Mercurial > hg > orthanc-book
annotate Sphinx/source/plugins/object-storage.rst @ 500:4481882d9c83
typo
| author | Alain Mazy <alain@mazy.be> |
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| date | Tue, 01 Sep 2020 18:22:01 +0200 |
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| 451 | 1 .. _object-storage: |
| 2 | |
| 3 | |
| 4 Cloud Object Storage plugins | |
| 5 ============================ | |
| 6 | |
| 7 .. contents:: | |
| 8 | |
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9 Release notes |
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10 ------------- |
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11 |
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12 Release notes are available `here |
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13 <https://hg.orthanc-server.com/orthanc-object-storage/file/default/NEWS>`__ |
| 451 | 14 |
| 15 Introduction | |
| 16 ------------ | |
| 17 | |
| 18 Osimis freely provides the `source code | |
| 19 <https://hg.orthanc-server.com/orthanc-object-storage/file/default/>`__ of 3 plugins | |
| 20 to store the Orthanc files in `Object Storage <https://en.wikipedia.org/wiki/Object_storage>`__ | |
| 21 at the 3 main providers: `AWS <https://aws.amazon.com/s3/>`__, | |
| 22 `Azure <https://azure.microsoft.com/en-us/services/storage/blobs/>`__ & | |
| 23 `Google Cloud <https://cloud.google.com/storage>`__ | |
| 24 | |
| 25 Storing Orthanc files in object storage and your index SQL in a | |
| 26 managed database allows you to have a stateless Orthanc that does | |
| 27 not store any data in its local file system which is highly recommended | |
| 28 when deploying an application in the cloud. | |
| 29 | |
| 30 | |
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31 Pre-compiled binaries |
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32 --------------------- |
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33 |
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34 These plugins are used to interface Orthanc with commercial and |
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35 proprietary cloud services that you accept to pay. As a consequence, |
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36 the Orthanc project doesn't freely provide pre-compiled binaries for |
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37 Docker, Windows, Linux or OS X. These pre-compiled binaries do exist, |
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38 but are reserved to the companies who have subscribed to a |
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39 `professional support contract |
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40 <https://www.osimis.io/en/services.html#cloud-plugins>`__ by |
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41 Osimis. Although you are obviously free to compile these plugins by |
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42 yourself (instructions are given below), purchasing such support |
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43 contracts makes the Orthanc project sustainable in the long term, to |
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44 the benefit of the worldwide community of medical imaging. |
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45 |
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46 |
| 451 | 47 Compilation |
| 48 ----------- | |
| 49 | |
| 50 .. highlight:: text | |
| 51 | |
| 52 The procedure to compile the plugins is quite similar of that for the | |
| 53 :ref:`core of Orthanc <compiling>` although they usually require | |
| 54 some prerequisites. The documented procedure has been tested only | |
| 55 on a Debian Buster machine. | |
| 56 | |
| 57 The compilation of each plugin produces a shared library that contains | |
| 58 the plugin. | |
| 59 | |
| 60 | |
| 61 AWS S3 plugin | |
| 62 ^^^^^^^^^^^^^ | |
| 63 | |
| 64 Prerequisites: Compile the AWS C++ SDK:: | |
| 65 | |
| 66 $ mkdir ~/aws | |
| 67 $ cd ~/aws | |
| 68 $ git clone https://github.com/aws/aws-sdk-cpp.git | |
| 69 $ | |
| 70 $ mkdir -p ~/aws/builds/aws-sdk-cpp | |
| 71 $ cd ~/aws/builds/aws-sdk-cpp | |
| 72 $ cmake -DBUILD_ONLY="s3;transfer" ~/aws/aws-sdk-cpp | |
| 73 $ make -j 4 | |
| 74 $ make install | |
| 75 | |
| 76 Prerequisites: Install `vcpkg <https://github.com/Microsoft/vcpkg>`__ dependencies:: | |
| 77 | |
| 78 $ ./vcpkg install cryptopp | |
| 79 | |
| 80 Compile:: | |
| 81 | |
| 82 $ mkdir -p build/aws | |
| 83 $ cd build/aws | |
