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unix: add support for AF_ALG sockets on Linux

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Fixes golang/go#19033.

Change-Id: Icbd249f63cd4a9035a1decaa8bf4c521303b4494
Reviewed-on: https://go-review.googlesource.com/36805
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Matt Layher
2017-02-10 21:03:03 -05:00
committed by Brad Fitzpatrick
parent 0ed46b70d9
commit e24f485414
27 changed files with 297 additions and 0 deletions
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2
unix/mkerrors.sh
View File

@@ -114,6 +114,7 @@ includes_Linux='
#include <sys/time.h>
#include <sys/socket.h>
#include <linux/if.h>
#include <linux/if_alg.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
@@ -343,6 +344,7 @@ ccflags="$@"
$2 ~ /^(BPF|DLT)_/ ||
$2 ~ /^CLOCK_/ ||
$2 ~ /^CAN_/ ||
$2 ~ /^ALG_/ ||
$2 !~ "WMESGLEN" &&
$2 ~ /^W[A-Z0-9]+$/ {printf("\t%s = C.%s\n", $2, $2)}
$2 ~ /^__WCOREFLAG$/ {next}

99
unix/syscall_linux.go
View File

@@ -452,6 +452,105 @@ func (sa *SockaddrCAN) sockaddr() (unsafe.Pointer, _Socklen, error) {
return unsafe.Pointer(&sa.raw), SizeofSockaddrCAN, nil
}
// SockaddrALG implements the Sockaddr interface for AF_ALG type sockets.
// SockaddrALG enables userspace access to the Linux kernel's cryptography
// subsystem. The Type and Name fields specify which type of hash or cipher
// should be used with a given socket.
//
// To create a file descriptor that provides access to a hash or cipher, both
// Bind and Accept must be used. Once the setup process is complete, input
// data can be written to the socket, processed by the kernel, and then read
// back as hash output or ciphertext.
//
// Here is an example of using an AF_ALG socket with SHA1 hashing.
// The initial socket setup process is as follows:
//
// // Open a socket to perform SHA1 hashing.
// fd, _ := unix.Socket(unix.AF_ALG, unix.SOCK_SEQPACKET, 0)
// addr := &unix.SockaddrALG{Type: "hash", Name: "sha1"}
// unix.Bind(fd, addr)
// // Note: unix.Accept does not work at this time; must invoke accept()
// // manually using unix.Syscall.
// hashfd, _, _ := unix.Syscall(unix.SYS_ACCEPT, uintptr(fd), 0, 0)
//
// Once a file descriptor has been returned from Accept, it may be used to
// perform SHA1 hashing. The descriptor is not safe for concurrent use, but
// may be re-used repeatedly with subsequent Write and Read operations.
//
// When hashing a small byte slice or string, a single Write and Read may
// be used:
//
// // Assume hashfd is already configured using the setup process.
// hash := os.NewFile(hashfd, "sha1")
// // Hash an input string and read the results. Each Write discards
// // previous hash state. Read always reads the current state.
// b := make([]byte, 20)
// for i := 0; i < 2; i++ {
// io.WriteString(hash, "Hello, world.")
// hash.Read(b)
// fmt.Println(hex.EncodeToString(b))
// }
// // Output:
// // 2ae01472317d1935a84797ec1983ae243fc6aa28
// // 2ae01472317d1935a84797ec1983ae243fc6aa28
//
// For hashing larger byte slices, or byte streams such as those read from
// a file or socket, use Sendto with MSG_MORE to instruct the kernel to update
// the hash digest instead of creating a new one for a given chunk and finalizing it.
//
// // Assume hashfd and addr are already configured using the setup process.
// hash := os.NewFile(hashfd, "sha1")
// // Hash the contents of a file.
// f, _ := os.Open("/tmp/linux-4.10-rc7.tar.xz")
// b := make([]byte, 4096)
// for {
// n, err := f.Read(b)
// if err == io.EOF {
// break
// }
// unix.Sendto(hashfd, b[:n], unix.MSG_MORE, addr)
// }
// hash.Read(b)
// fmt.Println(hex.EncodeToString(b))
// // Output: 85cdcad0c06eef66f805ecce353bec9accbeecc5
//
// For more information, see: http://www.chronox.de/crypto-API/crypto/userspace-if.html.
type SockaddrALG struct {
Type string
Name string
Feature uint32
Mask uint32
raw RawSockaddrALG
}
func (sa *SockaddrALG) sockaddr() (unsafe.Pointer, _Socklen, error) {
// Leave room for NUL byte terminator.
if len(sa.Type) > 13 {
return nil, 0, EINVAL
}
if len(sa.Name) > 63 {
return nil, 0, EINVAL
}
sa.raw.Family = AF_ALG
sa.raw.Feat = sa.Feature
sa.raw.Mask = sa.Mask
typ, err := ByteSliceFromString(sa.Type)
if err != nil {
return nil, 0, err
}
name, err := ByteSliceFromString(sa.Name)
if err != nil {
return nil, 0, err
}
copy(sa.raw.Type[:], typ)
copy(sa.raw.Name[:], name)
return unsafe.Pointer(&sa.raw), SizeofSockaddrALG, nil
}
func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) {
switch rsa.Addr.Family {
case AF_NETLINK:

