Add m-esr52 at 52.6.0

1 files changed, 722 insertions, 0 deletions

diff --git a/netwerk/protocol/http/nsHttpDigestAuth.cpp b/netwerk/protocol/http/nsHttpDigestAuth.cpp
new file mode 100644
index 000000000..235f391bc
--- /dev/null
+++ b/netwerk/protocol/http/nsHttpDigestAuth.cpp
@@ -0,0 +1,722 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// HttpLog.h should generally be included first
+#include "HttpLog.h"
+
+#include "mozilla/Sprintf.h"
+
+#include "nsHttp.h"
+#include "nsHttpDigestAuth.h"
+#include "nsIHttpAuthenticableChannel.h"
+#include "nsISupportsPrimitives.h"
+#include "nsIURI.h"
+#include "nsString.h"
+#include "nsEscape.h"
+#include "nsNetCID.h"
+#include "nsCRT.h"
+#include "nsICryptoHash.h"
+#include "nsComponentManagerUtils.h"
+
+namespace mozilla {
+namespace net {
+
+//-----------------------------------------------------------------------------
+// nsHttpDigestAuth <public>
+//-----------------------------------------------------------------------------
+
+nsHttpDigestAuth::nsHttpDigestAuth()
+{}
+
+nsHttpDigestAuth::~nsHttpDigestAuth()
+{}
+
+//-----------------------------------------------------------------------------
+// nsHttpDigestAuth::nsISupports
+//-----------------------------------------------------------------------------
+
+NS_IMPL_ISUPPORTS(nsHttpDigestAuth, nsIHttpAuthenticator)
+
+//-----------------------------------------------------------------------------
+// nsHttpDigestAuth <protected>
+//-----------------------------------------------------------------------------
+
+nsresult
+nsHttpDigestAuth::MD5Hash(const char *buf, uint32_t len)
+{
+  nsresult rv;
+
+  // Cache a reference to the nsICryptoHash instance since we'll be calling
+  // this function frequently.
+  if (!mVerifier) {
+    mVerifier = do_CreateInstance(NS_CRYPTO_HASH_CONTRACTID, &rv);
+    if (NS_FAILED(rv)) {
+      LOG(("nsHttpDigestAuth: no crypto hash!\n"));
+      return rv;
+    }
+  }
+
+  rv = mVerifier->Init(nsICryptoHash::MD5);
+  if (NS_FAILED(rv)) return rv;
+
+  rv = mVerifier->Update((unsigned char*)buf, len);
+  if (NS_FAILED(rv)) return rv;
+
+  nsAutoCString hashString;
+  rv = mVerifier->Finish(false, hashString);
+  if (NS_FAILED(rv)) return rv;
+
+  NS_ENSURE_STATE(hashString.Length() == sizeof(mHashBuf));
+  memcpy(mHashBuf, hashString.get(), hashString.Length());
+
+  return rv;
+}
+
+nsresult
+nsHttpDigestAuth::GetMethodAndPath(nsIHttpAuthenticableChannel *authChannel,
+                                   bool                         isProxyAuth,
+                                   nsCString                   &httpMethod,
+                                   nsCString                   &path)
+{
+  nsresult rv, rv2;
+  nsCOMPtr<nsIURI> uri;
+  rv = authChannel->GetURI(getter_AddRefs(uri));
+  if (NS_SUCCEEDED(rv)) {
+    bool proxyMethodIsConnect;
+    rv = authChannel->GetProxyMethodIsConnect(&proxyMethodIsConnect);
+    if (NS_SUCCEEDED(rv)) {
+      if (proxyMethodIsConnect && isProxyAuth) {
+        httpMethod.AssignLiteral("CONNECT");
+        //
+        // generate hostname:port string. (unfortunately uri->GetHostPort
+        // leaves out the port if it matches the default value, so we can't
+        // just call it.)
+        //
+        int32_t port;
+        rv = uri->GetAsciiHost(path);
+        rv2 = uri->GetPort(&port);
+        if (NS_SUCCEEDED(rv) && NS_SUCCEEDED(rv2)) {
+          path.Append(':');
+          path.AppendInt(port < 0 ? NS_HTTPS_DEFAULT_PORT : port);
+        }
+      }
+      else {
+        rv = authChannel->GetRequestMethod(httpMethod);
+        rv2 = uri->GetPath(path);
+        if (NS_SUCCEEDED(rv) && NS_SUCCEEDED(rv2)) {
+          //
+          // strip any fragment identifier from the URL path.