| 84 $ cmake -DCMAKE_TOOLCHAIN_FILE=[vcpkg root]\scripts\buildsystems\vcpkg.cmake ../../orthanc-object-storage/Aws | |
| 85 | |
| 86 Azure Blob Storage plugin | |
| 87 ^^^^^^^^^^^^^^^^^^^^^^^^^ | |
| 88 | |
| 89 Prerequisites: Install `vcpkg <https://github.com/Microsoft/vcpkg>`__ dependencies:: | |
| 90 | |
| 91 $ ./vcpkg install cpprestsdk | |
| 92 | |
| 93 | |
| 94 Compile:: | |
| 95 | |
| 96 $ mkdir -p build/azure | |
| 97 $ cd build/azure | |
| 98 $ cmake -DCMAKE_TOOLCHAIN_FILE=[vcpkg root]\scripts\buildsystems\vcpkg.cmake ../../orthanc-object-storage/Azure | |
| 99 | |
| 100 Google Storage plugin | |
| 101 ^^^^^^^^^^^^^^^^^^^^^ | |
| 102 | |
| 103 Prerequisites: Install `vcpkg <https://github.com/Microsoft/vcpkg>`__ dependencies:: | |
| 104 | |
| 105 $ ./vcpkg install google-cloud-cpp | |
| 106 $ ./vcpkg install cryptopp | |
| 107 | |
| 108 Compile:: | |
| 109 | |
| 110 $ mkdir -p build/google | |
| 111 $ cd build/google | |
| 112 $ cmake -DCMAKE_TOOLCHAIN_FILE=[vcpkg root]\scripts\buildsystems\vcpkg.cmake ../../orthanc-object-storage/google | |
| 113 | |
| 114 | |
| 115 Configuration | |
| 116 ------------- | |
| 117 | |
| 118 .. highlight:: json | |
| 119 | |
| 120 AWS S3 plugin | |
| 121 ^^^^^^^^^^^^^ | |
| 122 | |
| 123 Sample configuration:: | |
| 124 | |
| 125 "AwsS3Storage" : { | |
| 126 "BucketName": "test-orthanc-s3-plugin", | |
| 127 "Region" : "eu-central-1", | |
| 128 "AccessKey" : "AKXXX", | |
| 463 | 129 "SecretKey" : "RhYYYY", |
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130 "Endpoint": "", // custom endpoint |
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131 "ConnectionTimeout": 30, // connection timeout in seconds |
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132 "RequestTimeout": 1200, // request timeout in seconds (max time to upload/download a file) |
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133 "MigrationFromFileSystemEnabled": false, // see below |
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134 "StorageStructure": "flat" // see below |
| 451 | 135 } |
| 136 | |
| 464 | 137 The **EndPoint** configuration is used when accessing an S3 compatible cloud provider. I.e. here is a configuration to store data on Scaleway:: |
| 138 | |
| 139 "AwsS3Storage" : { | |
| 140 "BucketName": "test-orthanc", | |
| 141 "Region": "fr-par", | |
| 142 "AccessKey": "XXX", | |
| 143 "SecretKey": "YYY", | |
| 144 "Endpoint": "s3.fr-par.scw.cloud" | |
| 145 }, | |
| 146 | |
| 451 | 147 Azure Blob Storage plugin |
| 148 ^^^^^^^^^^^^^^^^^^^^^^^^^ | |
| 149 | |
| 150 Sample configuration:: | |
| 151 | |
| 152 "AzureBlobStorage" : { | |
| 153 "ConnectionString": "DefaultEndpointsProtocol=https;AccountName=xxxxxxxxx;AccountKey=yyyyyyyy===;EndpointSuffix=core.windows.net", | |
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154 "ContainerName" : "test-orthanc-storage-plugin", |
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155 "MigrationFromFileSystemEnabled": false, // see below |
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156 "StorageStructure": "flat" // see below |
| 451 | 157 } |
| 158 | |
| 159 | |
| 160 Google Storage plugin | |
| 161 ^^^^^^^^^^^^^^^^^^^^^ | |
| 162 | |
| 163 Sample configuration:: | |
| 164 | |
| 165 "GoogleCloudStorage" : { | |
| 166 "ServiceAccountFile": "/path/to/googleServiceAccountFile.json", | |
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167 "BucketName": "test-orthanc-storage-plugin", |
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168 "MigrationFromFileSystemEnabled": false, // see below |
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169 "StorageStructure": "flat" // see below |
| 451 | 170 } |
| 171 | |
| 172 | |
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173 Migration & Storage structure |
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174 ----------------------------- |
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175 |
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176 The **StorageStructure** configuration allows you to select the way objects are organized |
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177 within the storage (``flat`` or ``legacy``). |
| 500 | 178 Unlike the traditional file system in which Orthanc uses 2 levels |
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179 of folders, object storages usually have no limit on the number of files per folder and |
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180 therefore all objects are stored at the root level of the object storage. This is the |
