--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/curl/lib/vauth/digest_sspi.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,680 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 2014 - 2016, Steve Holme, <steve_holme@hotmail.com>.
+ * Copyright (C) 2015 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * RFC2831 DIGEST-MD5 authentication
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#if defined(USE_WINDOWS_SSPI) && !defined(CURL_DISABLE_CRYPTO_AUTH)
+
+#include <curl/curl.h>
+
+#include "vauth/vauth.h"
+#include "vauth/digest.h"
+#include "urldata.h"
+#include "curl_base64.h"
+#include "warnless.h"
+#include "curl_multibyte.h"
+#include "sendf.h"
+#include "strdup.h"
+#include "strcase.h"
+
+/* The last #include files should be: */
+#include "curl_memory.h"
+#include "memdebug.h"
+
+/*
+* Curl_auth_is_digest_supported()
+*
+* This is used to evaluate if DIGEST is supported.
+*
+* Parameters: None
+*
+* Returns TRUE if DIGEST is supported by Windows SSPI.
+*/
+bool Curl_auth_is_digest_supported(void)
+{
+  PSecPkgInfo SecurityPackage;
+  SECURITY_STATUS status;
+
+  /* Query the security package for Digest */
+  status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) TEXT(SP_NAME_DIGEST),
+                                              &SecurityPackage);
+
+  /* Release the package buffer as it is not required anymore */
+  if(status == SEC_E_OK) {
+    s_pSecFn->FreeContextBuffer(SecurityPackage);
+  }
+
+  return (status == SEC_E_OK ? TRUE : FALSE);
+}
+
+/*
+ * Curl_auth_create_digest_md5_message()
+ *
+ * This is used to generate an already encoded DIGEST-MD5 response message
+ * ready for sending to the recipient.
+ *
+ * Parameters:
+ *
+ * data    [in]     - The session handle.
+ * chlg64  [in]     - The base64 encoded challenge message.
+ * userp   [in]     - The user name in the format User or Domain\User.
+ * passwdp [in]     - The user's password.
+ * service [in]     - The service type such as http, smtp, pop or imap.
+ * outptr  [in/out] - The address where a pointer to newly allocated memory
+ *                    holding the result will be stored upon completion.
+ * outlen  [out]    - The length of the output message.
+ *
+ * Returns CURLE_OK on success.
+ */
+CURLcode Curl_auth_create_digest_md5_message(struct Curl_easy *data,
+                                             const char *chlg64,
+                                             const char *userp,
+                                             const char *passwdp,
+                                             const char *service,
+                                             char **outptr, size_t *outlen)
+{
+  CURLcode result = CURLE_OK;
+  TCHAR *spn = NULL;
+  size_t chlglen = 0;
+  size_t token_max = 0;
+  unsigned char *input_token = NULL;
+  unsigned char *output_token = NULL;
+  CredHandle credentials;
+  CtxtHandle context;
+  PSecPkgInfo SecurityPackage;
+  SEC_WINNT_AUTH_IDENTITY identity;
+  SEC_WINNT_AUTH_IDENTITY *p_identity;
+  SecBuffer chlg_buf;
+  SecBuffer resp_buf;
+  SecBufferDesc chlg_desc;
+  SecBufferDesc resp_desc;
+  SECURITY_STATUS status;
+  unsigned long attrs;
+  TimeStamp expiry; /* For Windows 9x compatibility of SSPI calls */
+
+  /* Decode the base-64 encoded challenge message */
+  if(strlen(chlg64) && *chlg64 != '=') {
