sysacls.c

Rsync 3.0.5 source code

	/*
	 * note that since the definition of the structure pointed
	 * to by the SMB_ACL_T includes the first element of the
	 * acl[] array, this actually allocates an ACL with room
	 * for (count+1) entries
	 */
	if ((a = (SMB_ACL_T)SMB_MALLOC(sizeof a[0] + count * sizeof (struct acl))) == NULL) {
		errno = ENOMEM;
		return NULL;
	}

	a->size = count + 1;
	a->count = 0;
	a->next = -1;

	return a;
}


int sys_acl_create_entry(SMB_ACL_T *acl_p, SMB_ACL_ENTRY_T *entry_p)
{
	SMB_ACL_T	acl_d;
	SMB_ACL_ENTRY_T	entry_d;

	if (acl_p == NULL || entry_p == NULL || (acl_d = *acl_p) == NULL) {
		errno = EINVAL;
		return -1;
	}

	if (acl_d->count >= acl_d->size) {
		errno = ENOSPC;
		return -1;
	}

	entry_d		= &acl_d->acl[acl_d->count++];
	entry_d->a_type	= 0;
	entry_d->a_id	= -1;
	entry_d->a_perm	= 0;
	*entry_p	= entry_d;

	return 0;
}

int sys_acl_set_info(SMB_ACL_ENTRY_T entry, SMB_ACL_TAG_T tag_type, uint32 bits, id_t u_g_id)
{
	entry->a_type = tag_type;

	if (tag_type == SMB_ACL_USER || tag_type == SMB_ACL_GROUP)
		entry->a_id = u_g_id;

	entry->a_perm = bits;

	return 0;
}

int sys_acl_set_access_bits(SMB_ACL_ENTRY_T entry_d, uint32 bits)
{
	entry_d->a_perm = bits;
	return 0;
}

/*
 * sort the ACL and check it for validity
 *
 * if it's a minimal ACL with only 4 entries then we
 * need to recalculate the mask permissions to make
 * sure that they are the same as the GROUP_OBJ
 * permissions as required by the UnixWare acl() system call.
 *
 * (note: since POSIX allows minimal ACLs which only contain
 * 3 entries - ie there is no mask entry - we should, in theory,
 * check for this and add a mask entry if necessary - however
 * we "know" that the caller of this interface always specifies
 * a mask so, in practice "this never happens" (tm) - if it *does*
 * happen aclsort() will fail and return an error and someone will
 * have to fix it ...)
 */

static int acl_sort(SMB_ACL_T acl_d)
{
	int     fixmask = (acl_d->count <= 4);

	if (aclsort(acl_d->count, fixmask, acl_d->acl) != 0) {
		errno = EINVAL;
		return -1;
	}
	return 0;
}
 
int sys_acl_valid(SMB_ACL_T acl_d)
{
	return acl_sort(acl_d);
}

int sys_acl_set_file(const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
{
	struct stat	s;
	struct acl	*acl_p;
	int		acl_count;
	struct acl	*acl_buf	= NULL;
	int		ret;

	if (type != SMB_ACL_TYPE_ACCESS && type != SMB_ACL_TYPE_DEFAULT) {
		errno = EINVAL;
		return -1;
	}

	if (acl_sort(acl_d) != 0) {
		return -1;
	}

	acl_p		= &acl_d->acl[0];
	acl_count	= acl_d->count;

	/*
	 * if it's a directory there is extra work to do
	 * since the acl() system call will replace both
	 * the access ACLs and the default ACLs (if any)
	 */
	if (stat(name, &s) != 0) {
		return -1;
	}
	if (S_ISDIR(s.st_mode)) {
		SMB_ACL_T	acc_acl;
		SMB_ACL_T	def_acl;
		SMB_ACL_T	tmp_acl;
		int		i;

		if (type == SMB_ACL_TYPE_ACCESS) {
			acc_acl = acl_d;
			def_acl = tmp_acl = sys_acl_get_file(name, SMB_ACL_TYPE_DEFAULT);

