Decrypt Mac Verify Failed For Connection

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• Decrypt Mac Verify Failed For Connection Password
• Decrypt Mac Verify Failed For Connection Windows 7
• Cisco Decrypt Mac Verify Failed For Connection

This guide tries to help with debugging of SSL/TLS problems and shows the most common problems in interaction between clientand server. It is not intended to help with writing applications and thus does not care about specific API's etc. But itshould help with problems outside of a specific API, like different or broken SSL stacks or misconfigurations.

The guide is based on the knowledge gained as the maintainer of theIO::Socket::SSL Perl module or by debugging SSL problems at work orfor fun.

The handshake is successful but after some packets are successfully decrypted, we get -29056 (0x7180) i.e. Verification of the message MAC failed. Let the remote peer verify the MAC, we just want to disable the MAC check at our end i.e. On each new incoming connection, I was creating a new client socket and context, loading ca-bundle as verify file, then creating a new server context, getting the spoofed certificate. It was functioning, but I started developing issues where ECKEY objects were being double freed and such. Ensure that openssl versions (used to encrypt/decrypt), are compatible. The hash used in openssl changed at version 1.1.0 from MD5 to SHA256. This produces a different key from the same password. Fix: add '-md md5' in 1.1.0 to decrypt data from lower versions, and add '-md sha256 in lower versions to decrypt data from 1.1.0. The process of establishing a secure SSL/TLS connection involves several steps. SSL/TLS security protocols use a combination of asymmetric and symmetric encryption. The client and the server must negotiate the algorithms used and exchange key information.

Unfortunatly SSL/TLS is a hard to debug protocol because:

• Error messages are missing, are not very specific or even hide the real problem.
• There are lots of broken configurations and SSL stacks in the wild. And while browsers try to work around it asmuch as possible the stacks in applications or scripts are mostly not that tolerant.
• There are lots of bad tips out there which often only work around the underlying problem by seriously degradingthe security of the protocol.
• Deeper knowledge of the protocol and standards is necessary to understand and fix most problems instead of applyingsome insecure workaround found somewhere on the internet.

Useful/required knowledge

While SSL/TLS is a complex protocol there a some basics one should understand in order to debug and fix most problems:

• SSL/TLS provides encryption and identification.
• Encryption without proper identification (or a pre-shared secret) is insecure, becauseMan-in-the-middle attacks (MITM) are possible.
• Identification is mostly done with certificates:
  • Builtin trust anchors (Root-CA) in the application (e.g. browser, mobile app, ..).
  • The server provides its own certificate and the intermediate certificates (trust chain) leading to the trustanchor. A similar mechanism can be used to authenticate the client too (client certificates).
  • The servers certificate must match the expected identity, i.e. usually the hostname.For HTTPS see RFC 2818 andCA Browser Forum Baseline Requirementsfor details, for other protocols see RFC 6125.
• Certificate/public key pinningcan be used as an alternative to local trust anchors
  • In this case the application knows up-front the fingerprint of the certificate or embedded public key.
  • This fingerprint is hard-coded into the application.
  • A lesser secure alternative saves the fingerprint on the first connect to the peer. Of course this can notdetect if an MITM attack is already done on the first connect and then trust the attacker for futureconnections.
• There are different versions of the protocol (SSL 3.0, TLS 1.0..TLS 1.2), each fixing design flaws in the previousversion or adding features.
  • TLS 1.0 is in reality SSL 3.1, but the name of protocol has been changed.
  • TLS extensions like Server Name Indication (SNI) canonly be done with TLS1.x.
  • SSL 3.0 is considered broken (POODLE) and should no longer be used.
• Cipher suites decide about methods for authentication, encryption ..
  • Cipher suites are mostly independend of the protocol version. The version only specifies when this cipher wasintroduced:
    • There are no TLS1.0 or TLS1.1 cipher suites, but TLS1.2 added some.
    • SSL3.0 ciphers are still used in TLS1.x
  • Ciphers vary in their strength and there are weak ciphers which should no longer be used. There are lots ofresources about the optimal ciphers, one of them is Mozilla.
• Before the encryption starts the peers agree to the protocol version and cipher used within the connection,exchange certificates used for authentication and exchange the keys for encryption. Almost all of the problemsoccure within this initial handshake.

