diff options
Diffstat (limited to 'netwerk/protocol/http/nsHttpDigestAuth.cpp')
| -rw-r--r-- | netwerk/protocol/http/nsHttpDigestAuth.cpp | 722 |
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 |