		} else {
			def_acl = acl_d;
			acc_acl = tmp_acl = sys_acl_get_file(name, SMB_ACL_TYPE_ACCESS);
		}

		if (tmp_acl == NULL) {
			return -1;
		}

		/*
		 * allocate a temporary buffer for the complete ACL
		 */
		acl_count = acc_acl->count + def_acl->count;
		acl_p = acl_buf = SMB_MALLOC_ARRAY(struct acl, acl_count);

		if (acl_buf == NULL) {
			sys_acl_free_acl(tmp_acl);
			errno = ENOMEM;
			return -1;
		}

		/*
		 * copy the access control and default entries into the buffer
		 */
		memcpy(&acl_buf[0], &acc_acl->acl[0],
			acc_acl->count * sizeof(acl_buf[0]));

		memcpy(&acl_buf[acc_acl->count], &def_acl->acl[0],
			def_acl->count * sizeof(acl_buf[0]));

		/*
		 * set the ACL_DEFAULT flag on the default entries
		 */
		for (i = acc_acl->count; i < acl_count; i++) {
			acl_buf[i].a_type |= ACL_DEFAULT;
		}

		sys_acl_free_acl(tmp_acl);

	} else if (type != SMB_ACL_TYPE_ACCESS) {
		errno = EINVAL;
		return -1;
	}

	ret = acl(name, SETACL, acl_count, acl_p);

	SAFE_FREE(acl_buf);

	return ret;
}

#if 0
int sys_acl_set_fd(int fd, SMB_ACL_T acl_d)
{
	if (acl_sort(acl_d) != 0) {
		return -1;
	}

	return facl(fd, SETACL, acl_d->count, &acl_d->acl[0]);
}
#endif

int sys_acl_delete_def_file(const char *path)
{
	SMB_ACL_T	acl_d;
	int		ret;

	/*
	 * fetching the access ACL and rewriting it has
	 * the effect of deleting the default ACL
	 */
	if ((acl_d = sys_acl_get_file(path, SMB_ACL_TYPE_ACCESS)) == NULL) {
		return -1;
	}

	ret = acl(path, SETACL, acl_d->count, acl_d->acl);

	sys_acl_free_acl(acl_d);
	
	return ret;
}

int sys_acl_free_acl(SMB_ACL_T acl_d) 
{
	SAFE_FREE(acl_d);
	return 0;
}

#elif defined(HAVE_HPUX_ACLS) /*---------------------------------------------*/

#include <dl.h>

/*
 * Based on the Solaris/SCO code - with modifications.
 */

/*
 * Note that while this code implements sufficient functionality
 * to support the sys_acl_* interfaces it does not provide all
 * of the semantics of the POSIX ACL interfaces.
 *
 * In particular, an ACL entry descriptor (SMB_ACL_ENTRY_T) returned
 * from a call to sys_acl_get_entry() should not be assumed to be
 * valid after calling any of the following functions, which may
 * reorder the entries in the ACL.
 *
 *	sys_acl_valid()
 *	sys_acl_set_file()
 *	sys_acl_set_fd()
 */

/* This checks if the POSIX ACL system call is defined */
/* which basically corresponds to whether JFS 3.3 or   */
/* higher is installed. If acl() was called when it    */
/* isn't defined, it causes the process to core dump   */
/* so it is important to check this and avoid acl()    */
/* calls if it isn't there.                            */

static BOOL hpux_acl_call_presence(void)
{

	shl_t handle = NULL;
	void *value;
	int ret_val=0;
	static BOOL already_checked=0;

	if(already_checked)
		return True;


	ret_val = shl_findsym(&handle, "acl", TYPE_PROCEDURE, &value);

	if(ret_val != 0) {
		DEBUG(5, ("hpux_acl_call_presence: shl_findsym() returned %d, errno = %d, error %s\n",
			ret_val, errno, strerror(errno)));
		DEBUG(5,("hpux_acl_call_presence: acl() system call is not present. Check if you have JFS 3.3 and above?\n"));
		return False;
	}

