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/*++
/* NAME
/* dict_nisplus 3
/* SUMMARY
/* dictionary manager interface to NIS+ maps
/* SYNOPSIS
/* #include <dict_nisplus.h>
/*
/* DICT *dict_nisplus_open(map, open_flags, dict_flags)
/* const char *map;
/* int dummy;
/* int dict_flags;
/* DESCRIPTION
/* dict_nisplus_open() makes the specified NIS+ map accessible via
/* the generic dictionary operations described in dict_open(3).
/* The \fIdummy\fR argument is not used.
/* SEE ALSO
/* dict(3) generic dictionary manager
/* DIAGNOSTICS
/* Fatal errors:
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Geoff Gibbs
/* UK-HGMP-RC
/* Hinxton
/* Cambridge
/* CB10 1SB, UK
/*
/* based on the code for dict_nis.c et al by :-
/*
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System library. */
#include <sys_defs.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#ifdef HAS_NISPLUS
#include <rpcsvc/nis.h> /* for nis_list */
#endif
/* Utility library. */
#include <msg.h>
#include <mymalloc.h>
#include <vstring.h>
#include <stringops.h>
#include <dict.h>
#include <dict_nisplus.h>
#ifdef HAS_NISPLUS
/* Application-specific. */
typedef struct {
DICT dict; /* generic members */
char *template; /* parsed query template */
int column; /* NIS+ field number (start at 1) */
} DICT_NISPLUS;
/*
* Begin quote from nis+(1):
*
* The following text represents a context-free grammar that defines the
* set of legal NIS+ names. The terminals in this grammar are the
* characters `.' (dot), `[' (open bracket), `]' (close bracket), `,'
* (comma), `=' (equals) and whitespace. Angle brackets (`<' and `>'),
* which delineate non- terminals, are not part of the grammar. The
* character `|' (vertical bar) is used to separate alternate productions
* and should be read as ``this production OR this production''.
*
* name ::= . | <simple name> | <indexed name>
*
* simple name ::= <string>. | <string>.<simple name>
*
* indexed name ::= <search criterion>,<simple name>
*
* search criterion ::= [ <attribute list> ]
*
* attribute list ::= <attribute> | <attribute>,<attribute list>
*
* attribute ::= <string> = <string>
*
* string ::= ISO Latin 1 character set except the character
* '/' (slash). The initial character may not be a terminal character or
* the characters '@' (at), '+' (plus), or (`-') hyphen.
*
* Terminals that appear in strings must be quoted with `"' (double quote).
* The `"' character may be quoted by quoting it with itself `""'.
*
* End quote fron nis+(1).
*
* This NIS client always quotes the entire query string (the value part of
* [attribute=value],file.domain.) so the issue with initial characters
* should not be applicable. One wonders what restrictions are applicable
* when a string is quoted, but the manual doesn't specify what can appear
* between quotes, and we don't want to get burned.
*/
/*
* SLMs.
*/
#define STR(x) vstring_str(x)
/* dict_nisplus_lookup - find table entry */
static const char *dict_nisplus_lookup(DICT *dict, const char *key)
{
const char *myname = "dict_nisplus_lookup";
DICT_NISPLUS *dict_nisplus = (DICT_NISPLUS *) dict;
static VSTRING *quoted_key;
static VSTRING *query;
static VSTRING *retval;
nis_result *reply;
int count;
const char *cp;
int last_col;
int ch;
dict->error = 0;
/*
* Initialize.
*/
if (quoted_key == 0) {
query = vstring_alloc(100);
retval = vstring_alloc(100);
quoted_key = vstring_alloc(100);
}
/*
* 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));
}
/*
* Check that the lookup key does not contain characters disallowed by
* nis+(1).
*
* XXX Many client implementations don't seem to care about disallowed
* characters.
*/
VSTRING_RESET(quoted_key);
VSTRING_ADDCH(quoted_key, '"');
for (cp = key; (ch = *(unsigned const char *) cp) != 0; cp++) {
if ((ISASCII(ch) && !ISPRINT(ch)) || (ch > 126 && ch < 160)) {
msg_warn("map %s:%s: lookup key with non-printing character 0x%x:"
" ignoring this request",
dict->type, dict->name, ch);
return (0);
} else if (ch == '"') {
VSTRING_ADDCH(quoted_key, '"');
}
VSTRING_ADDCH(quoted_key, ch);
}
VSTRING_ADDCH(quoted_key, '"');
VSTRING_TERMINATE(quoted_key);
/*
* Plug the key into the query template, which typically looks something
* like the following: [alias=%s],mail_aliases.org_dir.my.nisplus.domain.