+          //
+          int32_t ref = path.RFindChar('#');
+          if (ref != kNotFound)
+            path.Truncate(ref);
+          //
+          // make sure we escape any UTF-8 characters in the URI path.  the
+          // digest auth uri attribute needs to match the request-URI.
+          //
+          // XXX we should really ask the HTTP channel for this string
+          // instead of regenerating it here.
+          //
+          nsAutoCString buf;
+          rv = NS_EscapeURL(path, esc_OnlyNonASCII, buf, mozilla::fallible);
+          if (NS_SUCCEEDED(rv)) {
+            path = buf;
+          }
+        }
+      }
+    }
+  }
+  return rv;
+}
+
+//-----------------------------------------------------------------------------
+// nsHttpDigestAuth::nsIHttpAuthenticator
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+nsHttpDigestAuth::ChallengeReceived(nsIHttpAuthenticableChannel *authChannel,
+                                    const char *challenge,
+                                    bool isProxyAuth,
+                                    nsISupports **sessionState,
+                                    nsISupports **continuationState,
+                                    bool *result)
+{
+  nsAutoCString realm, domain, nonce, opaque;
+  bool stale;
+  uint16_t algorithm, qop;
+
+  nsresult rv = ParseChallenge(challenge, realm, domain, nonce, opaque,
+                               &stale, &algorithm, &qop);
+  if (NS_FAILED(rv)) return rv;
+
+  // if the challenge has the "stale" flag set, then the user identity is not
+  // necessarily invalid.  by returning FALSE here we can suppress username
+  // and password prompting that usually accompanies a 401/407 challenge.
+  *result = !stale;
+
+  // clear any existing nonce_count since we have a new challenge.
+  NS_IF_RELEASE(*sessionState);
+  return NS_OK;
+}
+
+
+NS_IMETHODIMP
+nsHttpDigestAuth::GenerateCredentialsAsync(nsIHttpAuthenticableChannel *authChannel,
+                                           nsIHttpAuthenticatorCallback* aCallback,
+                                           const char *challenge,
+                                           bool isProxyAuth,
+                                           const char16_t *domain,
+                                           const char16_t *username,
+                                           const char16_t *password,
+                                           nsISupports *sessionState,
+                                           nsISupports *continuationState,
+                                           nsICancelable **aCancellable)
+{
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsHttpDigestAuth::GenerateCredentials(nsIHttpAuthenticableChannel *authChannel,
+                                      const char *challenge,
+                                      bool isProxyAuth,
+                                      const char16_t *userdomain,
+                                      const char16_t *username,
+                                      const char16_t *password,
+                                      nsISupports **sessionState,
+                                      nsISupports **continuationState,
+                                      uint32_t *aFlags,
+                                      char **creds)
+
+{
+  LOG(("nsHttpDigestAuth::GenerateCredentials [challenge=%s]\n", challenge));
+
+  NS_ENSURE_ARG_POINTER(creds);
+
+  *aFlags = 0;
+
+  bool isDigestAuth = !PL_strncasecmp(challenge, "digest ", 7);
+  NS_ENSURE_TRUE(isDigestAuth, NS_ERROR_UNEXPECTED);
+
+  // IIS implementation requires extra quotes
+  bool requireExtraQuotes = false;
+  {
+    nsAutoCString serverVal;
+    authChannel->GetServerResponseHeader(serverVal);
+    if (!serverVal.IsEmpty()) {
+      requireExtraQuotes = !PL_strncasecmp(serverVal.get(), "Microsoft-IIS", 13);
+    }
+  }
+
+  nsresult rv;
+  nsAutoCString httpMethod;
+  nsAutoCString path;
+  rv = GetMethodAndPath(authChannel, isProxyAuth, httpMethod, path);
+  if (NS_FAILED(rv)) return rv;
+
+  nsAutoCString realm, domain, nonce, opaque;
+  bool stale;
+  uint16_t algorithm, qop;
+
+  rv = ParseChallenge(challenge, realm, domain, nonce, opaque,
+                      &stale, &algorithm, &qop);
+  if (NS_FAILED(rv)) {
+    LOG(("nsHttpDigestAuth::GenerateCredentials [ParseChallenge failed rv=%x]\n", rv));
+    return rv;
+  }
+
+  char ha1_digest[EXPANDED_DIGEST_LENGTH+1];
+  char ha2_digest[EXPANDED_DIGEST_LENGTH+1];
+  char response_digest[EXPANDED_DIGEST_LENGTH+1];
+  char upload_data_digest[EXPANDED_DIGEST_LENGTH+1];
+
+  if (qop & QOP_AUTH_INT) {
+    // we do not support auth-int "quality of protection" currently
+    qop &= ~QOP_AUTH_INT;
+
+    NS_WARNING("no support for Digest authentication with data integrity quality of protection");
+
+    /* TODO: to support auth-int, we need to get an MD5 digest of
+     * TODO: the data uploaded with this request.