+    result = Curl_base64_decode(chlg64, &input_token, &chlglen);
+    if(result)
+      return result;
+  }
+
+  /* Ensure we have a valid challenge message */
+  if(!input_token) {
+    infof(data, "DIGEST-MD5 handshake failure (empty challenge message)\n");
+
+    return CURLE_BAD_CONTENT_ENCODING;
+  }
+
+  /* Query the security package for DigestSSP */
+  status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) TEXT(SP_NAME_DIGEST),
+                                              &SecurityPackage);
+  if(status != SEC_E_OK) {
+    free(input_token);
+
+    return CURLE_NOT_BUILT_IN;
+  }
+
+  token_max = SecurityPackage->cbMaxToken;
+
+  /* Release the package buffer as it is not required anymore */
+  s_pSecFn->FreeContextBuffer(SecurityPackage);
+
+  /* Allocate our response buffer */
+  output_token = malloc(token_max);
+  if(!output_token) {
+    free(input_token);
+
+    return CURLE_OUT_OF_MEMORY;
+  }
+
+  /* Generate our SPN */
+  spn = Curl_auth_build_spn(service, data->conn->host.name, NULL);
+  if(!spn) {
+    free(output_token);
+    free(input_token);
+
+    return CURLE_OUT_OF_MEMORY;
+  }
+
+  if(userp && *userp) {
+    /* Populate our identity structure */
+    result = Curl_create_sspi_identity(userp, passwdp, &identity);
+    if(result) {
+      free(spn);
+      free(output_token);
+      free(input_token);
+
+      return result;
+    }
+
+    /* 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_sspi_free_identity(p_identity);
+    free(spn);
+    free(output_token);
+    free(input_token);
+
+    return CURLE_LOGIN_DENIED;
+  }
+
+  /* Setup the challenge "input" security buffer */
+  chlg_desc.ulVersion = SECBUFFER_VERSION;
+  chlg_desc.cBuffers  = 1;
+  chlg_desc.pBuffers  = &chlg_buf;
+  chlg_buf.BufferType = SECBUFFER_TOKEN;
+  chlg_buf.pvBuffer   = input_token;
+  chlg_buf.cbBuffer   = curlx_uztoul(chlglen);
+
+  /* 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 response message */
+  status = s_pSecFn->InitializeSecurityContext(&credentials, NULL, spn,
+                                               0, 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_sspi_free_identity(p_identity);
+    free(spn);
+    free(output_token);
+    free(input_token);
+
+    if(status == SEC_E_INSUFFICIENT_MEMORY)
+      return CURLE_OUT_OF_MEMORY;
+
+    return CURLE_AUTH_ERROR;
+  }
+
+  /* Base64 encode the response */
+  result = Curl_base64_encode(data, (char *) output_token, resp_buf.cbBuffer,
+                              outptr, outlen);
+
+  /* Free our handles */
+  s_pSecFn->DeleteSecurityContext(&context);
+  s_pSecFn->FreeCredentialsHandle(&credentials);
+
+  /* Free the identity structure */
+  Curl_sspi_free_identity(p_identity);
+
+  /* Free the SPN */
+  free(spn);
+
+  /* Free the response buffer */
+  free(output_token);
+
+  /* Free the decoded challenge message */
+  free(input_token);
+
+  return result;
+}
+
+/*
+ * Curl_override_sspi_http_realm()
+ *
+ * This is used to populate the domain in a SSPI identity structure
+ * The realm is extracted from the challenge message and used as the
+ * domain if it is not already explicitly set.
+ *
+ * Parameters:
+ *
+ * chlg     [in]     - The challenge message.
+ * identity [in/out] - The identity structure.
+ *
+ * Returns CURLE_OK on success.