Common misunderstandings about SSL/TLS

• I only want encryption and don't like all this certificate stuff:
  • Any encryption without identifcation (or a shared secret) is open to MITM attacks.
• A self-signed certificate is secure enough:
  • True, but only if the certificate is trusted up-front in the application, like withcertificate/public key pinning.
• I want TLS, but not SSL:
  • TLS1.0 is SSL3.1, that is they changed the name of the protocol.
  • In the context of SMTP, IMAP or FTP, 'SSL' is often used to describe SSL/TLS from start, while 'TLS' is used todescribe upgrade to SSL/TLS after some kind of STARTTLS command. It is better to use 'implicit' and 'explicit'SSL/TLS here.
• Disabling SSL3.0 (because of POODLE) can be done by disabling all SSL3.0 ciphers:
  • Not really, because these ciphers are needed for TLS1.x too. You should disable the SSL3.0 protocol instead.

Security relevant errors which don't cause obvious problems

These kind of problems are not obvious, because everything seems to work fine.But they open ways for attacks and thus need to be fixed.Unfortunatly, often these kind of problems are caused by an attempt to fix another problem and by not understanding thesecurity implications of the applied workaround.

• Use of insecure protocols or features:
  • SSL2.0, SSL3.0 are broken and should not be used.
  • Other attacks are possible by using insecure renegotiation, compression .. . For details seeWikipedia
• Use of insecure implementations:
  • In 2014 all major TLS stacks where affected by serious implementation problems: OpenSSL Heartbleed,Apple Secure Transport goto fail,Microsoft SChannelWinshock, and certificate verification problems with GnuTLS
• Insecure certificate checks:
  • Due to insecure defaults in lots of programming languages (Python, Ruby, PHP, Perl..) or libraries,certificates are either not verfified at all or only the trust chain is verified but not the hostname againstthe certificate. This gets only slowly fixed because the developers fear to break existing code.
  • Because proper certificate checking is often in the way of testing, lots of iOS- and Android developersexplicitly disable these checks and fail to enable checks in production version.
  • Lots of applications don't have proper hostname checks, i.e. accept wildcards anywhere or multiple wildcards oreven check the subject against a regex. Sometimes these checks are too broad, but in some cases they are toonarrow (missing check of subject alterative names) so users disable checks completely.
• Use of insecure ciphers
  • Some application just accept 'ALL', which includes very weak cphers (EXPORT, LOW) and also anonymous ciphersuites (with no authentication) which make MITM easy.
  • Others allow or even require broken ciphers like DES-CBC-SHA or RC4-SHA.

Useful tools for debugging

Often an error message alone is not sufficient to solve the problem. In this case the following tools can be of help:

• SSLLabs can be used to check problems with publicaccessible HTTPS servers. It shows problems about certificate verification and also about potential problems withspecific TLS clients.
• In case it is not https or the server is not public accessible analyze.pl from my SSL tools can help. It can be used to debug TLS problems with plain TLS or explicit TLS onSMTP, IMAP, POP3 and FTPS and with HTTP proxies.
• openssl helps with debugging too, especially with the s_client, s_server and x509 commands.
• And wireshark can be used to analyse packet captures done by tcpdump or wireshark. It is able to show lots ofdetails about the TLS handshake.

The usual steps in debugging

• Collect error messages and compare them with the solutions/descriptions below.
• Do any of the proposed tools show information which might explain the problem?
• Narrow down the problem to the client or the server or something in between, i.e.
  • Try to access the same server from different clients (browsers, apps, ..).
  • Try to access the same server from different networks. If possible access server from the servers machine or atleast from the servers local network.
  • Try to access different servers from the same client.
• Check for known problems with the SSL stack used by the affected application.
• If the affected part is one's own application: try to strip it down as much as possible and remove anycustomization which might cause the problems.
• If other peers work: look at their traffic and try to restrict protocol version, ciphers to emulate theirtraffic.