+     * TODO: however, i am not sure how to read in the file in without
+     * TODO: disturbing the channel''s use of it. do i need to copy it
+     * TODO: somehow?
+     */
+#if 0
+    if (http_channel != nullptr)
+    {
+      nsIInputStream * upload;
+      nsCOMPtr<nsIUploadChannel> uc = do_QueryInterface(http_channel);
+      NS_ENSURE_TRUE(uc, NS_ERROR_UNEXPECTED);
+      uc->GetUploadStream(&upload);
+      if (upload) {
+        char * upload_buffer;
+        int upload_buffer_length = 0;
+        //TODO: read input stream into buffer
+        const char * digest = (const char*)
+        nsNetwerkMD5Digest(upload_buffer, upload_buffer_length);
+        ExpandToHex(digest, upload_data_digest);
+        NS_RELEASE(upload);
+      }
+    }
+#endif
+  }
+
+  if (!(algorithm & ALGO_MD5 || algorithm & ALGO_MD5_SESS)) {
+    // they asked only for algorithms that we do not support
+    NS_WARNING("unsupported algorithm requested by Digest authentication");
+    return NS_ERROR_NOT_IMPLEMENTED;
+  }
+
+  //
+  // the following are for increasing security.  see RFC 2617 for more
+  // information.
+  //
+  // nonce_count allows the server to keep track of auth challenges (to help
+  // prevent spoofing). we increase this count every time.
+  //
+  char nonce_count[NONCE_COUNT_LENGTH+1] = "00000001"; // in hex
+  if (*sessionState) {
+    nsCOMPtr<nsISupportsPRUint32> v(do_QueryInterface(*sessionState));
+    if (v) {
+      uint32_t nc;
+      v->GetData(&nc);
+      SprintfLiteral(nonce_count, "%08x", ++nc);
+      v->SetData(nc);
+    }
+  }
+  else {
+    nsCOMPtr<nsISupportsPRUint32> v(
+            do_CreateInstance(NS_SUPPORTS_PRUINT32_CONTRACTID));
+    if (v) {
+      v->SetData(1);
+      v.forget(sessionState);
+    }
+  }
+  LOG(("   nonce_count=%s\n", nonce_count));
+
+  //
+  // this lets the client verify the server response (via a server
+  // returned Authentication-Info header). also used for session info.
+  //
+  nsAutoCString cnonce;
+  static const char hexChar[] = "0123456789abcdef";
+  for (int i=0; i<16; ++i) {
+    cnonce.Append(hexChar[(int)(15.0 * rand()/(RAND_MAX + 1.0))]);
+  }
+  LOG(("   cnonce=%s\n", cnonce.get()));
+
+  //
+  // calculate credentials
+  //
+
+  NS_ConvertUTF16toUTF8 cUser(username), cPass(password);
+  rv = CalculateHA1(cUser, cPass, realm, algorithm, nonce, cnonce, ha1_digest);
+  if (NS_FAILED(rv)) return rv;
+
+  rv = CalculateHA2(httpMethod, path, qop, upload_data_digest, ha2_digest);
+  if (NS_FAILED(rv)) return rv;
+
+  rv = CalculateResponse(ha1_digest, ha2_digest, nonce, qop, nonce_count,
+                         cnonce, response_digest);
+  if (NS_FAILED(rv)) return rv;
+
+  //
+  // Values that need to match the quoted-string production from RFC 2616:
+  //
+  //    username
+  //    realm
+  //    nonce
+  //    opaque
+  //    cnonce
+  //
+
+  nsAutoCString authString;
+
+  authString.AssignLiteral("Digest username=");
+  rv = AppendQuotedString(cUser, authString);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  authString.AppendLiteral(", realm=");
+  rv = AppendQuotedString(realm, authString);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  authString.AppendLiteral(", nonce=");
+  rv = AppendQuotedString(nonce, authString);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  authString.AppendLiteral(", uri=\"");
+  authString += path;
+  if (algorithm & ALGO_SPECIFIED) {
+    authString.AppendLiteral("\", algorithm=");
+    if (algorithm & ALGO_MD5_SESS)
+      authString.AppendLiteral("MD5-sess");
