------------------------------------------------------------------------
r22160 | hartmans | 2009-04-02 23:33:01 -0400 (Thu, 02 Apr 2009) | 12 lines
Changed paths:
M /trunk/doc/admin.texinfo
M /trunk/src/appl/bsd/kcmd.c
M /trunk/src/config-files/krb5.conf.M
M /trunk/src/lib/krb5/krb/init_ctx.c
M /trunk/src/lib/krb5/krb/mk_req_ext.c
ticket: 1624
Unfortunately, pre-1.7 krshd fails to support keyed checksums because
it uses the wrong API and wrong key usage. So, if the auth_context
has an explicit checksum type set, then respect that. kcmd sets such
a checksum type. Also, because other applications may have the same
problem, allow the config file variable if set to override the default
checksum.
* kcmd.c: Force use of rsa_md5
* init_ctx.c: do not default to md5
* mk_req_ext.c: allow auth_context to override
------------------------------------------------------------------------
r22159 | tlyu | 2009-04-02 19:30:28 -0400 (Thu, 02 Apr 2009) | 3 lines
Changed paths:
M /trunk/src/appl/bsd/krlogind.c
M /trunk/src/appl/bsd/krshd.c
ticket: 1624
Fix krshd and krlogind to use krb5_c_verify_checksum.
------------------------------------------------------------------------
r22154 | hartmans | 2009-04-01 14:25:02 -0400 (Wed, 01 Apr 2009) | 8 lines
Changed paths:
M /trunk/doc/admin.texinfo
M /trunk/src/config-files/krb5.conf.M
M /trunk/src/lib/krb5/krb/mk_req_ext.c
M /trunk/src/lib/krb5/krb/send_tgs.c
ticket: 1624
Target_version: 1.7
tags: pullup
Use the preferred checksum for non-DES keys in the kdc_req path and
all the time in the ap_req checksum path. This breaks code to support
DCE versions prior to 1.1 but uses the correct checksum for protocol
compatibility.
ticket: 1624
version_fixed: 1.7
git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-7@22243
dc483132-0cff-0310-8789-
dd5450dbe970
An integer which specifies the type of checksum to use. Used for
compatability with DCE security servers which do not support the
default @value{DefaultChecksumType} used by this version of Kerberos.
-The possible values and their meanings are as follows.
+The
+kdc_req_checksum_type is only used for DES keys. The ap_req_checksum_type defaults to the preferred checksum for the encryption type being used if unset. If set, then the selected checksum is used regardless of the type of key being used. The possible values and their meanings are as follows.
@comment taken from krb5/src/include/krb5.h[in]
@table @b
if (krb5_auth_con_init(bsd_context, &auth_context))
goto bad2;
+ if (krb5_auth_con_set_req_cksumtype(bsd_context, auth_context, CKSUMTYPE_RSA_MD5) !=0 )
+ goto bad2;
if (krb5_auth_con_setflags(bsd_context, auth_context,
KRB5_AUTH_CONTEXT_RET_TIME))
goto bad2;
if (authenticator->checksum) {
struct sockaddr_in adr;
socklen_t adr_length = sizeof(adr);
- char * chksumbuf = NULL;
+ krb5_data chksumbuf;
+ krb5_boolean valid = 0;
+
+ chksumbuf.data = NULL;
if (getsockname(netf, (struct sockaddr *) &adr, &adr_length) != 0)
goto error_cleanup;
- if (asprintf(&chksumbuf, "%u:%s%s", ntohs(adr.sin_port), term, lusername) < 0)
+ if (asprintf(&chksumbuf.data, "%u:%s%s", ntohs(adr.sin_port), term, lusername) < 0)
goto error_cleanup;
- status = krb5_verify_checksum(bsd_context,
- authenticator->checksum->checksum_type,
- authenticator->checksum,
- chksumbuf, strlen(chksumbuf),
- ticket->enc_part2->session->contents,
- ticket->enc_part2->session->length);
+ chksumbuf.length = strlen(chksumbuf.data);
+ status = krb5_c_verify_checksum(bsd_context,
+ ticket->enc_part2->session,
+ KRB5_KEYUSAGE_AP_REQ_AUTH_CKSUM,
+ &chksumbuf, authenticator->checksum,
+ &valid);
+ if (status == 0 && !valid) status = KRB5KRB_AP_ERR_BAD_INTEGRITY;
+
error_cleanup:
- if (chksumbuf)
- free(chksumbuf);
+ if (chksumbuf.data)
+ free(chksumbuf.data);
if (status) {
krb5_free_authenticator(bsd_context, authenticator);
return status;
struct sockaddr_storage adr;