4
unix/types_linux.go
View File

@@ -59,6 +59,7 @@ package unix
#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <linux/can.h>
#include <linux/if_alg.h>
#ifdef TCSETS2
// On systems that have "struct termios2" use this as type Termios.
@@ -221,6 +222,8 @@ type RawSockaddrHCI C.struct_sockaddr_hci
type RawSockaddrCAN C.struct_sockaddr_can
type RawSockaddrALG C.struct_sockaddr_alg
type RawSockaddr C.struct_sockaddr
type RawSockaddrAny C.struct_sockaddr_any
@@ -262,6 +265,7 @@ const (
SizeofSockaddrNetlink = C.sizeof_struct_sockaddr_nl
SizeofSockaddrHCI = C.sizeof_struct_sockaddr_hci
SizeofSockaddrCAN = C.sizeof_struct_sockaddr_can
SizeofSockaddrALG = C.sizeof_struct_sockaddr_alg
SizeofLinger = C.sizeof_struct_linger
SizeofIPMreq = C.sizeof_struct_ip_mreq
SizeofIPMreqn = C.sizeof_struct_ip_mreqn

7
unix/zerrors_linux_386.go
View File

@@ -53,6 +53,13 @@ const (
AF_UNSPEC = 0x0
AF_WANPIPE = 0x19
AF_X25 = 0x9
ALG_OP_DECRYPT = 0x0
ALG_OP_ENCRYPT = 0x1
ALG_SET_AEAD_ASSOCLEN = 0x4
ALG_SET_AEAD_AUTHSIZE = 0x5
ALG_SET_IV = 0x2
ALG_SET_KEY = 0x1
ALG_SET_OP = 0x3
ARPHRD_ADAPT = 0x108
ARPHRD_APPLETLK = 0x8
ARPHRD_ARCNET = 0x7

7
unix/zerrors_linux_amd64.go
View File

@@ -53,6 +53,13 @@ const (
AF_UNSPEC = 0x0
AF_WANPIPE = 0x19
AF_X25 = 0x9
ALG_OP_DECRYPT = 0x0
ALG_OP_ENCRYPT = 0x1
ALG_SET_AEAD_ASSOCLEN = 0x4
ALG_SET_AEAD_AUTHSIZE = 0x5
ALG_SET_IV = 0x2
ALG_SET_KEY = 0x1
ALG_SET_OP = 0x3
ARPHRD_ADAPT = 0x108
ARPHRD_APPLETLK = 0x8
ARPHRD_ARCNET = 0x7

7
unix/zerrors_linux_arm.go
View File

@@ -52,6 +52,13 @@ const (
AF_UNSPEC = 0x0
AF_WANPIPE = 0x19
AF_X25 = 0x9
ALG_OP_DECRYPT = 0x0
ALG_OP_ENCRYPT = 0x1
ALG_SET_AEAD_ASSOCLEN = 0x4
ALG_SET_AEAD_AUTHSIZE = 0x5
ALG_SET_IV = 0x2
ALG_SET_KEY = 0x1
ALG_SET_OP = 0x3
ARPHRD_ADAPT = 0x108
ARPHRD_APPLETLK = 0x8
ARPHRD_ARCNET = 0x7

7
unix/zerrors_linux_arm64.go
View File

@@ -54,6 +54,13 @@ const (
AF_VSOCK = 0x28
AF_WANPIPE = 0x19
AF_X25 = 0x9
ALG_OP_DECRYPT = 0x0
ALG_OP_ENCRYPT = 0x1
ALG_SET_AEAD_ASSOCLEN = 0x4
ALG_SET_AEAD_AUTHSIZE = 0x5
ALG_SET_IV = 0x2
ALG_SET_KEY = 0x1
ALG_SET_OP = 0x3
ARPHRD_ADAPT = 0x108
ARPHRD_APPLETLK = 0x8
ARPHRD_ARCNET = 0x7