If still not resolved: provide anybody willing to help with the collected information and also with debug informationand a packet capture in a form usable by wireshark. Also provide information about the used SSL stacks (i.e. browser orapplication version, programming language version, OS version).

WARNING: while you might disable verification or downgrade ciphers or protocol to insecure versions to track down theproblem do not simply leave it this way once you've 'fixed' the problem this way. Instead track down the cause of theproblem and fix it, especially:

• Fix certificates if verification failed due to bad or self-signed certificate.
• If this is not possible use certificate/public key pinning to accept only this bad certificate.
• Don't restrict yourself to bad protocol versions or ciphers, even if these solve the problem at the moment. Therewill be a time when the peer will be upgraded and then you will have problems again. This happened a lot whenSSL 3.0 got disabled (POODLE attack) and lots of clients suddenly failed to connect, because they hadhard-coded use of SSL 3.0 in their application.

Decrypt Mac Verify Failed For Connection Password

How to check for common problems

• How to check if server requires SNI
  • Use 'openssl s_client' with and without '-servername' option. If the returned certificates differ then SNI isrequired. Some servers even fail completly when accessed without SNI.
  • SSLLabs will also tell you if the site requires SNI ('This site works only in browsers with SNIsupport').
  • Use analyze.pl, it will tell you if different certificates are returned with and without SNI.
• How to check for missing chain certificates
  • SSLLabs will tell you if the chain is incomplete ('Chain Issues') and will try to show the missingintermediate certificates.
  • analyze.pl --show-chain will show the chain too, but not the missing certificates.
• How to check for trusted Root-CA
  • SSLLabs will check if one of the common CA is used as the trust anchor.
  • analyze.pl will check against system CA (or Mozilla's CA on Windows and Mac OS X), but can alsocheck against a certificate store specified by the user.
  • 'openssl s_client' can check against a given CA. But it will in this case also check against OpenSSL defaultCA's too, so the result can be misleading.
• How to check using a client certificate
  • analyze.pl can be given a client certificate.
  • 'openssl s_client' can also use client certificate.
• How to check which ciphers and protocols are supported by the server.
  • SSLLabs will show the available ciphers and protocols and also emulate the behavior of specificclients to see if a connection should be successful or why not. Please check that theirtests use the same IP address as you do, notably SSLLabs currently does not support IPv6addresses.
  • analyze.pl --all-ciphers shows which ciphers of the locally installed OpenSSL are supported bythe peer. It will also show if the server chooses the cipher based on clients or servers preferences.It also shows protocol support.
• How do I perform the checks if explicit TLS is used (STARTTLS etc)
  • analyze.pl supports SMTP, IMAP, FTP, POP3, HTTP proxy and PostgreSQL with the '--starttls'option.
  • 'openssl s_client' supports SMTP, IMAP, FTP and POP3 with the '-starttls' option.

