AWS SDK for .NET
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Config
This file contains the profiles.
| ∼/.aws/config |
[default] region = eu-central-1 [profile Profile1] sso_start_url = https://my-sso-portal.awsapps.com/start sso_region = us-west-1 sso_account_id = 111122223333 sso_role_name = SampleRole region = eu-central-1 output = yaml-stream services = local-dynamodb [services local-dynamodb] dynamodb = endpoint_url = http://localhost:8000 |
|
aws sso login --profile Profile1 |
Define the AWS_PROFILE in an env var while starting the project.
| Properties\launchSettings.json |
{
"profiles": {
"MyProfile1": {
"commandName": "Project",
"launchBrowser": true,
"launchUrl": "swagger",
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development",
"AWS_PROFILE": "Profile1"
},
"applicationUrl": "https://localhost:5001;http://localhost:5000"
}
}
|
Credentials
This file contains credentials linked to profiles.
| ∼/.aws/credentials |
[default] aws_access_key_id = ... aws_secret_access_key = ... aws_session_token = ... [Profile1] key = value |
Example .NET applications
|
var ssoCreds = this.LoadSsoCredentials("Profile1");
var token = new AmazonSecurityTokenServiceClient(ssoCreds);
var caller = await token.GetCallerIdentityAsync(new GetCallerIdentityRequest());
this.userId = caller?.UserId.Substring(caller.UserId.IndexOf(":") + 1) ?? string.Empty;
var userNames = await this.GetIamUserNamesAsync(ssoCreds);
var bucketNames = await this.GetS3BucketNames(ssoCreds);
private AWSCredentials LoadSsoCredentials(string profile)
{
var chain = new CredentialProfileStoreChain();
if (!chain.TryGetAWSCredentials(profile, out var credentials))
{
errors.Add($"Failed to find the {profile} profile");
}
// set ClientName and launch a browser window that prompts the SSO user to complete an SSO login
// if the session doesn't already have a valid SSO token.
if (credentials is SSOAWSCredentials ssoCredentials)
{
ssoCredentials.Options.ClientName = "Example-SSO-App";
ssoCredentials.Options.SsoVerificationCallback = args =>
{
Process.Start(new ProcessStartInfo
{
FileName = args.VerificationUriComplete,
UseShellExecute = true
});
};
}
return credentials;
}
private async Task<IReadOnlyCollection<string>> GetIamUserNamesAsync(AWSCredentials ssoCreds)
{
var iamClient = new AmazonIdentityManagementServiceClient(ssoCreds);
var listResponse = await iamClient.ListUsersAsync();
return listResponse.Users.Select(x => x.UserName).ToList();
}
private async Task<IReadOnlyCollection<string>> GetS3BucketNames(AWSCredentials ssoCreds)
{
var s3Client = new AmazonS3Client(ssoCreds);
// Amazon.Runtime.AmazonClientException: 'No RegionEndpoint or ServiceURL configured
// define a default profile in config with a region
var listResponse = await s3Client.ListBucketsAsync();
return listResponse.Buckets.Select(x => x.BucketName).ToList();
}
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Install the following nuget packages: AWSSDK.Core AWSSDK.SecurityToken AWSSDK.SSO AWSSDK.SSOOIDC
For IAM users: AWSSDK.IdentityManagement
For S3 buckets: AWSSDK.S3
Secrets Manager
Cognito
| Program.cs |
builder.Services.AddCognitoIdentity();
builder.Services.AddAuthentication(options =>
{
options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddJwtBearer(options =>
{
options.Authority = builder.Configuration["AWSCognito:Authority"];
options.Audience = builder.Configuration["AWSCognito:UserPoolClientId"];
options.TokenValidationParameters = new TokenValidationParameters
{
ValidateIssuerSigningKey = true,
ValidateAudience = true
};
options.TokenValidationParameters.AudienceValidator = (audiences, securityToken, validationParameters) =>
{
// Cognito tokens doesn't have "aud" claim. Instead the audience is set in "client_id"
var jsonWebToken = (Microsoft.IdentityModel.JsonWebTokens.JsonWebToken)securityToken;
if (!jsonWebToken.Claims.Any(f => f.Type == "aud"))
return false;
return validationParameters.ValidAudience.Contains(jsonWebToken.Claims.First(f => f.Type == "aud").Value);
};
});
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