unsigned int adr_length = sizeof(adr);
int e;
- char namebuf[32], *chksumbuf = NULL;
+ char namebuf[32];
+ krb5_boolean valid = 0;
+ krb5_data chksumbuf;
+ chksumbuf.data = NULL;
if (getsockname(netfd, (struct sockaddr *) &adr, &adr_length) != 0)
goto error_cleanup;
namebuf, sizeof(namebuf), NI_NUMERICSERV);
if (e)
fatal(netfd, "local error: can't examine port number");
- if (asprintf(&chksumbuf, "%s:%s%s", namebuf, cmdbuf, locuser) < 0)
+ if (asprintf(&chksumbuf.data, "%s:%s%s", namebuf, cmdbuf, locuser) < 0)
goto error_cleanup;
- status = krb5_verify_checksum(bsd_context,
- authenticator->checksum->checksum_type,
- authenticator->checksum,
- chksumbuf, strlen(chksumbuf),
- ticket->enc_part2->session->contents,
- ticket->enc_part2->session->length);
+ chksumbuf.length = strlen(chksumbuf.data);
+ status = krb5_c_verify_checksum(bsd_context,
+ ticket->enc_part2->session,
+ KRB5_KEYUSAGE_AP_REQ_AUTH_CKSUM,
+ &chksumbuf, authenticator->checksum,
+ &valid);
+ if (status == 0 && !valid) status = KRB5KRB_AP_ERR_BAD_INTEGRITY;
error_cleanup:
- if (chksumbuf)
- free(chksumbuf);
+ if (chksumbuf.data)
+ free(chksumbuf.data);
if (status) {
krb5_free_authenticator(bsd_context, authenticator);
return status;
For compatability with DCE security servers which do not support the
default CKSUMTYPE_RSA_MD5 used by this version of Kerberos. Use a value
of 2 to use the CKSUMTYPE_RSA_MD4 instead. This applies to DCE 1.1 and
-earlier.
+earlier. This value is only used for DES keys; other keys use the
+preferred checksum type for those keys.
.IP ap_req_checksum_type
-This allows you to set the checksum type used in the authenticator of
-KRB_AP_REQ messages. The default value for this type is
-CKSUMTYPE_RSA_MD5. For compatibility with applications linked against
-DCE version 1.1 or earlier Kerberos libraries, use a value of 2 to use
-the CKSUMTYPE_RSA_MD4
-instead.
+If set this variable controls what ap-req checksum will be used in authenticators. This variable should be unset so the appropriate checksum for the encryption key in use will be used. This can be set if backward compatibility requires a specific checksum type.
.IP safe_checksum_type
This allows you to set the preferred keyed-checksum type for use in KRB_SAFE
ctx->kdc_req_sumtype = tmp;
profile_get_integer(ctx->profile, KRB5_CONF_LIBDEFAULTS,
- KRB5_CONF_AP_REQ_CHECKSUM_TYPE, 0, CKSUMTYPE_RSA_MD5,
+ KRB5_CONF_AP_REQ_CHECKSUM_TYPE, 0, 0,
&tmp);
ctx->default_ap_req_sumtype = tmp;
checksum.length = in_data->length;
checksum.contents = (krb5_octet *) in_data->data;
} else {
+ krb5_cksumtype cksumtype;
+ retval = krb5int_c_mandatory_cksumtype(context, (*auth_context)->keyblock->enctype,
+ &cksumtype);
+ if (retval)
+ goto cleanup_cksum;
+ if ((*auth_context)->req_cksumtype)
+ cksumtype = (*auth_context)->req_cksumtype;
if ((retval = krb5_c_make_checksum(context,
- (*auth_context)->req_cksumtype,
+ cksumtype,
(*auth_context)->keyblock,
KRB5_KEYUSAGE_AP_REQ_AUTH_CKSUM,
in_data, &checksum)))
tgs_construct_tgsreq(krb5_context context, krb5_data *in_data,
krb5_creds *in_cred, krb5_data *outbuf, krb5_keyblock *subkey)
{
+ krb5_cksumtype cksumtype;
krb5_error_code retval;
krb5_checksum checksum;
krb5_authenticator authent;
request.authenticator.kvno = 0;
request.ap_options = 0;
request.ticket = 0;
-
+ switch (in_cred->keyblock.enctype) {
+ case ENCTYPE_DES_CBC_CRC:
+ case ENCTYPE_DES_CBC_MD4:
+ case ENCTYPE_DES_CBC_MD5:
+ cksumtype = context->kdc_req_sumtype;
+ break;
+ default:
+ retval = krb5int_c_mandatory_cksumtype(context, in_cred->keyblock.enctype, &cksumtype);
+ if (retval)
+ goto cleanup;
+ }
+
/* Generate checksum */
- if ((retval = krb5_c_make_checksum(context, context->kdc_req_sumtype,
+ if ((retval = krb5_c_make_checksum(context, cksumtype,
&in_cred->keyblock,
KRB5_KEYUSAGE_TGS_REQ_AUTH_CKSUM,
in_data, &checksum))) {
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