sasl_sspi: Added HTTP digest response generation code

lib/curl_sasl_sspi.c

@@ -327,16 +327,133 @@ CURLcode Curl_sasl_create_digest_http_message(struct SessionHandle *data,
                                               struct digestdata *digest,
                                               char **outptr, size_t *outlen)
 {
-  (void) data;
+  size_t token_max;
-  (void) userp;
+  CredHandle credentials;
-  (void) passwdp;
+  CtxtHandle context;
-  (void) request;
+  char *resp;
-  (void) uripath;
+  BYTE *output_token;
-  (void) digest;
+  PSecPkgInfo SecurityPackage;
-  (void) outptr;
+  SEC_WINNT_AUTH_IDENTITY identity;
-  (void) outlen;
+  SEC_WINNT_AUTH_IDENTITY *p_identity;
+  SecBuffer chlg_buf[3];
+  SecBuffer resp_buf;
+  SecBufferDesc chlg_desc;
+  SecBufferDesc resp_desc;
+  SECURITY_STATUS status;
+  unsigned long attrs;
+  TimeStamp expiry; /* For Windows 9x compatibility of SSPI calls */
 
-  return CURLE_NOT_BUILT_IN;
+  /* Query the security package for DigestSSP */
+  status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) TEXT(SP_NAME_DIGEST),
+                                              &SecurityPackage);
+  if(status != SEC_E_OK)
+    return CURLE_NOT_BUILT_IN;
+
+  token_max = SecurityPackage->cbMaxToken;
+
+  /* Release the package buffer as it is not required anymore */
+  s_pSecFn->FreeContextBuffer(SecurityPackage);
+
+  /* Allocate the output buffer according to the max token size as indicated
+     by the security package */
+  output_token = malloc(token_max);
+  if(!output_token)
+    return CURLE_OUT_OF_MEMORY;
+
+  if(userp && *userp) {
+    /* Populate our identity structure */
+    if(Curl_create_sspi_identity(userp, passwdp, &identity))
+      return CURLE_OUT_OF_MEMORY;
+
+    /* Allow proper cleanup of the identity structure */
+    p_identity = &identity;
+  }
+  else
+    /* Use the current Windows user */
+    p_identity = NULL;
+
+  /* Acquire our credentials handle */
+  status = s_pSecFn->AcquireCredentialsHandle(NULL,
+                                              (TCHAR *) TEXT(SP_NAME_DIGEST),
+                                              SECPKG_CRED_OUTBOUND, NULL,
+                                              p_identity, NULL, NULL,
+                                              &credentials, &expiry);
+  if(status != SEC_E_OK) {
+    Curl_safefree(output_token);
+
+    return CURLE_LOGIN_DENIED;
+  }
+
+  /* Setup the challenge "input" security buffer if present */
+  chlg_desc.ulVersion    = SECBUFFER_VERSION;
+  chlg_desc.cBuffers     = 3;
+  chlg_desc.pBuffers     = chlg_buf;
+  chlg_buf[0].BufferType = SECBUFFER_TOKEN;
+  chlg_buf[0].pvBuffer   = digest->input_token;
+  chlg_buf[0].cbBuffer   = curlx_uztoul(strlen((const char *)
+                                                digest->input_token));
+  chlg_buf[1].BufferType = SECBUFFER_PKG_PARAMS;
+  chlg_buf[1].pvBuffer   = (void *)request;
+  chlg_buf[1].cbBuffer   = curlx_uztoul(strlen((const char *) request));
+  chlg_buf[2].BufferType = SECBUFFER_PKG_PARAMS;
+  chlg_buf[2].pvBuffer   = NULL;
+  chlg_buf[2].cbBuffer   = 0;
+
+  /* Setup the response "output" security buffer */
+  resp_desc.ulVersion = SECBUFFER_VERSION;
+  resp_desc.cBuffers  = 1;
+  resp_desc.pBuffers  = &resp_buf;
+  resp_buf.BufferType = SECBUFFER_TOKEN;
+  resp_buf.pvBuffer   = output_token;
+  resp_buf.cbBuffer   = curlx_uztoul(token_max);
+
+  /* Generate our reponse message */
+  status = s_pSecFn->InitializeSecurityContext(&credentials, NULL,
+                                               (TCHAR *) uripath,
+                                               ISC_REQ_USE_HTTP_STYLE, 0, 0,
+                                               &chlg_desc, 0, &context,
+                                               &resp_desc, &attrs, &expiry);
+
+  if(status == SEC_I_COMPLETE_NEEDED ||
+     status == SEC_I_COMPLETE_AND_CONTINUE)
+    s_pSecFn->CompleteAuthToken(&credentials, &resp_desc);
+  else if(status != SEC_E_OK && status != SEC_I_CONTINUE_NEEDED) {
+    s_pSecFn->FreeCredentialsHandle(&credentials);
+
+    Curl_safefree(output_token);
+
+    return CURLE_OUT_OF_MEMORY;
+  }
+
+  resp = malloc(resp_buf.cbBuffer + 1);
+  if(!resp) {
+    s_pSecFn->DeleteSecurityContext(&context);
+    s_pSecFn->FreeCredentialsHandle(&credentials);
+
+    Curl_safefree(output_token);
+
+    return CURLE_OUT_OF_MEMORY;
+  }
+
+  /* Copy the generated reponse */
+  memcpy(resp, resp_buf.pvBuffer, resp_buf.cbBuffer);
+  resp[resp_buf.cbBuffer] = 0x00;
+
+  /* Return the response */
+  *outptr = resp;
+  *outlen = resp_buf.cbBuffer;
+
+  /* Free our handles */
+  s_pSecFn->DeleteSecurityContext(&context);
+  s_pSecFn->FreeCredentialsHandle(&credentials);
+
+  /* Free the identity structure */
+  Curl_sspi_free_identity(p_identity);
+
+  /* Free the response buffer */
+  Curl_safefree(output_token);
+
+  return CURLE_OK;
 }
 
 /*