- mbed-tls - lists.trustedfirmware.org

by Gilles Peskine

The TLS protocol has many options. A TLS connection starts with a handshake whose role is mostly for the client and the server to agree on these options. The ciphersuite is one of these options. It determines which cryptographic primitives will be used for the various security properties (data confidentiality, data integrity, server authentication, etc.). A ciphersuite mismatch, or more generally a mismatch of some option of the protocol, or a certificate mismatch, would normally result in the dissatisfied party closing the connection. For a ciphersuite mismatch, the server should send an alert "handshake failure". For a certificate mismatch, there are several alerts ("bad certificate", "certificate expired", etc.). The first tool to turn to when debugging a TLS connection is Wireshark. Compare a failing connection with a successful connection with similar settings (preferably to the same server). Keep in mind that there can be many legitimate differences, so the first difference might not be the source of the problem. You can try connecting with programs/ssl/ssl_client2 from the mbedtls source tree with different sets of options. For some background on how a TLS connection should work, I suggest starting with Wikipedia, then https://security.stackexchange.com/questions/20803/how-does-ssl-tls-work and https://tls.ulfheim.net/ (The Illustrated TLS Connection — note that while it's a very good explanation, it's for a specific choice of ciphersuite and other options). -- Gilles Peskine Mbed TLS developer On 29/06/2020 03:02, Thompson, Jeff via mbed-tls wrote: > Another baby step in discovering what's happening. The last message > from the server tells the client to change ciphersuites. I don't even > know what a ciohersuite actually is—something like RSA, AES, or > DES?—never mind how to change mine, though I have seen the list; my, > what a lot of conditionals it has. > > So, am I still dealing with a certificate issue? Where do I go from here? > > Get Outlook for Android <https://aka.ms/ghei36> > > ------------------------------------------------------------------------ > *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:* Friday, June 26, 2020 12:52:27 PM > *To:* mbed-tls(a)lists.trustedfirmware.org > <mbed-tls(a)lists.trustedfirmware.org> > *Subject:* Re: [mbed-tls] Choosing a cipher > > > A little progress. I figured out where—ssl_encrypt_buf() in > ssl_tls.c—to output the name of the offending ciphersuite, which is > included in all 3 of the preconfigure Google Cloud SSL policies. > > > > So what’s going on here? Why should the mbedTLS client wait forever > for 5 bytes it will never get, stalling the connection, instead timing > out or otherwise detecting an error it could return? > > > > I’m totally at a loss for what to do with this, other than looking for > a commercially supported alternative, which I don’t think would be > received very well by my manager. > > > > *Jeff Thompson* | Senior Electrical Engineer-Firmware > +1 704 752 6513 x1394 > www.invue.com > > > > *From:* Thompson, Jeff > *Sent:* Friday, June 26, 2020 09:40 > *To:* mbed-tls(a)lists.trustedfirmware.org > *Subject:* Choosing a cipher > > > > The TLS handshake between my device and ghs.googlehosted.com gets > stalled when the server sends the device a Change Cipher Spec > message—the device waits forever, wanting 5 more bytes. From what I > Google’d, I need to change the cipher suite I’m using. How do I know > which cipher the server doesn’t like (so I can avoid that in future), > and which one I should be using—there are scores of these available in > the config file, though some of them clearly should not be used, as > they are commented that way.. > > > > *Jeff Thompson* | Senior Electrical Engineer-Firmware > +1 704 752 6513 x1394 > www.invue.com > > > >

6 years, 3 months

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Re: [mbed-tls] Choosing a cipher

by Janos Follath

Hi Jeff, There is a specification document for the TLS 1.2 handshake (RFC 5246: https://tools.ietf.org/html/rfc5246) that I think might help finding out what is going on. There is a graph depicting the handshake on page 37 which I think can be particularly useful. Regards, Janos From: mbed-tls <mbed-tls-bounces(a)lists.trustedfirmware.org> on behalf of "Thompson, Jeff via mbed-tls" <mbed-tls(a)lists.trustedfirmware.org> Reply to: "Thompson, Jeff" <JeffThompson(a)invue.com> Date: Monday, 29 June 2020 at 02:02 To: "mbed-tls(a)lists.trustedfirmware.org" <mbed-tls(a)lists.trustedfirmware.org> Subject: Re: [mbed-tls] Choosing a cipher Another baby step in discovering what's happening. The last message from the server tells the client to change ciphersuites. I don't even know what a ciohersuite actually is—something like RSA, AES, or DES?—never mind how to change mine, though I have seen the list; my, what a lot of conditionals it has. So, am I still dealing with a certificate issue? Where do I go from here? Get Outlook for Android<https://aka.ms/ghei36> ________________________________ 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: Friday, June 26, 2020 12:52:27 PM To: mbed-tls(a)lists.trustedfirmware.org <mbed-tls(a)lists.trustedfirmware.org> Subject: Re: [mbed-tls] Choosing a cipher A little progress. I figured out where—ssl_encrypt_buf() in ssl_tls.c—to output the name of the offending ciphersuite, which is included in all 3 of the preconfigure Google Cloud SSL policies. So what’s going on here? Why should the mbedTLS client wait forever for 5 bytes it will never get, stalling the connection, instead timing out or otherwise detecting an error it could return? I’m totally at a loss for what to do with this, other than looking for a commercially supported alternative, which I don’t think would be received very well by my manager. Jeff Thompson | Senior Electrical Engineer-Firmware +1 704 752 6513 x1394 www.invue.com [cid:image001.gif@01D64DFD.447A03C0] From: Thompson, Jeff Sent: Friday, June 26, 2020 09:40 To: mbed-tls(a)lists.trustedfirmware.org Subject: Choosing a cipher The TLS handshake between my device and ghs.googlehosted.com gets stalled when the server sends the device a Change Cipher Spec message—the device waits forever, wanting 5 more bytes. From what I Google’d, I need to change the cipher suite I’m using. How do I know which cipher the server doesn’t like (so I can avoid that in future), and which one I should be using—there are scores of these available in the config file, though some of them clearly should not be used, as they are commented that way.. Jeff Thompson | Senior Electrical Engineer-Firmware +1 704 752 6513 x1394 www.invue.com [cid:image001.gif@01D64DFD.447A03C0]

6 years, 3 months

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Re: [mbed-tls] Choosing a cipher

by Thompson, Jeff

Another baby step in discovering what's happening. The last message from the server tells the client to change ciphersuites. I don't even know what a ciohersuite actually is—something like RSA, AES, or DES?—never mind how to change mine, though I have seen the list; my, what a lot of conditionals it has. So, am I still dealing with a certificate issue? Where do I go from here? Get Outlook for Android<https://aka.ms/ghei36> ________________________________ 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: Friday, June 26, 2020 12:52:27 PM To: mbed-tls(a)lists.trustedfirmware.org <mbed-tls(a)lists.trustedfirmware.org> Subject: Re: [mbed-tls] Choosing a cipher A little progress. I figured out where—ssl_encrypt_buf() in ssl_tls.c—to output the name of the offending ciphersuite, which is included in all 3 of the preconfigure Google Cloud SSL policies. So what’s going on here? Why should the mbedTLS client wait forever for 5 bytes it will never get, stalling the connection, instead timing out or otherwise detecting an error it could return? I’m totally at a loss for what to do with this, other than looking for a commercially supported alternative, which I don’t think would be received very well by my manager. Jeff Thompson | Senior Electrical Engineer-Firmware +1 704 752 6513 x1394 www.invue.com [cid:image001.gif@01D64BB6.03781220] From: Thompson, Jeff Sent: Friday, June 26, 2020 09:40 To: mbed-tls(a)lists.trustedfirmware.org Subject: Choosing a cipher The TLS handshake between my device and ghs.googlehosted.com gets stalled when the server sends the device a Change Cipher Spec message—the device waits forever, wanting 5 more bytes. From what I Google’d, I need to change the cipher suite I’m using. How do I know which cipher the server doesn’t like (so I can avoid that in future), and which one I should be using—there are scores of these available in the config file, though some of them clearly should not be used, as they are commented that way.. Jeff Thompson | Senior Electrical Engineer-Firmware +1 704 752 6513 x1394 www.invue.com [cid:image001.gif@01D64BB6.03781220]

