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-rw-r--r--source4/auth/gensec/gensec_gssapi.c14
-rw-r--r--source4/auth/gensec/gensec_krb5.c10
-rw-r--r--source4/auth/kerberos/kerberos.h3
-rw-r--r--source4/auth/kerberos/kerberos_pac.c53
-rw-r--r--source4/librpc/idl/krb5pac.idl2
-rw-r--r--source4/torture/auth/pac.c39
6 files changed, 90 insertions, 31 deletions
diff --git a/source4/auth/gensec/gensec_gssapi.c b/source4/auth/gensec/gensec_gssapi.c
index 2b7c4ca2cc..e6049edc58 100644
--- a/source4/auth/gensec/gensec_gssapi.c
+++ b/source4/auth/gensec/gensec_gssapi.c
@@ -228,6 +228,16 @@ static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_securi
NTSTATUS nt_status;
gss_buffer_desc name_token;
OM_uint32 maj_stat, min_stat;
+ const char *hostname = gensec_get_target_hostname(gensec_security);
+
+ if (!hostname) {
+ DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+ if (is_ipaddress(hostname)) {
+ DEBUG(2, ("Cannot do GSSAPI to a IP address"));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
nt_status = gensec_gssapi_start(gensec_security);
if (!NT_STATUS_IS_OK(nt_status)) {
@@ -238,7 +248,7 @@ static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_securi
name_token.value = talloc_asprintf(gensec_gssapi_state, "%s@%s",
gensec_get_target_service(gensec_security),
- gensec_get_target_hostname(gensec_security));
+ hostname);
name_token.length = strlen(name_token.value);
maj_stat = gss_import_name (&min_stat,
@@ -786,7 +796,7 @@ static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_securi
/* decode and verify the pac */
nt_status = kerberos_decode_pac(mem_ctx, &logon_info, pac_blob,
gensec_gssapi_state->smb_krb5_context,
- keyblock);
+ NULL, keyblock);
if (NT_STATUS_IS_OK(nt_status)) {
union netr_Validation validation;
diff --git a/source4/auth/gensec/gensec_krb5.c b/source4/auth/gensec/gensec_krb5.c
index 69dae1c8d9..168b6df364 100644
--- a/source4/auth/gensec/gensec_krb5.c
+++ b/source4/auth/gensec/gensec_krb5.c
@@ -138,8 +138,13 @@ static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security
const char *hostname = gensec_get_target_hostname(gensec_security);
if (!hostname) {
DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
- return NT_STATUS_ACCESS_DENIED;
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+ if (is_ipaddress(hostname)) {
+ DEBUG(2, ("Cannot do GSSAPI to a IP address"));
+ return NT_STATUS_INVALID_PARAMETER;
}
+
nt_status = gensec_krb5_start(gensec_security);
if (!NT_STATUS_IS_OK(nt_status)) {
@@ -444,7 +449,8 @@ static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security
/* decode and verify the pac */
nt_status = kerberos_decode_pac(gensec_krb5_state, &logon_info, gensec_krb5_state->pac,
- gensec_krb5_state->smb_krb5_context, (gensec_krb5_state->keyblock));
+ gensec_krb5_state->smb_krb5_context,
+ NULL, gensec_krb5_state->keyblock);
/* IF we have the PAC - otherwise we need to get this
* data from elsewere - local ldb, or (TODO) lookup of some
diff --git a/source4/auth/kerberos/kerberos.h b/source4/auth/kerberos/kerberos.h
index a7c370a1e5..c5b361df5e 100644
--- a/source4/auth/kerberos/kerberos.h
+++ b/source4/auth/kerberos/kerberos.h
@@ -131,7 +131,8 @@ NTSTATUS kerberos_decode_pac(TALLOC_CTX *mem_ctx,
struct PAC_LOGON_INFO **logon_info_out,
DATA_BLOB blob,
struct smb_krb5_context *smb_krb5_context,
- krb5_keyblock *keyblock);
+ krb5_keyblock *service_keyblock,
+ krb5_keyblock *krbtgt_keyblock);
krb5_error_code kerberos_encode_pac(TALLOC_CTX *mem_ctx,
struct auth_serversupplied_info *server_info,
diff --git a/source4/auth/kerberos/kerberos_pac.c b/source4/auth/kerberos/kerberos_pac.c
index b0844187e5..858f91045c 100644
