AESM warning "Failed to set logging callback for the quote provider library."

[0xabu]

Hi,

I just installed az-dcap-client using the Ubuntu 18.04 packages, and it seems to be working correctly, but I noticed these warnings logged repeatedly from the AESM daemon (I am using SGX_AESM_ADDR to perform out-of-proc quote retrieval):

Jul 21 22:25:48 SGX-Temp-Test-VM aesm_service[25583]: [get_qpl_handle ../qe_logic.cpp:295] Failed to set logging callback for the quote provider library.

[oxxenix]

I am having a similar issue in Ubuntu 18.04:

`Warning: Cannot set QPL directory, you may get ECDSA quote with Encrypted PPID cert type.

[get_qpl_handle ../qe_logic.cpp:295] Failed to set logging callback for the quote provider library.[get_qpl_handle ../qe_logic.cpp:295] Failed to set logging callback for the quote provider library`

[csegarragonz]

I have reported the issue to the SGX repository, as it belongs there: intel/linux-sgx#812

[dimakuv]

Just FYI: we also observe the same problem on MS Azure VMs. The explanation for this iiuc is here: intel/linux-sgx#812.

Basically, Microsoft Azure provides a pre-installed special version of the Quote Provider library. This special version of the library does not have the sgx_ql_set_logging_callback() for whatever reason, and that is exactly what the AESM daemon expects. Interestingly, this Microsoft-Azure-special version of the library has sgx_ql_set_logging_function() -- a suspiciously similar function name. Is this just a mismatch in naming?

An alternative explanation may be that Microsoft-special version of the Quote Provider library uses the AZDCAP_DEBUG_LOG_LEVEL envvar, and so Microsoft relies on its own logging and doesn't want AESM to report any errors? That would be a strange decision, since AESM may report errors unrelated to the Quote Provider...

Also, since I'm here -- is this GitHub repository dead? I see multiple issues that are open for ~2 years, with no explanations by developers or "will fix" messages with no follow ups.

[msft-gumunjal]

I will take a look at this.