6 years, 3 months

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Choosing a cipher

by Thompson, Jeff

The TLS handshake between my device and ghs.googlehosted.com gets stalled when the server sends the device a Change Cipher Spec message-the device waits forever, wanting 5 more bytes. From what I Google'd, I need to change the cipher suite I'm using. How do I know which cipher the server doesn't like (so I can avoid that in future), and which one I should be using-there are scores of these available in the config file, though some of them clearly should not be used, as they are commented that way.. Jeff Thompson | Senior Electrical Engineer-Firmware +1 704 752 6513 x1394 www.invue.com [cid:image001.gif@01D64B9D.863E3220]

6 years, 3 months

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SSL/TLS Handshake Failure

by Thompson, Jeff

Much thanks to Manuel and Gilles for helping me get this far! I'm trying to connect to endpoint hosted by Google for IoT devices. The handshake appears to progress through certificate verification and key exchange, encrypts a payload and then times out waiting for 5 expected bytes. I've attached the last part of the mbedTLS output generated with DEBUG_LEVEL 5 (the entrie thing is too big to include here). I'm sure the problem is either my code, network configuration, or somewhere else on my end. Can anyone give me a clue as to what might be wrong? The starting point for attempting the connection is https_client_tls_xchg(), found in the attached snippet from the example httpsclient.c file as I've modified it. FWIW, I'm using mbedTLS 2.13.1 running on an MIMXRT1062DVJ6A with MCUXpresso SDK 2.6.2. My HTTPS client is based on NXPs example project lwip_httpscli_mbedtls_freertos. Thanks, Jeff Thompson | Senior Electrical Engineer-Firmware +1 704 752 6513 x1394 www.invue.com [cid:image001.gif@01D64AE1.D6CB8F10]

6 years, 3 months

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Re: [mbed-tls] Working with a PEM file

by Gilles Peskine

[I assume you meant to reply to the list.] If you don't have a filesystem, call mbedtls_x509_crt_parse instead of mbedtls_x509_crt_parse_file. To save static data size, you may want to store the data in binary form instead of base64. To do this: 1. Split the PEM file into individual certificates. 2. Convert each file to DER (you can use programs/util/pem2der, but you need to split the file first, because it only converts the first PEM chunk). 3. Convert each binary file to a C unsigned char array literal. 4. In your code, call mbedtls_x509_crt_parse_der in a loop over the array. Your code might look something like this: const uint8_t cert1_der[] = {0x30, …}; const uint8_t cert2_der[] = {0x30, …}; … const struct {const uint8_t *data; size_t size;} root_certs_der = { {cert1_der, sizeof(cert1_der)}, … }; … mbedtls_x509_crt roots; mbedtls_x509_crt_init(&roots); for (i = 0; i < sizeof(root_certs_der)/sizeof(root_certs_der[0]); i++) mbedtls_x509_crt_parse_der(&roots, root_certs_der[i].data, root_certs_der[i].size); Best regards, -- Gilles Peskine Mbed TLS developer On 23/06/2020 23:31, Thompson, Jeff wrote: > I did see that function, but it assumes a file system, doesn't it? I'm not using one, and that would be a really big change to make this late in the development cycle, if I can avoid it. I can program the PEM file into flash memory, where it can be addressed, for reading only, just like ROM. Is there a way to use it like that? > > Jeff Thompson | Senior Electrical Engineer-Firmware > +1 704 752 6513 x1394 > www.invue.com > -----Original Message----- > From: mbed-tls <mbed-tls-bounces(a)lists.trustedfirmware.org> On Behalf Of Gilles Peskine via mbed-tls > Sent: Tuesday, June 23, 2020 4:38 PM > To: mbed-tls(a)lists.trustedfirmware.org > Subject: Re: [mbed-tls] Working with a PEM file > > Hi Jeff, > > Don't modify or use the certificates in certs.c. The certificates in the certs module are only intended for testing and they will be moved from the library to the test code soon. They are never used automatically and should never be used outside of tests. > > The easiest way to set these root certificates is to pass the file to mbedtls_x509_crt_parse_file(). This gives you an object that represents the certificates and you can use those as the trusted CAs for certificate verification through the X.509 or TLS API. > > Your code might look like this (error checking and rest of the code > omitted): > > mbedtls_x509_crt roots; // head of the list of trusted CAs mbedtls_x509_crt_init(&roots); mbedtls_x509_crt_parse_file(&roots, "roots.pem"); … // Verify that there is a chain of trust from a certificate to one of the trusted CAs mbedtls_x509_crt_verify(&crt_to_verify, &roots, NULL, NULL, &flags, NULL, NULL); … // Use the trusted CAs for a TLS connection mbedtls_ssl_conf_ca_chain(&ssl_config, roots, NULL); … // Once the certificates are no longer used anywhere mbedtls_x509_crt_free(&roots); > > > Best regards, > > -- > Gilles Peskine > Mbed TLS developer > > On 23/06/2020 21:38, Thompson, Jeff via mbed-tls wrote: >> I’ve downloaded https://pki.goog/roots.pem and want to use the >> certificates in it with mbedTLS. Is there some documentation that >> tells me how to do this? >> >> >> >> The certs.c file only contains only a handful of certs, while the PEM >> file has nearly 40. How do I know which one to use for what purpose? >> The certs.c file has these certificate char[]’s: >> >> >> >> mbedtls_test_ca_crt_ec >> >> mbedtls_test_srv_crt_ec >> >> mbedtls_test_cli_crt_ec >> >> mbedtls_test_ca_crt_rsa >> >> mbedtls_test_ca_crt_rsa >> >> mbedtls_test_srv_crt_rsa >> >> mbedtls_test_cli_crt_rsa >> >> >> >> I’m reasonably sure I don’t need to replace mbedtls_test_cli_crt_ec >> and mbedtls_test_cli_crt_rsa, since I am not using a client >> certificate. But I’m not at all sure about whether I need to replace >> the 3 **_ca_crt_** certs, the 2 **_srv_crt_** certs, or all 5. And, if >> so, using which certs from the PEM file to replace which certs in >> certs.c?. How do I figure out what to do here? I’ve never dealt with >> cloud communication like this before, so please pardon my ignorance; >> I’m eager to learn, but overwhelmed by so much that is new to me. >> >> >> >> Thanks, >> >> >> >> *Jeff Thompson* | Senior Electrical Engineer-Firmware >> +1 704 752 6513 x1394 >> www.invue.com >> >> >> >> > > -- > mbed-tls mailing list > mbed-tls(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/mbed-tls

