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/*
* lib/krb5/krb/conv_princ.c
*
* Copyright 1992 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.
*
* Build a principal from a V4 specification, or separate a V5
* principal into name, instance, and realm.
*
* NOTE: This is highly site specific, and is only really necessary
* for sites who need to convert from V4 to V5. It is used by both
* the KDC and the kdb5_convert program. Since its use is highly
* specialized, the necesary information is just going to be
* hard-coded in this file.
*/
#include "k5-int.h"
#include <string.h>
#include <ctype.h>
/* The maximum sizes for V4 aname, realm, sname, and instance +1 */
/* Taken from krb.h */
#define ANAME_SZ 40
#define REALM_SZ 40
#define SNAME_SZ 40
#define INST_SZ 40
struct krb_convert {
char *v4_str;
char *v5_str;
unsigned int flags : 8;
unsigned int len : 8;
};
#define DO_REALM_CONVERSION 0x00000001
/*
* Kadmin doesn't do realm conversion because it's currently
* kadmin/REALM.NAME. Zephyr doesn't because it's just zephyr/zephyr.
*
* "Realm conversion" is a bit of a misnomer; really, the v5 name is
* using a FQDN or something that looks like it, where the v4 name is
* just using the first label. Sometimes that second principal name
* component is a hostname, sometimes the realm name, sometimes it's
* neither.
*
* This list should probably be more configurable, and more than
* likely on a per-realm basis, so locally-defined services can be
* added, or not.
*/
static const struct krb_convert sconv_list[] = {
/* Realm conversion, Change service name */
#define RC(V5NAME,V4NAME) { V5NAME, V4NAME, DO_REALM_CONVERSION, sizeof(V5NAME)-1 }
/* Realm conversion */
#define R(NAME) { NAME, NAME, DO_REALM_CONVERSION, sizeof(NAME)-1 }
/* No Realm conversion */
#define NR(NAME) { NAME, NAME, 0, sizeof(NAME)-1 }
NR("kadmin"),
RC("rcmd", "host"),
R("discuss"),
R("rvdsrv"),
R("sample"),
R("olc"),
R("pop"),
R("sis"),
R("rfs"),
R("imap"),
R("ftp"),
R("ecat"),
R("daemon"),
R("gnats"),
R("moira"),
R("prms"),
R("mandarin"),
R("register"),
R("changepw"),
R("sms"),
R("afpserver"),
R("gdss"),
R("news"),
R("abs"),
R("nfs"),
R("tftp"),
NR("zephyr"),
R("http"),
R("khttp"),
R("pgpsigner"),
R("irc"),
R("mandarin-agent"),
R("write"),
R("palladium"),
{0, 0, 0, 0},
#undef R
#undef RC
#undef NR
};
/*
* char *strnchr(s, c, n)
* char *s;
* char c;
* unsigned int n;
*
* returns a pointer to the first occurrence of character c in the
* string s, or a NULL pointer if c does not occur in in the string;
* however, at most the first n characters will be considered.
*
* This falls in the "should have been in the ANSI C library"
* category. :-)
*/
static char *strnchr(register char *s, register int c,
register unsigned int n)
{
if (n < 1)
return 0;
while (n-- && *s) {
if (*s == c)
return s;
s++;
}
return 0;
}
/* XXX This calls for a new error code */
#define KRB5_INVALID_PRINCIPAL KRB5_LNAME_BADFORMAT
krb5_error_code KRB5_CALLCONV
krb5_524_conv_principal(krb5_context context, krb5_const_principal princ,
char *name, char *inst, char *realm)
{
const struct krb_convert *p;
const krb5_data *compo;
char *c, *tmp_realm, *tmp_prealm;
unsigned int tmp_realm_len;
int retval;
*name = *inst = '\0';
switch (krb5_princ_size(context, princ)) {
case 2:
/* Check if this principal is listed in the table */
compo = krb5_princ_component(context, princ, 0);
p = sconv_list;
while (p->v4_str) {
if (p->len == compo->length
&& memcmp(p->v5_str, compo->data, compo->length) == 0) {
/*
* It is, so set the new name now, and chop off
* instance's domain name if requested.
