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heimdal:lib/krb5: verify_logonname() to handle multi component principal

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FreeIPA can generate tickets with a client principal of
'host/hostname.example.com'.

verify_logonname() should just verify the principal name
in the PAC_LOGON_NAME is the same as the principal of
the client principal (without realm) of the ticket.

Samba commit b7cc8c1187
break this. We try to compare ['host']['hostname.example.com']
with ['host/hostname.example.com]' (as we interpret it as enterprise principal)
this fail if we don't compare them as strings.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11142

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This commit is contained in:
Stefan Metzmacher 2015-05-20 13:40:58 +00:00
parent 88d1b44d15
commit 47a3f9cc5a
1 changed files with 22 additions and 16 deletions
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38
source4/heimdal/lib/krb5/pac.c
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@ -595,11 +595,12 @@ verify_logonname(krb5_context context,
krb5_const_principal principal)
{
krb5_error_code ret;
krb5_principal p2;
uint32_t time1, time2;
krb5_storage *sp;
uint16_t len;
char *s;
char *s = NULL;
char *principal_string = NULL;
char *logon_string = NULL;
sp = krb5_storage_from_readonly_mem((const char *)data->data + logon_name->offset_lo,
logon_name->buffersize);
@ -664,31 +665,36 @@ verify_logonname(krb5_context context,
return ret;
}
u8len += 1; /* Add space for NUL */
s = malloc(u8len);
if (s == NULL) {
logon_string = malloc(u8len);
if (logon_string == NULL) {
free(ucs2);
return krb5_enomem(context);
}
ret = wind_ucs2utf8(ucs2, ucs2len, s, &u8len);
ret = wind_ucs2utf8(ucs2, ucs2len, logon_string, &u8len);
free(ucs2);
if (ret) {
free(s);
free(logon_string);
krb5_set_error_message(context, ret, "Failed to convert to UTF-8");
return ret;
}
}
ret = krb5_parse_name_flags(context, s,
KRB5_PRINCIPAL_PARSE_NO_REALM |
KRB5_PRINCIPAL_PARSE_ENTERPRISE, &p2);
free(s);
if (ret)
ret = krb5_unparse_name_flags(context, principal,
KRB5_PRINCIPAL_UNPARSE_NO_REALM |
KRB5_PRINCIPAL_UNPARSE_DISPLAY,
&principal_string);
if (ret) {
free(logon_string);
return ret;
if (krb5_principal_compare_any_realm(context, principal, p2) != TRUE) {
ret = EINVAL;
krb5_set_error_message(context, ret, "PAC logon name mismatch");
}
krb5_free_principal(context, p2);
ret = strcmp(logon_string, principal_string);
if (ret != 0) {
ret = EINVAL;
krb5_set_error_message(context, ret, "PAC logon name [%s] mismatch principal name [%s]",
logon_string, principal_string);
}
free(logon_string);
free(principal_string);
return ret;
out:
return ret;