Usar PutBucketLogging com o AWS SDK ou a CLI

    using System;
    using System.IO;
    using System.Threading.Tasks;
    using Amazon.S3;
    using Amazon.S3.Model;
    using Microsoft.Extensions.Configuration;

    /// <summary>
    /// This example shows how to enable logging on an Amazon Simple Storage
    /// Service (Amazon S3) bucket. You need to have two Amazon S3 buckets for
    /// this example. The first is the bucket for which you wish to enable
    /// logging, and the second is the location where you want to store the
    /// logs.
    /// </summary>
    public class ServerAccessLogging
    {
        private static IConfiguration _configuration = null!;

        public static async Task Main()
        {
            LoadConfig();

            string bucketName = _configuration["BucketName"];
            string logBucketName = _configuration["LogBucketName"];
            string logObjectKeyPrefix = _configuration["LogObjectKeyPrefix"];
            string accountId = _configuration["AccountId"];

            // If the AWS Region defined for your default user is different
            // from the Region where your Amazon S3 bucket is located,
            // pass the Region name to the Amazon S3 client object's constructor.
            // For example: RegionEndpoint.USWest2 or RegionEndpoint.USEast2.
            IAmazonS3 client = new AmazonS3Client();

            try
            {
                // Update bucket policy for target bucket to allow delivery of logs to it.
                await SetBucketPolicyToAllowLogDelivery(
                    client,
                    bucketName,
                    logBucketName,
                    logObjectKeyPrefix,
                    accountId);

                // Enable logging on the source bucket.
                await EnableLoggingAsync(
                    client,
                    bucketName,
                    logBucketName,
                    logObjectKeyPrefix);
            }
            catch (AmazonS3Exception e)
            {
                Console.WriteLine($"Error: {e.Message}");
            }
        }

        /// <summary>
        /// This method grants appropriate permissions for logging to the
        /// Amazon S3 bucket where the logs will be stored.
        /// </summary>
        /// <param name="client">The initialized Amazon S3 client which will be used
        /// to apply the bucket policy.</param>
        /// <param name="sourceBucketName">The name of the source bucket.</param>
        /// <param name="logBucketName">The name of the bucket where logging
        /// information will be stored.</param>
        /// <param name="logPrefix">The logging prefix where the logs should be delivered.</param>
        /// <param name="accountId">The account id of the account where the source bucket exists.</param>
        /// <returns>Async task.</returns>
        public static async Task SetBucketPolicyToAllowLogDelivery(
            IAmazonS3 client,
            string sourceBucketName,
            string logBucketName,
            string logPrefix,
            string accountId)
        {
            var resourceArn = @"""arn:aws:s3:::" + logBucketName + "/" + logPrefix + @"*""";

            var newPolicy = @"{
                                ""Statement"":[{
                                ""Sid"": ""S3ServerAccessLogsPolicy"",
                                ""Effect"": ""Allow"",
                                ""Principal"": { ""Service"": ""logging.s3.amazonaws.com"" },
                                ""Action"": [""s3:PutObject""],
                                ""Resource"": [" + resourceArn + @"],
                                ""Condition"": {
                                ""ArnLike"": { ""aws:SourceArn"": ""arn:aws:s3:::" + sourceBucketName + @""" },
                                ""StringEquals"": { ""aws:SourceAccount"": """ + accountId + @""" }
                                        }
                                    }]
                                }";
            Console.WriteLine($"The policy to apply to bucket {logBucketName} to enable logging:");
            Console.WriteLine(newPolicy);

            PutBucketPolicyRequest putRequest = new PutBucketPolicyRequest
            {
                BucketName = logBucketName,
                Policy = newPolicy,
            };
            await client.PutBucketPolicyAsync(putRequest);
            Console.WriteLine("Policy applied.");
        }

