- mbed-tls - lists.trustedfirmware.org

Re: [mbed-tls] Upgrading from 2.13.1.to ??.??.??

by Manuel Pegourie-Gonnard

Hi Jeff, > Given the age of the version of mbedTLS I’m using, which is 2.13.1, plus the recent security alert, I think I need to upgrade the version of mbedTLS we have. The question is, which version to use? Indeed upgrading to a maintained branch is very recommended! There are currently two actively maintained branches you could use: * 2.16.x, which is our latest LTS branch, currently at 2.16.7. As an LTS branch, it only receives bug fixes and security updates, so it's pretty stable. In particular, since it doesn't receive any new feature, its footprint (code size) should remain mostly stable as well. * 2.x.y, released from the development branch, currently at 2.23.0. This is the branch where new features land. Both of these have full API compatibility with 2.13.1. We take great care not to break API compatibility between major releases - we haven't broken it since Mbed TLS 2.0.0 (release 2015-07-13), and the next release to break API compatibility with be 3.0.0 (now planned for early 2021). Until then, upgrading should be a simple matter of replacing the mbedtls directory in your source tree with the version of your choice, then rebuilding your project. (Moreover in the LTS branches we actually try maintain ABI compatibility as far as possible - that is, unless there's a security issue that can only be fixed by changing the ABI.) Mbed TLS is designed bo be quite modular an integrate with the OS and networking stack via user-provided hooks and compile-time configuration (`include/mbedtls/config.h`). I'm not sure how the integration with LwIP and FreeRTOS was done by your MCU vendor, but I suggest you check: * is the mbedtls directory in your source tree identical to our upstream release? If yes, you should be able to just replace it with the release of your choice and things should work. * otherwise, what's the nature of the differences: are filed shuffled to a different directory structure? is the build system different? has the `mbedtls/config.h` file been modified? have other files been modified (which ideally really shouldn't be necessary)? In that case, you'll probably need to apply the same changes to the upgraded version of Mbed TLS. Hopefully the differences if any will be small, and otherwise perhaps you MCU vendor can provide documentation about it. So I can't really say for this specific integration, but in principle upgrading Mbed TLS should be really painless - precisely so that people can upgrade easily in case of security fixes. Hope this helps, and let us know how it went! Regards, Manuel. ________________________________ From: mbed-tls <mbed-tls-bounces(a)lists.trustedfirmware.org> on behalf of Thompson, Jeff via mbed-tls <mbed-tls(a)lists.trustedfirmware.org> Sent: 14 July 2020 22:11 To: mbed-tls(a)lists.trustedfirmware.org <mbed-tls(a)lists.trustedfirmware.org> Subject: [mbed-tls] Upgrading from 2.13.1.to ??.??.?? Given the age of the version of mbedTLS I’m using, which is 2.13.1, plus the recent security alert, I think I need to upgrade the version of mbedTLS we have. The question is, which version to use? Because we got mbedTLS as example code from the MCU vendor, it was already integrated with lwIP and FreeRTOS. I’m sure this will not be a trivial effort, but I do need to present my management with some idea of the time it could take. Does anyone have a rough estimate of what to expect? I’m thinking on the order of 2 to 4 weeks for someone who is an experienced C programmer, but unfamiliar with either mbedTLS or lwIP. Or is that a pipe dream, with the actual time being closer to 3 or 4 months? Jeff Thompson | Senior Electrical Engineer-Firmware +1 704 752 6513 x1394 www.invue.com [cid:image001.gif@01D659E2.BE6C0700]

6 years

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Upgrading from 2.13.1.to ??.??.??

