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-rw-r--r--source4/dsdb/samdb/cracknames.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/source4/dsdb/samdb/cracknames.c b/source4/dsdb/samdb/cracknames.c
index d31311bd1d..119dd92355 100644
--- a/source4/dsdb/samdb/cracknames.c
+++ b/source4/dsdb/samdb/cracknames.c
@@ -560,6 +560,7 @@ WERROR DsCrackNameOneName(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
return WERR_NOMEM;
}
+ /* Ensure we reject compleate junk first */
ret = krb5_parse_name(smb_krb5_context->krb5_context, name, &principal);
if (ret) {
info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
@@ -568,6 +569,7 @@ WERROR DsCrackNameOneName(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
domain_filter = NULL;
+ /* By getting the unparsed name here, we ensure the escaping is correct (and trust the client less) */
ret = krb5_unparse_name(smb_krb5_context->krb5_context, principal, &unparsed_name);
if (ret) {
krb5_free_principal(smb_krb5_context->krb5_context, principal);
@@ -575,6 +577,8 @@ WERROR DsCrackNameOneName(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
}
krb5_free_principal(smb_krb5_context->krb5_context, principal);
+
+ /* The ldb_binary_encode_string() here avoid LDAP filter injection attacks */
result_filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(userPrincipalName=%s))",
ldb_binary_encode_string(mem_ctx, unparsed_name));