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/*++
/* NAME
/* dict_unix 3
/* SUMMARY
/* dictionary manager interface to UNIX tables
/* SYNOPSIS
/* #include <dict_unix.h>
/*
/* DICT *dict_unix_open(map, dummy, dict_flags)
/* const char *map;
/* int dummy;
/* int dict_flags;
/* DESCRIPTION
/* dict_unix_open() makes the specified UNIX table accessible via
/* the generic dictionary operations described in dict_open(3).
/* The \fIdummy\fR argument is not used.
/*
/* Known map names:
/* .IP passwd.byname
/* The table is the UNIX password database. The key is a login name.
/* The result is a password file entry in passwd(5) format.
/* .IP group.byname
/* The table is the UNIX group database. The key is a group name.
/* The result is a group file entry in group(5) format.
/* SEE ALSO
/* dict(3) generic dictionary manager
/* DIAGNOSTICS
/* Fatal errors: out of memory, unknown map name, attempt to update map.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System library. */
#include "sys_defs.h"
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <pwd.h>
#include <grp.h>
/* Utility library. */
#include "msg.h"
#include "mymalloc.h"
#include "vstring.h"
#include "stringops.h"
#include "dict.h"
#include "dict_unix.h"
/* Application-specific. */
typedef struct {
DICT dict; /* generic members */
} DICT_UNIX;
/* dict_unix_getpwnam - find password table entry */
static const char *dict_unix_getpwnam(DICT *dict, const char *key)
{
struct passwd *pwd;
static VSTRING *buf;
static int sanity_checked;
dict->error = 0;
/*
* Optionally fold the key.
*/
if (dict->flags & DICT_FLAG_FOLD_FIX) {
if (dict->fold_buf == 0)
dict->fold_buf = vstring_alloc(10);
vstring_strcpy(dict->fold_buf, key);
key = lowercase(vstring_str(dict->fold_buf));
}
if ((pwd = getpwnam(key)) == 0) {
if (sanity_checked == 0) {
sanity_checked = 1;
errno = 0;
if (getpwuid(0) == 0) {
msg_warn("cannot access UNIX password database: %m");
dict->error = DICT_ERR_RETRY;
}
}
return (0);
} else {
if (buf == 0)
buf = vstring_alloc(10);
sanity_checked = 1;
vstring_sprintf(buf, "%s:%s:%ld:%ld:%s:%s:%s",
pwd->pw_name, pwd->pw_passwd, (long) pwd->pw_uid,
(long) pwd->pw_gid, pwd->pw_gecos, pwd->pw_dir,
pwd->pw_shell);
return (vstring_str(buf));
}
}
/* dict_unix_getgrnam - find group table entry */
static const char *dict_unix_getgrnam(DICT *dict, const char *key)
{
struct group *grp;
static VSTRING *buf;
char **cpp;
static int sanity_checked;
dict->error = 0;
/*
* Optionally fold the key.
*/
if (dict->flags & DICT_FLAG_FOLD_FIX) {
if (dict->fold_buf == 0)
dict->fold_buf = vstring_alloc(10);
vstring_strcpy(dict->fold_buf, key);
key = lowercase(vstring_str(dict->fold_buf));
}
if ((grp = getgrnam(key)) == 0) {
if (sanity_checked == 0) {
sanity_checked = 1;
errno = 0;
if (getgrgid(0) == 0) {
msg_warn("cannot access UNIX group database: %m");
dict->error = DICT_ERR_RETRY;
}
}
return (0);
} else {
if (buf == 0)
buf = vstring_alloc(10);
sanity_checked = 1;
vstring_sprintf(buf, "%s:%s:%ld:",
grp->gr_name, grp->gr_passwd, (long) grp->gr_gid);
for (cpp = grp->gr_mem; *cpp; cpp++) {
vstring_strcat(buf, *cpp);
if (cpp[1])
VSTRING_ADDCH(buf, ',');
}
VSTRING_TERMINATE(buf);
return (vstring_str(buf));
}
}
/* dict_unix_close - close UNIX map */
static void dict_unix_close(DICT *dict)
{
if (dict->fold_buf)
vstring_free(dict->fold_buf);
dict_free(dict);
}
/* dict_unix_open - open UNIX map */
DICT *dict_unix_open(const char *map, int open_flags, int dict_flags)
{
DICT_UNIX *dict_unix;
struct dict_unix_lookup {
char *name;
const char *(*lookup) (DICT *, const char *);
};
static struct dict_unix_lookup dict_unix_lookup[] = {
"passwd.byname", dict_unix_getpwnam,
"group.byname", dict_unix_getgrnam,
0,
};
struct dict_unix_lookup *lp;
/*
* Sanity checks.
*/
if (open_flags != O_RDONLY)
return (dict_surrogate(DICT_TYPE_UNIX, map, open_flags, dict_flags,
"%s:%s map requires O_RDONLY access mode",
DICT_TYPE_UNIX, map));
/*
* "Open" the database.
*/
for (lp = dict_unix_lookup; /* void */ ; lp++) {
if (lp->name == 0)
return (dict_surrogate(DICT_TYPE_UNIX, map, open_flags, dict_flags,
"unknown table: %s:%s", DICT_TYPE_UNIX, map));
if (strcmp(map, lp->name) == 0)
break;
}
dict_unix = (DICT_UNIX *) dict_alloc(DICT_TYPE_UNIX, map,
sizeof(*dict_unix));
dict_unix->dict.lookup = lp->lookup;
dict_unix->dict.close = dict_unix_close;
dict_unix->dict.flags = dict_flags | DICT_FLAG_FIXED;
if (dict_flags & DICT_FLAG_FOLD_FIX)
dict_unix->dict.fold_buf = vstring_alloc(10);
dict_unix->dict.owner.status = DICT_OWNER_TRUSTED;
return (DICT_DEBUG (&dict_unix->dict));
}
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