by Thompson, Jeff

Given the age of the version of mbedTLS I'm using, which is 2.13.1, plus the recent security alert, I think I need to upgrade the version of mbedTLS we have. The question is, which version to use? Because we got mbedTLS as example code from the MCU vendor, it was already integrated with lwIP and FreeRTOS. I'm sure this will not be a trivial effort, but I do need to present my management with some idea of the time it could take. Does anyone have a rough estimate of what to expect? I'm thinking on the order of 2 to 4 weeks for someone who is an experienced C programmer, but unfamiliar with either mbedTLS or lwIP. Or is that a pipe dream, with the actual time being closer to 3 or 4 months? Jeff Thompson | Senior Electrical Engineer-Firmware +1 704 752 6513 x1394 www.invue.com [cid:image001.gif@01D659E2.BE6C0700]

6 years

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Re: [mbed-tls] mbed-tls canonical repository (trustedfirmware.org git empty)

by Shebu Varghese Kuriakose

Hi Matt. You are right - https://git.trustedfirmware.org/tls/mbed-tls.git seem to be empty. As part of Mbed TLS transitioning to trustedfirmware.org community project in March’20, a mirror of https://github.com/ARMmbed/mbedtls.git was created in the above trustedfirmware.org git. Yes, all the development is still carrying on in https://github.com/ARMmbed/mbedtls.git and the plan is to move the development of MbedTLS to trustedfirmware.org repository itself a bit later on. The trustedfirmware.org Mbed TLS mirror repository seem to have moved to https://git.trustedfirmware.org/mirror/mbed-tls.git/. Regards, Shebu From: mbed-tls <mbed-tls-bounces(a)lists.trustedfirmware.org> On Behalf Of Matt Walker via mbed-tls Sent: Wednesday, July 8, 2020 8:34 PM To: mbed-tls(a)lists.trustedfirmware.org Subject: [mbed-tls] mbed-tls canonical repository (trustedfirmware.org git empty) Hi; For a while I've had a couple of projects pulling in mbed-tls from the trustedfirmware.org<http://trustedfirmware.org> git repository at https://git.trustedfirmware.org/tls/mbed-tls.git However, I just attempted to clone from that repository again only to discover it's now empty! I've searched around and I can't find any messaging on why this would be the case, so it's either an accident or my search foo is failing me. It looks like the majority of development for mbed-tls is still happening on github at https://github.com/ARMmbed/mbedtls.git but I'd rather point my upstream to the canonical location. Is this a temporary outage, or should github be considered the origin of all things mbed-tls? Thanks, Matt Walker

6 years

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Mbed TLS: Security Advisory and Release of Mbed TLS 2.23.0, 2.16.7 and 2.7.16

by Janos Follath

An Mbed TLS Security Advisory has been issued to accompany the release of Mbed TLS versions 2.23.0, 2.16.7 and 2.7.16, which have just been released. These releases of Mbed TLS address several security issues, provide bug fixes, and bring other minor changes. Full details are available in the release notes Mbed TLS 2.23.0<https://github.com/ARMmbed/mbedtls/releases/tag/mbedtls-2.23.0>, Mbed TLS 2.16.7<https://github.com/ARMmbed/mbedtls/releases/tag/mbedtls-2.16.7>, Mbed TLS 2.7.16<https://github.com/ARMmbed/mbedtls/releases/tag/mbedtls-2.7.16> and in the 2020-07 security advisory<https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advi…>. We recommend all users to consider whether they are impacted, and to upgrade appropriately.

6 years

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mbed-tls canonical repository (trustedfirmware.org git empty)

by Matt Walker

Hi; For a while I've had a couple of projects pulling in mbed-tls from the trustedfirmware.org git repository at https://git.trustedfirmware.org/tls/mbed-tls.git However, I just attempted to clone from that repository again only to discover it's now empty! I've searched around and I can't find any messaging on why this would be the case, so it's either an accident or my search foo is failing me. It looks like the majority of development for mbed-tls is still happening on github at https://github.com/ARMmbed/mbedtls.git but I'd rather point my upstream to the canonical location. Is this a temporary outage, or should github be considered the origin of all things mbed-tls? Thanks, Matt Walker