Common problems caused by SSL stacks at server, client or middlebox

• No SNI support for SSL 3.0, Android (depending on application), MSIE on XP, Java 6 and various otherprogramming languages. This will cause problems , when the server has multiple certificates on the same IP address(like Cloudflare Free SSL). It will usually result in certification errors because the wrong certificate isreceived. But in some cases the server will also just close the connection or issue an alert or similar, dependingon servers configuration and TLS stack.The fix is to upgrade to a version which supports SNI. Workaround at the server is to have a separate IP addressfor the affected certificates.
  • SNI is not supported by Internet Explorer 8 and older versions. If the system can not be upgraded an alternativebrowser like Firefox, which is not using SChannel, can be used.
  • The Apache HTTPClient library as used in Android does not support SNI. For workarounds seehere.
  • No SNI in Java 6 and lower, Python 2 (until 2.7.8) and older versions of other programming languages or packages.No workarounds for the client is known, that is an upgrade is required.
• F5 Big IP: TLS handshake times out, because of no response to ClientHello.Older versions of F5 Big IP simply absorb ClientHello witha size between 256 and 511 bytes. Because TLS 1.2 offers more ciphers this mostly happens with TLS 1.2 handshakes,but was also seen with TLS 1.1. Workaround is to reduce the number of ciphers offered by the client.Fix is to patch the device.Newer versions of OpenSSL contain a workaround SSL_OP_TLSEXT_PADDING which can break IronPort instead.
• phantomjs currently defaults to SSL 3.0, whichgets more and more disabled by the servers because it is insecure. Use `--ssl-protocol=any` touse more recent versions of TLS.
• Some servers are broken and don't support the most common SSLv23 handshake. But cURL (at least version 7.41 withOpenSSL backend) will try an SSLv23 handshake in all cases,except when use of SSL 3.0 is explicitly requested. Other clients instead can instead do a TLS1.0 only handshake.
• If `openssl s_client` is used with the `-CAfile` option it will not only check against the certificates given inthis file but additionally against the system defaults. Thus the result might be different between various systems([[http://stackoverflow.com/a/29115499/3081018][especially UNIX and Windows]]) because the defaults differ.

Common problems caused by misconfiguration

• Server allows only allow bad ciphers, like RC4-SHA. Some clients like curl 7.35.0 have disabled these ciphers bydefault (see workaround) and there are recommendations for others likeMicrosoft Windows.

Problems due to bad certificates

• Certificate contents does not match hostname. There are clear rules how the checks should be done, but someapplications are less strict and others implement the checks wrong:
  • IP addresses should be stored as type IP in Subject Alternative Names (SAN) section. Most browsers currently accept IP in commonName too, but Safari does not.But for MSIE IP addresses have to be specified as DNS type inside theSAN section.
  • Wildcards are only allowed in Subject Alternative Names section. Most browsers currently accept wildcard in commonName too, but not Safari.
  • If a SAN section contains entries of type DNS than commonName should not be checked.Most browsers currently check commonName too, but Safari does not.Other applications do not check commonName, even if SAN section only contains entries for IP addresses.

In these cases either the certificate need to be fixed or the application must import the certificate as trusted or usecertificate/public key pinning.

Less common errors are:

• Certificate expired or not yet valid.
• Insecure certificates with a too small RSA key length or MD5 signatures. Most software does not accept thesecertificates anymore.
• Some (or all?) browser require the extKeyUsage of serverAuth inside the certificate, while most script languagesignore any usage restrictions.

Problems caused by inconsistent handling of root certificates

• Python, Ruby, PHP, Perl.. can behave in different ways, depending on language version. Even packages insidethese languages might have their own rules:
  • They might integrate with the OpenSSL CA store. This works on UNIX, but on Windows this will mostly result inverification errors, because there is no OpenSSL CA store. To get usable Root-CAs check here.
  • They might come with their own CA store.
  • They might even try to integrate with the systems CA store on Windows.

More unusal but existing problems

• Mac OS X hacks into OpenSSL to verify against systems key store if nothing is found in OpenSSL key store. Thusverification might succeed if failure was expected.
• At least some versions of HP ILO2 cause a handshake failure with 'bad record mac' when used with TLS1.x.Workaround is to use only SSL3.0.
• Some SSL stacks claim to support more ciphers or elliptic curves than they actually have implemented. This might bedue to misconfiguration, incomplete disabling of specific features at compile time or bugs. Seethis andthat where you get 'elliptic curve routines: EC_GROUP_new_by_curve_name: unknown group' in the client. And inthiscase the server just closes the connection. Workaround is to disable the affected ciphers on the client side.
• The Perl package LWP::UserAgent changed with version 6.0 (03/2011) the TLS backend from Crypt::SSLeay toIO::Socket::SSL but the https proxy support was broken until version 6.06 (04/2014). Before that fix you usuallygot 'Bad request' or similar back from the proxy.
• Python 3 might send a zero-length server name extension (SNI), causingtlsv1 alert decode error.
• Cross-Signing of CA certificates can result in multiple possible trust chains, depending onwhich chain certificates the server is sending. Different SSL stacks behave differently when verifying thesechains, which can result in verification errors onWindows or with OpenSSL.