6 years, 3 months

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Re: [mbed-tls] Working with a PEM file

by Gilles Peskine

Hi Jeff, Don't modify or use the certificates in certs.c. The certificates in the certs module are only intended for testing and they will be moved from the library to the test code soon. They are never used automatically and should never be used outside of tests. The easiest way to set these root certificates is to pass the file to mbedtls_x509_crt_parse_file(). This gives you an object that represents the certificates and you can use those as the trusted CAs for certificate verification through the X.509 or TLS API. Your code might look like this (error checking and rest of the code omitted): mbedtls_x509_crt roots; // head of the list of trusted CAs mbedtls_x509_crt_init(&roots); mbedtls_x509_crt_parse_file(&roots, "roots.pem"); … // Verify that there is a chain of trust from a certificate to one of the trusted CAs mbedtls_x509_crt_verify(&crt_to_verify, &roots, NULL, NULL, &flags, NULL, NULL); … // Use the trusted CAs for a TLS connection mbedtls_ssl_conf_ca_chain(&ssl_config, roots, NULL); … // Once the certificates are no longer used anywhere mbedtls_x509_crt_free(&roots); Best regards, -- Gilles Peskine Mbed TLS developer On 23/06/2020 21:38, Thompson, Jeff via mbed-tls wrote: > > I’ve downloaded https://pki.goog/roots.pem and want to use the > certificates in it with mbedTLS. Is there some documentation that > tells me how to do this? > > > > The certs.c file only contains only a handful of certs, while the PEM > file has nearly 40. How do I know which one to use for what purpose? > The certs.c file has these certificate char[]’s: > > > > mbedtls_test_ca_crt_ec > > mbedtls_test_srv_crt_ec > > mbedtls_test_cli_crt_ec > > mbedtls_test_ca_crt_rsa > > mbedtls_test_ca_crt_rsa > > mbedtls_test_srv_crt_rsa > > mbedtls_test_cli_crt_rsa > > > > I’m reasonably sure I don’t need to replace mbedtls_test_cli_crt_ec > and mbedtls_test_cli_crt_rsa, since I am not using a client > certificate. But I’m not at all sure about whether I need to replace > the 3 **_ca_crt_** certs, the 2 **_srv_crt_** certs, or all 5. And, if > so, using which certs from the PEM file to replace which certs in > certs.c?. How do I figure out what to do here? I’ve never dealt with > cloud communication like this before, so please pardon my ignorance; > I’m eager to learn, but overwhelmed by so much that is new to me. > > > > Thanks, > > > > *Jeff Thompson* | Senior Electrical Engineer-Firmware > +1 704 752 6513 x1394 > www.invue.com > > > >

6 years, 3 months

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Working with a PEM file

by Thompson, Jeff

I've downloaded https://pki.goog/roots.pem and want to use the certificates in it with mbedTLS. Is there some documentation that tells me how to do this? The certs.c file only contains only a handful of certs, while the PEM file has nearly 40. How do I know which one to use for what purpose? The certs.c file has these certificate char[]'s: mbedtls_test_ca_crt_ec mbedtls_test_srv_crt_ec mbedtls_test_cli_crt_ec mbedtls_test_ca_crt_rsa mbedtls_test_ca_crt_rsa mbedtls_test_srv_crt_rsa mbedtls_test_cli_crt_rsa I'm reasonably sure I don't need to replace mbedtls_test_cli_crt_ec and mbedtls_test_cli_crt_rsa, since I am not using a client certificate. But I'm not at all sure about whether I need to replace the 3 *_ca_crt_* certs, the 2 *_srv_crt_* certs, or all 5. And, if so, using which certs from the PEM file to replace which certs in certs.c?. How do I figure out what to do here? I've never dealt with cloud communication like this before, so please pardon my ignorance; I'm eager to learn, but overwhelmed by so much that is new to me. Thanks, Jeff Thompson | Senior Electrical Engineer-Firmware +1 704 752 6513 x1394 www.invue.com [cid:image001.gif@01D64974.02162CD0]

6 years, 3 months

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Re: [mbed-tls] Using mbed without a client certificate

by Manuel Pegourie-Gonnard

Hi Jeff, if you don't want to provision a client certificate in your TLS client, all you have to do is to not call `mbedtls_ssl_conf_own_cert()` in your client code. Then the library will send an empty certificate list as required by the standard. Actually in the example code you have, if you look at the second and third argument in the call to `mbedtls_ssl_conf_own_cert()`, you should be able to remove all references to those arguments, and end up with a functional example without client certificates. Also, you might want to have a look at this example from our source, which is a simple client without client-side certificates: https://github.com/ARMmbed/mbedtls/blob/development/programs/ssl/ssl_client… Hope that helps, 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: 22 June 2020 16:03 To: 'mbed-tls(a)lists.trustedfirmware.org' <mbed-tls(a)lists.trustedfirmware.org> Subject: [mbed-tls] Using mbed without a client certificate I'm usiing: #define MBEDTLS_VERSION_NUMBER 0x020D0100 #define MBEDTLS_VERSION_STRING "2.13.1" #define MBEDTLS_VERSION_STRING_FULL "mbed TLS 2.13.1" According to RFC5246: If no suitable certificate is available, the client MUST send a certificate message containing no certificates. That is, the certificate_list structure has a length of zero. How do I do this with mbedTLS? The example code I have has certificates in it and calls mbedtls_x509_crt_parse(), which wants a list of certificates and will reject a zero-length list. Jeff Thompson | Senior Electrical Engineer-Firmware +1 704 752 6513 x1394 www.invue.com [cid:image001.gif@01D64864.692FAD30]

6 years, 3 months

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Re: [mbed-tls] BLE and Mbed TLS

by Janos Follath

Hi, The packet size limitations can be accommodated by using the Maximum Fragment Length extension (https://tools.ietf.org/html/rfc6066#section-4, enabled by MBEDTLS_SSL_MAX_FRAGMENT_LENGTH in Mbed TLS). In Mbed TLS this is only implemented for application data and DTLS handshake messages so far, and therefore you will need to use DTLS. Also the negotiation is driven by the client and it needs to be enabled both on the server and on the client. (See the documentation of mbedtls_ssl_conf_max_frag_len() for more details.) I hope that helps, Janos From: mbed-tls <mbed-tls-bounces(a)lists.trustedfirmware.org> on behalf of "Fatima, Fariya via mbed-tls" <mbed-tls(a)lists.trustedfirmware.org> Reply to: "Fatima, Fariya" <Fariya.Fatima(a)Carrier.com> Date: Tuesday, 23 June 2020 at 11:47 To: "mbed-tls(a)lists.trustedfirmware.org" <mbed-tls(a)lists.trustedfirmware.org> Subject: Re: [mbed-tls] BLE and Mbed TLS Hi, Can anyone help if mbedTLS TLS/DTLS code would work on top of BLE (specifically SPP). I am not sure if the packet size limitation on SPP would make TLS work.. any pointers anyone? Would be really helpful. Regards, Fariya From: Fatima, Fariya Sent: Monday, June 15, 2020 9:21 AM To: 'mbed-tls(a)lists.trustedfirmware.org' <mbed-tls(a)lists.trustedfirmware.org> Subject: BLE and Mbed TLS Hi, I wanted to use TLS over BLE application. When I googled, I figured out that MbedTLS can work on BLE. If someone can share a sample application where-in MbedTLS APIs are used as part of a BT/BLE application, it will be of great help. Regards, Fariya