7
unix/zerrors_linux_mips.go
View File

@@ -52,6 +52,13 @@ const (
AF_UNSPEC = 0x0
AF_WANPIPE = 0x19
AF_X25 = 0x9
ALG_OP_DECRYPT = 0x0
ALG_OP_ENCRYPT = 0x1
ALG_SET_AEAD_ASSOCLEN = 0x4
ALG_SET_AEAD_AUTHSIZE = 0x5
ALG_SET_IV = 0x2
ALG_SET_KEY = 0x1
ALG_SET_OP = 0x3
ARPHRD_ADAPT = 0x108
ARPHRD_APPLETLK = 0x8
ARPHRD_ARCNET = 0x7

7
unix/zerrors_linux_mips64.go
View File

@@ -56,6 +56,13 @@ const (
AF_VSOCK = 0x28
AF_WANPIPE = 0x19
AF_X25 = 0x9
ALG_OP_DECRYPT = 0x0
ALG_OP_ENCRYPT = 0x1
ALG_SET_AEAD_ASSOCLEN = 0x4
ALG_SET_AEAD_AUTHSIZE = 0x5
ALG_SET_IV = 0x2
ALG_SET_KEY = 0x1
ALG_SET_OP = 0x3
ARPHRD_6LOWPAN = 0x339
ARPHRD_ADAPT = 0x108
ARPHRD_APPLETLK = 0x8

7
unix/zerrors_linux_mips64le.go
View File

@@ -56,6 +56,13 @@ const (
AF_VSOCK = 0x28
AF_WANPIPE = 0x19
AF_X25 = 0x9
ALG_OP_DECRYPT = 0x0
ALG_OP_ENCRYPT = 0x1
ALG_SET_AEAD_ASSOCLEN = 0x4
ALG_SET_AEAD_AUTHSIZE = 0x5
ALG_SET_IV = 0x2
ALG_SET_KEY = 0x1
ALG_SET_OP = 0x3
ARPHRD_6LOWPAN = 0x339
ARPHRD_ADAPT = 0x108
ARPHRD_APPLETLK = 0x8

7
unix/zerrors_linux_mipsle.go
View File

@@ -57,6 +57,13 @@ const (
AF_VSOCK = 0x28
AF_WANPIPE = 0x19
AF_X25 = 0x9
ALG_OP_DECRYPT = 0x0
ALG_OP_ENCRYPT = 0x1
ALG_SET_AEAD_ASSOCLEN = 0x4
ALG_SET_AEAD_AUTHSIZE = 0x5
ALG_SET_IV = 0x2
ALG_SET_KEY = 0x1
ALG_SET_OP = 0x3
ARPHRD_6LOWPAN = 0x339
ARPHRD_ADAPT = 0x108
ARPHRD_APPLETLK = 0x8

7
unix/zerrors_linux_ppc64.go
View File

@@ -54,6 +54,13 @@ const (
AF_VSOCK = 0x28
AF_WANPIPE = 0x19
AF_X25 = 0x9
ALG_OP_DECRYPT = 0x0
ALG_OP_ENCRYPT = 0x1
ALG_SET_AEAD_ASSOCLEN = 0x4
ALG_SET_AEAD_AUTHSIZE = 0x5
ALG_SET_IV = 0x2
ALG_SET_KEY = 0x1
ALG_SET_OP = 0x3
ARPHRD_6LOWPAN = 0x339
ARPHRD_ADAPT = 0x108
ARPHRD_APPLETLK = 0x8

7
unix/zerrors_linux_ppc64le.go
View File

@@ -54,6 +54,13 @@ const (
AF_VSOCK = 0x28
AF_WANPIPE = 0x19
AF_X25 = 0x9
ALG_OP_DECRYPT = 0x0
ALG_OP_ENCRYPT = 0x1
ALG_SET_AEAD_ASSOCLEN = 0x4
ALG_SET_AEAD_AUTHSIZE = 0x5
ALG_SET_IV = 0x2
ALG_SET_KEY = 0x1
ALG_SET_OP = 0x3
ARPHRD_ADAPT = 0x108
ARPHRD_APPLETLK = 0x8
ARPHRD_ARCNET = 0x7

7
unix/zerrors_linux_s390x.go
View File

@@ -56,6 +56,13 @@ const (
AF_VSOCK = 0x28
AF_WANPIPE = 0x19
AF_X25 = 0x9
ALG_OP_DECRYPT = 0x0
ALG_OP_ENCRYPT = 0x1
ALG_SET_AEAD_ASSOCLEN = 0x4
ALG_SET_AEAD_AUTHSIZE = 0x5
ALG_SET_IV = 0x2
ALG_SET_KEY = 0x1
ALG_SET_OP = 0x3
ARPHRD_6LOWPAN = 0x339
ARPHRD_ADAPT = 0x108
ARPHRD_APPLETLK = 0x8