--- a/source4/auth/kerberos/kerberos_pac.c
+++ b/source4/auth/kerberos/kerberos_pac.c
@@ -53,7 +53,8 @@ static NTSTATUS check_pac_checksum(TALLOC_CTX *mem_ctx,
0,
&crypto);
if (ret) {
- DEBUG(0,("krb5_crypto_init() failed\n"));
+ DEBUG(0,("krb5_crypto_init() failed: %s\n",
+ smb_get_krb5_error_message(context, ret, mem_ctx)));
return NT_STATUS_FOOBAR;
}
ret = krb5_verify_checksum(context,
@@ -77,10 +78,11 @@ static NTSTATUS check_pac_checksum(TALLOC_CTX *mem_ctx,
}
NTSTATUS kerberos_decode_pac(TALLOC_CTX *mem_ctx,
- struct PAC_LOGON_INFO **logon_info_out,
- DATA_BLOB blob,
- struct smb_krb5_context *smb_krb5_context,
- krb5_keyblock *keyblock)
+ struct PAC_LOGON_INFO **logon_info_out,
+ DATA_BLOB blob,
+ struct smb_krb5_context *smb_krb5_context,
+ krb5_keyblock *krbtgt_keyblock,
+ krb5_keyblock *service_keyblock)
{
NTSTATUS status;
struct PAC_SIGNATURE_DATA srv_sig;
@@ -159,11 +161,26 @@ static NTSTATUS check_pac_checksum(TALLOC_CTX *mem_ctx,
/* verify by service_key */
status = check_pac_checksum(mem_ctx,
modified_pac_blob, &srv_sig,
- smb_krb5_context->krb5_context, keyblock);
-
+ smb_krb5_context->krb5_context,
+ service_keyblock);
if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1, ("PAC Decode: Failed to verify the service signature\n"));
return status;
}
+
+ if (krbtgt_keyblock) {
+ DATA_BLOB service_checksum_blob
+ = data_blob(srv_sig_ptr->signature, sizeof(srv_sig_ptr->signature));
+
+ status = check_pac_checksum(mem_ctx,
+ service_checksum_blob, &kdc_sig,
+ smb_krb5_context->krb5_context, krbtgt_keyblock);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1, ("PAC Decode: Failed to verify the krbtgt signature\n"));
+ return status;
+ }
+ }
+
DEBUG(0,("account_name: %s [%s]\n",
logon_info->info3.base.account_name.string,
logon_info->info3.base.full_name.string));
@@ -221,13 +238,13 @@ static krb5_error_code make_pac_checksum(TALLOC_CTX *mem_ctx,
struct auth_serversupplied_info *server_info,
krb5_context context,
krb5_keyblock *krbtgt_keyblock,
- krb5_keyblock *server_keyblock,
+ krb5_keyblock *service_keyblock,
DATA_BLOB *pac)
{
NTSTATUS nt_status;
DATA_BLOB zero_blob = data_blob(NULL, 0);
DATA_BLOB tmp_blob = data_blob(NULL, 0);
- DATA_BLOB server_checksum_blob;
+ DATA_BLOB service_checksum_blob;
krb5_error_code ret;
struct PAC_DATA *pac_data = talloc(mem_ctx, struct PAC_DATA);
struct netr_SamInfo3 *sam3;
@@ -335,9 +352,9 @@ static krb5_error_code make_pac_checksum(TALLOC_CTX *mem_ctx,
return ret;
}
- ret = make_pac_checksum(mem_ctx, zero_blob, SRV_CHECKSUM, context, server_keyblock);
+ ret = make_pac_checksum(mem_ctx, zero_blob, SRV_CHECKSUM, context, service_keyblock);
if (ret) {
- DEBUG(2, ("making server PAC checksum failed: %s\n",
+ DEBUG(2, ("making service PAC checksum failed: %s\n",
smb_get_krb5_error_message(context, ret, mem_ctx)));
talloc_free(pac_data);
return ret;
@@ -357,19 +374,13 @@ static krb5_error_code make_pac_checksum(TALLOC_CTX *mem_ctx,
/* Then sign the result of the previous push, where the sig was zero'ed out */
ret = make_pac_checksum(mem_ctx, tmp_blob, SRV_CHECKSUM,
- context, server_keyblock);
+ context, service_keyblock);
- /* Push the Server checksum out */
- nt_status = ndr_push_struct_blob(&server_checksum_blob, mem_ctx, SRV_CHECKSUM,
- (ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
- if (!NT_STATUS_IS_OK(nt_status)) {
- DEBUG(1, ("PAC_SIGNATURE push failed: %s\n", nt_errstr(nt_status)));
- talloc_free(pac_data);
- return EINVAL;
- }
+ service_checksum_blob
+ = data_blob(SRV_CHECKSUM->signature, sizeof(SRV_CHECKSUM->signature));
/* Then sign Server checksum */
- ret = make_pac_checksum(mem_ctx, server_checksum_blob, KDC_CHECKSUM, context, krbtgt_keyblock);