+    else
+      authString.AppendLiteral("MD5");
+  } else {
+    authString += '\"';
+  }
+  authString.AppendLiteral(", response=\"");
+  authString += response_digest;
+  authString += '\"';
+
+  if (!opaque.IsEmpty()) {
+    authString.AppendLiteral(", opaque=");
+    rv = AppendQuotedString(opaque, authString);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  if (qop) {
+    authString.AppendLiteral(", qop=");
+    if (requireExtraQuotes)
+      authString += '\"';
+    authString.AppendLiteral("auth");
+    if (qop & QOP_AUTH_INT)
+      authString.AppendLiteral("-int");
+    if (requireExtraQuotes)
+      authString += '\"';
+    authString.AppendLiteral(", nc=");
+    authString += nonce_count;
+
+    authString.AppendLiteral(", cnonce=");
+    rv = AppendQuotedString(cnonce, authString);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+
+  *creds = ToNewCString(authString);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsHttpDigestAuth::GetAuthFlags(uint32_t *flags)
+{
+  *flags = REQUEST_BASED | REUSABLE_CHALLENGE | IDENTITY_ENCRYPTED;
+  //
+  // NOTE: digest auth credentials must be uniquely computed for each request,
+  //       so we do not set the REUSABLE_CREDENTIALS flag.
+  //
+  return NS_OK;
+}
+
+nsresult
+nsHttpDigestAuth::CalculateResponse(const char * ha1_digest,
+                                    const char * ha2_digest,
+                                    const nsAFlatCString & nonce,
+                                    uint16_t qop,
+                                    const char * nonce_count,
+                                    const nsAFlatCString & cnonce,
+                                    char * result)
+{
+  uint32_t len = 2*EXPANDED_DIGEST_LENGTH + nonce.Length() + 2;
+
+  if (qop & QOP_AUTH || qop & QOP_AUTH_INT) {
+    len += cnonce.Length() + NONCE_COUNT_LENGTH + 3;
+    if (qop & QOP_AUTH_INT)
+      len += 8; // length of "auth-int"
+    else
+      len += 4; // length of "auth"
+  }
+
+  nsAutoCString contents;
+  contents.SetCapacity(len);
+
+  contents.Assign(ha1_digest, EXPANDED_DIGEST_LENGTH);
+  contents.Append(':');
+  contents.Append(nonce);
+  contents.Append(':');
+
+  if (qop & QOP_AUTH || qop & QOP_AUTH_INT) {
+    contents.Append(nonce_count, NONCE_COUNT_LENGTH);
+    contents.Append(':');
+    contents.Append(cnonce);
+    contents.Append(':');
+    if (qop & QOP_AUTH_INT)
+      contents.AppendLiteral("auth-int:");
+    else
+      contents.AppendLiteral("auth:");
+  }
+
+  contents.Append(ha2_digest, EXPANDED_DIGEST_LENGTH);
+
+  nsresult rv = MD5Hash(contents.get(), contents.Length());
+  if (NS_SUCCEEDED(rv))
+    rv = ExpandToHex(mHashBuf, result);
+  return rv;
+}
+
+nsresult
+nsHttpDigestAuth::ExpandToHex(const char * digest, char * result)
+{
+  int16_t index, value;
+
+  for (index = 0; index < DIGEST_LENGTH; index++) {
+    value = (digest[index] >> 4) & 0xf;
+    if (value < 10)
+      result[index*2] = value + '0';
+    else
+      result[index*2] = value - 10 + 'a';
+
+    value = digest[index] & 0xf;
+    if (value < 10)
+      result[(index*2)+1] = value + '0';
+    else
+      result[(index*2)+1] = value - 10 + 'a';
+  }
+
+  result[EXPANDED_DIGEST_LENGTH] = 0;
+  return NS_OK;
+}
+
+nsresult
+nsHttpDigestAuth::CalculateHA1(const nsAFlatCString & username,
+                               const nsAFlatCString & password,
+                               const nsAFlatCString & realm,
+                               uint16_t algorithm,
+                               const nsAFlatCString & nonce,
