Hi,
I have an inhouse developed secure authentication program that uses certificate for authentication. I have used mbedtls library for the x.509 certificate verification purpose. In our custom PKI we have only three level of certificates, Root-CA -> Intermediate-CA -> Device-Cert.
The embedded device has very limited memory, so instead of sending whole certificate chain, the devices communicates intermediate_CA and device cert (in der format base64 encoded) in separate packet. Root-CA will be available on node as trusted-ca. Intermediate is verified against Root; then device cert is verified against intermediate.
The problem is, the poc developed on linux platform is working fine - but on embedded platform I encounter either 0x3b00(parsing failed) or 0x2700(with flag 8). Also the error code are inconsistent.
I verified the integrity of packet with certificate using crc16. So no chance of certificate getting corrupted. Also verified the certificate's base64 format integrity using crc16.
All certificates are sha256WithRSAEncryption; RSA Public-Key: (4096 bit)
Attached config.h on target platform for reference - could you help me if anything wrong with configuration.
While trying to trace, the flag was set from x509_crt.c from below code.
/* No parent? We're done here */
if( parent == NULL )
{
printf("NO_PARENT\r\n");
*flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
return( 0 );
}
Any clue would be helpful.
Thanks,
Gopi Krishnan
Hi, I'm having an issue with some code using Mbed TLS and I was pointed to this mailing list as the correct place to ask for support. Please let me know if I should ask somewhere else. I'm trying to connect to my local government's website via a Raspberry Pi Pico, using a TLS client based on lwIP and altcp_tls. It's based off of the example from the Raspberry Pi team here: https://github.com/raspberrypi/pico-examples/tree/master/pico_w/wifi/tls_cl… . My Mbed TLS config is the same as what they have there, aside from some extra defines I added for debugging. The issue I am facing is that while various hosts work fine (e.g. postman-echo.com for testing), when I attempt to connect to my local council's website I get a TLS handshake error. My client has TLS verification disabled for the moment, but I have tried with the correct root certificates as well. The error I receive is mbedtls_ssl_handshake failed: -30592 I cloned down the mbed_tls repo, and had a similar issue with ssl_client1 -- i.e. works on postman-echo, not for my government, with mbedtls_ssl_handshake returning the error. Notably however, the error code in that instance was -31488. Interestingly, ssl_client2 works flawlessly with both hosts. I wasn't quite sure what part of ssl_client2 would cause it to work with my government host, as it's several thousand lines long, but I'm sure the answer is in there somewhere. I've attached a trace taken with debug logging level 4 on my Pico which shows where the TLS handshake is failing. I'd really appreciate any guidance of areas to troubleshoot next. Thanks, Jay
Hello,
I am referencing the Mbed TLS (v3.5) implementation for key slots & how they interact with the PSA key management APIs. In the PSA documentation<https://arm-software.github.io/psa-api/crypto/1.1/overview/implementation.h…>, sections 6.3.3 and 6.3.4 describe that persistent keys (that are handled according to the Memory cleanup rule) would have to be loaded from NVM on each use of the key, unless PSA_KEY_USAGE_CACHE is set.
However, I'm not certain I see this followed in the Mbed TLS code. 'psa_export_key()' is the simplest example. This function retrieves and locks the key slot for the requested key ID using 'psa_get_and_lock_key_slot_with_policy()' - this function may retrieve the persistent key material from NVM if necessary (it seems to return sooner if it finds that persistent key in a slot already). The remainder of psa_export_key() copies the key material from the slot directly to the output buffer, but it never removes the key material from the slot.
My understanding was that the key material should be removed from the slot unless PSA_KEY_USAGE_CACHE was set. Can anyone clear this up for me? Does this just mean that the reference implementation does not follow the memory cleanup rule, or is the slot buffer cleared at some later point for the persistent key?
Thank you,
Kevin Zak
Hi All,
A gentle reminder that the US-Europe timezone-friendly MBed TLS Tech forum
is next Monday at 4:30 PM UK time. Invite details can be found on the
online calendar here <https://www.trustedfirmware.org/meetings/>.
