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newlib/winsup/utils/setfacl.c

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/* setfacl.c
Copyright 2000, 2001, 2002, 2003, 2006, 2008, 2009, 2010, 2011, 2014
Red Hat Inc.
Written by Corinna Vinschen <vinschen@redhat.com>
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include <errno.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#include <pwd.h>
#include <grp.h>
#include <sys/types.h>
#include <sys/acl.h>
#include <cygwin/version.h>
#ifndef BOOL
#define BOOL int
#endif
#ifndef TRUE
#define TRUE (1)
#endif
#ifndef FALSE
#define FALSE (0)
#endif
#ifndef ILLEGAL_MODE
#define ILLEGAL_MODE ((mode_t)0xffffffff)
#endif
static char *prog_name;
typedef enum {
NoAction,
Set,
Modify,
Delete,
ModNDel,
SetFromFile
} action_t;
mode_t getperm (char *in)
{
if (isdigit ((unsigned char) *in) && !in[1])
{
int i = atoi (in);
if (i < 0 || i > 7)
return ILLEGAL_MODE;
return i << 6 | i << 3 | i;
}
if (strlen (in) > 3 && strchr (" \t\n\r#", in[3]))
in[3] = '\0';
if (strlen (in) != 3)
return ILLEGAL_MODE;
if (!strchr ("r-", in[0])
|| !strchr ("w-", in[1])
|| !strchr ("x-", in[2]))
return ILLEGAL_MODE;
return (in[0] == 'r' ? S_IROTH : 0)
| (in[1] == 'w' ? S_IWOTH : 0)
| (in[2] == 'x' ? S_IXOTH : 0);
}
BOOL
getaclentry (action_t action, char *c, aclent_t *ace)
{
char *c2;
ace->a_type = 0;
ace->a_id = (uid_t) -1;
ace->a_perm = 0;
/* First, check if we're handling a default entry. */
if (!strncmp (c, "default:", 8) || !strncmp (c, "d:", 2))
{
ace->a_type = ACL_DEFAULT;
c = strchr (c, ':') + 1;
}
/* c now points to the type. Check for next colon. If we find a colon,
NUL it. Otherwise the string is invalid, except when deleting. */
c2 = strchrnul (c, ':');
if (*c2 == ':')
*c2++ = '\0';
else if (action != Delete)
return FALSE;
/* Fetch the type. */
if (!strcmp (c, "u") || !strcmp (c, "user"))
ace->a_type |= USER_OBJ;
else if (!strcmp (c, "g") || !strcmp (c, "group"))
ace->a_type |= GROUP_OBJ;
else if (!strcmp (c, "m") || !strcmp (c, "mask"))
ace->a_type |= CLASS_OBJ;
else if (!strcmp (c, "o") || !strcmp (c, "other"))
ace->a_type |= OTHER_OBJ;
else
return FALSE;
/* Skip to next field. */
c = c2;
if (!*c)
{
/* Nothing follows. This is only valid if action is Delete and the
type is CLASS_OBJ, or if ACL_DEFAULT is set. */
if (action != Delete
|| (!(ace->a_type & (CLASS_OBJ | ACL_DEFAULT))))
return FALSE;
}
else if (!(ace->a_type & (USER_OBJ | GROUP_OBJ)))
{
/* Mask and other entries may contain an extra colon. */
if (*c == ':')
++c;
}
/* If this is a user or group entry, check if next char is a colon char.
If so, skip it, otherwise it's the name of a user or group. */
else if (*c == ':')
++c;
else if (*c)
{
/* c now points to the id. Check for next colon. If we find a colon,
NUL it. Otherwise the string is invalid, except when deleting.
