Description of problem:
We use gathered system facts (mostly output from dmidecode) to detect if the machine is running on public cloud. We use two methods of detection of public cloud provider from system facts. First method uses some strong signs (e.g. dmi.chassis.asset_tag == '7783-7084-3265-9085-8269-3286-77' is strong sign that machine is running on Azure cloud provider). When detection using strong signs fails, then use some fallback approach and we try to do heuristics detection (we try to find some keywords like Microsoft, Azure, AWS, Amazon, etc.). We get some list of cloud providers from heuristics detection. Then we try to contact metadata servers from this list. This approach is great for automatic detection, but it is too aggressive, when we only try to get facts.

When system is running on VM and Hyper-V hypervisor is used, then false positive detection of Azure could happen as result of heuristics detection and this system tries to reach metadata server. This happens, when system is registered, rhsmcertd tries to gather system facts and 'subscription-manager facts' is executed.


Version-Release number of selected component (if applicable):
[root@localhost ~]# subscription-manager version
server type: Red Hat Subscription Management
subscription management server: 3.2.22-1
subscription management rules: 5.41
subscription-manager: 1.28.21-3.el8

How reproducible:
100%

Steps to Reproduce:
1. Install RHEL8 on VM using Hyper-V or mimic this environment using following custom facts (/etc/rhsm/facts/hyperv.facts)

{
  "dmi.chassis.manufacturer": "microsoft",
  "virt.host_type": "hyperv",
  "virt.is_guest": true
}

2. Set debug environment variables: https://www.candlepinproject.org/docs/subscription-manager/debug_http_traffic.html

3. Run 'subscription-manager facts'

Actual results:

System tries to reach metadata server as you can see here

[root@localhost ~]# subscription-manager facts

Making request: GET http://169.254.169.254/metadata/instance?api-version=2021-02-01 {User-Agent: cloud-what/1.0, Accept-Encoding: gzip, deflate, br, Accept: */*, Connection: keep-alive, Metadata: true}


Making request: GET http://169.254.169.254/metadata/versions {User-Agent: cloud-what/1.0, Accept-Encoding: gzip, deflate, br, Accept: */*, Connection: keep-alive, Metadata: true}

cpu.core(s)_per_socket: 4
cpu.cpu(s): 8
cpu.cpu_socket(s): 1
cpu.thread(s)_per_core: 2
cpu.topology_source: kernel /sys cpu sibling lists
distribution.id: Workstation Edition
distribution.name: Fedora Linux
...


Expected results:
subscription-manager doesn't try to reach metadata server, because there is not strong sign that system is running on cloud provider. Azure cloud provider is detected only by heuristics

Additional info:

Content of rhsm.log

2022-02-22 17:10:29,366 [DEBUG] subscription_manager.py:119690:MainThread @https.py:57 - Using standard libs to provide httplib and ssl
2022-02-22 17:10:29,712 [DEBUG] subscription_manager.py:119690:MainThread @plugins.py:564 - loaded plugin modules: []
2022-02-22 17:10:29,712 [DEBUG] subscription_manager.py:119690:MainThread @plugins.py:565 - loaded plugins: {}
2022-02-22 17:10:29,713 [DEBUG] subscription_manager.py:119690:MainThread @identity.py:135 - Loading consumer info from identity certificates.
2022-02-22 17:10:29,725 [DEBUG] subscription_manager.py:119690:MainThread @cli.py:302 - X-Correlation-ID: 280db92a0fe641b0a0bf28396300cfde
2022-02-22 17:10:29,725 [DEBUG] subscription_manager.py:119690:MainThread @cli.py:191 - Client Versions: {'subscription-manager': 'RPM_VERSION'}
2022-02-22 17:10:29,725 [DEBUG] subscription_manager.py:119690:MainThread @connection.py:170 - Environment variable NO_PROXY= will be used
2022-02-22 17:10:29,725 [DEBUG] subscription_manager.py:119690:MainThread @connection.py:268 - Connection built: host=svice port=8443 handler=/candlepin auth=identity_cert ca_dir=/etc/rhsm/ca/ insecure=True
2022-02-22 17:10:29,725 [DEBUG] subscription_manager.py:119690:MainThread @connection.py:170 - Environment variable NO_PROXY= will be used
2022-02-22 17:10:29,726 [DEBUG] subscription_manager.py:119690:MainThread @connection.py:268 - Connection built: host=svice port=8443 handler=/candlepin auth=none
2022-02-22 17:10:29,731 [DEBUG] subscription_manager.py:119690:MainThread @dmiinfo.py:71 - Using dmidecode dump file: /dev/mem
2022-02-22 17:10:29,738 [WARNING] subscription_manager.py:119690:MainThread @dmiinfo.py:95 - Error reading system DMI information with memory: <built-in function memory> returned a result with an exception set
2022-02-22 17:10:29,739 [WARNING] subscription_manager.py:119690:MainThread @dmiinfo.py:125 - Warnings while reading system DMI information:
# SMBIOS implementations newer than version 2.7 are not
# fully supported by this version of dmidecode.