7
unix/zerrors_linux_sparc64.go
View File

@@ -57,6 +57,13 @@ const (
AF_VSOCK = 0x28
AF_WANPIPE = 0x19
AF_X25 = 0x9
ALG_OP_DECRYPT = 0x0
ALG_OP_ENCRYPT = 0x1
ALG_SET_AEAD_ASSOCLEN = 0x4
ALG_SET_AEAD_AUTHSIZE = 0x5
ALG_SET_IV = 0x2
ALG_SET_KEY = 0x1
ALG_SET_OP = 0x3
ARPHRD_6LOWPAN = 0x339
ARPHRD_ADAPT = 0x108
ARPHRD_APPLETLK = 0x8

9
unix/ztypes_linux_386.go
View File

@@ -210,6 +210,14 @@ type RawSockaddrCAN struct {
Addr [8]byte
}
type RawSockaddrALG struct {
Family uint16
Type [14]uint8
Feat uint32
Mask uint32
Name [64]uint8
}
type RawSockaddr struct {
Family uint16
Data [14]int8
@@ -334,6 +342,7 @@ const (
SizeofSockaddrNetlink = 0xc
SizeofSockaddrHCI = 0x6
SizeofSockaddrCAN = 0x10
SizeofSockaddrALG = 0x58
SizeofLinger = 0x8
SizeofIPMreq = 0x8
SizeofIPMreqn = 0xc

9
unix/ztypes_linux_amd64.go
View File

@@ -212,6 +212,14 @@ type RawSockaddrCAN struct {
Addr [8]byte
}
type RawSockaddrALG struct {
Family uint16
Type [14]uint8
Feat uint32
Mask uint32
Name [64]uint8
}
type RawSockaddr struct {
Family uint16
Data [14]int8
@@ -338,6 +346,7 @@ const (
SizeofSockaddrNetlink = 0xc
SizeofSockaddrHCI = 0x6
SizeofSockaddrCAN = 0x10
SizeofSockaddrALG = 0x58
SizeofLinger = 0x8
SizeofIPMreq = 0x8
SizeofIPMreqn = 0xc

9
unix/ztypes_linux_arm.go
View File

@@ -214,6 +214,14 @@ type RawSockaddrCAN struct {
Addr [8]byte
}
type RawSockaddrALG struct {
Family uint16
Type [14]uint8
Feat uint32
Mask uint32
Name [64]uint8
}
type RawSockaddr struct {
Family uint16
Data [14]uint8
@@ -338,6 +346,7 @@ const (
SizeofSockaddrNetlink = 0xc
SizeofSockaddrHCI = 0x6
SizeofSockaddrCAN = 0x10
SizeofSockaddrALG = 0x58
SizeofLinger = 0x8
SizeofIPMreq = 0x8
SizeofIPMreqn = 0xc

9
unix/ztypes_linux_arm64.go
View File

@@ -213,6 +213,14 @@ type RawSockaddrCAN struct {
Addr [8]byte
}
type RawSockaddrALG struct {
Family uint16
Type [14]uint8
Feat uint32
Mask uint32
Name [64]uint8
}
type RawSockaddr struct {
Family uint16
Data [14]int8
@@ -339,6 +347,7 @@ const (
SizeofSockaddrNetlink = 0xc
SizeofSockaddrHCI = 0x6
SizeofSockaddrCAN = 0x10
SizeofSockaddrALG = 0x58
SizeofLinger = 0x8
SizeofIPMreq = 0x8
SizeofIPMreqn = 0xc

9
unix/ztypes_linux_mips.go
View File

@@ -213,6 +213,14 @@ type RawSockaddrCAN struct {
Addr [8]byte
}
type RawSockaddrALG struct {
Family uint16
Type [14]uint8
Feat uint32
Mask uint32
Name [64]uint8
}
type RawSockaddr struct {
Family uint16
Data [14]int8
@@ -336,6 +344,7 @@ const (
SizeofSockaddrNetlink = 0xc
SizeofSockaddrHCI = 0x6
SizeofSockaddrCAN = 0x10
SizeofSockaddrALG = 0x58
SizeofLinger = 0x8
SizeofIPMreq = 0x8
SizeofIPMreqn = 0xc