6 years, 3 months

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Re: [mbed-tls] BLE and Mbed TLS

by Fatima, Fariya

Hi, Can anyone help if mbedTLS TLS/DTLS code would work on top of BLE (specifically SPP). I am not sure if the packet size limitation on SPP would make TLS work.. any pointers anyone? Would be really helpful. Regards, Fariya From: Fatima, Fariya Sent: Monday, June 15, 2020 9:21 AM To: 'mbed-tls(a)lists.trustedfirmware.org' <mbed-tls(a)lists.trustedfirmware.org> Subject: BLE and Mbed TLS Hi, I wanted to use TLS over BLE application. When I googled, I figured out that MbedTLS can work on BLE. If someone can share a sample application where-in MbedTLS APIs are used as part of a BT/BLE application, it will be of great help. Regards, Fariya

6 years, 3 months

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Re: [mbed-tls] ECDH set custom private key

by Manuel Pegourie-Gonnard

Hi Oleksandr, I understand you want to validate your implementation against the test vectors in the cited reference. It's obvious, but just in case my reply is read out of context some day, I want to emphasize: what I'm recommending below is for testing purposes only, importing a private key from a public reference must never be done in production. In your situation the simplest way to proceed is probably to directly import the private and public key from the test vector to your ECDH context. For example (assuming the data in the reference is big-endian, and omitting error checking for brevity): static unsigned char private_a[32] = { 0x3f, 0x49, /* ... from the reference */ }; static unsigned char public_a[65] = { 0x04, /* this special value marks the start of an uncompressed public key */ 0x20, 0xb0, /* ... (public A(x) from the reference) */ 0xdc, 0x80, /* ... (public B(x) from the reference) */ }; static mbedtls_ecdh_context ctx_a; mbedtls_ecdh_init(&ctx_a); /* load the private/public key pair * this replaces mbedtls_ecdh_gen_public() */ mbedtls_mpi_read_binary( &ctx_a->d, private_a, sizeof( private_a ) ); /* should check errors! */ mbedtls_ecp_point_read_binary( &ctx_a->Q, public_a, sizeof( public_a ) ); /* should check errors! */ Doing the same with ctx_b and then exchanging public keys and computing the shared secret as usual, you should obtain values that match the reference. Again, this is only for validating against known test vectors. Importing a private key from a public reference must never be done in production. Hope that helps, Manuel. ________________________________ From: mbed-tls <mbed-tls-bounces(a)lists.trustedfirmware.org> on behalf of Oleksandr Nychyporuk via mbed-tls <mbed-tls(a)lists.trustedfirmware.org> Sent: 22 June 2020 15:33 To: mbed-tls(a)lists.trustedfirmware.org <mbed-tls(a)lists.trustedfirmware.org> Subject: [mbed-tls] ECDH set custom private key Hi, I wanna configure the ECDH algorithm to repeat the following keys: [image.png] I was able to configure the algorithm, generate private and public keys on both: client and server sides. And it works as expected. The secret keys are equal on both sides. But I did not manage to calculate the secret key that is on the picture. I do not know how to set these private keys. Could someone help me to do that? Thanks,

6 years, 3 months

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Using mbed without a client certificate

by Thompson, Jeff

I'm usiing: #define MBEDTLS_VERSION_NUMBER 0x020D0100 #define MBEDTLS_VERSION_STRING "2.13.1" #define MBEDTLS_VERSION_STRING_FULL "mbed TLS 2.13.1" According to RFC5246: If no suitable certificate is available, the client MUST send a certificate message containing no certificates. That is, the certificate_list structure has a length of zero. How do I do this with mbedTLS? The example code I have has certificates in it and calls mbedtls_x509_crt_parse(), which wants a list of certificates and will reject a zero-length list. Jeff Thompson | Senior Electrical Engineer-Firmware +1 704 752 6513 x1394 www.invue.com [cid:image001.gif@01D64864.692FAD30]

6 years, 3 months

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Re: [mbed-tls] mbed-tls Digest, Vol 4, Issue 15

by Oleksandr Nychyporuk

Attaching the keys from the picture: *7.1.2.1 P-256 Data Set 1* *Private A*: 3f49f6d4 a3c55f38 74c9b3e3 d2103f50 4aff607b eb40b799 5899b8a6 cd3c1abd *Private B*: 55188b3d 32f6bb9a 900afcfb eed4e72a 59cb9ac2 f19d7cfb 6b4fdd49 f47fc5fd *Public A(x):* 20b003d2 f297be2c 5e2c83a7 e9f9a5b9 eff49111 acf4fddb cc030148 0e359de6 *Public A(y)*: dc809c49 652aeb6d 63329abf 5a52155c 766345c2 8fed3024 741c8ed0 1589d28b *Public B(x)*: 1ea1f0f0 1faf1d96 09592284 f19e4c00 47b58afd 8615a69f 559077b2 2faaa190 *Public B(y)*: 4c55f33e 429dad37 7356703a 9ab85160 472d1130 e28e3676 5f89aff9 15b1214a *DHKey*: ec0234a3 57c8ad05 341010a6 0a397d9b 99796b13 b4f866f1 868d34f3 73bfa698 пн, 22 черв. 2020 о 16:33 <mbed-tls-request(a)lists.trustedfirmware.org> пише: > Send mbed-tls mailing list submissions to > mbed-tls(a)lists.trustedfirmware.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.trustedfirmware.org/mailman/listinfo/mbed-tls > or, via email, send a message with subject or body 'help' to > mbed-tls-request(a)lists.trustedfirmware.org > > You can reach the person managing the list at > mbed-tls-owner(a)lists.trustedfirmware.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of mbed-tls digest..." > > > Today's Topics: > > 1. ECDH set custom private key (Oleksandr Nychyporuk) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 22 Jun 2020 16:33:15 +0300 > From: Oleksandr Nychyporuk <olexandr.nychyporuk(a)gmail.com> > To: mbed-tls(a)lists.trustedfirmware.org > Subject: [mbed-tls] ECDH set custom private key > Message-ID: > <CAAjyQQ4kQ8J-iVSV_yputKD83G9Aj65fYEWJ= > ObPTeptXogghw(a)mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Hi, > > I wanna configure the ECDH algorithm to repeat the following keys: > [image: image.png] > > I was able to configure the algorithm, generate private and public keys on > both: client and server sides. And it works as expected. The secret keys > are equal on both sides. > But I did not manage to calculate the secret key that is on the picture. I > do not know how to set these private keys. Could someone help me to do > that? > > Thanks, >

6 years, 3 months

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ECDH set custom private key

by Oleksandr Nychyporuk

Hi, I wanna configure the ECDH algorithm to repeat the following keys: [image: image.png] I was able to configure the algorithm, generate private and public keys on both: client and server sides. And it works as expected. The secret keys are equal on both sides. But I did not manage to calculate the secret key that is on the picture. I do not know how to set these private keys. Could someone help me to do that? Thanks,

6 years, 3 months

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Re: [mbed-tls] How to enable mbedtls complete debug logs?