Problem solving by error message or symptom

Decrypt Mac Verify Failed For Connection Windows 7

• TCP connection failed or timed out:
  • This is no TLS problem at all. In this case no TCP connection is possible to the peer, because the peer might bedown, a firewall in between or similar.
  • Make sure that it is a really at the TCP level by using telnet or similar tools.
• certificate verify fail
  • Client with known verification problems?
  • Is SNI required by server, like withCloudflare free SSL? Does client support SNI?
  • Check for missing chain certificates. Desktop browsers might work with missing chain certificates since they cache these from previous sessions toother sites and also sometimes load them by URL given in related certificates. Firefox does not do this, but Chromeand MSIE might do it. Other applications usually don't do this.
  • Is the certificate valid at all?
  • Invalid local time might cause reports about expired or not yet valid certificates.
  • SSL interception inside a company will cause to be signed by a proxy CA. Verification will fail if this CA isnot trusted by the application.
  • Verification might even fail in case of SSL interception if the proxy CA is trusted, because the applicationuses certificate/public key pinning. While most browsers ignore the pinning if the certificate issigned by a CA which was explicitly added by the user, pinning using EMET on Windows might not make thisexception.
  • The needed Root-CA might be known on the system, but maybe not in the trust storeused by the specific application.
• no shared ciphers
  • Check support ciphers by client and server. Typical problems are
    • Misconfiguration because all SSL 3.0 ciphers got removed.
    • Server uses old ciphers which are no longer supported by client, or the other way.
    • No certificates are configured at the server, which then falls back to anonymous authentication. These ciphers arenot supported by most clients for security reasons (MITM).
• unknown protocol
  • This happens if the peer does not speak TLS at all, typically by attempting TLS against port 80 (non-TLS),by trying to access an SMTP server neeeding explicit TLS (STARTTLS) using implicit TLS or byaccessing a badly configured server which provides plain http instead of https on port 443.
  • This can also happen if server and client have no protocol versions in common.
• SSL handshake timed out, 'want read'
  • This can be some bad middlebox like here. Retry from another network, with different TLS versions or less ciphers.
  • Or it might be that the peer does not speak TLS at all and just waits for more data.
• 'connection closed' or 'connection reset by peer' or 'handshake failure'or 'error 40' or 'SSL_connect SYSCALL ..'Might be lot of different things, like
  • SChannel (Microsoft) peers often do not send a TLS alert back on errors, but simply close connection.In this case it would be helpful to check at the peer side for error messages.
  • Peer might have crashed and thus connection got closed.
  • The problem has been seen when client uses SNI but server has no configuration for the provided name(misconfiguration server or DNS).
  • The problem has been seen when client does not use SNI but server requires SNI (bad server, should send alert back).
  • It was seen when the client provided an unexpected certificate, or provided no certificate even if serverrequested one.
  • Or some other broken client.
  • Server requires SNI and will even fail with handshake if SNI is not used. Seehere for how to check for SNI.
• elliptic curve routines:EC_GROUP_new_by_curve_name:unknown group
  • If ECC is used (like with ECDHE ciphers) the client needs to announce the supported ECC curves. If it does notannounce any the server is free to pick any curve, which then might not be available on the client. Seehere for more information.
• bad record mac
  • This might be someone tampering with the traffic. But more likely it is some old and broken server like HP ILO2.
• fails because of OCSP problem
  • Unfortunatly OCSP responders sometimes return bad, expired or no responses, which makes reliance on OCSP a problem.Also, some web servers provide expired OCSP responses with OCSP stapling.
  • This usually happens only if one enforced strict OCSP checking, e.g. by setting 'security.OCSP.require' inFirefox.
  • Workaround: disable strict OCSP checking. But this degrades security.
• tlsv1 alert decode error
  • Client probably sends improper messages, like a zero-length server name extension.
• I got a mail about my application, referencing VU#582497
  • Your application has broken certificate validation. You probably did this because
    • you got certificate problems while testing
    • you saw some post online on how to 'fix' your problem by disabling verification
    • you just used the code you've found there without understanding the implications
  • Now you have to fix your code, by
    • just remove any custom validation you have done
    • if you get errors now use the correct certificates at the peer
    • alternativly use certificate/public key pinning

When it worked before, works with other applications, servers ..