6 years

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Re: [mbed-tls] Mutual Authentication in TLS handshake - No client certificate passed

by Hannes Tschofenig

Hi all, I have been using Mbed TLS with mutual certificate-based authentication all the time. Here is the configuration: [cid:image004.jpg@01D65150.65DFD610] Here is a link to a webinar where I talk about certificate-based authentication and show-case mutual authentication with a Keil development board: https://www.youtube.com/watch?v=iH4v-aXQ2zQ<https://www.youtube.com/watch?v=iH4v-aXQ2zQ&feature=emb_logo> Slides are here: http://www2.keil.com/docs/default-source/default-document-library/keil_mbed… >From what I can tell (trying to connect to your test server myself) you haven't configured the auth_mode=required on the server side. Without it the TLS server will not send a CertificateRequest message. Ciao Hannes From: mbed-tls <mbed-tls-bounces(a)lists.trustedfirmware.org> On Behalf Of Abhilash Iyer via mbed-tls Sent: Friday, July 3, 2020 2:56 PM To: Subramanian Gopi Krishnan <gopikrishnan.subramanian(a)kone.com> Cc: mbed-tls(a)lists.trustedfirmware.org Subject: Re: [mbed-tls] Mutual Authentication in TLS handshake - No client certificate passed Hi Gopi, Thank you very much for your feedback. I double checked all the recommended configuration that you mentioned but it did not help. I really suspect if I have hit a mbedTLS limitation here. Following our conversation, I tried connecting to the server using openSSL. Server: https://preview.auth.edgeai.azure.net/api/v1/device/auth<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpreview.a…> OpenSSL commands: OpenSSL> s_client -connect preview.auth.edgeai.azure.net:443 -showcerts -debug -msg -state -tls1_2 -cert certificate1.pem -key privateKey1.pem GET /api/v1/device/auth HTTP/1.1 HOST:preview.auth.edgeai.azure.net With the above commands, I am able to send the client certificate to the server. I have attached the openSSL logs to show the flow of TLS activity. As per the logs attached, this is the flow of activity: 1. In the first TLS handshake there is no certificate request and no client certificate sent. I see ClientHello, ServerHello, ServerCertificate, ServerKeyExchange, Server Done, ClientKeyExchange, Change cipher spec, Certificate chain information and Server Cert. Till here, I do see: No client certificate CA names sent. 2. Now when I do a Get call & pass the HOST, client writes that call to the server and in turn the server returns me a "HelloRequest" which is encrypted. Now, this chain of handshake has a CertificateRequest, ClientCertificate, CertificateVerify etc. I see that 1009 bytes of data been written on the server under the name of client certificate. There is no way to see this certificate because the channel is encrypted now. 3. Lastly, we get HTTP/1.1 200 OK. Now when I do the same thing using the mbedTLS client on windows 10 PC, I see that the client gets reset during the renegotiation process. Note that the client cert was supposed to be exchanged in the renegotiation period, not the initial handshake. I have attached the logs for mbedTLS client as well and here are the commands that I use to communicate using mbedTLS client. ssl_client2.exe server_name=preview.auth.edgeai.azure.net server_port=443 debug_level=5 auth_mode=required renegotiate=1 reconnect=1 request_page=/api/v1/device/auth crt_file=certificate1.pem key_file=privateKey1.pem ca_file=server_prev1.pem I am wondering if this type of exchange of certs is not supported by mbedTLS at all. But it doesn't work with the remote server since this server looks for the client cert in the renegotiation phase to retain client certificate privacy. Can you confirm that this is a MBEDTLS limitation and have to move to a different library? Thanks, Abhilash From: Subramanian Gopi Krishnan <gopikrishnan.subramanian(a)kone.com<mailto:gopikrishnan.subramanian@kone.com>> Sent: Sunday, June 28, 2020 8:58 PM To: Abhilash Iyer <Abhilash.Iyer(a)microsoft.com<mailto:Abhilash.Iyer@microsoft.com>> Subject: [EXTERNAL] RE: [mbed-tls] Mutual Authentication in TLS handshake - No client certificate passed Hi Abilash, Few things to verify 1. On server side - make sure the authentication mode is set to required instead of optional. * Test with browser, does Handshake is succeeding if cancelling to select Certificate. * If the above were success, then proceed to modify auth_mode on server as below and test once again. * mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_REQUIRED ); - insisting Server to Request Certificate. 2. On client side - check does it has a valid Certificate & Key set to TLS Configuration * mbedtls_ssl_conf_own_cert( &conf, &clicert, &pkey ); Thanks, Gopi Krishnan From: mbed-tls <mbed-tls-bounces(a)lists.trustedfirmware.org<mailto:mbed-tls-bounces@lists.trustedfirmware.org>> On Behalf Of Abhilash Iyer via mbed-tls Sent: Monday, June 22, 2020 2:00 PM To: mbed-tls(a)lists.trustedfirmware.org<mailto:mbed-tls@lists.trustedfirmware.org> Subject: [mbed-tls] Mutual Authentication in TLS handshake - No client certificate passed This message is from an external sender. Be cautious, especially with links and attachments. Hello, I am trying to incorporate Mutual Authentication TLS in my hardware. For testing the mutual authentication in TLS, I setup a demo service which would request a client certificate in the TLS handshake. I used MS Edge, Google Chrome to test whether the service requests a client certificate during the TLS 1.2 handshake. When I ping the website, I do receive a request for a client certificate as shown in the image below. On selecting a certificate, I am able to access the website. Link to the demo service: https://serviceforsomsecurity.azurewebsites.net/<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fservicefo…> [A screenshot of a cell phone Description automatically generated] The above validates that the service requires the client to provide the client certificate during the TLS handshake. Now, when I test this with the sample mbedTLS ssl_client2.c program: https://github.com/ARMmbed/mbedtls/blob/development/programs/ssl/ssl_client…<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.co…>, the client does not send a certificate at all. The following are the steps that I carry out to test the TLS connection with my service with the sample mbedTLS ssl_client2.exe : 1. Open the mbedTLS.sln and build the ssl_client2 project. This creates a ssl_client2.exe under the Debug folder. 2. ssl_client2.exe server_name=serviceforsomsecurity.azurewebsites.net server_port=443 debug_level=3 auth_mode=required reconnect=1 crt_file=cert.pem key_file=key.pem ca_file=Digicert.cer force_version=tls1_2 The above command to test whether the client sends the client certificate during handshake. Here's the log: [A screenshot of a computer Description automatically generated] As you can see, in 3025 client receives: got no certificate request and then followed by server hello done at 3157. And then at 2080 & 2094, client skips writing certificate; during this handshake. 3. Then I tried including renegotiation flag: ssl_client2.exe server_name=serviceforsomsecurity.azurewebsites.net server_port=443 debug_level=3 auth_mode=required reconnect=1 crt_file=cert.pem key_file=key.pem ca_file=Digicert.cer force_version=tls1_2 renegotiate=1 Even in this case, the client does not get the certificate and abruptly ends during renegotiation due to timeout. I have included both the log files below for complete handshake review. [ssl_client_without_renegotiation.txt and ssl_client_with_renegotiation.txt] Can you please let me know how to debug this client certificate problem? It will be really a great help! Million thanks in advance. Regards, Abhilash