+ */
+CURLcode Curl_override_sspi_http_realm(const char *chlg,
+                                       SEC_WINNT_AUTH_IDENTITY *identity)
+{
+  xcharp_u domain, dup_domain;
+
+  /* If domain is blank or unset, check challenge message for realm */
+  if(!identity->Domain || !identity->DomainLength) {
+    for(;;) {
+      char value[DIGEST_MAX_VALUE_LENGTH];
+      char content[DIGEST_MAX_CONTENT_LENGTH];
+
+      /* Pass all additional spaces here */
+      while(*chlg && ISSPACE(*chlg))
+        chlg++;
+
+      /* Extract a value=content pair */
+      if(Curl_auth_digest_get_pair(chlg, value, content, &chlg)) {
+        if(strcasecompare(value, "realm")) {
+
+          /* Setup identity's domain and length */
+          domain.tchar_ptr = Curl_convert_UTF8_to_tchar((char *) content);
+          if(!domain.tchar_ptr)
+            return CURLE_OUT_OF_MEMORY;
+
+          dup_domain.tchar_ptr = _tcsdup(domain.tchar_ptr);
+          if(!dup_domain.tchar_ptr) {
+            Curl_unicodefree(domain.tchar_ptr);
+            return CURLE_OUT_OF_MEMORY;
+          }
+
+          free(identity->Domain);
+          identity->Domain = dup_domain.tbyte_ptr;
+          identity->DomainLength = curlx_uztoul(_tcslen(dup_domain.tchar_ptr));
+          dup_domain.tchar_ptr = NULL;
+
+          Curl_unicodefree(domain.tchar_ptr);
+        }
+        else {
+          /* Unknown specifier, ignore it! */
+        }
+      }
+      else
+        break; /* We're done here */
+
+      /* Pass all additional spaces here */
+      while(*chlg && ISSPACE(*chlg))
+        chlg++;
+
+      /* Allow the list to be comma-separated */
+      if(',' == *chlg)
+        chlg++;
+    }
+  }
+
+  return CURLE_OK;
+}
+
+/*
+ * Curl_auth_decode_digest_http_message()
+ *
+ * This is used to decode a HTTP DIGEST challenge message into the separate
+ * attributes.
+ *
+ * Parameters:
+ *
+ * chlg    [in]     - The challenge message.
+ * digest  [in/out] - The digest data struct being used and modified.
+ *
+ * Returns CURLE_OK on success.
+ */
+CURLcode Curl_auth_decode_digest_http_message(const char *chlg,
+                                              struct digestdata *digest)
+{
+  size_t chlglen = strlen(chlg);
+
+  /* We had an input token before so if there's another one now that means we
+     provided bad credentials in the previous request or it's stale. */
+  if(digest->input_token) {
+    bool stale = false;
+    const char *p = chlg;
+
+    /* Check for the 'stale' directive */
+    for(;;) {
+      char value[DIGEST_MAX_VALUE_LENGTH];
+      char content[DIGEST_MAX_CONTENT_LENGTH];
+
+      while(*p && ISSPACE(*p))
+        p++;
+
+      if(!Curl_auth_digest_get_pair(p, value, content, &p))
+        break;
+
+      if(strcasecompare(value, "stale") &&
+         strcasecompare(content, "true")) {
+        stale = true;
+        break;
+      }
+
+      while(*p && ISSPACE(*p))
+        p++;
+
+      if(',' == *p)
+        p++;
+    }
+
+    if(stale)
+      Curl_auth_digest_cleanup(digest);
+    else
+      return CURLE_LOGIN_DENIED;
+  }
+
+  /* Store the challenge for use later */
+  digest->input_token = (BYTE *) Curl_memdup(chlg, chlglen + 1);
+  if(!digest->input_token)
+    return CURLE_OUT_OF_MEMORY;
+
+  digest->input_token_len = chlglen;
+
+  return CURLE_OK;
+}
+
+/*
+ * Curl_auth_create_digest_http_message()
+ *
+ * This is used to generate a HTTP DIGEST response message ready for sending
+ * to the recipient.
+ *
+ * Parameters:
+ *
+ * data    [in]     - The session handle.
+ * userp   [in]     - The user name in the format User or Domain\User.
+ * passwdp [in]     - The user's password.
+ * request [in]     - The HTTP request.
+ * uripath [in]     - The path of the HTTP uri.
+ * digest  [in/out] - The digest data struct being used and modified.
