571 lines
16 KiB
C
571 lines
16 KiB
C
/* setfacl.c
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Copyright 2000, 2001, 2002, 2003, 2006, 2008, 2009, 2010, 2011 Red Hat Inc.
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Written by Corinna Vinschen <vinschen@redhat.com>
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <pwd.h>
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#include <grp.h>
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#include <sys/types.h>
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#include <sys/acl.h>
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#ifndef BOOL
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#define BOOL int
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#endif
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#ifndef TRUE
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#define TRUE (1)
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#endif
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#ifndef FALSE
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#define FALSE (0)
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#endif
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#ifndef ILLEGAL_MODE
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#define ILLEGAL_MODE ((mode_t)0xffffffff)
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#endif
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static const char version[] = "$Revision$";
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static char *prog_name;
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typedef enum {
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NoAction,
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Set,
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Modify,
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Delete,
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ModNDel,
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SetFromFile
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} action_t;
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mode_t getperm (char *in)
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{
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if (isdigit ((unsigned char) *in) && !in[1])
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{
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int i = atoi (in);
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if (i < 0 || i > 7)
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return ILLEGAL_MODE;
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return i << 6 | i << 3 | i;
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}
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if (strlen (in) > 3 && strchr (" \t\n\r#", in[3]))
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in[3] = '\0';
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if (strlen (in) != 3)
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return ILLEGAL_MODE;
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if (!strchr ("r-", in[0])
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|| !strchr ("w-", in[1])
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|| !strchr ("x-", in[2]))
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return ILLEGAL_MODE;
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return (in[0] == 'r' ? S_IROTH : 0)
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| (in[1] == 'w' ? S_IWOTH : 0)
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| (in[2] == 'x' ? S_IXOTH : 0);
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}
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BOOL
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getaclentry (action_t action, char *c, aclent_t *ace)
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{
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char *c2;
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ace->a_type = 0;
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ace->a_id = (uid_t) -1;
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ace->a_perm = 0;
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/* First, check if we're handling a default entry. */
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if (!strncmp (c, "default:", 8) || !strncmp (c, "d:", 2))
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{
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ace->a_type = ACL_DEFAULT;
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c = strchr (c, ':') + 1;
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}
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/* c now points to the type. Check for next colon. If we find a colon,
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NUL it. Otherwise the string is invalid, except when deleting. */
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c2 = strchrnul (c, ':');
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if (*c2 == ':')
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*c2++ = '\0';
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else if (action != Delete)
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return FALSE;
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/* Fetch the type. */
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if (!strcmp (c, "u") || !strcmp (c, "user"))
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ace->a_type |= USER_OBJ;
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else if (!strcmp (c, "g") || !strcmp (c, "group"))
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ace->a_type |= GROUP_OBJ;
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else if (!strcmp (c, "m") || !strcmp (c, "mask"))
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ace->a_type |= CLASS_OBJ;
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else if (!strcmp (c, "o") || !strcmp (c, "other"))
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ace->a_type |= OTHER_OBJ;
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else
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return FALSE;
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/* Skip to next field. */
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c = c2;
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if (!*c && action != Delete)
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return FALSE;
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/* If this is a user or group entry, check if next char is a colon char.
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If so, skip it, otherwise it's the name of a user or group. */
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if (!(ace->a_type & (USER_OBJ | GROUP_OBJ)))
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;
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else if (*c == ':')
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++c;
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else if (*c)
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{
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/* c now points to the id. Check for next colon. If we find a colon,
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NUL it. Otherwise the string is invalid, except when deleting.