6 years

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Re: [mbed-tls] Mutual Authentication in TLS handshake - No client certificate passed

by Abhilash Iyer

Hi Gopi, Thank you very much for your feedback. I double checked all the recommended configuration that you mentioned but it did not help. I really suspect if I have hit a mbedTLS limitation here. Following our conversation, I tried connecting to the server using openSSL. Server: https://preview.auth.edgeai.azure.net/api/v1/device/auth<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpreview.a…> OpenSSL commands: OpenSSL> s_client -connect preview.auth.edgeai.azure.net:443 -showcerts -debug -msg -state -tls1_2 -cert certificate1.pem -key privateKey1.pem GET /api/v1/device/auth HTTP/1.1 HOST:preview.auth.edgeai.azure.net With the above commands, I am able to send the client certificate to the server. I have attached the openSSL logs to show the flow of TLS activity. As per the logs attached, this is the flow of activity: 1. In the first TLS handshake there is no certificate request and no client certificate sent. I see ClientHello, ServerHello, ServerCertificate, ServerKeyExchange, Server Done, ClientKeyExchange, Change cipher spec, Certificate chain information and Server Cert. Till here, I do see: No client certificate CA names sent. 2. Now when I do a Get call & pass the HOST, client writes that call to the server and in turn the server returns me a "HelloRequest" which is encrypted. Now, this chain of handshake has a CertificateRequest, ClientCertificate, CertificateVerify etc. I see that 1009 bytes of data been written on the server under the name of client certificate. There is no way to see this certificate because the channel is encrypted now. 3. Lastly, we get HTTP/1.1 200 OK. Now when I do the same thing using the mbedTLS client on windows 10 PC, I see that the client gets reset during the renegotiation process. Note that the client cert was supposed to be exchanged in the renegotiation period, not the initial handshake. I have attached the logs for mbedTLS client as well and here are the commands that I use to communicate using mbedTLS client. ssl_client2.exe server_name=preview.auth.edgeai.azure.net server_port=443 debug_level=5 auth_mode=required renegotiate=1 reconnect=1 request_page=/api/v1/device/auth crt_file=certificate1.pem key_file=privateKey1.pem ca_file=server_prev1.pem I am wondering if this type of exchange of certs is not supported by mbedTLS at all. But it doesn't work with the remote server since this server looks for the client cert in the renegotiation phase to retain client certificate privacy. Can you confirm that this is a MBEDTLS limitation and have to move to a different library? Thanks, Abhilash From: Subramanian Gopi Krishnan <gopikrishnan.subramanian(a)kone.com> Sent: Sunday, June 28, 2020 8:58 PM To: Abhilash Iyer <Abhilash.Iyer(a)microsoft.com> Subject: [EXTERNAL] RE: [mbed-tls] Mutual Authentication in TLS handshake - No client certificate passed Hi Abilash, Few things to verify 1. On server side - make sure the authentication mode is set to required instead of optional. * Test with browser, does Handshake is succeeding if cancelling to select Certificate. * If the above were success, then proceed to modify auth_mode on server as below and test once again. * mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_REQUIRED ); - insisting Server to Request Certificate. 2. On client side - check does it has a valid Certificate & Key set to TLS Configuration * mbedtls_ssl_conf_own_cert( &conf, &clicert, &pkey ); Thanks, Gopi Krishnan From: mbed-tls <mbed-tls-bounces(a)lists.trustedfirmware.org<mailto:mbed-tls-bounces@lists.trustedfirmware.org>> On Behalf Of Abhilash Iyer via mbed-tls Sent: Monday, June 22, 2020 2:00 PM To: mbed-tls(a)lists.trustedfirmware.org<mailto:mbed-tls@lists.trustedfirmware.org> Subject: [mbed-tls] Mutual Authentication in TLS handshake - No client certificate passed This message is from an external sender. Be cautious, especially with links and attachments. Hello, I am trying to incorporate Mutual Authentication TLS in my hardware. For testing the mutual authentication in TLS, I setup a demo service which would request a client certificate in the TLS handshake. I used MS Edge, Google Chrome to test whether the service requests a client certificate during the TLS 1.2 handshake. When I ping the website, I do receive a request for a client certificate as shown in the image below. On selecting a certificate, I am able to access the website. Link to the demo service: https://serviceforsomsecurity.azurewebsites.net/<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fservicefo…> [A screenshot of a cell phone Description automatically generated] The above validates that the service requires the client to provide the client certificate during the TLS handshake. Now, when I test this with the sample mbedTLS ssl_client2.c program: https://github.com/ARMmbed/mbedtls/blob/development/programs/ssl/ssl_client…<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.co…>, the client does not send a certificate at all. The following are the steps that I carry out to test the TLS connection with my service with the sample mbedTLS ssl_client2.exe : 1. Open the mbedTLS.sln and build the ssl_client2 project. This creates a ssl_client2.exe under the Debug folder. 2. ssl_client2.exe server_name=serviceforsomsecurity.azurewebsites.net server_port=443 debug_level=3 auth_mode=required reconnect=1 crt_file=cert.pem key_file=key.pem ca_file=Digicert.cer force_version=tls1_2 The above command to test whether the client sends the client certificate during handshake. Here's the log: [A screenshot of a computer Description automatically generated] As you can see, in 3025 client receives: got no certificate request and then followed by server hello done at 3157. And then at 2080 & 2094, client skips writing certificate; during this handshake. 3. Then I tried including renegotiation flag: ssl_client2.exe server_name=serviceforsomsecurity.azurewebsites.net server_port=443 debug_level=3 auth_mode=required reconnect=1 crt_file=cert.pem key_file=key.pem ca_file=Digicert.cer force_version=tls1_2 renegotiate=1 Even in this case, the client does not get the certificate and abruptly ends during renegotiation due to timeout. I have included both the log files below for complete handshake review. [ssl_client_without_renegotiation.txt and ssl_client_with_renegotiation.txt] Can you please let me know how to debug this client certificate problem? It will be really a great help! Million thanks in advance. Regards, Abhilash