+ * outptr  [in/out] - The address where a pointer to newly allocated memory
+ *                    holding the result will be stored upon completion.
+ * outlen  [out]    - The length of the output message.
+ *
+ * Returns CURLE_OK on success.
+ */
+CURLcode Curl_auth_create_digest_http_message(struct Curl_easy *data,
+                                              const char *userp,
+                                              const char *passwdp,
+                                              const unsigned char *request,
+                                              const unsigned char *uripath,
+                                              struct digestdata *digest,
+                                              char **outptr, size_t *outlen)
+{
+  size_t token_max;
+  char *resp;
+  BYTE *output_token;
+  size_t output_token_len = 0;
+  PSecPkgInfo SecurityPackage;
+  SecBuffer chlg_buf[5];
+  SecBufferDesc chlg_desc;
+  SECURITY_STATUS status;
+
+  (void) data;
+
+  /* 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 the user/passwd that was used to make the identity for http_context
+     has changed then delete that context. */
+  if((userp && !digest->user) || (!userp && digest->user) ||
+     (passwdp && !digest->passwd) || (!passwdp && digest->passwd) ||
+     (userp && digest->user && strcmp(userp, digest->user)) ||
+     (passwdp && digest->passwd && strcmp(passwdp, digest->passwd))) {
+    if(digest->http_context) {
+      s_pSecFn->DeleteSecurityContext(digest->http_context);
+      Curl_safefree(digest->http_context);
+    }
+    Curl_safefree(digest->user);
+    Curl_safefree(digest->passwd);
+  }
+
+  if(digest->http_context) {
+    chlg_desc.ulVersion    = SECBUFFER_VERSION;
+    chlg_desc.cBuffers     = 5;
+    chlg_desc.pBuffers     = chlg_buf;
+    chlg_buf[0].BufferType = SECBUFFER_TOKEN;
+    chlg_buf[0].pvBuffer   = NULL;
+    chlg_buf[0].cbBuffer   = 0;
+    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   = (void *) uripath;
+    chlg_buf[2].cbBuffer   = curlx_uztoul(strlen((const char *) uripath));
+    chlg_buf[3].BufferType = SECBUFFER_PKG_PARAMS;
+    chlg_buf[3].pvBuffer   = NULL;
+    chlg_buf[3].cbBuffer   = 0;
+    chlg_buf[4].BufferType = SECBUFFER_PADDING;
+    chlg_buf[4].pvBuffer   = output_token;
+    chlg_buf[4].cbBuffer   = curlx_uztoul(token_max);
+
+    status = s_pSecFn->MakeSignature(digest->http_context, 0, &chlg_desc, 0);
+    if(status == SEC_E_OK)
+      output_token_len = chlg_buf[4].cbBuffer;
+    else { /* delete the context so a new one can be made */
+      infof(data, "digest_sspi: MakeSignature failed, error 0x%08lx\n",
+            (long)status);
+      s_pSecFn->DeleteSecurityContext(digest->http_context);
+      Curl_safefree(digest->http_context);
+    }
+  }
+
+  if(!digest->http_context) {
+    CredHandle credentials;
+    SEC_WINNT_AUTH_IDENTITY identity;
+    SEC_WINNT_AUTH_IDENTITY *p_identity;
+    SecBuffer resp_buf;
+    SecBufferDesc resp_desc;
+    unsigned long attrs;
+    TimeStamp expiry; /* For Windows 9x compatibility of SSPI calls */
+    TCHAR *spn;
+
+    /* free the copy of user/passwd used to make the previous identity */
+    Curl_safefree(digest->user);
+    Curl_safefree(digest->passwd);
+
+    if(userp && *userp) {
+      /* Populate our identity structure */
+      if(Curl_create_sspi_identity(userp, passwdp, &identity)) {
+        free(output_token);
+        return CURLE_OUT_OF_MEMORY;
+      }
+
+      /* Populate our identity domain */