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If we delete, it must be a default entry since standard ugo entries
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can't be deleted. */
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c2 = strchrnul (c + 1, ':');
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if (*c2 == ':')
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*c2++ = '\0';
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else if (action != Delete)
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return FALSE;
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else if (!(ace->a_type & ACL_DEFAULT))
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return FALSE;
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/* Fetch user/group id. */
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if (isdigit ((unsigned char) *c))
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{
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char *c3;
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ace->a_id = strtol (c, &c3, 10);
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if (*c3)
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return FALSE;
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}
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else if (ace->a_type & USER_OBJ)
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{
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struct passwd *pw = getpwnam (c);
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if (!pw)
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return FALSE;
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ace->a_id = pw->pw_uid;
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}
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else
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{
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struct group *gr = getgrnam (c);
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if (!gr)
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return FALSE;
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ace->a_id = gr->gr_gid;
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}
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if (ace->a_type & USER_OBJ)
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{
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ace->a_type &= ~USER_OBJ;
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ace->a_type |= USER;
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}
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else
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{
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ace->a_type &= ~GROUP_OBJ;
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ace->a_type |= GROUP;
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}
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/* Skip to next field. */
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c = c2;
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}
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if (action == Delete)
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{
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/* Trailing garbage? */
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if (*c)
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return FALSE;
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/* No, we're good. */
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ace->a_perm = ILLEGAL_MODE;
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return TRUE;
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}
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/* Check perms. */
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if ((ace->a_perm = getperm (c)) == ILLEGAL_MODE)
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return FALSE;
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return TRUE;
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}
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BOOL
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getaclentries (action_t action, char *buf, aclent_t *acls, int *idx)
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{
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char *c;
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if (action == SetFromFile)
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{
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FILE *fp;
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char fbuf[256], *fb;
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if (!strcmp (buf, "-"))
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fp = stdin;
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else if (! (fp = fopen (buf, "r")))
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return FALSE;
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while ((fb = fgets (fbuf, 256, fp)))
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{
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while (strchr (" \t", *fb))
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++fb;
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if (strchr ("\n\r#", *fb))
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continue;
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if (!getaclentry (action, fb, acls + (*idx)++))
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{
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fclose (fp);
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return FALSE;
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}
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}
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if (fp != stdin)
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fclose (fp);
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}
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else
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for (c = strtok (buf, ","); c; c = strtok (NULL, ","))
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if (!getaclentry (action, c, acls + (*idx)++))
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return FALSE;
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return TRUE;
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}
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int
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searchace (aclent_t *aclp, int nentries, int type, int id)
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{
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int i;
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for (i = 0; i < nentries; ++i)
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if ((aclp[i].a_type == type && (id < 0 || aclp[i].a_id == id))
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|| !aclp[i].a_type)
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return i;
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return -1;
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}
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int
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modacl (aclent_t *tgt, int tcnt, aclent_t *src, int scnt)
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{
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int t, s, i;
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for (s = 0; s < scnt; ++s)
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{
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t = searchace (tgt, MAX_ACL_ENTRIES, src[s].a_type,
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(src[s].a_type & (USER | GROUP)) ? src[s].a_id : -1);
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if (t < 0)
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return -1;
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if (src[s].a_perm == ILLEGAL_MODE)
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{
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if (t < tcnt)
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{
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for (i = t + 1; i < tcnt; ++i)
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tgt[i - 1] = tgt[i];
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--tcnt;
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}
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}
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else
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{
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tgt[t] = src[s];
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if (t >= tcnt)
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++tcnt;
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}
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}
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return tcnt;
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}
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int
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setfacl (action_t action, char *path, aclent_t *acls, int cnt)
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{
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aclent_t lacl[MAX_ACL_ENTRIES];
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int lcnt;
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memset (lacl, 0, sizeof lacl);
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if (action == Set)
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{
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if (acl (path, SETACL, cnt, acls))
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{
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perror (prog_name);
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return 2;
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}
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}
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else if ((lcnt = acl (path, GETACL, MAX_ACL_ENTRIES, lacl)) < 0
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|| (lcnt = modacl (lacl, lcnt, acls, cnt)) < 0
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|| (lcnt = acl (path, SETACL, lcnt, lacl)) < 0)
