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libc/winsup/utils/setfacl.c

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/* setfacl.c
Copyright 2000, 2001, 2002, 2003 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 <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>
#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 const char version[] = "$Revision$";
static char *prog_name;
typedef enum {
NoAction,
Set,
Modify,
Delete,
ModNDel,
SetFromFile
} action_t;
mode_t getperm (char *in)
{
if (isdigit (*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 = -1;
ace->a_perm = 0;
if (!strncmp (c, "default:", 8)
|| !strncmp (c, "d:", 2))
{
ace->a_type = ACL_DEFAULT;
c = strchr (c, ':') + 1;
}
if (!strncmp (c, "user:", 5)
|| !strncmp (c, "u:", 2))
{
ace->a_type |= USER_OBJ;
c = strchr (c, ':') + 1;
}
else if (!strncmp (c, "group:", 6)
|| !strncmp (c, "g:", 2))
{
ace->a_type |= GROUP_OBJ;
c = strchr (c, ':') + 1;
}
else if (!strncmp (c, "mask:", 5)
|| !strncmp (c, "m:", 2))
{
ace->a_type |= CLASS_OBJ;
c = strchr (c, ':') + 1;
}
else if (!strncmp (c, "other:", 6)
|| !strncmp (c, "o:", 2))
{
ace->a_type |= OTHER_OBJ;
c = strchr (c, ':') + 1;
}
else
return FALSE;
if (ace->a_type & (USER_OBJ | GROUP_OBJ))
{
if ((c2 = strchr (c, ':')))
{
if (action == Delete)
return FALSE;
*c2 = '\0';
}
else if (action != Delete)
return FALSE;
if (c2 == c)
{
if (action == Delete)
return FALSE;
}
else if (isdigit (*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 (c2 != c)
{
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;
}
}
if (c2)
c = c2 + 1;
}
/* FIXME: currently allow both :: and : */
else if (*c == ':')
c++;
if (action == Delete)
{
if ((ace->a_type & (CLASS_OBJ | OTHER_OBJ))
&& *c)
return FALSE;
ace->a_perm = ILLEGAL_MODE;
return TRUE;
}
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;
}
void
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;
}
if ((lcnt = acl (path, GETACL, MAX_ACL_ENTRIES, lacl)) < 0
|| (lcnt = modacl (lacl, lcnt, acls, cnt)) < 0
|| (lcnt = acl (path, SETACL, lcnt, lacl)) < 0)
perror (prog_name);
}
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"
"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"
" 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"
"Note: Under Cygwin, the default ACL entries are not taken into\n"
"account currently.\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}
};
static void
print_version ()
{
const char *v = strchr (version, ':');
int len;
if (!v)
{
v = "?";
len = 1;
}
else
{
v += 2;
len = strchr (v, ' ') - v;
}
printf ("\
setfacl (cygwin) %.*s\n\
ACL Modification Utility\n\
Copyright 2000, 2001, 2002 Red Hat, Inc.\n\
Compiled on %s\n\
", len, v, __DATE__);
}
int
main (int argc, char **argv)
{
int c;
action_t action = NoAction;
int ropt = 0;
aclent_t acls[MAX_ACL_ENTRIES];
int aclidx = 0;
prog_name = strrchr (argv[0], '/');
if (prog_name == NULL)
prog_name = strrchr (argv[0], '\\');
if (prog_name == NULL)
prog_name = argv[0];
else
prog_name++;
memset (acls, 0, sizeof acls);
while ((c = getopt_long (argc, argv, "d:f:hm:rs:v", 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:
usage (stderr);
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)
setfacl (action, argv[c], acls, aclidx);
return 0;
}
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