2022-02-22 17:10:29,823 [DEBUG] subscription_manager.py:119690:MainThread @hwprobe.py:656 - Parsing lscpu JSON: b'{\n   "lscpu": [\n      {\n         "field": "Architecture:",\n         "data": "x86_64"\n      },{\n         "field": "CPU op-mode(s):",\n         "data": "32-bit, 64-bit"\n      },{\n         "field": "Address sizes:",\n         "data": "39 bits physical, 48 bits virtual"\n      },{\n         "field": "Byte Order:",\n         "data": "Little Endian"\n      },{\n         "field": "CPU(s):",\n         "data": "8"\n      },{\n         "field": "On-line CPU(s) list:",\n         "data": "0-7"\n      },{\n         "field": "Vendor ID:",\n         "data": "GenuineIntel"\n      },{\n         "field": "BIOS Vendor ID:",\n         "data": "Intel(R) Corporation"\n      },{\n         "field": "Model name:",\n         "data": "Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz"\n      },{\n         "field": "BIOS Model name:",\n         "data": "Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz"\n      },{\n         "field": "CPU family:",\n         "data": "6"\n      },{\n         "field": "Model:",\n         "data": "142"\n      },{\n         "field": "Thread(s) per core:",\n         "data": "2"\n      },{\n         "field": "Core(s) per socket:",\n         "data": "4"\n      },{\n         "field": "Socket(s):",\n         "data": "1"\n      },{\n         "field": "Stepping:",\n         "data": "10"\n      },{\n         "field": "CPU max MHz:",\n         "data": "4200.0000"\n      },{\n         "field": "CPU min MHz:",\n         "data": "400.0000"\n      },{\n         "field": "BogoMIPS:",\n         "data": "4199.88"\n      },{\n         "field": "Flags:",\n         "data": "fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear flush_l1d arch_capabilities"\n      },{\n         "field": "Virtualization:",\n         "data": "VT-x"\n      },{\n         "field": "L1d cache:",\n         "data": "128 KiB (4 instances)"\n      },{\n         "field": "L1i cache:",\n         "data": "128 KiB (4 instances)"\n      },{\n         "field": "L2 cache:",\n         "data": "1 MiB (4 instances)"\n      },{\n         "field": "L3 cache:",\n         "data": "8 MiB (1 instance)"\n      },{\n         "field": "NUMA node(s):",\n         "data": "1"\n      },{\n         "field": "NUMA node0 CPU(s):",\n         "data": "0-7"\n      },{\n         "field": "Vulnerability Itlb multihit:",\n         "data": "KVM: Mitigation: Split huge pages"\n      },{\n         "field": "Vulnerability L1tf:",\n         "data": "Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable"\n      },{\n         "field": "Vulnerability Mds:",\n         "data": "Mitigation; Clear CPU buffers; SMT vulnerable"\n      },{\n         "field": "Vulnerability Meltdown:",\n         "data": "Mitigation; PTI"\n      },{\n         "field": "Vulnerability Spec store bypass:",\n         "data": "Mitigation; Speculative Store Bypass disabled via prctl"\n      },{\n         "field": "Vulnerability Spectre v1:",\n         "data": "Mitigation; usercopy/swapgs barriers and __user pointer sanitization"\n      },{\n         "field": "Vulnerability Spectre v2:",\n         "data": "Mitigation; Full generic retpoline, IBPB conditional, IBRS_FW, STIBP conditional, RSB filling"\n      },{\n         "field": "Vulnerability Srbds:",\n         "data": "Mitigation; Microcode"\n      },{\n         "field": "Vulnerability Tsx async abort:",\n         "data": "Mitigation; TSX disabled"\n      }\n   ]\n}\n'
