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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/krb/parse.c - Parse strings into krb5_principals */
/*
* Copyright 1990,1991,2008,2012 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
#include "k5-int.h"
/*
* Scan name and allocate a shell principal with enough space in each field.
* If enterprise is true, use enterprise principal parsing rules. Return
* KRB5_PARSE_MALFORMED if name is malformed. Set *has_realm_out according to
* whether name contains a realm separator.
*/
static krb5_error_code
allocate_princ(krb5_context context, const char *name, krb5_boolean enterprise,
krb5_principal *princ_out, krb5_boolean *has_realm_out)
{
krb5_error_code ret;
const char *p;
krb5_boolean first_at = TRUE;
krb5_principal princ = NULL;
krb5_data *cur_data, *new_comps;
krb5_int32 i;
*princ_out = NULL;
*has_realm_out = FALSE;
/* Allocate a starting principal with one component. */
princ = k5alloc(sizeof(*princ), &ret);
if (princ == NULL)
goto cleanup;
princ->data = k5alloc(sizeof(*princ->data), &ret);
if (princ->data == NULL)
goto cleanup;
princ->realm = empty_data();
princ->data[0] = empty_data();
princ->length = 1;
cur_data = &princ->data[0];
for (p = name; *p != '\0'; p++) {
if (*p == '/' && !enterprise) {
/* Component separator (for non-enterprise principals). We
* shouldn't see this in the realm name. */
if (cur_data == &princ->realm) {
ret = KRB5_PARSE_MALFORMED;
goto cleanup;
}
new_comps = realloc(princ->data,
(princ->length + 1) * sizeof(*princ->data));
if (new_comps == NULL) {
ret = ENOMEM;
goto cleanup;
}
princ->data = new_comps;
princ->length++;
cur_data = &princ->data[princ->length - 1];
*cur_data = empty_data();
} else if (*p == '@' && (!enterprise || !first_at)) {
/* Realm separator. In enterprise principals, the first one of
* these we see is part of the component. */
if (cur_data == &princ->realm) {
ret = KRB5_PARSE_MALFORMED;
goto cleanup;
}
cur_data = &princ->realm;
} else {
/* Component or realm character, possibly quoted. Make note if
* we're seeing the first '@' in an enterprise principal. */
cur_data->length++;
if (*p == '@' && enterprise)
first_at = FALSE;
if (*p == '\\') {
/* Quote character can't be the last character of the name. */
if (*++p == '\0') {
ret = KRB5_PARSE_MALFORMED;
goto cleanup;
}
}
}
}
/* Allocate space for each component and the realm, with space for null
* terminators on each field. */
for (i = 0; i < princ->length; i++) {
princ->data[i].data = k5alloc(princ->data[i].length + 1, &ret);
if (princ->data[i].data == NULL)
goto cleanup;
}
princ->realm.data = k5alloc(princ->realm.length + 1, &ret);
if (princ->realm.data == NULL)
goto cleanup;
*princ_out = princ;
*has_realm_out = (cur_data == &princ->realm);
princ = NULL;
cleanup:
krb5_free_principal(context, princ);
return ret;
}
/*
* Parse name into princ, assuming that name is correctly formed and that all
* principal fields are allocated to the correct length with zero-filled memory
* (so we get null-terminated fields without any extra work). If enterprise is
* true, use enterprise principal parsing rules.
*/
static void
parse_name_into_princ(const char *name, krb5_boolean enterprise,
krb5_principal princ)
{
const char *p;
char c;
krb5_boolean first_at = TRUE;
krb5_data *cur_data = princ->data;
unsigned int pos = 0;
for (p = name; *p != '\0'; p++) {
if (*p == '/' && !enterprise) {
/* Advance to the next component. */
assert(pos == cur_data->length);
assert(cur_data != &princ->realm);
assert(cur_data - princ->data + 1 < princ->length);
cur_data++;
pos = 0;
} else if (*p == '@' && (!enterprise || !first_at)) {
/* Advance to the realm. */
assert(pos == cur_data->length);
cur_data = &princ->realm;
pos = 0;
} else {
/* Add to the current component or to the realm. */
if (*p == '@' && enterprise)
first_at = FALSE;
c = *p;
if (c == '\\') {
c = *++p;
if (c == 'n')
c = '\n';
else if (c == 't')
c = '\t';
else if (c == 'b')
c = '\b';
else if (c == '0')
c = '\0';
}
assert(pos < cur_data->length);
cur_data->data[pos++] = c;
}
}
assert(pos == cur_data->length);
}
krb5_error_code KRB5_CALLCONV
krb5_parse_name_flags(krb5_context context, const char *name,
int flags, krb5_principal *principal_out)
{
krb5_error_code ret;
krb5_principal princ = NULL;
char *default_realm;
krb5_boolean has_realm;
krb5_boolean enterprise = (flags & KRB5_PRINCIPAL_PARSE_ENTERPRISE);
krb5_boolean require_realm = (flags & KRB5_PRINCIPAL_PARSE_REQUIRE_REALM);
krb5_boolean no_realm = (flags & KRB5_PRINCIPAL_PARSE_NO_REALM);
krb5_boolean ignore_realm = (flags & KRB5_PRINCIPAL_PARSE_IGNORE_REALM);
*principal_out = NULL;
ret = allocate_princ(context, name, enterprise, &princ, &has_realm);
if (ret)
goto cleanup;
parse_name_into_princ(name, enterprise, princ);
/*
* If a realm was not found, then use the default realm, unless
* KRB5_PRINCIPAL_PARSE_NO_REALM was specified in which case the
* realm will be empty.
*/
if (!has_realm) {
if (require_realm) {
ret = KRB5_PARSE_MALFORMED;
k5_setmsg(context, ret,
_("Principal %s is missing required realm"), name);
goto cleanup;
}
if (!no_realm && !ignore_realm) {
ret = krb5_get_default_realm(context, &default_realm);
if (ret)
goto cleanup;
krb5_free_data_contents(context, &princ->realm);
princ->realm = string2data(default_realm);
}
} else if (no_realm) {
ret = KRB5_PARSE_MALFORMED;
k5_setmsg(context, ret, _("Principal %s has realm present"), name);
goto cleanup;
} else if (ignore_realm) {
krb5_free_data_contents(context, &princ->realm);
princ->realm = empty_data();
}
princ->type = (enterprise) ? KRB5_NT_ENTERPRISE_PRINCIPAL :
KRB5_NT_PRINCIPAL;
princ->magic = KV5M_PRINCIPAL;
*principal_out = princ;
princ = NULL;
cleanup:
krb5_free_principal(context, princ);
return ret;
}
krb5_error_code KRB5_CALLCONV
krb5_parse_name(krb5_context context, const char *name,
krb5_principal *principal_out)
{
return krb5_parse_name_flags(context, name, 0, principal_out);
}
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