by Srinivasa Rao Ragolu

Hi Hannes, See the output of ssl_client2 output with command line arguments Could you please help me in resolving the issue. Same source code on Ubuntu is working fine but not working on my embedded device(STM32MP157x-EV1) Your support is appreciated. =450a-certificate.pem.crt key_file=/certs/774a17950a-private.pem.key debug_leve . Seeding the random number generator... ok . Loading the CA root certificate ... ok (0 skipped) . Loading the client cert. and key... ok . Connecting to tcp/a2g7twmqo7hg82-ats.iot.ap-south-1.amazonaws.com/443... ok . Setting up the SSL/TLS structure...ssl_tls.c:0081: |3| set_timer to 0 ms ok . Performing the SSL/TLS handshake...ssl_tls.c:8084: |2| => handshake ssl_cli.c:3510: |2| client state: 0 ssl_tls.c:2755: |2| => flush output ssl_tls.c:2767: |2| <= flush output ssl_cli.c:3510: |2| client state: 1 ssl_tls.c:2755: |2| => flush output ssl_tls.c:2767: |2| <= flush output ssl_cli.c:0774: |2| => write client hello ssl_cli.c:0812: |3| client hello, max version: [3:3] ssl_cli.c:0703: |3| client hello, current time: 1592572806 ssl_cli.c:0821: |3| dumping 'client hello, random bytes' (32 bytes) ssl_cli.c:0821: |3| 0000: 5e ec bb 86 f1 65 15 c9 27 e1 12 b3 af 40 7d ab ^....e..'....@}. ssl_cli.c:0821: |3| 0010: 16 2e 28 f5 f6 e1 82 9b 2d 5c e7 93 e1 e6 e8 17 ..(.....-\...... ssl_cli.c:0874: |3| client hello, session id len.: 0 ssl_cli.c:0875: |3| dumping 'client hello, session id' (0 bytes) ssl_cli.c:0922: |3| client hello, add ciphersuite: cca8 ssl_cli.c:0922: |3| client hello, add ciphersuite: cca9 ssl_cli.c:0922: |3| client hello, add ciphersuite: ccaa ssl_cli.c:0922: |3| client hello, add ciphersuite: c02c ssl_cli.c:0922: |3| client hello, add ciphersuite: c030 ssl_cli.c:0922: |3| client hello, add ciphersuite: 009f ssl_cli.c:0922: |3| client hello, add ciphersuite: c0ad ssl_cli.c:0922: |3| client hello, add ciphersuite: c09f ssl_cli.c:0922: |3| client hello, add ciphersuite: c024 ssl_cli.c:0922: |3| client hello, add ciphersuite: c028 ssl_cli.c:0922: |3| client hello, add ciphersuite: 006b ssl_cli.c:0922: |3| client hello, add ciphersuite: c00a ssl_cli.c:0922: |3| client hello, add ciphersuite: c014 ssl_cli.c:0922: |3| client hello, add ciphersuite: 0039 ssl_cli.c:0922: |3| client hello, add ciphersuite: c0af ssl_cli.c:0922: |3| client hello, add ciphersuite: c0a3 ssl_cli.c:0922: |3| client hello, add ciphersuite: c087 ssl_cli.c:0922: |3| client hello, add ciphersuite: c08b ssl_cli.c:0922: |3| client hello, add ciphersuite: c07d ssl_cli.c:0922: |3| client hello, add ciphersuite: c073 ssl_cli.c:0922: |3| client hello, add ciphersuite: c077 ssl_cli.c:0922: |3| client hello, add ciphersuite: 00c4 ssl_cli.c:0922: |3| client hello, add ciphersuite: 0088 ssl_cli.c:0922: |3| client hello, add ciphersuite: c02b ssl_cli.c:0922: |3| client hello, add ciphersuite: c02f ssl_cli.c:0922: |3| client hello, add ciphersuite: 009e ssl_cli.c:0922: |3| client hello, add ciphersuite: c0ac ssl_cli.c:0922: |3| client hello, add ciphersuite: c09e ssl_cli.c:0922: |3| client hello, add ciphersuite: c023 ssl_cli.c:0922: |3| client hello, add ciphersuite: c027 ssl_cli.c:0922: |3| client hello, add ciphersuite: 0067 ssl_cli.c:0922: |3| client hello, add ciphersuite: c009 ssl_cli.c:0922: |3| client hello, add ciphersuite: c013 ssl_cli.c:0922: |3| client hello, add ciphersuite: 0033 ssl_cli.c:0922: |3| client hello, add ciphersuite: c0ae ssl_cli.c:0922: |3| client hello, add ciphersuite: c0a2 ssl_cli.c:0922: |3| client hello, add ciphersuite: c086 ssl_cli.c:0922: |3| client hello, add ciphersuite: c08a ssl_cli.c:0922: |3| client hello, add ciphersuite: c07c ssl_cli.c:0922: |3| client hello, add ciphersuite: c072 ssl_cli.c:0922: |3| client hello, add ciphersuite: c076 ssl_cli.c:0922: |3| client hello, add ciphersuite: 00be ssl_cli.c:0922: |3| client hello, add ciphersuite: 0045 ssl_cli.c:0922: |3| client hello, add ciphersuite: ccac ssl_cli.c:0922: |3| client hello, add ciphersuite: ccad ssl_cli.c:0922: |3| client hello, add ciphersuite: 00ab ssl_cli.c:0922: |3| client hello, add ciphersuite: c0a7 ssl_cli.c:0922: |3| client hello, add ciphersuite: c038 ssl_cli.c:0922: |3| client hello, add ciphersuite: 00b3 ssl_cli.c:0922: |3| client hello, add ciphersuite: c036 ssl_cli.c:0922: |3| client hello, add ciphersuite: 0091 ssl_cli.c:0922: |3| client hello, add ciphersuite: c091 ssl_cli.c:0922: |3| client hello, add ciphersuite: c09b ssl_cli.c:0922: |3| client hello, add ciphersuite: c097 ssl_cli.c:0922: |3| client hello, add ciphersuite: c0ab ssl_cli.c:0922: |3| client hello, add ciphersuite: 00aa ssl_cli.c:0922: |3| client hello, add ciphersuite: c0a6 ssl_cli.c:0922: |3| client hello, add ciphersuite: c037 ssl_cli.c:0922: |3| client hello, add ciphersuite: 00b2 ssl_cli.c:0922: |3| client hello, add ciphersuite: c035 ssl_cli.c:0922: |3| client hello, add ciphersuite: 0090 ssl_cli.c:0922: |3| client hello, add ciphersuite: c090 ssl_cli.c:0922: |3| client hello, add ciphersuite: c096 ssl_cli.c:0922: |3| client hello, add ciphersuite: c09a ssl_cli.c:0922: |3| client hello, add ciphersuite: c0aa ssl_cli.c:0922: |3| client hello, add ciphersuite: 009d ssl_cli.c:0922: |3| client hello, add ciphersuite: c09d ssl_cli.c:0922: |3| client hello, add ciphersuite: 003d ssl_cli.c:0922: |3| client hello, add ciphersuite: 0035 ssl_cli.c:0922: |3| client hello, add ciphersuite: c032 ssl_cli.c:0922: |3| client hello, add ciphersuite: c02a ssl_cli.c:0922: |3| client hello, add ciphersuite: c00f ssl_cli.c:0922: |3| client hello, add ciphersuite: c02e ssl_cli.c:0922: |3| client hello, add ciphersuite: c026 ssl_cli.c:0922: |3| client hello, add ciphersuite: c005 ssl_cli.c:0922: |3| client hello, add ciphersuite: c0a1 ssl_cli.c:0922: |3| client hello, add ciphersuite: c07b ssl_cli.c:0922: |3| client hello, add ciphersuite: 00c0 ssl_cli.c:0922: |3| client hello, add ciphersuite: 0084 ssl_cli.c:0922: |3| client hello, add ciphersuite: c08d ssl_cli.c:0922: |3| client hello, add ciphersuite: c079 ssl_cli.c:0922: |3| client hello, add ciphersuite: c089 ssl_cli.c:0922: |3| client hello, add ciphersuite: c075 ssl_cli.c:0922: |3| client hello, add ciphersuite: 009c ssl_cli.c:0922: |3| client hello, add ciphersuite: c09c ssl_cli.c:0922: |3| client hello, add ciphersuite: 003c ssl_cli.c:0922: |3| client hello, add ciphersuite: 002f ssl_cli.c:0922: |3| client hello, add ciphersuite: c031 ssl_cli.c:0922: |3| client hello, add ciphersuite: c029 ssl_cli.c:0922: |3| client hello, add ciphersuite: c00e ssl_cli.c:0922: |3| client hello, add ciphersuite: c02d ssl_cli.c:0922: |3| client hello, add ciphersuite: c025 ssl_cli.c:0922: |3| client hello, add ciphersuite: c004 ssl_cli.c:0922: |3| client hello, add ciphersuite: c0a0 ssl_cli.c:0922: |3| client hello, add ciphersuite: c07a ssl_cli.c:0922: |3| client hello, add ciphersuite: 00ba ssl_cli.c:0922: |3| client hello, add ciphersuite: 0041 ssl_cli.c:0922: |3| client hello, add ciphersuite: c08c ssl_cli.c:0922: |3| client hello, add ciphersuite: c078 ssl_cli.c:0922: |3| client hello, add ciphersuite: c088 ssl_cli.c:0922: |3| client hello, add ciphersuite: c074 ssl_cli.c:0922: |3| client hello, add ciphersuite: ccae ssl_cli.c:0922: |3| client hello, add ciphersuite: 00ad ssl_cli.c:0922: |3| client hello, add ciphersuite: 00b7 ssl_cli.c:0922: |3| client hello, add ciphersuite: 0095 ssl_cli.c:0922: |3| client hello, add ciphersuite: c093 ssl_cli.c:0922: |3| client hello, add ciphersuite: c099 ssl_cli.c:0922: |3| client hello, add ciphersuite: 00ac ssl_cli.c:0922: |3| client hello, add ciphersuite: 00b6 ssl_cli.c:0922: |3| client hello, add ciphersuite: 0094 ssl_cli.c:0922: |3| client hello, add ciphersuite: c092 ssl_cli.c:0922: |3| client hello, add ciphersuite: c098 ssl_cli.c:0922: |3| client hello, add ciphersuite: ccab ssl_cli.c:0922: |3| client hello, add ciphersuite: 00a9 ssl_cli.c:0922: |3| client hello, add ciphersuite: c0a5 ssl_cli.c:0922: |3| client hello, add ciphersuite: 00af ssl_cli.c:0922: |3| client hello, add ciphersuite: 008d ssl_cli.c:0922: |3| client hello, add ciphersuite: c08f ssl_cli.c:0922: |3| client hello, add ciphersuite: c095 ssl_cli.c:0922: |3| client hello, add ciphersuite: c0a9 ssl_cli.c:0922: |3| client hello, add ciphersuite: 00a8 ssl_cli.c:0922: |3| client hello, add ciphersuite: c0a4 ssl_cli.c:0922: |3| client hello, add ciphersuite: 00ae ssl_cli.c:0922: |3| client hello, add ciphersuite: 008c ssl_cli.c:0922: |3| client hello, add ciphersuite: c08e ssl_cli.c:0922: |3| client hello, add ciphersuite: c094 ssl_cli.c:0922: |3| client hello, add ciphersuite: c0a8 ssl_cli.c:0934: |3| client hello, got 127 ciphersuites (excluding SCSVs) ssl_cli.c:0943: |3| adding EMPTY_RENEGOTIATION_INFO_SCSV ssl_cli.c:0992: |3| client hello, compress len.: 1 ssl_cli.c:0994: |3| client hello, compress alg.: 0 ssl_cli.c:0069: |3| client hello, adding server name extension: a2g7twmqo7hg82-ats.iot.ap-south-1.amazonaws.com ssl_cli.c:0186: |3| client hello, adding signature_algorithms extension ssl_cli.c:0271: |3| client hello, adding supported_elliptic_curves extension ssl_cli.c:0336: |3| client hello, adding supported_point_formats extension ssl_cli.c:0518: |3| client hello, adding encrypt_then_mac extension ssl_cli.c:0552: |3| client hello, adding extended_master_secret extension ssl_cli.c:0585: |3| client hello, adding session ticket extension ssl_cli.c:1071: |3| client hello, total extension length: 128 ssl_tls.c:3184: |2| => write handshake message ssl_tls.c:3343: |2| => write record ssl_tls.c:3423: |3| output record: msgtype = 22, version = [3:1], msglen = 429 ssl_tls.c:3426: |4| dumping 'output record sent to network' (434 bytes) ssl_tls.c:3426: |4| 0000: 16 03 01 01 ad 01 00 01 a9 03 03 5e ec bb 86 f1 ...........^.... ssl_tls.c:3426: |4| 0010: 65 15 c9 27 e1 12 b3 af 40 7d ab 16 2e 28 f5 f6 e..'....@}...(.. ssl_tls.c:3426: |4| 0020: e1 82 9b 2d 5c e7 93 e1 e6 e8 17 00 01 00 cc a8 ...-\........... ssl_tls.c:3426: |4| 0030: cc a9 cc aa c0 2c c0 30 00 9f c0 ad c0 9f c0 24 .....,.0.......$ ssl_tls.c:3426: |4| 0040: c0 28 00 6b c0 0a c0 14 00 39 c0 af c0 a3 c0 87 .(.k.....9...... ssl_tls.c:3426: |4| 0050: c0 8b c0 7d c0 73 c0 77 00 c4 00 88 c0 2b c0 2f ...}.s.w.....+./ ssl_tls.c:3426: |4| 0060: 00 9e c0 ac c0 9e c0 23 c0 27 00 67 c0 09 c0 13 .......#.'.g.... ssl_tls.c:3426: |4| 0070: 00 33 c0 ae c0 a2 c0 86 c0 8a c0 7c c0 72 c0 76 .3.........|.r.v ssl_tls.c:3426: |4| 0080: 00 be 00 45 cc ac cc ad 00 ab c0 a7 c0 38 00 b3 ...E.........8.. ssl_tls.c:3426: |4| 0090: c0 36 00 91 c0 91 c0 9b c0 97 c0 ab 00 aa c0 a6 .6.............. ssl_tls.c:3426: |4| 00a0: c0 37 00 b2 c0 35 00 90 c0 90 c0 96 c0 9a c0 aa .7...5.......... ssl_tls.c:3426: |4| 00b0: 00 9d c0 9d 00 3d 00 35 c0 32 c0 2a c0 0f c0 2e .....=.5.2.*.... ssl_tls.c:3426: |4| 00c0: c0 26 c0 05 c0 a1 c0 7b 00 c0 00 84 c0 8d c0 79 .&.....{.......y ssl_tls.c:3426: |4| 00d0: c0 89 c0 75 00 9c c0 9c 00 3c 00 2f c0 31 c0 29 ...u.....<./.1.) ssl_tls.c:3426: |4| 00e0: c0 0e c0 2d c0 25 c0 04 c0 a0 c0 7a 00 ba 00 41 ...-.%.....z...A ssl_tls.c:3426: |4| 00f0: c0 8c c0 78 c0 88 c0 74 cc ae 00 ad 00 b7 00 95 ...x...t........ ssl_tls.c:3426: |4| 0100: c0 93 c0 99 00 ac 00 b6 00 94 c0 92 c0 98 cc ab ................ ssl_tls.c:3426: |4| 0110: 00 a9 c0 a5 00 af 00 8d c0 8f c0 95 c0 a9 00 a8 ................ ssl_tls.c:3426: |4| 0120: c0 a4 00 ae 00 8c c0 8e c0 94 c0 a8 00 ff 01 00 ................ ssl_tls.c:3426: |4| 0130: 00 80 00 00 00 34 00 32 00 00 2f 61 32 67 37 74 .....4.2../a2g7t ssl_tls.c:3426: |4| 0140: 77 6d 71 6f 37 68 67 38 32 2d 61 74 73 2e 69 6f wmqo7hg82-ats.io ssl_tls.c:3426: |4| 0150: 74 2e 61 70 2d 73 6f 75 74 68 2d 31 2e 61 6d 61 t.ap-south-1.ama ssl_tls.c:3426: |4| 0160: 7a 6f 6e 61 77 73 2e 63 6f 6d 00 0d 00 16 00 14 zonaws.com...... ssl_tls.c:3426: |4| 0170: 06 03 06 01 05 03 05 01 04 03 04 01 03 03 03 01 ................ ssl_tls.c:3426: |4| 0180: 02 03 02 01 00 0a 00 18 00 16 00 19 00 1c 00 18 ................ ssl_tls.c:3426: |4| 0190: 00 1b 00 17 00 16 00 1a 00 15 00 14 00 13 00 12 ................ ssl_tls.c:3426: |4| 01a0: 00 0b 00 02 01 00 00 16 00 00 00 17 00 00 00 23 ...............# ssl_tls.c:3426: |4| 01b0: 00 00 .. ssl_tls.c:2755: |2| => flush output ssl_tls.c:2774: |2| message length: 434, out_left: 434 ssl_tls.c:2779: |2| ssl->f_send() returned 434 (-0xfffffe4e) ssl_tls.c:2807: |2| <= flush output ssl_tls.c:3476: |2| <= write record ssl_tls.c:3320: |2| <= write handshake message ssl_cli.c:1106: |2| <= write client hello ssl_cli.c:3510: |2| client state: 2 ssl_tls.c:2755: |2| => flush output ssl_tls.c:2767: |2| <= flush output ssl_cli.c:1499: |2| => parse server hello ssl_tls.c:4311: |2| => read record ssl_tls.c:2536: |2| => fetch input ssl_tls.c:2697: |2| in_left: 0, nb_want: 5 ssl_tls.c:2721: |2| in_left: 0, nb_want: 5 ssl_tls.c:2722: |2| ssl->f_recv(_timeout)() returned -80 (-0x0050) ssl_tls.c:4973: |1| mbedtls_ssl_fetch_input() returned -80 (-0x0050) ssl_tls.c:4344: |1| ssl_get_next_record() returned -80 (-0x0050) ssl_cli.c:1506: |1| mbedtls_ssl_read_record() returned -80 (-0x0050) ssl_tls.c:8094: |2| <= handshake failed ! mbedtls_ssl_handshake returned -0x50 Last error was: -0x50 - NET - Connection was reset by peer ssl_tls.c:8934: |2| => free ssl_tls.c:8999: |2| <= free Regards, Srinivas. [cid:e050759f-7151-4fb6-8259-848135ad05b0] ________________________________ From: Hannes Tschofenig <Hannes.Tschofenig(a)arm.com> Sent: 19 June 2020 18:35 To: Srinivasa Rao Ragolu <srinivasa(a)alifsemi.com> Subject: RE: How to enable mbedtls complete debug logs? Hi Srinivas, Here is a good summary: https://tls.mbed.org/kb/development/debugging-tls If you just run the examples (such as ssl_client2 and ssl_server2) on the command line then you just need to use a command line parameter to set the debug level. Ciao Hannes From: mbed-tls <mbed-tls-bounces(a)lists.trustedfirmware.org> On Behalf Of Srinivasa Rao Ragolu via mbed-tls Sent: Friday, June 19, 2020 2:44 PM To: mbed-tls(a)lists.trustedfirmware.org Subject: [mbed-tls] How to enable mbedtls complete debug logs? Hi All, Please help me with the procedure, how to enable complete debug logs in mbedtls. Regards, Srinivas. [cid:image001.jpg@01D6464B.1CC8C6E0] 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.