+      if(Curl_override_sspi_http_realm((const char *) digest->input_token,
+                                       &identity)) {
+        free(output_token);
+        return CURLE_OUT_OF_MEMORY;
+      }
+
+      /* Allow proper cleanup of the identity structure */
+      p_identity = &identity;
+    }
+    else
+      /* Use the current Windows user */
+      p_identity = NULL;
+
+    if(userp) {
+      digest->user = strdup(userp);
+
+      if(!digest->user) {
+        free(output_token);
+        return CURLE_OUT_OF_MEMORY;
+      }
+    }
+
+    if(passwdp) {
+      digest->passwd = strdup(passwdp);
+
+      if(!digest->passwd) {
+        free(output_token);
+        Curl_safefree(digest->user);
+        return CURLE_OUT_OF_MEMORY;
+      }
+    }
+
+    /* 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_sspi_free_identity(p_identity);
+      free(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(digest->input_token_len);
+    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);
+
+    spn = Curl_convert_UTF8_to_tchar((char *) uripath);
+    if(!spn) {
+      s_pSecFn->FreeCredentialsHandle(&credentials);
+
+      Curl_sspi_free_identity(p_identity);
+      free(output_token);
+
+      return CURLE_OUT_OF_MEMORY;
+    }
+
+    /* Allocate our new context handle */
+    digest->http_context = calloc(1, sizeof(CtxtHandle));
+    if(!digest->http_context)
+      return CURLE_OUT_OF_MEMORY;
+
+    /* Generate our response message */
+    status = s_pSecFn->InitializeSecurityContext(&credentials, NULL,
+                                                 spn,
+                                                 ISC_REQ_USE_HTTP_STYLE, 0, 0,
+                                                 &chlg_desc, 0,
+                                                 digest->http_context,
+                                                 &resp_desc, &attrs, &expiry);
+    Curl_unicodefree(spn);
+
+    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_sspi_free_identity(p_identity);
+      free(output_token);
+
+      Curl_safefree(digest->http_context);
+
+      if(status == SEC_E_INSUFFICIENT_MEMORY)
+        return CURLE_OUT_OF_MEMORY;
+
+      return CURLE_AUTH_ERROR;
+    }
+
+    output_token_len = resp_buf.cbBuffer;
+
+    s_pSecFn->FreeCredentialsHandle(&credentials);
+    Curl_sspi_free_identity(p_identity);
+  }
+
+  resp = malloc(output_token_len + 1);
+  if(!resp) {
+    free(output_token);
+
+    return CURLE_OUT_OF_MEMORY;
+  }
+
+  /* Copy the generated response */
+  memcpy(resp, output_token, output_token_len);
+  resp[output_token_len] = 0;
+
+  /* Return the response */
+  *outptr = resp;
+  *outlen = output_token_len;
+
+  /* Free the response buffer */
+  free(output_token);
+
+  return CURLE_OK;
+}
+
+/*
+ * Curl_auth_digest_cleanup()
+ *
+ * This is used to clean up the digest specific data.
+ *
+ * Parameters:
+ *
+ * digest    [in/out] - The digest data struct being cleaned up.
+ *
+ */
+void Curl_auth_digest_cleanup(struct digestdata *digest)
+{
+  /* Free the input token */
+  Curl_safefree(digest->input_token);
+
+  /* Reset any variables */
+  digest->input_token_len = 0;
+
+  /* Delete security context */
+  if(digest->http_context) {
+    s_pSecFn->DeleteSecurityContext(digest->http_context);
+    Curl_safefree(digest->http_context);
+  }
+
+  /* Free the copy of user/passwd used to make the identity for http_context */
+  Curl_safefree(digest->user);
+  Curl_safefree(digest->passwd);
+}
+
+#endif /* USE_WINDOWS_SSPI && !CURL_DISABLE_CRYPTO_AUTH */