If we delete, it must be a default entry since standard ugo entries
can't be deleted. */
c2 = strchrnul (c + 1, ':');
if (*c2 == ':')
*c2++ = '\0';
else if (action != Delete)
return FALSE;
/* Fetch user/group id. */
if (isdigit ((unsigned char) *c))
{
char *c3;
ace->a_id = strtol (c, &c3, 10);
if (*c3)
return FALSE;
}
else if (ace->a_type & USER_OBJ)
{
struct passwd *pw = getpwnam (c);
if (!pw)
return FALSE;
ace->a_id = pw->pw_uid;
}
else
{
struct group *gr = getgrnam (c);
if (!gr)
return FALSE;
ace->a_id = gr->gr_gid;
}
if (ace->a_type & USER_OBJ)
{
ace->a_type &= ~USER_OBJ;
ace->a_type |= USER;
}
else
{
ace->a_type &= ~GROUP_OBJ;
ace->a_type |= GROUP;
}
/* Skip to next field. */
c = c2;
}
if (action == Delete)
{
/* Trailing garbage? */
if (*c)
return FALSE;
/* No, we're good. */
ace->a_perm = ILLEGAL_MODE;
return TRUE;
}
/* Check perms. */
if ((ace->a_perm = getperm (c)) == ILLEGAL_MODE)
return FALSE;
return TRUE;
}
BOOL
getaclentries (action_t action, char *buf, aclent_t *acls, int *idx)
{
char *c;
if (action == SetFromFile)
{
FILE *fp;
char fbuf[256], *fb;
if (!strcmp (buf, "-"))
fp = stdin;
else if (! (fp = fopen (buf, "r")))
return FALSE;
while ((fb = fgets (fbuf, 256, fp)))
{
while (strchr (" \t", *fb))
++fb;
if (strchr ("\n\r#", *fb))
continue;
if (!getaclentry (action, fb, acls + (*idx)++))
{
fclose (fp);
return FALSE;
}
}
if (fp != stdin)
fclose (fp);
}
else
for (c = strtok (buf, ","); c; c = strtok (NULL, ","))
if (!getaclentry (action, c, acls + (*idx)++))
return FALSE;
return TRUE;
}
int
searchace (aclent_t *aclp, int nentries, int type, int id)
{
int i;
for (i = 0; i < nentries; ++i)
if ((aclp[i].a_type == type && (id < 0 || aclp[i].a_id == id))
|| !aclp[i].a_type)
return i;
return -1;
}
int
modacl (aclent_t *tgt, int tcnt, aclent_t *src, int scnt)
{
int t, s, i;
for (s = 0; s < scnt; ++s)
{
t = searchace (tgt, MAX_ACL_ENTRIES, src[s].a_type,
(src[s].a_type & (USER | GROUP)) ? src[s].a_id : -1);
if (t < 0)
return -1;
if (src[s].a_perm == ILLEGAL_MODE)
{
if (t < tcnt)
{
for (i = t + 1; i < tcnt; ++i)
tgt[i - 1] = tgt[i];
--tcnt;
}
}
else
{
tgt[t] = src[s];
if (t >= tcnt)
++tcnt;
}
}
return tcnt;
}
int
addmissing (aclent_t *tgt, int tcnt)
{
int t;
int types = 0, def_types = 0;
int perm = 0, def_perm = 0;
/* Check if we have all the required entries now. */
for (t = 0; t < tcnt; ++t)
if (tgt[t].a_type & ACL_DEFAULT)
{
def_types |= tgt[t].a_type;
if (tgt[t].a_type & (USER | GROUP | GROUP_OBJ))
def_perm |= tgt[t].a_perm;
}
else
{
types |= tgt[t].a_type;
if (tgt[t].a_type & (USER | GROUP | GROUP_OBJ))
perm |= tgt[t].a_perm;
}
/* Add missing CLASS_OBJ */
if ((types & (USER | GROUP)) && !(types & CLASS_OBJ))
{
tgt[tcnt].a_type = CLASS_OBJ;
tgt[tcnt].a_id = (uid_t) -1;
tgt[tcnt++].a_perm = perm;
}
if (def_types)
{
/* Add missing default entries. */
if (!(def_types & USER_OBJ) && tcnt < MAX_ACL_ENTRIES)
{
t = searchace (tgt, tcnt, USER_OBJ, -1);
tgt[tcnt].a_type = DEF_USER_OBJ;
tgt[tcnt].a_id = (uid_t) -1;
tgt[tcnt++].a_perm = t >= 0 ? tgt[t].a_perm : S_IRWXO;
}
if (!(def_types & GROUP_OBJ) && tcnt < MAX_ACL_ENTRIES)
{
t = searchace (tgt, tcnt, GROUP_OBJ, -1);
tgt[tcnt].a_type = DEF_GROUP_OBJ;
tgt[tcnt].a_id = (uid_t) -1;
tgt[tcnt].a_perm = t >= 0 ? tgt[t].a_perm : (S_IROTH | S_IXOTH);
def_perm |= tgt[tcnt++].a_perm;
}
if (!(def_types & OTHER_OBJ) && tcnt < MAX_ACL_ENTRIES)
{
t = searchace (tgt, tcnt, OTHER_OBJ, -1);
tgt[tcnt].a_type = DEF_OTHER_OBJ;
tgt[tcnt].a_id = (uid_t) -1;
tgt[tcnt++].a_perm = t >= 0 ? tgt[t].a_perm : (S_IROTH | S_IXOTH);