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181 default ``flat`` behaviour. Note that, in the ``flat`` mode, an extension `.dcm` or `.json` |
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182 is added to the filename which is not the case in the legacy mode. |
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183 |
| 500 | 184 The ``legacy`` behaviour mimics the Orthanc File System convention. This is actually helpful |
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185 when migrating your data from a file system to an object storage since you can copy all the file |
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186 hierarchy as is. |
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187 |
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188 Note that you can not change this configuration once you've uploaded the first files in Orthanc. |
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189 |
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190 The **MigrationFromFileSystemEnabled** configuration has been for Orthanc to continue working |
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191 while you're migrating your data from the file system to the object storage. While this option is enabled, |
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192 Orthanc will store all new files into the object storage but will try to read/delete files |
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193 from both the file system and the object storage. |
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194 |
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195 This option can be disabled as soon as all files have been copied from the file system to the |
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196 object storage. Note that Orthanc is not copying the files from one storage to the other; you'll |
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197 have to use a standard ``sync`` command from the object-storage provider. |
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198 |
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199 |
| 452 | 200 Sample setups |
| 201 ------------- | |
| 202 | |
| 203 You'll find sample deployments and more info in the `Orthanc Setup Samples repository <https://bitbucket.org/osimis/orthanc-setup-samples/src/master/#markdown-header-for-osimisorthanc-pro-image-users>`__ . | |
| 204 | |
| 205 | |
| 451 | 206 Client-side encryption |
| 207 ---------------------- | |
| 208 | |
| 209 Although all cloud providers already provide encryption at rest, the plugins provide | |
| 210 an optional layer of client-side encryption . It is very important that you understand | |
| 211 the scope and benefits of this additional layer of encryption. | |
| 212 | |
| 213 Rationale | |
| 214 ^^^^^^^^^ | |
| 215 | |
| 216 Encryption at rest provided by cloud providers basically compares with a file-system disk encryption. | |
| 217 If someone has access to the disk, he won't have access to your data without the encryption key. | |
| 218 | |
| 219 With cloud encryption at rest only, if someone has access to the "api-key" of your storage or if one | |
| 220 of your admin inadvertently make your storage public, `PHI <https://en.wikipedia.org/wiki/Protected_health_information>`__ will leak. | |
| 221 | |
| 222 Once you use client-side encryption, you'll basically store packets of meaningless bytes on the cloud infrastructure. | |
| 223 So, if an "api-key" leaks or if the storage is misconfigured, packets of bytes will leak but not PHI since | |
| 224 no one will be able to decrypt them. | |
| 225 | |
| 226 Another advantage is that these packets of bytes might eventually not be considered as PHI anymore and eventually | |
| 227 help you meet your local regulations (Please check your local regulations). | |
| 228 | |
| 229 However, note that, if you're running entirely in a cloud environment, your decryption keys will still | |
| 230 be stored on the cloud infrastructure (VM disks - process RAM) and an attacker could still eventually gain access to this keys. | |
| 231 | |
| 232 If Orthanc is running in your infrastructure with the Index DB on your infrastructure, and files are store in the cloud, | |
| 233 the master keys will remain on your infrastructure only and there's no way the data stored in the cloud could be decrypted outside your infrastructure. | |
| 234 | |