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{
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perror (prog_name);
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return 2;
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}
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return 0;
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}
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static void
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usage (FILE * stream)
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{
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fprintf (stream, ""
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"Usage: %s [-r] (-f ACL_FILE | -s acl_entries) FILE...\n"
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" %s [-r] ([-d acl_entries] [-m acl_entries]) FILE...\n"
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"Modify file and directory access control lists (ACLs)\n"
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"\n"
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" -d, --delete delete one or more specified ACL entries\n"
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" -f, --file set ACL entries for FILE to ACL entries read\n"
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" from a ACL_FILE\n"
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" -m, --modify modify one or more specified ACL entries\n"
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" -r, --replace replace mask entry with maximum permissions\n"
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" needed for the file group class\n"
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" -s, --substitute substitute specified ACL entries for the\n"
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" ACL of FILE\n"
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" -h, --help output usage information and exit\n"
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" -v, --version output version information and exit\n"
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"\n"
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"At least one of (-d, -f, -m, -s) must be specified\n"
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"\n"
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"", prog_name, prog_name);
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if (stream == stdout)
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{
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printf(""
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" Acl_entries are one or more comma-separated ACL entries \n"
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" from the following list:\n"
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"\n"
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" u[ser]::perm\n"
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" u[ser]:uid:perm\n"
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" g[roup]::perm\n"
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" g[roup]:gid:perm\n"
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" m[ask]:perm\n"
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" o[ther]:perm\n"
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"\n"
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" Default entries are like the above with the additional\n"
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" default identifier. For example: \n"
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"\n"
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" d[efault]:u[ser]:uid:perm\n"
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"\n"
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" 'perm' is either a 3-char permissions string in the form\n"
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" \"rwx\" with the character - for no permission\n"
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" or it is the octal representation of the permissions, a\n"
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" value from 0 (equivalent to \"---\") to 7 (\"rwx\").\n"
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" 'uid' is a user name or a numerical uid.\n"
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" 'gid' is a group name or a numerical gid.\n"
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"\n"
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"\n"
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"For each file given as parameter, %s will either replace its\n"
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"complete ACL (-s, -f), or it will add, modify, or delete ACL\n"
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"entries.\n"
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"\n"
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"The following options are supported:\n"
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"\n"
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"-d Delete one or more specified entries from the file's ACL.\n"
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" The owner, group and others entries must not be deleted.\n"
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" Acl_entries to be deleted should be specified without\n"
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" permissions, as in the following list:\n"
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"\n"
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" u[ser]:uid\n"
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" g[roup]:gid\n"
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" d[efault]:u[ser]:uid\n"
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" d[efault]:g[roup]:gid\n"
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" d[efault]:m[ask]:\n"
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" d[efault]:o[ther]:\n"
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"\n"
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"-f Take the Acl_entries from ACL_FILE one per line. Whitespace\n"
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" characters are ignored, and the character \"#\" may be used\n"
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" to start a comment. The special filename \"-\" indicates\n"
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" reading from stdin.\n"
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" Required entries are\n"
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" - One user entry for the owner of the file.\n"
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" - One group entry for the group of the file.\n"
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" - One other entry.\n"
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" If additional user and group entries are given:\n"
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" - A mask entry for the file group class of the file.\n"
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" - No duplicate user or group entries with the same uid/gid.\n"
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" If it is a directory:\n"
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" - One default user entry for the owner of the file.\n"
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" - One default group entry for the group of the file.\n"
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" - One default mask entry for the file group class.\n"
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" - One default other entry.\n"
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"\n"
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"-m Add or modify one or more specified ACL entries.\n"
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" Acl_entries is a comma-separated list of entries from the \n"
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" same list as above.\n"
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"\n"
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"-r Causes the permissions specified in the mask entry to be\n"
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" ignored and replaced by the maximum permissions needed for\n"
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" the file group class.\n"
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"\n"
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"-s Like -f, but substitute the file's ACL with Acl_entries\n"
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" specified in a comma-separated list on the command line.\n"
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"\n"
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"While the -d and -m options may be used in the same command, the\n"
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"-f and -s options may be used only exclusively.\n"
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"\n"
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"Directories may contain default ACL entries. Files created\n"
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"in a directory that contains default ACL entries will have\n"
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"permissions according to the combination of the current umask,\n"
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"the explicit permissions requested and the default ACL entries\n"
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"Note: Under Cygwin, the default ACL entries are not taken into\n"
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"account currently.\n", prog_name);
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}
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else
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fprintf(stream, "Try '%s --help' for more information.\n", prog_name);
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}
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struct option longopts[] = {
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{"delete", required_argument, NULL, 'd'},
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{"file", required_argument, NULL, 'f'},
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{"modify", required_argument, NULL, 'm'},