        /// <summary>
        /// This method enables logging for an Amazon S3 bucket. Logs will be stored
        /// in the bucket you selected for logging. Selected prefix
        /// will be prepended to each log object.
        /// </summary>
        /// <param name="client">The initialized Amazon S3 client which will be used
        /// to configure and apply logging to the selected Amazon S3 bucket.</param>
        /// <param name="bucketName">The name of the Amazon S3 bucket for which you
        /// wish to enable logging.</param>
        /// <param name="logBucketName">The name of the Amazon S3 bucket where logging
        /// information will be stored.</param>
        /// <param name="logObjectKeyPrefix">The prefix to prepend to each
        /// object key.</param>
        /// <returns>Async task.</returns>
        public static async Task EnableLoggingAsync(
            IAmazonS3 client,
            string bucketName,
            string logBucketName,
            string logObjectKeyPrefix)
        {
            Console.WriteLine($"Enabling logging for bucket {bucketName}.");
            var loggingConfig = new S3BucketLoggingConfig
            {
                TargetBucketName = logBucketName,
                TargetPrefix = logObjectKeyPrefix,
            };

            var putBucketLoggingRequest = new PutBucketLoggingRequest
            {
                BucketName = bucketName,
                LoggingConfig = loggingConfig,
            };
            await client.PutBucketLoggingAsync(putBucketLoggingRequest);
            Console.WriteLine($"Logging enabled.");
        }

        /// <summary>
        /// Loads configuration from settings files.
        /// </summary>
        public static void LoadConfig()
        {
            _configuration = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("settings.json") // Load settings from .json file.
                .AddJsonFile("settings.local.json", true) // Optionally, load local settings.
                .Build();
        }
    }

Exemplo 1: definir o registro em log da política de bucket

O exemplo de put-bucket-logging a seguir define a política de registro em log para MyBucket. Primeiro, conceda permissão à entidade principal do serviço de registro em log na política de bucket usando o comando put-bucket-policy.

aws s3api put-bucket-policy \
    --bucket MyBucket \
    --policy file://policy.json

Conteúdo de policy.json:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "S3ServerAccessLogsPolicy",
            "Effect": "Allow",
            "Principal": {"Service": "logging.s3.amazonaws.com"},
            "Action": "s3:PutObject",
            "Resource": "arn:aws:s3:::MyBucket/Logs/*",
            "Condition": {
                "ArnLike": {"aws:SourceARN": "arn:aws:s3:::SOURCE-BUCKET-NAME"},
                "StringEquals": {"aws:SourceAccount": "SOURCE-AWS-ACCOUNT-ID"}
            }
        }
    ]
}

Para aplicar a política de registro em log, use put-bucket-logging.

aws s3api put-bucket-logging \
    --bucket MyBucket \
    --bucket-logging-status file://logging.json

Conteúdo de logging.json:

{
     "LoggingEnabled": {
         "TargetBucket": "MyBucket",
         "TargetPrefix": "Logs/"
     }
 }

O comando put-bucket-policy é necessário para conceder as permissões s3:PutObject à entidade principal do serviço de registro em log.

Consulte mais informações em Registrar em log as solicitações com registro em log de acesso ao servidor no Guia do usuário do Amazon S3.

Exemplo 2: definir uma política de bucket para registrar em log o acesso a um único usuário

O exemplo de put-bucket-logging a seguir define a política de registro em log para MyBucket. O usuário bob@exemplo.com da AWS terá controle total sobre os arquivos de log e ninguém mais terá acesso. Primeiro, conceda permissão ao S3 com put-bucket-acl.

aws s3api put-bucket-acl \
    --bucket MyBucket \
    --grant-write URI=http://acs.amazonaws.com/groups/s3/LogDelivery \
    --grant-read-acp URI=http://acs.amazonaws.com/groups/s3/LogDelivery

Depois, aplique a política de registro em log usando put-bucket-logging.

aws s3api put-bucket-logging \
    --bucket MyBucket \
    --bucket-logging-status file://logging.json

Conteúdo de logging.json:

{
    "LoggingEnabled": {
        "TargetBucket": "MyBucket",
        "TargetPrefix": "MyBucketLogs/",
        "TargetGrants": [
            {
                "Grantee": {
                    "Type": "AmazonCustomerByEmail",
                    "EmailAddress": "bob@example.com"
                },
                "Permission": "FULL_CONTROL"
            }
        ]
    }
}

O comando put-bucket-acl é necessário para conceder as permissões necessárias ao sistema de entrega de log do S3 (permissões de gravação e read-acp).

Consulte mais informações em Habilitar o log de acesso ao servidor do Amazon S3 no Guia do desenvolvedor do Amazon S3.