6 years, 3 months

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How to enable mbedtls complete debug logs?

by Srinivasa Rao Ragolu

Hi All, Please help me with the procedure, how to enable complete debug logs in mbedtls. Regards, Srinivas. [cid:42424919-ffb4-4795-981d-a54ca257f268]

6 years, 3 months

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Mutual Authentication in TLS handshake - No client certificate passed

by Abhilash Iyer

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/ [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…, 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, 3 months

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About raising an issue on mbedTLS forum

by Aditya Patwardhan

Hello Sir/Madam, I work in Espressif Systems. I am currently working on providing an alternate hardware RSA sign implementation for mbedtls software sign for Espressif's new chip ESP32S2. I have gone through mbedTLS API in detail but I dont see any option where I can only replace mbedTLS software sign function with our hardware sign function . I have gone through the issue https://tls.mbed.org/discussions/generic/using-an-external-rsa-private-key I have seen that there is a function named `mbedtls_pk_setup_rsa_alt` where we only register private key related function to the ALT_CTX which mbedtls uses to perform RSA sign. but this is not supported for TLS connections. I have seen that there is MBEDTLS_RSA_ALT option in mbedTLS where we can provide alternate function to many of mbedTLS API, but we do not want to change any of the other functions, just provide alternate implementation of hardware sign. If we go with this way, there will be lot of duplicate code which will be needed to be maintained. can mbedTLS provide option to use mbedtls_rsa_alt context in its file `pkparse.c` so as to allow rsa sign using an extrnal private key. Thanks and Regards, Aditya P.S. - I raised the same issue yesterday, my issue was rejected stating I have not subscribed to the mailing-list. But I had already done that. I tried to subscribe again and it also said you are already subscribed.

6 years, 3 months

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Re: [mbed-tls] Link error when calling "altcp_tls_create_config_client"

