset)) != 0) { + return ret; + } + if ((ret = acl_clear_perms(permset)) != 0) { + return ret; + } + if ((perm & SMB_ACL_READ) && + ((ret = acl_add_perm(permset, ACL_READ)) != 0)) { + return ret; + } + if ((perm & SMB_ACL_WRITE) && + ((ret = acl_add_perm(permset, ACL_WRITE)) != 0)) { + return ret; + } + if ((perm & SMB_ACL_EXECUTE) && + ((ret = acl_add_perm(permset, ACL_EXECUTE)) != 0)) { + return ret; + } + + return 0; +} + +static acl_t smb_acl_to_posix(const struct smb_acl_t *acl) +{ + acl_t result; + int i; + + result = acl_init(acl->count); + if (result == NULL) { + DEBUG(10, ("acl_init failed\n")); + return NULL; + } + + for (i=0; i<acl->count; i++) { + const struct smb_acl_entry *entry = &acl->acl[i]; + acl_entry_t e; + acl_tag_t tag; + + if (acl_create_entry(&result, &e) != 0) { + DEBUG(1, ("acl_create_entry failed: %s\n", + strerror(errno))); + goto fail; + } + + switch (entry->a_type) { + case SMB_ACL_USER: + tag = ACL_USER; + break; + case SMB_ACL_USER_OBJ: + tag = ACL_USER_OBJ; + break; + case SMB_ACL_GROUP: + tag = ACL_GROUP; + break; + case SMB_ACL_GROUP_OBJ: + tag = ACL_GROUP_OBJ; + break; + case SMB_ACL_OTHER: + tag = ACL_OTHER; + break; + case SMB_ACL_MASK: + tag = ACL_MASK; + break; + default: + DEBUG(1, ("Unknown tag value %d\n", entry->a_type)); + goto fail; + } + + if (acl_set_tag_type(e, tag) != 0) { + DEBUG(10, ("acl_set_tag_type(%d) failed: %s\n", + tag, strerror(errno))); + goto fail; + } + + switch (entry->a_type) { + case SMB_ACL_USER: + if (acl_set_qualifier(e, &entry->info.user.uid) != 0) { + DEBUG(1, ("acl_set_qualifiier failed: %s\n", + strerror(errno))); + goto fail; + } + break; + case SMB_ACL_GROUP: + if (acl_set_qualifier(e, &entry->info.group.gid) != 0) { + DEBUG(1, ("acl_set_qualifiier failed: %s\n", + strerror(errno))); + goto fail; + } + break; + default: /* Shut up, compiler! :-) */ + break; + } + + if (smb_acl_set_mode(e, entry->a_perm) != 0) { + goto fail; + } + } + + if (acl_valid(result) != 0) { + char *acl_string = sys_acl_to_text(acl, NULL); + DEBUG(0, ("smb_acl_to_posix: ACL %s is invalid for set (%s)\n", + acl_string, strerror(errno))); + SAFE_FREE(acl_string); + goto fail; + } + + return result; + + fail: + if (result != NULL) { + acl_free(result); + } + return NULL; +} + +/* VFS operations structure */ + +static struct vfs_fn_pointers posixacl_fns = { + .sys_acl_get_fd_fn = posixacl_sys_acl_get_fd, + .sys_acl_blob_get_fd_fn = posix_sys_acl_blob_get_fd, + .sys_acl_set_fd_fn = posixacl_sys_acl_set_fd, + .sys_acl_delete_def_fd_fn = posixacl_sys_acl_delete_def_fd, +}; + +static_decl_vfs; +NTSTATUS vfs_posixacl_init(TALLOC_CTX *ctx) +{ + return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "posixacl", + &posixacl_fns); +} |