-
Notifications
You must be signed in to change notification settings - Fork 2.1k
/
shared_client.go
217 lines (184 loc) · 5.77 KB
/
shared_client.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
package s3crypto
import (
"encoding/base64"
"encoding/hex"
"io"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/internal/sdkio"
"github.com/aws/aws-sdk-go/service/s3"
)
// clientConstructionErrorCode is used for operations that can't be completed due to invalid client construction
const clientConstructionErrorCode = "ClientConstructionError"
// mismatchWrapError is an error returned if a wrapping handler receives an unexpected envelope
var mismatchWrapError = awserr.New(clientConstructionErrorCode, "wrap algorithm provided did not match handler", nil)
func putObjectRequest(c EncryptionClientOptions, input *s3.PutObjectInput) (*request.Request, *s3.PutObjectOutput) {
req, out := c.S3Client.PutObjectRequest(input)
// Get Size of file
n, err := aws.SeekerLen(input.Body)
if err != nil {
req.Error = err
return req, out
}
dst, err := getWriterStore(req, c.TempFolderPath, n >= c.MinFileSize)
if err != nil {
req.Error = err
return req, out
}
req.Handlers.Build.PushFront(func(r *request.Request) {
if err != nil {
r.Error = err
return
}
var encryptor ContentCipher
if v, ok := c.ContentCipherBuilder.(ContentCipherBuilderWithContext); ok {
encryptor, err = v.ContentCipherWithContext(r.Context())
} else {
encryptor, err = c.ContentCipherBuilder.ContentCipher()
}
if err != nil {
r.Error = err
return
}
lengthReader := newContentLengthReader(input.Body)
sha := newSHA256Writer(dst)
reader, err := encryptor.EncryptContents(lengthReader)
if err != nil {
r.Error = err
return
}
_, err = io.Copy(sha, reader)
if err != nil {
r.Error = err
return
}
data := encryptor.GetCipherData()
env, err := encodeMeta(lengthReader, data)
if err != nil {
r.Error = err
return
}
shaHex := hex.EncodeToString(sha.GetValue())
req.HTTPRequest.Header.Set("X-Amz-Content-Sha256", shaHex)
dst.Seek(0, sdkio.SeekStart)
input.Body = dst
err = c.SaveStrategy.Save(env, r)
r.Error = err
})
return req, out
}
func putObject(options EncryptionClientOptions, input *s3.PutObjectInput) (*s3.PutObjectOutput, error) {
req, out := putObjectRequest(options, input)
return out, req.Send()
}
func putObjectWithContext(options EncryptionClientOptions, ctx aws.Context, input *s3.PutObjectInput, opts ...request.Option) (*s3.PutObjectOutput, error) {
req, out := putObjectRequest(options, input)
req.SetContext(ctx)
req.ApplyOptions(opts...)
return out, req.Send()
}
func getObjectRequest(options DecryptionClientOptions, input *s3.GetObjectInput) (*request.Request, *s3.GetObjectOutput) {
req, out := options.S3Client.GetObjectRequest(input)
req.Handlers.Unmarshal.PushBack(func(r *request.Request) {
env, err := options.LoadStrategy.Load(r)
if err != nil {
r.Error = err
out.Body.Close()
return
}
// If KMS should return the correct cek algorithm with the proper
// KMS key provider
cipher, err := contentCipherFromEnvelope(options, r.Context(), env)
if err != nil {
r.Error = err
out.Body.Close()
return
}
reader, err := cipher.DecryptContents(out.Body)
if err != nil {
r.Error = err
out.Body.Close()
return
}
out.Body = reader
})
return req, out
}
func getObject(options DecryptionClientOptions, input *s3.GetObjectInput) (*s3.GetObjectOutput, error) {
req, out := getObjectRequest(options, input)
return out, req.Send()
}
func getObjectWithContext(options DecryptionClientOptions, ctx aws.Context, input *s3.GetObjectInput, opts ...request.Option) (*s3.GetObjectOutput, error) {
req, out := getObjectRequest(options, input)
req.SetContext(ctx)
req.ApplyOptions(opts...)
return out, req.Send()
}
func contentCipherFromEnvelope(options DecryptionClientOptions, ctx aws.Context, env Envelope) (ContentCipher, error) {
wrap, err := wrapFromEnvelope(options, env)
if err != nil {
return nil, err
}
return cekFromEnvelope(options, ctx, env, wrap)
}
func wrapFromEnvelope(options DecryptionClientOptions, env Envelope) (CipherDataDecrypter, error) {
f, ok := options.CryptoRegistry.GetWrap(env.WrapAlg)
if !ok || f == nil {
return nil, awserr.New(
"InvalidWrapAlgorithmError",
"wrap algorithm isn't supported, "+env.WrapAlg,
nil,
)
}
return f(env)
}
func cekFromEnvelope(options DecryptionClientOptions, ctx aws.Context, env Envelope, decrypter CipherDataDecrypter) (ContentCipher, error) {
f, ok := options.CryptoRegistry.GetCEK(env.CEKAlg)
if !ok || f == nil {
return nil, awserr.New(
"InvalidCEKAlgorithmError",
"cek algorithm isn't supported, "+env.CEKAlg,
nil,
)
}
key, err := base64.StdEncoding.DecodeString(env.CipherKey)
if err != nil {
return nil, err
}
iv, err := base64.StdEncoding.DecodeString(env.IV)
if err != nil {
return nil, err
}
if d, ok := decrypter.(CipherDataDecrypterWithContext); ok {
key, err = d.DecryptKeyWithContext(ctx, key)
} else {
key, err = decrypter.DecryptKey(key)
}
if err != nil {
return nil, err
}
cd := CipherData{
Key: key,
IV: iv,
CEKAlgorithm: env.CEKAlg,
Padder: getPadder(options, env.CEKAlg),
}
return f(cd)
}
// getPadder will return an unpadder with checking the cek algorithm specific padder.
// If there wasn't a cek algorithm specific padder, we check the padder itself.
// We return a no unpadder, if no unpadder was found. This means any customization
// either contained padding within the cipher implementation, and to maintain
// backwards compatibility we will simply not unpad anything.
func getPadder(options DecryptionClientOptions, cekAlg string) Padder {
padder, ok := options.CryptoRegistry.GetPadder(cekAlg)
if !ok {
padder, ok = options.CryptoRegistry.GetPadder(cekAlg[strings.LastIndex(cekAlg, "/")+1:])
if !ok {
return NoPadder
}
}
return padder
}