+                               const nsAFlatCString & cnonce,
+                               char * result)
+{
+  int16_t len = username.Length() + password.Length() + realm.Length() + 2;
+  if (algorithm & ALGO_MD5_SESS) {
+    int16_t exlen = EXPANDED_DIGEST_LENGTH + nonce.Length() + cnonce.Length() + 2;
+    if (exlen > len)
+        len = exlen;
+  }
+
+  nsAutoCString contents;
+  contents.SetCapacity(len + 1);
+
+  contents.Assign(username);
+  contents.Append(':');
+  contents.Append(realm);
+  contents.Append(':');
+  contents.Append(password);
+
+  nsresult rv;
+  rv = MD5Hash(contents.get(), contents.Length());
+  if (NS_FAILED(rv))
+    return rv;
+
+  if (algorithm & ALGO_MD5_SESS) {
+    char part1[EXPANDED_DIGEST_LENGTH+1];
+    ExpandToHex(mHashBuf, part1);
+
+    contents.Assign(part1, EXPANDED_DIGEST_LENGTH);
+    contents.Append(':');
+    contents.Append(nonce);
+    contents.Append(':');
+    contents.Append(cnonce);
+
+    rv = MD5Hash(contents.get(), contents.Length());
+    if (NS_FAILED(rv))
+      return rv;
+  }
+
+  return ExpandToHex(mHashBuf, result);
+}
+
+nsresult
+nsHttpDigestAuth::CalculateHA2(const nsAFlatCString & method,
+                               const nsAFlatCString & path,
+                               uint16_t qop,
+                               const char * bodyDigest,
+                               char * result)
+{
+  uint16_t methodLen = method.Length();
+  uint32_t pathLen = path.Length();
+  uint32_t len = methodLen + pathLen + 1;
+
+  if (qop & QOP_AUTH_INT) {
+    len += EXPANDED_DIGEST_LENGTH + 1;
+  }
+
+  nsAutoCString contents;
+  contents.SetCapacity(len);
+
+  contents.Assign(method);
+  contents.Append(':');
+  contents.Append(path);
+
+  if (qop & QOP_AUTH_INT) {
+    contents.Append(':');
+    contents.Append(bodyDigest, EXPANDED_DIGEST_LENGTH);
+  }
+
+  nsresult rv = MD5Hash(contents.get(), contents.Length());
+  if (NS_SUCCEEDED(rv))
+    rv = ExpandToHex(mHashBuf, result);
+  return rv;
+}
+
+nsresult
+nsHttpDigestAuth::ParseChallenge(const char * challenge,
+                                 nsACString & realm,
+                                 nsACString & domain,
+                                 nsACString & nonce,
+                                 nsACString & opaque,
+                                 bool * stale,
+                                 uint16_t * algorithm,
+                                 uint16_t * qop)
+{
+  // put an absurd, but maximum, length cap on the challenge so
+  // that calculations are 32 bit safe
+  if (strlen(challenge) > 16000000) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  const char *p = challenge + 6; // first 6 characters are "Digest"
+
+  *stale = false;
+  *algorithm = ALGO_MD5; // default is MD5
+  *qop = 0;
+
+  for (;;) {
+    while (*p && (*p == ',' || nsCRT::IsAsciiSpace(*p)))
+      ++p;
+    if (!*p)
+      break;
+
+    // name
+    int32_t nameStart = (p - challenge);
+    while (*p && !nsCRT::IsAsciiSpace(*p) && *p != '=')
+      ++p;
+    if (!*p)
+      return NS_ERROR_INVALID_ARG;
+    int32_t nameLength = (p - challenge) - nameStart;
+
+    while (*p && (nsCRT::IsAsciiSpace(*p) || *p == '='))
+      ++p;
+    if (!*p)
+      return NS_ERROR_INVALID_ARG;
+
+    bool quoted = false;
+    if (*p == '"') {
+      ++p;
+      quoted = true;
+    }
+
+    // value
+    int32_t valueStart = (p - challenge);
+    int32_t valueLength = 0;
+    if (quoted) {
+      while (*p && *p != '"')
+        ++p;
+      if (*p != '"')