by Janos Follath

These defines are needed when the platform doesn’t have standard functions like `calloc()` and `free()`. (You can find more details on the macros in `config.h`.) Regards, Janos From: mbed-tls <mbed-tls-bounces(a)lists.trustedfirmware.org> on behalf of songwei fu via mbed-tls <mbed-tls(a)lists.trustedfirmware.org> Reply to: "songwei.fu(a)web.de" <songwei.fu(a)web.de> Date: Wednesday, 17 June 2020 at 13:41 To: "Kaul, Martin" <Martin.Kaul(a)leuze.com> Cc: "mbed-tls(a)lists.trustedfirmware.org" <mbed-tls(a)lists.trustedfirmware.org> Subject: Re: [mbed-tls] Link error when calling "altcp_tls_create_config_client" Thanks Martin. It solved my problem! By adding $(CHIBIOS)/os/various/syscalls.c in the makefile and removing following defines, the linker error is gone. #define MBEDTLS_PLATFORM_C #define MBEDTLS_PLATFORM_MEMORY #define MBEDTLS_PLATFORM_CALLOC_MACRO chHeapAlloc #define MBEDTLS_PLATFORM_FREE_MACRO chHeapFree Now I wonder when these defines are needed? I thought I need to port them to the OS-specific memory allocation. like in freeRTOS, it would be "pvPortCalloc", and for chibios it would be chHeapAlloc. Anybody can give me some hint? -- Songwei Gesendet: Mittwoch, 17. Juni 2020 um 12:12 Uhr Von: "Kaul, Martin" <Martin.Kaul(a)leuze.com> An: "songwei.fu(a)web.de" <songwei.fu(a)web.de> Betreff: AW: [mbed-tls] Link error when calling "altcp_tls_create_config_client" Hi, _sbrk is need when you using heap memory, for example using malloc() – see following discussion in stackoverflow: https://stackoverflow.com/questions/32446814/undefined-reference-to-sbrk-in… Maybe that helps. Best regards Martin Von: mbed-tls [mailto:mbed-tls-bounces@lists.trustedfirmware.org] Im Auftrag von songwei fu via mbed-tls Gesendet: Mittwoch, 17. Juni 2020 11:49 An: mbed-tls(a)lists.trustedfirmware.org Betreff: [mbed-tls] Link error when calling "altcp_tls_create_config_client" Hi guys, I am new to the list and also to mbedTLS. Now I am trying to port mbedTLS to chibiOS. And when I called altcp_tls_create_config_client(cert, sizeof(cert)), I got a link error like following: c:/chibistudio/tools/gnu tools arm embedded/7.0 2017q4/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/lib/thumb/v7e-m\libg.a(lib_a-sbrkr.o): In function `_sbrk_r': sbrkr.c:(.text._sbrk_r+0xc): undefined reference to `_sbrk' And these are my settings: #define MBEDTLS_PLATFORM_C #define MBEDTLS_PLATFORM_MEMORY #define MBEDTLS_PLATFORM_CALLOC_MACRO chHeapAlloc #define MBEDTLS_PLATFORM_FREE_MACRO chHeapFree where chHeapAlloc and chHeapFree are the memory allocation functions from chibios. (1) Did I miss some settings? or i did something wrong? (2) I did not find much information about the porting from chibios side. Does anybody know where I can look for reference projects/docs? Any suggestion will be appreciated. Thanks. Songwei

6 years, 3 months

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Re: [mbed-tls] Link error when calling "altcp_tls_create_config_client"

by songwei.fu＠web.de

6 years, 3 months

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Re: [mbed-tls] Link error when calling "altcp_tls_create_config_client"

by Janos Follath

Hi Songwei, Welcome to the list and thank you for your interest in Mbed TLS! I found a similar issue on stack overflow: https://stackoverflow.com/questions/28895703/sbrk-function-not-found-when-p… Is this the same issue as yours? Regards, Janos From: mbed-tls <mbed-tls-bounces(a)lists.trustedfirmware.org> on behalf of songwei fu via mbed-tls <mbed-tls(a)lists.trustedfirmware.org> Reply to: "songwei.fu(a)web.de" <songwei.fu(a)web.de> Date: Wednesday, 17 June 2020 at 10:49 To: "mbed-tls(a)lists.trustedfirmware.org" <mbed-tls(a)lists.trustedfirmware.org> Subject: [mbed-tls] Link error when calling "altcp_tls_create_config_client" Hi guys, I am new to the list and also to mbedTLS. Now I am trying to port mbedTLS to chibiOS. And when I called altcp_tls_create_config_client(cert, sizeof(cert)), I got a link error like following: c:/chibistudio/tools/gnu tools arm embedded/7.0 2017q4/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/lib/thumb/v7e-m\libg.a(lib_a-sbrkr.o): In function `_sbrk_r': sbrkr.c:(.text._sbrk_r+0xc): undefined reference to `_sbrk' And these are my settings: #define MBEDTLS_PLATFORM_C #define MBEDTLS_PLATFORM_MEMORY #define MBEDTLS_PLATFORM_CALLOC_MACRO chHeapAlloc #define MBEDTLS_PLATFORM_FREE_MACRO chHeapFree where chHeapAlloc and chHeapFree are the memory allocation functions from chibios. (1) Did I miss some settings? or i did something wrong? (2) I did not find much information about the porting from chibios side. Does anybody know where I can look for reference projects/docs? Any suggestion will be appreciated. Thanks. Songwei

6 years, 3 months

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Link error when calling "altcp_tls_create_config_client"

by songwei.fu＠web.de

6 years, 3 months

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mbedtls_ssh_handshake error -0X50 when connecting to AWS

by Srinivasa Rao Ragolu

Hi All, I am working on Renesas RZA2M embedded board with Linux. It has limited memory of 6MB flash(R-Only) I am using mbedtls version 2.16.5 for aws iot sdk for embedded c according to https://docs.aws.amazon.com/iot/latest/developerguide/iot-embedded-c-sdk.ht… When I run sample application, it is taking 15 secs for "Seeding random generator number..." and throwing below error $ ./subscribe_publish_sample AWS IoT SDK Version 3.0.1- DEBUG: main L#159 rootCA /root/../certs/AmazonRootCA1.pem DEBUG: main L#160 clientCRT /root/../certs/774a17950a-certificate.pem.crt DEBUG: main L#161 clientKey /root/../certs/774a17950a-private.pem.key Connecting... DEBUG: iot_tls_connect L#130 . Seeding the random number generator... DEBUG: iot_tls_connect L#138 . Loading the CA root certificate ... DEBUG: iot_tls_connect L#144 ok (0 skipped) DEBUG: iot_tls_connect L#146 . Loading the client cert. and key... DEBUG: iot_tls_connect L#159 ok DEBUG: iot_tls_connect L#161 . Connecting to a2g7twmqo7hg82-ats.iot.ap-south-1.amazonaws.com/443... DEBUG: iot_tls_connect L#180 ok DEBUG: iot_tls_connect L#182 . Setting up the SSL/TLS structure... DEBUG: iot_tls_connect L#223 SSL state connect : 0 DEBUG: iot_tls_connect L#226 ok DEBUG: iot_tls_connect L#228 SSL state connect : 0 DEBUG: iot_tls_connect L#229 . Performing the SSL/TLS handshake... ERROR: iot_tls_connect L#232 failed ! mbedtls_ssl_handshake returned -0x50 ERROR: main L#190 Error(-4) connecting to a2g7twmqo7hg82-ats.iot.ap-south-1.amazonaws.com:443 For detailed debug log using ssl_client2, go through https://pastebin.com/mNXhB0xj<https://github.com/ARMmbed/mbedtls/issues/url> https://pastebin.com/mNXhB0xj my client device specifications $ cat /proc/cpuinfo processor : 0 model name : ARMv7 Processor rev 1 (v7l) BogoMIPS : 1056.00 Features : half thumb fastmult vfp edsp neon vfpv3 tls vfpd32 CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x4 CPU part : 0xc09 CPU revision : 1 Hardware : Generic R7S9210 (Flattened Device Tree) Revision : 0000 Serial : 0000000000000000 $ free total used free shared buffers cached Mem: 7544 4484 3060 40 0 304 -/+ buffers/cache: 4180 3364 Swap: 0 0 0 I am not getting any help to resolve this issue and spending days and days. I am suspecting the issue might be timing related (or) cpu clock related (or) memory footprint related (or) something else I need this forum help badly to resolve the issue. Please ping me if you need any other data. Thanks in advance, Srinivas. Regards, Srinivas. [cid:1eddf249-06f8-4cbd-a3e2-9c22437fd27f]

6 years, 3 months

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BLE and Mbed TLS

by Fatima, Fariya

Hi, I wanted to use TLS over BLE application. When I googled, I figured out that MbedTLS can work on BLE. If someone can share a sample application where-in MbedTLS APIs are used as part of a BT/BLE application, it will be of great help. Regards, Fariya

6 years, 3 months

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