If you have any topics, please let Dave Rodgman know. :)
Best regards,
Don Harbin
TrustedFirmware Community Manager
don.harbin(a)linaro.org
Dear Mbed TLS users,
We recently announced the release of Mbed TLS 3.6.0, starting the 3.6 long-term support branch. We intend for this to be the last 3.x feature release. Mbed TLS 3.6.x will as usual receive bug fixes (including security improvements), but no new features. This will allow the Mbed TLS team to focus on preparing the next major release, Mbed TLS 4.0, planned for 2025 (expect further updates when the timeline becomes more precise).
The main focus of Mbed TLS 4.0 is to complete the migration to PSA crypto APIs. This means that most mbedtls_xxx cryptography APIs will be removed. We expect mbedtls_x509 and mbedtls_ssl to change in relatively minor, but sometimes incompatible ways. Alongside this technical change, the crypto APIs will be published as a separate product, TF-PSA-Crypto<https://github.com/Mbed-TLS/TF-PSA-Crypto> (very early preview so far), while the X.509 and TLS libraries will continue to be called Mbed TLS.
The work on 4.0 will happen on the development branch in the mbedtls repository, so you can expect more instability than usual on that branch. The mbedtls-3.6<https://github.com/Mbed-TLS/mbedtls/tree/mbedtls-3.6> branch is available if you want the latest patches on Mbed TLS 3.6 LTS.
As usual, you can see our high-level plans in the roadmap<https://mbed-tls.readthedocs.io/en/latest/project/roadmap/>, and in more detail on GitHub<https://github.com/Mbed-TLS/mbedtls/issues>. Look for issues labeled api-break<https://github.com/Mbed-TLS/mbedtls/issues?q=is%3Aissue+is%3Aopen+label%3Aa…> (note that we haven't filed issues on all topics yet).
We will launch some consultations on the mbed-tls mailing list<https://lists.trustedfirmware.org/mailman3/lists/mbed-tls.lists.trustedfirm…> soon, to gather community input on some topics.
Many Thanks,
Nathan Sircombe
(On behalf of the Mbed TLS development team)
Hi Mbed TLS list,
I’d just like to introduce myself to the wider Mbed TLS community.
I’ve recently joined the Mbed TLS team as the Engineering Manager for the Arm team. Although I’m new to this project, I’m not new to Arm having worked here for a while on a number of closed and open source library projects.
I look forward to working with you, and meeting some of you on our regular community calls.
Cheers,
Nathan.
p.s. my GitHub usid is nSircombe (https://github.com/nSircombe)
hello：
Recently, I am transplanting mbedtls from a 32-bit system to a 64-bit system. The compilation operating system is ubuntu20.4. The screenshot below is the code I use mbedtls(version number: 2.24.0). In the API mbedtls_rsa_gen_key implementation, there is a line of code that is ""MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &ctx ->E, exponent ) );"", the program crashed at the memset in mbedtls_mpi_set during execution. This has not happened on 32-bit platforms before, so I would like to ask whether it has something to do with the platform used or whether I call the API. It’s a question about how to use it, thank you very much
Hi, I am trying to identify the API available by looking up exported symbols from the built shared libraries libmbedcrypto.so ,libmbedtls.so and libmbedx509.so. I noticed that many of the exported functions are not documented here https://mbed-tls.readthedocs.io/projects/api/en/development/ . My question really is, are those functions exported through the shared libraries intended to be so ? For example, function mbedtls_mpi_core_add does not seem to be part of the API but it is exported. Is this intentional ? It's not uncommon that functions would be exported but not part of the API, I just wanted to get some clarification if possible regarding the reasons for doing so in the case of MbedTLS. Thanks Ahmed
Hi,
I am sorry but I need to know test case scenarios to verify what is
supported in the recent MBedTLS stack - what should be tested.
Objective is that we cover MBedTLS code the maximum.
Since I am a new learner, I need to build the test cases from
scratch. So I thought to first find from stack what TLS ciphers suites
/ digest it supports, what are the different keysize, and protocols -
TLSvX (where x=1,2 or 3). Then build certificates related to the same
and verify the data as found. Are there other ways to find different
features in the current MBedTLs stack and verify each one of them?
Is this approach the right way - do we have known test case scenarios
to verify? Any other additional help will aid us out.
Thanks in advance.
Regards,
Prakash