}
/* Add missing DEF_CLASS_OBJ */
if ((def_types & (USER | GROUP)) && !(def_types & CLASS_OBJ))
{
tgt[tcnt].a_type = DEF_CLASS_OBJ;
tgt[tcnt].a_id = (uid_t) -1;
tgt[tcnt++].a_perm = def_perm;
}
}
return tcnt;
}
int
setfacl (action_t action, char *path, aclent_t *acls, int cnt)
{
aclent_t lacl[MAX_ACL_ENTRIES];
int lcnt;
memset (lacl, 0, sizeof lacl);
if (action == Set)
{
if (acl (path, SETACL, cnt, acls))
{
perror (prog_name);
return 2;
}
}
else if ((lcnt = acl (path, GETACL, MAX_ACL_ENTRIES, lacl)) < 0
|| (lcnt = modacl (lacl, lcnt, acls, cnt)) < 0
|| (action != Delete && (lcnt = addmissing (lacl, lcnt)) < 0)
|| (lcnt = acl (path, SETACL, lcnt, lacl)) < 0)
{
perror (prog_name);
return 2;
}
return 0;
}
static void
usage (FILE * stream)
{
fprintf (stream, ""
"Usage: %s [-r] (-f ACL_FILE | -s acl_entries) FILE...\n"
" %s [-r] ([-d acl_entries] [-m acl_entries]) FILE...\n"
"\n"
"Modify file and directory access control lists (ACLs)\n"
"\n"
" -d, --delete delete one or more specified ACL entries\n"
" -f, --file set ACL entries for FILE to ACL entries read\n"
" from a ACL_FILE\n"
" -m, --modify modify one or more specified ACL entries\n"
" -r, --replace replace mask entry with maximum permissions\n"
" needed for the file group class\n"
" -s, --substitute substitute specified ACL entries for the\n"
" ACL of FILE\n"
" -h, --help output usage information and exit\n"
" -V, --version output version information and exit\n"
"\n"
"At least one of (-d, -f, -m, -s) must be specified\n"
"\n", prog_name, prog_name);
if (stream == stdout)
{
printf(""
" Acl_entries are one or more comma-separated ACL entries \n"
" from the following list:\n"
"\n"
" u[ser]::perm\n"
" u[ser]:uid:perm\n"
" g[roup]::perm\n"
" g[roup]:gid:perm\n"
" m[ask]:perm\n"
" o[ther]:perm\n"
"\n"
" Default entries are like the above with the additional\n"
" default identifier. For example: \n"
"\n"
" d[efault]:u[ser]:uid:perm\n"
"\n"
" 'perm' is either a 3-char permissions string in the form\n"
" \"rwx\" with the character - for no permission\n"
" or it is the octal representation of the permissions, a\n"
" value from 0 (equivalent to \"---\") to 7 (\"rwx\").\n"
" 'uid' is a user name or a numerical uid.\n"
" 'gid' is a group name or a numerical gid.\n"
"\n"
"\n"
"For each file given as parameter, %s will either replace its\n"
"complete ACL (-s, -f), or it will add, modify, or delete ACL\n"
"entries.\n"
"\n"
"The following options are supported:\n"
"\n"
"-d Delete one or more specified entries from the file's ACL.\n"
" The owner, group and others entries must not be deleted.\n"
" Acl_entries to be deleted should be specified without\n"
" permissions, as in the following list:\n"
"\n"
" u[ser]:uid[:]\n"
" g[roup]:gid[:]\n"
" m[ask][:]\n"
" d[efault]:u[ser][:uid]\n"
" d[efault]:g[roup][:gid]\n"
" d[efault]:m[ask][:]\n"
" d[efault]:o[ther][:]\n"
"\n"
"-f Take the Acl_entries from ACL_FILE one per line. Whitespace\n"
" characters are ignored, and the character \"#\" may be used\n"
" to start a comment. The special filename \"-\" indicates\n"
" reading from stdin.\n"
" Required entries are\n"
" - One user entry for the owner of the file.\n"
" - One group entry for the group of the file.\n"
" - One other entry.\n"
" If additional user and group entries are given:\n"
" - A mask entry for the file group class of the file.\n"
" - No duplicate user or group entries with the same uid/gid.\n"
" If it is a directory:\n"
" - One default user entry for the owner of the file.\n"