2022-02-22 17:10:29,829 [DEBUG] subscription_manager.py:119690:MainThread @custom.py:85 - Loading custom facts from: /etc/rhsm/facts/hyperv.facts
2022-02-22 17:10:29,830 [DEBUG] subscription_manager.py:119690:MainThread @insights.py:63 - Unable to read insights machine_id file: /etc/insights-client/machine-id, error: [Errno 2] No such file or directory: '/etc/insights-client/machine-id'
2022-02-22 17:10:29,830 [DEBUG] subscription_manager.py:119690:MainThread @insights.py:63 - Unable to read insights machine_id file: /etc/redhat-access-insights/machine-id, error: [Errno 2] No such file or directory: '/etc/redhat-access-insights/machine-id'
2022-02-22 17:10:29,830 [DEBUG] subscription_manager.py:119690:MainThread @provider.py:81 - Trying to detect cloud provider
2022-02-22 17:10:29,830 [DEBUG] subscription_manager.py:119690:MainThread @provider.py:99 - No cloud provider detected using strong signs
2022-02-22 17:10:29,831 [DEBUG] subscription_manager.py:119690:MainThread @provider.py:114 - Cloud provider aws has probability: 0.0
2022-02-22 17:10:29,831 [DEBUG] subscription_manager.py:119690:MainThread @provider.py:114 - Cloud provider azure has probability: 0.6
2022-02-22 17:10:29,831 [DEBUG] subscription_manager.py:119690:MainThread @provider.py:114 - Cloud provider gcp has probability: 0.0
2022-02-22 17:10:29,831 [DEBUG] subscription_manager.py:119690:MainThread @provider.py:125 - Following cloud providers detected using heuristics: azure
2022-02-22 17:10:29,831 [DEBUG] subscription_manager.py:119690:MainThread @_base_provider.py:373 - Trying to get metadata from http://169.254.169.254/metadata/instance?api-version=2021-02-01
2022-02-22 17:10:29,833 [DEBUG] subscription_manager.py:119690:MainThread @_base_provider.py:387 - Unable to get azure metadata: HTTPConnectionPool(host='169.254.169.254', port=80): Max retries exceeded with url: /metadata/instance?api-version=2021-02-01 (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f4e55b2bf10>: Failed to establish a new connection: [Errno 111] Connection refused'))
2022-02-22 17:10:29,834 [DEBUG] subscription_manager.py:119690:MainThread @_base_provider.py:373 - Trying to get api_versions from http://169.254.169.254/metadata/versions
2022-02-22 17:10:29,835 [DEBUG] subscription_manager.py:119690:MainThread @_base_provider.py:387 - Unable to get azure api_versions: HTTPConnectionPool(host='169.254.169.254', port=80): Max retries exceeded with url: /metadata/versions (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f4e558a4310>: Failed to establish a new connection: [Errno 111] Connection refused'))
2022-02-22 17:10:29,836 [ERROR] subscription_manager.py:119690:MainThread @azure.py:143 - Unable to decode Azure API versions: the JSON object must be str, bytes or bytearray, not NoneType
2022-02-22 17:10:29,836 [DEBUG] subscription_manager.py:119690:MainThread @provider.py:161 - Unable to get metadata from any cloud provider detected using heuristics
2022-02-22 17:10:29,838 [DEBUG] subscription_manager.py:119690:MainThread @repolib.py:167 - The rhsm.auto_enable_yum_plugins is disabled. Skipping the enablement of yum plugins.