	DEBUG(10,("hpux_acl_call_presence: acl() system call is present. We have JFS 3.3 or above \n"));

	already_checked = True;
	return True;
}

int sys_acl_get_entry(SMB_ACL_T acl_d, int entry_id, SMB_ACL_ENTRY_T *entry_p)
{
	if (entry_id != SMB_ACL_FIRST_ENTRY && entry_id != SMB_ACL_NEXT_ENTRY) {
		errno = EINVAL;
		return -1;
	}

	if (entry_p == NULL) {
		errno = EINVAL;
		return -1;
	}

	if (entry_id == SMB_ACL_FIRST_ENTRY) {
		acl_d->next = 0;
	}

	if (acl_d->next < 0) {
		errno = EINVAL;
		return -1;
	}

	if (acl_d->next >= acl_d->count) {
		return 0;
	}

	*entry_p = &acl_d->acl[acl_d->next++];

	return 1;
}

int sys_acl_get_tag_type(SMB_ACL_ENTRY_T entry_d, SMB_ACL_TAG_T *type_p)
{
	*type_p = entry_d->a_type;

	return 0;
}

/*
 * There is no way of knowing what size the ACL returned by
 * ACL_GET will be unless you first call ACL_CNT which means
 * making an additional system call.
 *
 * In the hope of avoiding the cost of the additional system
 * call in most cases, we initially allocate enough space for
 * an ACL with INITIAL_ACL_SIZE entries. If this turns out to
 * be too small then we use ACL_CNT to find out the actual
 * size, reallocate the ACL buffer, and then call ACL_GET again.
 */

#define	INITIAL_ACL_SIZE	16

SMB_ACL_T sys_acl_get_file(const char *path_p, SMB_ACL_TYPE_T type)
{
	SMB_ACL_T	acl_d;
	int		count;		/* # of ACL entries allocated	*/
	int		naccess;	/* # of access ACL entries	*/
	int		ndefault;	/* # of default ACL entries	*/

	if(hpux_acl_call_presence() == False) {
		/* Looks like we don't have the acl() system call on HPUX. 
		 * May be the system doesn't have the latest version of JFS.
		 */
		return NULL; 
	}

	if (type != SMB_ACL_TYPE_ACCESS && type != SMB_ACL_TYPE_DEFAULT) {
		errno = EINVAL;
		return NULL;
	}

	count = INITIAL_ACL_SIZE;
	if ((acl_d = sys_acl_init(count)) == NULL) {
		return NULL;
	}

	/*
	 * If there isn't enough space for the ACL entries we use
	 * ACL_CNT to determine the actual number of ACL entries
	 * reallocate and try again. This is in a loop because it
	 * is possible that someone else could modify the ACL and
	 * increase the number of entries between the call to
	 * ACL_CNT and the call to ACL_GET.
	 */
	while ((count = acl(path_p, ACL_GET, count, &acl_d->acl[0])) < 0 && errno == ENOSPC) {

		sys_acl_free_acl(acl_d);

		if ((count = acl(path_p, ACL_CNT, 0, NULL)) < 0) {
			return NULL;
		}

		if ((acl_d = sys_acl_init(count)) == NULL) {
			return NULL;
		}
	}

	if (count < 0) {
		sys_acl_free_acl(acl_d);
		return NULL;
	}

	/*
	 * calculate the number of access and default ACL entries
	 *
	 * Note: we assume that the acl() system call returned a
	 * well formed ACL which is sorted so that all of the
	 * access ACL entries preceed any default ACL entries
	 */
	for (naccess = 0; naccess < count; naccess++) {
		if (acl_d->acl[naccess].a_type & ACL_DEFAULT)
			break;
	}
	ndefault = count - naccess;
	
