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{Logging} Redact token headers from SDK HTTP log #17671

Merged
merged 3 commits into from
Apr 22, 2021
Merged

{Logging} Redact token headers from SDK HTTP log #17671

merged 3 commits into from
Apr 22, 2021

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jiasli
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@jiasli jiasli commented Apr 13, 2021 •
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Resolve #17625

Context

  1. Starting from azure-core 1.13.0, Authorization header is now exposed in DEBUG log (Make NetworkTraceLoggingPolicy show the auth token in plain text azure-sdk-for-python#17424).
  2. Python SDK decided not to redact x-ms-authorization-auxiliary header (x-ms-authorization-auxiliary header should be redacted azure-sdk-for-python#17271).

Changes

Create a custom policy SafeNetworkTraceLoggingPolicy to replace NetworkTraceLoggingPolicy. It by default redacts Authorization and x-ms-authorization-auxiliary. Any client factory calling prepare_client_kwargs_track2 will have this policy configured.

Testing Guide

Any Track 2 mgmt-plane command, like

> az storage account list

cli.azure.cli.core.sdk.policies: Request URL: 'https://management.azure.com/subscriptions/414af076-009b-4282-9a0a-acf75bcb037e/providers/Microsoft.Storage/storageAccounts?api-version=2021-01-01'
cli.azure.cli.core.sdk.policies: Request method: 'GET'
cli.azure.cli.core.sdk.policies: Request headers:
cli.azure.cli.core.sdk.policies:     'Authorization': '*****'

# Cross tenant auth with x-ms-authorization-auxiliary
> az network vnet peering create --name myVnetAToMyVnetB --resource-group myResourceGroupA --vnet-name myVnetA --remote-vnet /subscriptions/0b1f6471-1bf0-4dda-aec3-cb9272f09590/resourceGroups/myResourceGroupB/providers/Microsoft.Network/VirtualNetworks/myVnetB --allow-vnet-access --debug

cli.azure.cli.core.sdk.policies: Request URL: 'https://management.azure.com/subscriptions/414af076-009b-4282-9a0a-acf75bcb037e/resourceGroups/myResourceGroupA/providers/Microsoft.Network/virtualNetworks/myVnetA/virtualNetworkPeerings/myVnetAToMyVnetB?api-version=2020-11-01'
cli.azure.cli.core.sdk.policies: Request method: 'PUT'
cli.azure.cli.core.sdk.policies: Request headers:
cli.azure.cli.core.sdk.policies:     'x-ms-authorization-auxiliary': '*****'
cli.azure.cli.core.sdk.policies:     'Authorization': '*****'

@yonzhan yonzhan requested a review from Juliehzl April 13, 2021 11:30
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yonzhan commented Apr 13, 2021

Logging

@yonzhan yonzhan added this to the S186 milestone Apr 13, 2021
@jiasli jiasli marked this pull request as ready for review April 14, 2021 09:30
@jiasli jiasli requested a review from houk-ms as a code owner April 14, 2021 09:30
houk-ms
houk-ms approved these changes Apr 15, 2021
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LGTM

houk-ms
houk-ms reviewed Apr 15, 2021
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src/azure-cli-core/azure/cli/core/commands/client_factory.py
*_, external_tenant_tokens = cred.get_all_tokens(*scopes)
# Hard-code scheme to 'Bearer' as _BearerTokenCredentialPolicyBase._update_headers does.
client_kwargs['headers']['x-ms-authorization-auxiliary'] = \
', '.join("Bearer {}".format(t[1]) for t in external_tenant_tokens)
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Just curious, always Bearer token here?

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Yes. The comment at L182 explains that:

azure-cli/src/azure-cli-core/azure/cli/core/commands/client_factory.py

Line 182 in 36e3d15

# Hard-code scheme to 'Bearer' as _BearerTokenCredentialPolicyBase._update_headers does.

jsntcy
jsntcy approved these changes Apr 19, 2021
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:shipit:

@jiasli jiasli mentioned this pull request Apr 22, 2021
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Juliehzl
Juliehzl reviewed Apr 22, 2021
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src/azure-cli-core/azure/cli/core/sdk/policies.py
Comment on lines +51 to +57
if isinstance(http_request.body, types.GeneratorType):
_LOGGER.debug("File upload")
return
try:
if isinstance(http_request.body, types.AsyncGeneratorType):
_LOGGER.debug("File upload")
return
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In storage track1 data plane SDK, for such file, it will logging with file size. Could we also support it here?

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This SafeNetworkTraceLoggingPolicy is designed as a generic policy. That's why I am hesitating to apply it to all SDKs (including data-plane SDKs) at the beginning.

If storage data-plane SDK or other data-plane SDKs requires additional/special logic, we may apply SafeNetworkTraceLoggingPolicy only to ARM and let data-plane SDKs decide what policy they want.

Another solution is to define your own policy and override

azure-cli/src/azure-cli-core/azure/cli/core/commands/client_factory.py

Lines 155 to 156 in 36e3d15

from azure.cli.core.sdk.policies import SafeNetworkTraceLoggingPolicy
client_kwargs['logging_policy'] = SafeNetworkTraceLoggingPolicy()

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We could keep current design then.

@jiasli jiasli merged commit 6728379 into Azure:dev Apr 22, 2021
@jiasli jiasli deleted the logging branch April 22, 2021 05:43
@jiasli jiasli mentioned this pull request Apr 22, 2021
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@jiasli jiasli changed the title {Logging} Redact headers from SDK HTTP log {Logging} Redact token headers from SDK HTTP log Apr 22, 2021
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@houk-ms houk-ms houk-ms approved these changes

@jsntcy jsntcy jsntcy approved these changes

@zhoxing-ms zhoxing-ms zhoxing-ms approved these changes

@Juliehzl Juliehzl Juliehzl approved these changes

@evelyn-ys evelyn-ys Awaiting requested review from evelyn-ys evelyn-ys is a code owner

@fengzhou-msft fengzhou-msft Awaiting requested review from fengzhou-msft

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Redact tokens from --debug log
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@jiasli @yonzhan @jsntcy @zhoxing-ms @Juliehzl @houk-ms