*/
if (strlen (p->v4_str) > ANAME_SZ - 1)
return KRB5_INVALID_PRINCIPAL;
strcpy(name, p->v4_str);
if (p->flags & DO_REALM_CONVERSION) {
compo = krb5_princ_component(context, princ, 1);
c = strnchr(compo->data, '.', compo->length);
if (!c || (c - compo->data) >= INST_SZ - 1)
return KRB5_INVALID_PRINCIPAL;
memcpy(inst, compo->data, (size_t) (c - compo->data));
inst[c - compo->data] = '\0';
}
break;
}
p++;
}
/* If inst isn't set, the service isn't listed in the table, */
/* so just copy it. */
if (*inst == '\0') {
compo = krb5_princ_component(context, princ, 1);
if (compo->length >= INST_SZ - 1)
return KRB5_INVALID_PRINCIPAL;
memcpy(inst, compo->data, compo->length);
inst[compo->length] = '\0';
}
/* fall through */
case 1:
/* name may have been set above; otherwise, just copy it */
if (*name == '\0') {
compo = krb5_princ_component(context, princ, 0);
if (compo->length >= ANAME_SZ)
return KRB5_INVALID_PRINCIPAL;
memcpy(name, compo->data, compo->length);
name[compo->length] = '\0';
}
break;
default:
return KRB5_INVALID_PRINCIPAL;
}
compo = krb5_princ_realm(context, princ);
tmp_prealm = malloc(compo->length + 1);
if (tmp_prealm == NULL)
return ENOMEM;
strncpy(tmp_prealm, compo->data, compo->length);
tmp_prealm[compo->length] = '\0';
/* Ask for v4_realm corresponding to
krb5 principal realm from krb5.conf realms stanza */
if (context->profile == 0)
return KRB5_CONFIG_CANTOPEN;
retval = profile_get_string(context->profile, "realms",
tmp_prealm, "v4_realm", 0,
&tmp_realm);
free(tmp_prealm);
if (retval) {
return retval;
} else {
if (tmp_realm == 0) {
if (compo->length > REALM_SZ - 1)
return KRB5_INVALID_PRINCIPAL;
strncpy(realm, compo->data, compo->length);
realm[compo->length] = '\0';
} else {
tmp_realm_len = strlen(tmp_realm);
if (tmp_realm_len > REALM_SZ - 1)
return KRB5_INVALID_PRINCIPAL;
strncpy(realm, tmp_realm, tmp_realm_len);
realm[tmp_realm_len] = '\0';
profile_release_string(tmp_realm);
}
}
return 0;
}
krb5_error_code KRB5_CALLCONV
krb5_425_conv_principal(krb5_context context, const char *name,
const char *instance, const char *realm,
krb5_principal *princ)
{
const struct krb_convert *p;
char buf[256]; /* V4 instances are limited to 40 characters */
krb5_error_code retval;
char *domain, *cp;
char **full_name = 0;
const char *names[5], *names2[2];
void* iterator = NULL;
char** v4realms = NULL;
char* realm_name = NULL;
char* dummy_value = NULL;
/* First, convert the realm, since the v4 realm is not necessarily the same as the v5 realm
To do that, iterate over all the realms in the config file, looking for a matching
v4_realm line */
names2 [0] = "realms";
names2 [1] = NULL;
retval = profile_iterator_create (context -> profile, names2, PROFILE_ITER_LIST_SECTION | PROFILE_ITER_SECTIONS_ONLY, &iterator);
while (retval == 0) {
retval = profile_iterator (&iterator, &realm_name, &dummy_value);
if ((retval == 0) && (realm_name != NULL)) {
names [0] = "realms";
names [1] = realm_name;
names [2] = "v4_realm";
names [3] = NULL;
retval = profile_get_values (context -> profile, names, &v4realms);
if ((retval == 0) && (v4realms != NULL) && (v4realms [0] != NULL) && (strcmp (v4realms [0], realm) == 0)) {
realm = realm_name;
break;
} else if (retval == PROF_NO_RELATION) {
/* If it's not found, just keep going */
retval = 0;
}
} else if ((retval == 0) && (realm_name == NULL)) {
break;
}
if (v4realms != NULL) {
profile_free_list(v4realms);
v4realms = NULL;
}
if (realm_name != NULL) {
profile_release_string (realm_name);
realm_name = NULL;
}
if (dummy_value != NULL) {
profile_release_string (dummy_value);
dummy_value = NULL;
}
}
if (instance) {
if (instance[0] == '\0') {
instance = 0;
goto not_service;
}
p = sconv_list;
while (1) {
if (!p->v4_str)
goto not_service;
if (!strcmp(p->v4_str, name))
break;
p++;
}
name = p->v5_str;
if ((p->flags & DO_REALM_CONVERSION) && !strchr(instance, '.')) {
names[0] = "realms";
names[1] = realm;
names[2] = "v4_instance_convert";
names[3] = instance;
names[4] = 0;
retval = profile_get_values(context->profile, names, &full_name);
if (retval == 0 && full_name && full_name[0]) {
instance = full_name[0];
} else {
strncpy(buf, instance, sizeof(buf));
buf[sizeof(buf) - 1] = '\0';
retval = krb5_get_realm_domain(context, realm, &domain);
if (retval)
return retval;
if (domain) {
for (cp = domain; *cp; cp++)
if (isupper((unsigned char) (*cp)))
*cp = tolower((unsigned char) *cp);
strncat(buf, ".", sizeof(buf) - 1 - strlen(buf));
strncat(buf, domain, sizeof(buf) - 1 - strlen(buf));
krb5_xfree(domain);
}
instance = buf;
}
}
}
not_service:
retval = krb5_build_principal(context, princ, strlen(realm), realm, name,
instance, NULL);
if (iterator) profile_iterator_free (&iterator);
if (full_name) profile_free_list(full_name);
if (v4realms) profile_free_list(v4realms);
if (realm_name) profile_release_string (realm_name);
if (dummy_value) profile_release_string (dummy_value);
return retval;
}
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