	/*
	 * if the caller wants the default ACL we have to copy
	 * the entries down to the start of the acl[] buffer
	 * and mask out the ACL_DEFAULT flag from the type field
	 */
	if (type == SMB_ACL_TYPE_DEFAULT) {
		int	i, j;

		for (i = 0, j = naccess; i < ndefault; i++, j++) {
			acl_d->acl[i] = acl_d->acl[j];
			acl_d->acl[i].a_type &= ~ACL_DEFAULT;
		}

		acl_d->count = ndefault;
	} else {
		acl_d->count = naccess;
	}

	return acl_d;
}

#if 0
SMB_ACL_T sys_acl_get_fd(int fd)
{
	/*
	 * HPUX doesn't have the facl call. Fake it using the path.... JRA.
	 */

	files_struct *fsp = file_find_fd(fd);

	if (fsp == NULL) {
		errno = EBADF;
		return NULL;
	}

	/*
	 * We know we're in the same conn context. So we
	 * can use the relative path.
	 */

	return sys_acl_get_file(fsp->fsp_name, SMB_ACL_TYPE_ACCESS);
}
#endif

int sys_acl_get_info(SMB_ACL_ENTRY_T entry, SMB_ACL_TAG_T *tag_type_p, uint32 *bits_p, id_t *u_g_id_p)
{
	*tag_type_p = entry->a_type;

	*bits_p = entry->a_perm;

	if (*tag_type_p == SMB_ACL_USER || *tag_type_p == SMB_ACL_GROUP)
		*u_g_id_p = entry->a_id;

	return 0;
}

SMB_ACL_T sys_acl_init(int count)
{
	SMB_ACL_T	a;

	if (count < 0) {
		errno = EINVAL;
		return NULL;
	}

	/*
	 * note that since the definition of the structure pointed
	 * to by the SMB_ACL_T includes the first element of the
	 * acl[] array, this actually allocates an ACL with room
	 * for (count+1) entries
	 */
	if ((a = (SMB_ACL_T)SMB_MALLOC(sizeof a[0] + count * sizeof(struct acl))) == NULL) {
		errno = ENOMEM;
		return NULL;
	}

	a->size = count + 1;
	a->count = 0;
	a->next = -1;

	return a;
}


int sys_acl_create_entry(SMB_ACL_T *acl_p, SMB_ACL_ENTRY_T *entry_p)
{
	SMB_ACL_T	acl_d;
	SMB_ACL_ENTRY_T	entry_d;

	if (acl_p == NULL || entry_p == NULL || (acl_d = *acl_p) == NULL) {
		errno = EINVAL;
		return -1;
	}

	if (acl_d->count >= acl_d->size) {
		errno = ENOSPC;
		return -1;
	}

	entry_d		= &acl_d->acl[acl_d->count++];
	entry_d->a_type	= 0;
	entry_d->a_id	= -1;
	entry_d->a_perm	= 0;
	*entry_p	= entry_d;

	return 0;
}

int sys_acl_set_info(SMB_ACL_ENTRY_T entry, SMB_ACL_TAG_T tag_type, uint32 bits, id_t u_g_id)
{
	entry->a_type = tag_type;

	if (tag_type == SMB_ACL_USER || tag_type == SMB_ACL_GROUP)
		entry->a_id = u_g_id;

	entry->a_perm = bits;

	return 0;
}

int sys_acl_set_access_bits(SMB_ACL_ENTRY_T entry_d, uint32 bits)
{
	entry_d->a_perm = bits;

	return 0;
}

/* Structure to capture the count for each type of ACE. */

struct hpux_acl_types {
	int n_user;
	int n_def_user;
	int n_user_obj;
	int n_def_user_obj;

	int n_group;
	int n_def_group;
	int n_group_obj;
	int n_def_group_obj;

	int n_other;
	int n_other_obj;
	int n_def_other_obj;

	int n_class_obj;
	int n_def_class_obj;

	int n_illegal_obj;
};

/* count_obj:
 * Counts the different number of objects in a given array of ACL
 * structures.
 * Inputs:
 *
 * acl_count      - Count of ACLs in the array of ACL strucutres.