+ ret = make_pac_checksum(mem_ctx, service_checksum_blob, KDC_CHECKSUM, context, krbtgt_keyblock);
if (ret) {
DEBUG(2, ("making krbtgt PAC checksum failed: %s\n",
smb_get_krb5_error_message(context, ret, mem_ctx)));
diff --git a/source4/librpc/idl/krb5pac.idl b/source4/librpc/idl/krb5pac.idl
index 13a562a8f8..7a975946d7 100644
--- a/source4/librpc/idl/krb5pac.idl
+++ b/source4/librpc/idl/krb5pac.idl
@@ -18,7 +18,7 @@ interface krb5pac
[flag(STR_SIZE2|STR_NOTERM|STR_BYTESIZE)] string account_name;
} PAC_LOGON_NAME;
- typedef [public,flag(NDR_PAHEX)] struct {
+ typedef [flag(NDR_PAHEX)] struct {
uint32 type;
uint8 signature[16];
} PAC_SIGNATURE_DATA;
diff --git a/source4/torture/auth/pac.c b/source4/torture/auth/pac.c
index ecf67a9014..ade68fcd77 100644
--- a/source4/torture/auth/pac.c
+++ b/source4/torture/auth/pac.c
@@ -26,6 +26,7 @@
#include "auth/auth.h"
#include "auth/kerberos/kerberos.h"
#include "librpc/gen_ndr/ndr_krb5pac.h"
+#include "librpc/gen_ndr/ndr_samr.h"
#ifdef HAVE_KRB5
@@ -105,15 +106,14 @@ static BOOL torture_pac_self_check(void)
&server_keyblock,
&tmp_blob);
- krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
- &krbtgt_keyblock);
-
if (ret) {
DEBUG(1, ("PAC encoding failed: %s\n",
smb_get_krb5_error_message(smb_krb5_context->krb5_context,
ret, mem_ctx)));
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
+ &krbtgt_keyblock);
+ krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
talloc_free(mem_ctx);
return False;
@@ -125,7 +125,11 @@ static BOOL torture_pac_self_check(void)
nt_status = kerberos_decode_pac(mem_ctx, &pac_info,
tmp_blob,
smb_krb5_context,
+ &krbtgt_keyblock,
&server_keyblock);
+
+ krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
+ &krbtgt_keyblock);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
if (ret) {
@@ -196,7 +200,9 @@ static BOOL torture_pac_saved_check(void)
struct PAC_LOGON_INFO *pac_info;
struct PAC_DATA pac_data;
krb5_keyblock server_keyblock;
+ krb5_keyblock krbtgt_keyblock;
uint8_t server_bytes[16];
+ struct samr_Password *krbtgt_bytes;
krb5_error_code ret;
@@ -209,6 +215,13 @@ static BOOL torture_pac_saved_check(void)
return False;
}
+ krbtgt_bytes = smbpasswd_gethexpwd(mem_ctx, "B286757148AF7FD252C53603A150B7E7");
+ if (!krbtgt_bytes) {
+ DEBUG(0, ("Could not interpret krbtgt key"));
+ talloc_free(mem_ctx);
+ return False;
+ }
+
/* The machine trust account in use when the above PAC
was generated. It used arcfour-hmac-md5, so this is easy */
E_md4hash("iqvwmii8CuEkyY", server_bytes);
@@ -226,6 +239,21 @@ static BOOL torture_pac_saved_check(void)
return False;
}
+ ret = krb5_keyblock_init(smb_krb5_context->krb5_context,
+ ENCTYPE_ARCFOUR_HMAC,
+ krbtgt_bytes->hash, sizeof(krbtgt_bytes->hash),
+ &krbtgt_keyblock);
+ if (ret) {
+ DEBUG(1, ("Server Keyblock encoding failed: %s\n",
+ smb_get_krb5_error_message(smb_krb5_context->krb5_context,
+ ret, mem_ctx)));
+
+ krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
+ &server_keyblock);
+ talloc_free(mem_ctx);
+ return False;
+ }
+
tmp_blob = data_blob_const(saved_pac, sizeof(saved_pac));
/*tmp_blob.data = file_load(lp_parm_string(-1,"torture","pac_file"), &tmp_blob.length);*/
@@ -236,10 +264,13 @@ static BOOL torture_pac_saved_check(void)
nt_status = kerberos_decode_pac(mem_ctx, &pac_info,
tmp_blob,
smb_krb5_context,
+ &krbtgt_keyblock,
&server_keyblock);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
+ &krbtgt_keyblock);
+ krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
- if (ret) {
+ if (!NT_STATUS_IS_OK(nt_status)) {
DEBUG(1, ("PAC decoding failed: %s\n",
nt_errstr(nt_status)));
generated by cgit (git 2.34.1) at 2024-12-12 14:47:57 +0000