| 235 Also note that, although the cloud providers also provide client-side encryption, we, as an open-source project, | |
| 236 wanted to provide our own implementation on which you'll have full control and extension capabilities. | |
| 237 This also allows us to implement the same logic on all cloud providers. | |
| 238 | |
| 239 Our encryption is based on well-known standards (see below). Since it is documented and the source code is open-source, | |
| 240 feel-free to have your security expert review it before using it in a production environment. | |
| 241 | |
| 242 Technical details | |
| 243 ^^^^^^^^^^^^^^^^^ | |
| 244 | |
| 245 Orthanc saves 2 kind of files: DICOM files and JSON summaries of DICOM files. Both files contain PHI. | |
| 246 | |
| 452 | 247 When configuring the plugin, you'll have to provide a **Master Key** that we can also call the **Key Encryption Key (KEK)**. |
| 451 | 248 |
| 452 | 249 For each file being saved, the plugin will generate a new **Data Encryption Key (DEK)**. This DEK, encrypted with the KEK will be pre-pended to the file. |
| 451 | 250 |
| 251 If, at any point, your KEK leaks or you want to rotate your KEKs, you'll be able to use a new one to encrypt new files that are being added | |
| 252 and still use the old ones to decrypt data. You could then eventually start a side script to remove usages of the leaked/obsolete KEKs. | |
| 253 | |
| 254 To summarize: | |
| 255 | |
| 452 | 256 - We use `Crypto++ <https://www.cryptopp.com/>`__ to perform all encryptions. |
| 451 | 257 - All keys (KEK and DEK) are AES-256 keys. |
| 258 - DEKs and IVs are encrypted by KEK using CTR block cipher using a null IV. | |
| 259 - data is encrypted by DEK using GCM block cipher that will also perform integrity check on the whole file. | |
| 260 | |
| 261 The format of data stored on disk is therefore the following: | |
| 262 | |
| 263 - **VERSION HEADER**: 2 bytes: identify the structure of the following data currently `A1` | |
| 264 - **MASTER KEY ID**: 4 bytes: a numerical ID of the KEK that was used to encrypt the DEK | |
| 265 - **EIV**: 32 bytes: IV used by DEK for data encryption; encrypted by KEK | |
| 266 - **EDEK**: 32 bytes: the DEK encrypted by the KEK. | |
| 267 - **CIPHER TEXT**: variable length: the DICOM/JSON file encrypted by the DEK | |
| 268 - **TAG**: 16 bytes: integrity check performed on the whole encrypted file (including header, master key id, EIV and EDEK) | |
| 269 | |
| 270 Configuration | |
| 271 ^^^^^^^^^^^^^ | |
| 272 | |
| 273 .. highlight:: text | |
| 274 | |
| 275 AES Keys shall be 32 bytes long (256 bits) and encoded in base64. Here's a sample OpenSSL command to generate such a key:: | |
| 276 | |
| 277 openssl rand -base64 -out /tmp/test.key 32 | |
| 278 | |
| 279 Each key must have a unique id that is a uint32 number. | |
| 280 | |
| 281 .. highlight:: json | |
| 282 | |
| 283 Here's a sample configuration file of the `StorageEncryption` section of the plugins:: | |
| 284 | |
| 285 { | |
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286 "GoogleCloudStorage" : { |
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287 "StorageEncryption" : { |
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288 "Enable": true, |
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289 "MasterKey": [3, "/path/to/master.key"], // key id - path to the base64 encoded key |
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290 "PreviousMasterKeys" : [ |
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291 [1, "/path/to/previous1.key"], |
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292 [2, "/path/to/previous2.key"] |
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293 ], |
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parents:
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294 "MaxConcurrentInputSize" : 1024 // size in MB |
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parents:
464
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295 } |
| 451 | 296 } |
| 297 } | |
| 298 | |
| 299 **MaxConcurrentInputSize**: Since the memory used during encryption/decryption can grow up to a bit more | |
| 300 than 2 times the input, we want to limit the number of threads doing concurrent processing according | |
| 301 to the available memory instead of the number of concurrent threads. Therefore, if you're currently | |
| 302 ingesting small files, you can have a lot of thread working together while, if you're ingesting large | |
| 303 files, threads might have to wait before receiving a "slot" to access the encryption module. |