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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. 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;
int flags;
};
#define DO_REALM_CONVERSION 0x00000001
/*
* Kadmin doesn't do realm conversion because it's currently
* kadmin/REALM.NAME. It should be kadmin/kerberos.master.host, but
* we'll fix that in the next release.
*/
static const struct krb_convert sconv_list[] = {
{"kadmin", "kadmin", 0},
{"rcmd", "host", DO_REALM_CONVERSION},
{"discuss", "discuss", DO_REALM_CONVERSION},
{"rvdsrv", "rvdsrv", DO_REALM_CONVERSION},
{"sample", "sample", DO_REALM_CONVERSION},
{"olc", "olc", DO_REALM_CONVERSION},
{"pop", "pop", DO_REALM_CONVERSION},
{"sis", "sis", DO_REALM_CONVERSION},
{"rfs", "rfs", DO_REALM_CONVERSION},
{"imap", "imap", DO_REALM_CONVERSION},
{"ftp", "ftp", DO_REALM_CONVERSION},
{"ecat", "ecat", DO_REALM_CONVERSION},
{0, 0, 0},
};
/*
* char *strnchr(s, c, n)
* char *s;
* char c;
* 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(s, c, n)
register char *s, c;
register 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_DLLIMP krb5_error_code KRB5_CALLCONV
krb5_524_conv_principal(context, princ, name, inst, realm)
krb5_context context;
const krb5_principal princ;
char FAR *name;
char FAR *inst;
char FAR *realm;
{
const struct krb_convert *p;
krb5_data *compo;
char *c;
*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 (strncmp(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 */
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;
strncpy(inst, compo->data, 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;
strncpy(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;
strncpy(name, compo->data, compo->length);
name[compo->length] = '\0';
}
break;
default:
return KRB5_INVALID_PRINCIPAL;
}
compo = krb5_princ_realm(context, princ);
if (compo->length > REALM_SZ - 1)
return KRB5_INVALID_PRINCIPAL;
strncpy(realm, compo->data, compo->length);
realm[compo->length] = '\0';
return 0;
}
KRB5_DLLIMP krb5_error_code KRB5_CALLCONV
krb5_425_conv_principal(context, name, instance, realm, princ)
krb5_context context;
const char FAR *name;
const char FAR *instance;
const char FAR *realm;
krb5_principal FAR *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, **cpp;
const char *names[5];
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 {
strcpy(buf, instance);
retval = krb5_get_realm_domain(context, realm, &domain);
if (retval)
return retval;
if (domain) {
for (cp = domain; *cp; cp++)
if (isupper(*cp))
*cp = tolower(*cp);
strcat(buf, ".");
strcat(buf, domain);
krb5_xfree(domain);
}
instance = buf;
}
}
}
not_service:
retval = krb5_build_principal(context, princ, strlen(realm), realm, name,
instance, 0);
if (full_name) {
for (cpp = full_name; *cpp; cpp++)
krb5_xfree(*cpp);
krb5_xfree(full_name);
}
return retval;
}
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