README
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nss_awsiam_go
This is a glibc NSS (name server switch) module, which does the query against AWS IAM user and group registry.
Building
$ make
will produce libnss_awsiam_go.so in the current working directory. You can put it under /lib/x86_64-linux-gnu (may vary by the configuration of your OS) as libnss_awsiam_go.so.2 to get it to work.
Configuration
Configuration is done through the configuration variable file (/etc/nss_awsiam_go.conf).
For security reasons, this module doesn't accept shared configuration and credentials under ~/.aws.
Configuration variables
Authorization
In addition to the default AWS SDK configuration scheme, it supports STS credentials for a assumed role through the following environment variables:
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AWS_STS_ASSUME_ROLE_ARNThis specifies the ARN for the assumed (target) IAM role. The difference from
AWS_ROLE_ARNis that this can be used in nested STS contexts.
Querying
You can configure the querying behavior by the following special environment variable:
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NSS_AWSIAM_GO_TIMEOUTSpecifies the timeout value of the query. Defaults to 3 seconds.
Debugging
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NSS_AWSIAM_GO_DEBUGTakes an integer value. 1 to enable error reporting, and 2 to enable AWS API request debugging.
Miscellaneous
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NSS_AWSIAM_GO_DEFAULT_SHELLSpecify the default shell for all users.
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NSS_AWSIAM_GO_HOMEDIR_TEMPLATESpecify the home directory template applied for all users. You can use the placeholder
{userName},{userId}, or{uid}everywhere in the template.
Note on SIGURG usage in Go runtime
Since Go 1.14, it started to use SIGURG to do the non-cooperative preemption. This may be troublesome because the hosting application will also receive the signal. This module should work without preemption. To prevent the preemption, specify GODEBUG=asyncpreemptoff=1.
License
MIT License
Documentation
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Overview ¶
Copyright (c) 2020 Moriyoshi Koizumi
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Copyright (c) 2020 Moriyoshi Koizumi ¶
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Source Files
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