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{"replace", no_argument, NULL, 'r'},
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{"substitute", required_argument, NULL, 's'},
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{"help", no_argument, NULL, 'h'},
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{"version", no_argument, NULL, 'v'},
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{0, no_argument, NULL, 0}
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};
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static void
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print_version ()
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{
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const char *v = strchr (version, ':');
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int len;
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if (!v)
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{
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v = "?";
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len = 1;
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}
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else
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{
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v += 2;
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len = strchr (v, ' ') - v;
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}
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printf ("\
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setfacl (cygwin) %.*s\n\
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ACL Modification Utility\n\
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Copyright 2000, 2001, 2002 Red Hat, Inc.\n\
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Compiled on %s\n\
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", len, v, __DATE__);
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}
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int
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main (int argc, char **argv)
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{
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int c;
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action_t action = NoAction;
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int ropt = 0;
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aclent_t acls[MAX_ACL_ENTRIES];
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int aclidx = 0;
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int ret = 0;
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prog_name = strrchr (argv[0], '/');
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if (prog_name == NULL)
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prog_name = strrchr (argv[0], '\\');
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if (prog_name == NULL)
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prog_name = argv[0];
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else
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prog_name++;
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memset (acls, 0, sizeof acls);
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while ((c = getopt_long (argc, argv, "d:f:hm:rs:v", longopts, NULL)) != EOF)
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switch (c)
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{
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case 'd':
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if (action == NoAction)
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action = Delete;
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else if (action == Modify)
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action = ModNDel;
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else
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{
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usage (stderr);
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return 1;
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}
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if (! getaclentries (Delete, optarg, acls, &aclidx))
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{
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fprintf (stderr, "%s: illegal acl entries\n", prog_name);
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return 2;
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}
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break;
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case 'f':
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if (action == NoAction)
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action = Set;
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else
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{
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usage (stderr);
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return 1;
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}
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if (! getaclentries (SetFromFile, optarg, acls, &aclidx))
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{
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fprintf (stderr, "%s: illegal acl entries\n", prog_name);
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return 2;
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}
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break;
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case 'h':
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usage (stdout);
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return 0;
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case 'm':
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if (action == NoAction)
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action = Modify;
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else if (action == Delete)
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action = ModNDel;
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else
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{
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usage (stderr);
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return 1;
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}
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if (! getaclentries (Modify, optarg, acls, &aclidx))
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{
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fprintf (stderr, "%s: illegal acl entries\n", prog_name);
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return 2;
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}
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break;
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case 'r':
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if (!ropt)
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ropt = 1;
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else
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{
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usage (stderr);
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return 1;
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}
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break;
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case 's':
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if (action == NoAction)
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action = Set;
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else
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{
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usage (stderr);
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return 1;
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}
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if (! getaclentries (Set, optarg, acls, &aclidx))
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{
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fprintf (stderr, "%s: illegal acl entries\n", prog_name);
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return 2;
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}
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break;
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case 'v':
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print_version ();
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return 0;
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default:
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usage (stderr);
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return 1;
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}
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if (action == NoAction)
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{
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usage (stderr);
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return 1;
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}
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if (optind > argc - 1)
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{
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|
usage (stderr);
|
|
return 1;
|
|
}
|
|
if (action == Set)
|
|
switch (aclcheck (acls, aclidx, NULL))
|
|
{
|
|
case GRP_ERROR:
|
|
fprintf (stderr, "%s: more than one group entry.\n", prog_name);
|
|
return 2;
|
|
case USER_ERROR:
|
|
fprintf (stderr, "%s: more than one user entry.\n", prog_name);
|
|
return 2;
|
|
case CLASS_ERROR:
|
|
fprintf (stderr, "%s: more than one mask entry.\n", prog_name);
|
|
return 2;
|
|
case OTHER_ERROR:
|
|
fprintf (stderr, "%s: more than one other entry.\n", prog_name);
|
|
return 2;
|
|
case DUPLICATE_ERROR:
|
|
fprintf (stderr, "%s: duplicate additional user or group.\n", prog_name);
|
|
return 2;
|
|
case ENTRY_ERROR:
|
|
fprintf (stderr, "%s: invalid entry type.\n", prog_name);
|
|
return 2;
|
|
case MISS_ERROR:
|
|
fprintf (stderr, "%s: missing entries.\n", prog_name);
|
|
return 2;
|
|
case MEM_ERROR:
|
|
fprintf (stderr, "%s: out of memory.\n", prog_name);
|
|
return 2;
|
|
default:
|
|
break;
|
|
}
|
|
for (c = optind; c < argc; ++c)
|
|
ret |= setfacl (action, argv[c], acls, aclidx);
|
|
return ret;
|
|
}
|