*
* XXX The nis+ documentation defines a length limit for simple names like
* a.b.c., but defines no length limit for (the components of) indexed
* names such as [x=y],a.b.c. Our query length is limited because Postfix
* addresses (in envelopes or in headers) have a finite length.
*/
vstring_sprintf(query, dict_nisplus->template, STR(quoted_key));
reply = nis_list(STR(query), FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
/*
* When lookup succeeds, the result may be ambiguous, or the requested
* column may not exist.
*/
if (reply->status == NIS_SUCCESS) {
if ((count = NIS_RES_NUMOBJ(reply)) != 1) {
msg_warn("ambiguous match (%d results) for %s in NIS+ map %s:"
" ignoring this request",
count, key, dict_nisplus->dict.name);
nis_freeresult(reply);
return (0);
} else {
last_col = NIS_RES_OBJECT(reply)->zo_data
.objdata_u.en_data.en_cols.en_cols_len - 1;
if (dict_nisplus->column > last_col)
msg_fatal("requested column %d > max column %d in table %s",
dict_nisplus->column, last_col,
dict_nisplus->dict.name);
vstring_strcpy(retval,
NIS_RES_OBJECT(reply)->zo_data.objdata_u
.en_data.en_cols.en_cols_val[dict_nisplus->column]
.ec_value.ec_value_val);
if (msg_verbose)
msg_info("%s: %s, column %d -> %s", myname, STR(query),
dict_nisplus->column, STR(retval));
nis_freeresult(reply);
return (STR(retval));
}
}
/*
* When the NIS+ lookup fails for reasons other than "key not found",
* keep logging warnings, and hope that someone will eventually notice
* the problem and fix it.
*/
else {
if (reply->status != NIS_NOTFOUND
&& reply->status != NIS_PARTIAL) {
msg_warn("lookup %s, NIS+ map %s: %s",
key, dict_nisplus->dict.name,
nis_sperrno(reply->status));
dict->error = DICT_ERR_RETRY;
} else {
if (msg_verbose)
msg_info("%s: not found: query %s", myname, STR(query));
}
nis_freeresult(reply);
return (0);
}
}
/* dict_nisplus_close - close NISPLUS map */
static void dict_nisplus_close(DICT *dict)
{
DICT_NISPLUS *dict_nisplus = (DICT_NISPLUS *) dict;
myfree(dict_nisplus->template);
if (dict->fold_buf)
vstring_free(dict->fold_buf);
dict_free(dict);
}
/* dict_nisplus_open - open NISPLUS map */
DICT *dict_nisplus_open(const char *map, int open_flags, int dict_flags)
{
const char *myname = "dict_nisplus_open";
DICT_NISPLUS *dict_nisplus;
char *col_field;
/*
* Sanity check.
*/
if (open_flags != O_RDONLY)
return (dict_surrogate(DICT_TYPE_NISPLUS, map, open_flags, dict_flags,
"%s:%s map requires O_RDONLY access mode",
DICT_TYPE_NISPLUS, map));
/*
* Initialize. This is a read-only map with fixed strings, not with
* regular expressions.
*/
dict_nisplus = (DICT_NISPLUS *)
dict_alloc(DICT_TYPE_NISPLUS, map, sizeof(*dict_nisplus));
dict_nisplus->dict.lookup = dict_nisplus_lookup;
dict_nisplus->dict.close = dict_nisplus_close;
dict_nisplus->dict.flags = dict_flags | DICT_FLAG_FIXED;
if (dict_flags & DICT_FLAG_FOLD_FIX)
dict_nisplus->dict.fold_buf = vstring_alloc(10);
dict_nisplus->dict.owner.status = DICT_OWNER_TRUSTED;
/*
* Convert the query template into an indexed name and column number. The
* query template looks like:
*
* [attribute=%s;attribute=value...];simple.name.:column
*
* One instance of %s gets to be replaced by a version of the lookup key;
* other attributes must specify fixed values. The reason for using ';'
* is that the comma character is special in main.cf. When no column
* number is given at the end of the map name, we use a default column.
*/
dict_nisplus->template = mystrdup(map);
translit(dict_nisplus->template, ";", ",");
if ((col_field = strstr(dict_nisplus->template, ".:")) != 0) {
col_field[1] = 0;
col_field += 2;
if (!alldig(col_field) || (dict_nisplus->column = atoi(col_field)) < 1)
msg_fatal("bad column field in NIS+ map name: %s", map);
} else {
dict_nisplus->column = 1;
}
if (msg_verbose)
msg_info("%s: opened NIS+ table %s for column %d",
myname, dict_nisplus->template, dict_nisplus->column);
return (DICT_DEBUG (&dict_nisplus->dict));
}
#endif
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