" - One default group entry for the group of the file.\n"
" - One default mask entry for the file group class.\n"
" - One default other entry.\n"
"\n"
"-m Add or modify one or more specified ACL entries.\n"
" Acl_entries is a comma-separated list of entries from the \n"
" same list as above.\n"
"\n"
"-r Causes the permissions specified in the mask entry to be\n"
" ignored and replaced by the maximum permissions needed for\n"
" the file group class.\n"
"\n"
"-s Like -f, but substitute the file's ACL with Acl_entries\n"
" specified in a comma-separated list on the command line.\n"
"\n"
"While the -d and -m options may be used in the same command, the\n"
"-f and -s options may be used only exclusively.\n"
"\n"
"Directories may contain default ACL entries. Files created\n"
"in a directory that contains default ACL entries will have\n"
"permissions according to the combination of the current umask,\n"
"the explicit permissions requested and the default ACL entries\n"
"\n", prog_name);
}
else
fprintf(stream, "Try '%s --help' for more information.\n", prog_name);
}
struct option longopts[] = {
{"delete", required_argument, NULL, 'd'},
{"file", required_argument, NULL, 'f'},
{"modify", required_argument, NULL, 'm'},
{"replace", no_argument, NULL, 'r'},
{"substitute", required_argument, NULL, 's'},
{"help", no_argument, NULL, 'h'},
{"version", no_argument, NULL, 'V'},
{0, no_argument, NULL, 0}
};
const char *opts = "d:f:hm:rs:V";
static void
print_version ()
{
printf ("setfacl (cygwin) %d.%d.%d\n"
"POSIX ACL modification utility\n"
"Copyright (C) 2000 - %s Red Hat, Inc.\n"
"This is free software; see the source for copying conditions. There is NO\n"
"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n",
CYGWIN_VERSION_DLL_MAJOR / 1000,
CYGWIN_VERSION_DLL_MAJOR % 1000,
CYGWIN_VERSION_DLL_MINOR,
strrchr (__DATE__, ' ') + 1);
}
int
main (int argc, char **argv)
{
int c;
action_t action = NoAction;
int ropt = 0;
aclent_t acls[MAX_ACL_ENTRIES];
int aclidx = 0;
int ret = 0;
prog_name = program_invocation_short_name;
memset (acls, 0, sizeof acls);
while ((c = getopt_long (argc, argv, opts, longopts, NULL)) != EOF)
switch (c)
{
case 'd':
if (action == NoAction)
action = Delete;
else if (action == Modify)
action = ModNDel;
else
{
usage (stderr);
return 1;
}
if (! getaclentries (Delete, optarg, acls, &aclidx))
{
fprintf (stderr, "%s: illegal acl entries\n", prog_name);
return 2;
}
break;
case 'f':
if (action == NoAction)
action = Set;
else
{
usage (stderr);
return 1;
}
if (! getaclentries (SetFromFile, optarg, acls, &aclidx))
{
fprintf (stderr, "%s: illegal acl entries\n", prog_name);
return 2;
}
break;
case 'h':
usage (stdout);
return 0;
case 'm':
if (action == NoAction)
action = Modify;
else if (action == Delete)
action = ModNDel;
else
{
usage (stderr);
return 1;
}
if (! getaclentries (Modify, optarg, acls, &aclidx))
{
fprintf (stderr, "%s: illegal acl entries\n", prog_name);
return 2;
}
break;
case 'r':
if (!ropt)
ropt = 1;
else
{
usage (stderr);
return 1;
}
break;
case 's':
if (action == NoAction)
action = Set;
else
{
usage (stderr);
return 1;
}
if (! getaclentries (Set, optarg, acls, &aclidx))
{
fprintf (stderr, "%s: illegal acl entries\n", prog_name);
return 2;
}
break;
case 'V':
print_version ();
return 0;
default:
fprintf (stderr, "Try `%s --help' for more information.\n", prog_name);
return 1;
}
if (action == NoAction)
{
usage (stderr);
return 1;
}
if (optind > argc - 1)
{
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;
}
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