6 years

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[Mbed-tls-announce] Mbed TLS: Security Advisory and Release of Mbed TLS 2.23.0, 2.16.7 and 2.7.16

by Janos Follath via Mbed-tls-announce

An Mbed TLS Security Advisory has been issued to accompany the release of Mbed TLS versions 2.23.0, 2.16.7 and 2.7.16, which have just been released. These releases of Mbed TLS address several security issues, provide bug fixes, and bring other minor changes. Full details are available in the release notes Mbed TLS 2.23.0<https://github.com/ARMmbed/mbedtls/releases/tag/mbedtls-2.23.0>, Mbed TLS 2.16.7<https://github.com/ARMmbed/mbedtls/releases/tag/mbedtls-2.16.7>, Mbed TLS 2.7.16<https://github.com/ARMmbed/mbedtls/releases/tag/mbedtls-2.7.16> and in the 2020-07 security advisory<https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advi…>. We recommend all users to consider whether they are impacted, and to upgrade appropriately. -- Mbed-tls-announce mailing list Mbed-tls-announce(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/mbed-tls-announce

6 years

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[Mbed-tls-announce] Welcome to Mbed TLS Announce @ TrustedFirmware.org

by Janos Follath via Mbed-tls-announce

Welcome to the Mbed TLS Announcement list @ TrustedFirmware.org! This mailing list is the primary channel for announcements about upcoming Mbed TLS releases and security advisories. This mailing list includes all members of the higher traffic developer mailing list<https://lists.trustedfirmware.org/mailman/listinfo/mbed-tls>. Therefore all announcements will also appear on the developer mailing list and there is no need to subscribe to both. Thanks and regards Janos (on behalf of the Mbed TLS maintainer team) IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. -- Mbed-tls-announce mailing list Mbed-tls-announce(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/mbed-tls-announce

6 years

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New TrustedFirmware.org security incident process is now live

by Dan Handley

Hi all The new TrustedFirmware.org security incident process is now live. This process is described here: https://developer.trustedfirmware.org/w/collaboration/security_center/repor… Initially the process will be used for the following projects: TF-A, TF-M, OP-TEE and Mbed TLS. The security documentation for each project will be updated soon to reflect this change. If you are part of an organization that believes it should receive security vulnerability information before it is made public then please ask your relevant colleagues to register as Trusted Stakeholders as described here: https://developer.trustedfirmware.org/w/collaboration/security_center/trust… Note we prefer individuals in each organization to coordinate their registration requests with each other and to provide us with an email alias managed by your organization instead of us managing a long list of individual addresses. Best regards Dan. (on behalf of the TrustedFirmware.org security team)

6 years

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