• it worked before the browser got upgraded
  • Firefox removed some RSA 1024 Root-CA's recently, other browsers still have them. Some certificates mightaffected by this and should be replaced.
  • More and more browser disable SSL 3.0 by default.
• it worked before the local system got upgraded
  • Programming languages like Python, PHP, Ruby, Perl and probably others moved or in the process of moving toproper verification of TLS by default. Proper validation was also added to other tools.This will affect code which implicitly expected no verification. Fix yourcode to expect proper verification. Disable verification only if these are just test scripts which don't workwith sensitive data.
  • Curl disables RC4 ciphers by default with version 7.35.0. Sites which don't support better ciphers will nolonger work. Workaround: RC4 support is still there, buthas to be explicitly enabled.
  • Perl LWP::UserAgent moved from Crypt::SSLeay to IO::Socket::SSL as SSL back end and thus checks certificates muchmore rigourous. This might cause problems when no or lazy validation was expected. It might also give problemswhen proxy is in use. In this case an upgrade to 6.06 for both LWP::UserAgent and LWP::Protocol::https isneeded.
• it worked before the server configuration changed
  • The server might require SNI now, but client might not support SNI.
  • The server might no longer support the protocol or ciphers used by theclient. This affects especially clients on old platforms or clients with hard-coded protocol versions orciphers. Typical examples are disabling of SSL 3.0 because of POODLE or disabling RC4 ciphers. Also some serversdisabled all SSL 3.0 ciphers in a flawed attempt be save against POODLE.
  • The server might have changed the certificate and forgot to send the new chain certificates.
• it worked yesterday, last week..
  • Then probably some of the events described above happened.
  • Or the certificate of the server expired (or the local time is wrong and it looks only expired).
• it works in desktop browsers but not on Android/iOS/script/other application.
  • Then it is probably either an incomplete certificate chain.
  • Or the server requires SNI but your app does not support it.
  • Also, desktop browsers retry the connection with a lower protocol version on most errors, while other applicationmostly don't automatically downgrade.
• it works on the same computer at home
  • If the problem shows up as invalid certificate:
    • If you are in a company then SSL interception is probably done for security reason. In this case thecertificate is signed by your company or some firewall vendor and not by the original CA. You need to importthe relevant CA into your browser as trusted if you want to accept the interception.
    • Sometimes such interception is also done for the initial connection (to a landing page) at some WLAN hotspots.
  • If (TCP) connection fails: there is probably some firewall which blocks the connection. These might be for TCP connections on specific ports so that all traffic on this port fails, but itmight also be restricted to only selected target hosts.
• it works on other similar systems
  • Even if two systems have the same OS and upgrades they might behave differently:
    • Additional trusted Root-CAs might be installed on the system where the connection is successful.
    • The failing system might have disabled protocols like SSL 3.0 ordisabled ciphers like RC4, while the other system did not. These settings might by system wide or browserspecific.
• it works in other browsers
  • The browsers differ in Root-CA's, supported ciphers and protocols. Seehere for how to solve the problem by the error message or symptom.
  • The browsers might also have different network settings, i.e. which proxy gets used.
• It works on some systems but not on others, sometimes works on similar systems sometimes not
  • Check if all these systems and application access the same server IP. I've seen problemswhere the server had several IP's for the same hostname but with different configurations,like different between IPv4 and IPv6.
  • Some setups show erratic behavior, which might be cause be a load balancer withseveral systems behind, where some of the systems have a different configuration from therest.

It still does not work

Cisco Decrypt Mac Verify Failed For Connection

• Check for the symptoms and error messages at stackoverflow.
• If nothing helpful is found ask a new question there. But, don't forget to provide as much information as possible to get a useful response.