+        return NS_ERROR_INVALID_ARG;
+      valueLength = (p - challenge) - valueStart;
+      ++p;
+    } else {
+      while (*p && !nsCRT::IsAsciiSpace(*p) && *p != ',')
+        ++p;
+      valueLength = (p - challenge) - valueStart;
+    }
+
+    // extract information
+    if (nameLength == 5 &&
+        nsCRT::strncasecmp(challenge+nameStart, "realm", 5) == 0)
+    {
+      realm.Assign(challenge+valueStart, valueLength);
+    }
+    else if (nameLength == 6 &&
+        nsCRT::strncasecmp(challenge+nameStart, "domain", 6) == 0)
+    {
+      domain.Assign(challenge+valueStart, valueLength);
+    }
+    else if (nameLength == 5 &&
+        nsCRT::strncasecmp(challenge+nameStart, "nonce", 5) == 0)
+    {
+      nonce.Assign(challenge+valueStart, valueLength);
+    }
+    else if (nameLength == 6 &&
+        nsCRT::strncasecmp(challenge+nameStart, "opaque", 6) == 0)
+    {
+      opaque.Assign(challenge+valueStart, valueLength);
+    }
+    else if (nameLength == 5 &&
+        nsCRT::strncasecmp(challenge+nameStart, "stale", 5) == 0)
+    {
+      if (nsCRT::strncasecmp(challenge+valueStart, "true", 4) == 0)
+        *stale = true;
+      else
+        *stale = false;
+    }
+    else if (nameLength == 9 &&
+        nsCRT::strncasecmp(challenge+nameStart, "algorithm", 9) == 0)
+    {
+      // we want to clear the default, so we use = not |= here
+      *algorithm = ALGO_SPECIFIED;
+      if (valueLength == 3 &&
+          nsCRT::strncasecmp(challenge+valueStart, "MD5", 3) == 0)
+        *algorithm |= ALGO_MD5;
+      else if (valueLength == 8 &&
+          nsCRT::strncasecmp(challenge+valueStart, "MD5-sess", 8) == 0)
+        *algorithm |= ALGO_MD5_SESS;
+    }
+    else if (nameLength == 3 &&
+        nsCRT::strncasecmp(challenge+nameStart, "qop", 3) == 0)
+    {
+      int32_t ipos = valueStart;
+      while (ipos < valueStart+valueLength) {
+        while (ipos < valueStart+valueLength &&
+               (nsCRT::IsAsciiSpace(challenge[ipos]) ||
+                challenge[ipos] == ','))
+          ipos++;
+        int32_t algostart = ipos;
+        while (ipos < valueStart+valueLength &&
+               !nsCRT::IsAsciiSpace(challenge[ipos]) &&
+               challenge[ipos] != ',')
+          ipos++;
+        if ((ipos - algostart) == 4 &&
+            nsCRT::strncasecmp(challenge+algostart, "auth", 4) == 0)
+          *qop |= QOP_AUTH;
+        else if ((ipos - algostart) == 8 &&
+            nsCRT::strncasecmp(challenge+algostart, "auth-int", 8) == 0)
+          *qop |= QOP_AUTH_INT;
+      }
+    }
+  }
+  return NS_OK;
+}
+
+nsresult
+nsHttpDigestAuth::AppendQuotedString(const nsACString & value,
+                                     nsACString & aHeaderLine)
+{
+  nsAutoCString quoted;
+  nsACString::const_iterator s, e;
+  value.BeginReading(s);
+  value.EndReading(e);
+
+  //
+  // Encode string according to RFC 2616 quoted-string production
+  //
+  quoted.Append('"');
+  for ( ; s != e; ++s) {
+    //
+    // CTL = <any US-ASCII control character (octets 0 - 31) and DEL (127)>
+    //
+    if (*s <= 31 || *s == 127) {
+      return NS_ERROR_FAILURE;
+    }
+
+    // Escape two syntactically significant characters
+    if (*s == '"' || *s == '\\') {
+      quoted.Append('\\');
+    }
+
+    quoted.Append(*s);
+  }
+  // FIXME: bug 41489
+  // We should RFC2047-encode non-Latin-1 values according to spec
+  quoted.Append('"');
+  aHeaderLine.Append(quoted);
+  return NS_OK;
+}
+
+} // namespace net
+} // namespace mozilla
+
+// vim: ts=2 sw=2