9
unix/ztypes_linux_mips64.go
View File

@@ -213,6 +213,14 @@ type RawSockaddrCAN struct {
Addr [8]byte
}
type RawSockaddrALG struct {
Family uint16
Type [14]uint8
Feat uint32
Mask uint32
Name [64]uint8
}
type RawSockaddr struct {
Family uint16
Data [14]int8
@@ -338,6 +346,7 @@ const (
SizeofSockaddrNetlink = 0xc
SizeofSockaddrHCI = 0x6
SizeofSockaddrCAN = 0x10
SizeofSockaddrALG = 0x58
SizeofLinger = 0x8
SizeofIPMreq = 0x8
SizeofIPMreqn = 0xc

9
unix/ztypes_linux_mips64le.go
View File

@@ -213,6 +213,14 @@ type RawSockaddrCAN struct {
Addr [8]byte
}
type RawSockaddrALG struct {
Family uint16
Type [14]uint8
Feat uint32
Mask uint32
Name [64]uint8
}
type RawSockaddr struct {
Family uint16
Data [14]int8
@@ -338,6 +346,7 @@ const (
SizeofSockaddrNetlink = 0xc
SizeofSockaddrHCI = 0x6
SizeofSockaddrCAN = 0x10
SizeofSockaddrALG = 0x58
SizeofLinger = 0x8
SizeofIPMreq = 0x8
SizeofIPMreqn = 0xc

9
unix/ztypes_linux_mipsle.go
View File

@@ -213,6 +213,14 @@ type RawSockaddrCAN struct {
Addr [8]byte
}
type RawSockaddrALG struct {
Family uint16
Type [14]uint8
Feat uint32
Mask uint32
Name [64]uint8
}
type RawSockaddr struct {
Family uint16
Data [14]int8
@@ -336,6 +344,7 @@ const (
SizeofSockaddrNetlink = 0xc
SizeofSockaddrHCI = 0x6
SizeofSockaddrCAN = 0x10
SizeofSockaddrALG = 0x58
SizeofLinger = 0x8
SizeofIPMreq = 0x8
SizeofIPMreqn = 0xc

9
unix/ztypes_linux_ppc64.go
View File

@@ -214,6 +214,14 @@ type RawSockaddrCAN struct {
Addr [8]byte
}
type RawSockaddrALG struct {
Family uint16
Type [14]uint8
Feat uint32
Mask uint32
Name [64]uint8
}
type RawSockaddr struct {
Family uint16
Data [14]uint8
@@ -340,6 +348,7 @@ const (
SizeofSockaddrNetlink = 0xc
SizeofSockaddrHCI = 0x6
SizeofSockaddrCAN = 0x10
SizeofSockaddrALG = 0x58
SizeofLinger = 0x8
SizeofIPMreq = 0x8
SizeofIPMreqn = 0xc

9
unix/ztypes_linux_ppc64le.go
View File

@@ -214,6 +214,14 @@ type RawSockaddrCAN struct {
Addr [8]byte
}
type RawSockaddrALG struct {
Family uint16
Type [14]uint8
Feat uint32
Mask uint32
Name [64]uint8
}
type RawSockaddr struct {
Family uint16
Data [14]uint8
@@ -340,6 +348,7 @@ const (
SizeofSockaddrNetlink = 0xc
SizeofSockaddrHCI = 0x6
SizeofSockaddrCAN = 0x10
SizeofSockaddrALG = 0x58
SizeofLinger = 0x8
SizeofIPMreq = 0x8
SizeofIPMreqn = 0xc

9
unix/ztypes_linux_s390x.go
View File

@@ -213,6 +213,14 @@ type RawSockaddrCAN struct {
Addr [8]byte
}
type RawSockaddrALG struct {
Family uint16
Type [14]uint8
Feat uint32
Mask uint32
Name [64]uint8
}
type RawSockaddr struct {
Family uint16
Data [14]int8
@@ -338,6 +346,7 @@ const (
SizeofSockaddrNetlink = 0xc
SizeofSockaddrHCI = 0x6
SizeofSockaddrCAN = 0x10
SizeofSockaddrALG = 0x58
SizeofLinger = 0x8
SizeofIPMreq = 0x8
SizeofIPMreqn = 0xc

9
unix/ztypes_linux_sparc64.go
View File

@@ -218,6 +218,14 @@ type RawSockaddrCAN struct {
Addr [8]byte
}
type RawSockaddrALG struct {
Family uint16
Type [14]uint8
Feat uint32
Mask uint32
Name [64]uint8
}
type RawSockaddr struct {
Family uint16
Data [14]int8
@@ -343,6 +351,7 @@ const (
SizeofSockaddrNetlink = 0xc
SizeofSockaddrHCI = 0x6
SizeofSockaddrCAN = 0x10
SizeofSockaddrALG = 0x58
SizeofLinger = 0x8
SizeofIPMreq = 0x8
SizeofIPMreqn = 0xc