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ssl.zig
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const std = @import("std");
// Export C for advanced interfacing
pub const c = @cImport({
@cInclude("bearssl.h");
@cInclude("brssl.h");
@cInclude("unistd.h");
});
pub const BearError = error{
BAD_PARAM,
BAD_STATE,
UNSUPPORTED_VERSION,
BAD_VERSION,
BAD_LENGTH,
TOO_LARGE,
BAD_MAC,
NO_RANDOM,
UNKNOWN_TYPE,
UNEXPECTED,
BAD_CCS,
BAD_ALERT,
BAD_HANDSHAKE,
OVERSIZED_ID,
BAD_CIPHER_SUITE,
BAD_COMPRESSION,
BAD_FRAGLEN,
BAD_SECRENEG,
EXTRA_EXTENSION,
BAD_SNI,
BAD_HELLO_DONE,
LIMIT_EXCEEDED,
BAD_FINISHED,
RESUME_MISMATCH,
INVALID_ALGORITHM,
BAD_SIGNATURE,
WRONG_KEY_USAGE,
NO_CLIENT_AUTH,
IO,
X509_INVALID_VALUE,
X509_TRUNCATED,
X509_EMPTY_CHAIN,
X509_INNER_TRUNC,
X509_BAD_TAG_CLASS,
X509_BAD_TAG_VALUE,
X509_INDEFINITE_LENGTH,
X509_EXTRA_ELEMENT,
X509_UNEXPECTED,
X509_NOT_CONSTRUCTED,
X509_NOT_PRIMITIVE,
X509_PARTIAL_BYTE,
X509_BAD_BOOLEAN,
X509_OVERFLOW,
X509_BAD_DN,
X509_BAD_TIME,
X509_UNSUPPORTED,
X509_LIMIT_EXCEEDED,
X509_WRONG_KEY_TYPE,
X509_BAD_SIGNATURE,
X509_TIME_UNKNOWN,
X509_EXPIRED,
X509_DN_MISMATCH,
X509_BAD_SERVER_NAME,
X509_CRITICAL_EXTENSION,
X509_NOT_CA,
X509_FORBIDDEN_KEY_USAGE,
X509_WEAK_PUBLIC_KEY,
X509_NOT_TRUSTED,
UNKNOWN_ERROR_552,
UNKNOWN_ERROR_582,
};
pub fn convertError(err: c_int) BearError {
return switch (err) {
c.BR_ERR_BAD_PARAM => error.BAD_PARAM,
c.BR_ERR_BAD_STATE => error.BAD_STATE,
c.BR_ERR_UNSUPPORTED_VERSION => error.UNSUPPORTED_VERSION,
c.BR_ERR_BAD_VERSION => error.BAD_VERSION,
c.BR_ERR_BAD_LENGTH => error.BAD_LENGTH,
c.BR_ERR_TOO_LARGE => error.TOO_LARGE,
c.BR_ERR_BAD_MAC => error.BAD_MAC,
c.BR_ERR_NO_RANDOM => error.NO_RANDOM,
c.BR_ERR_UNKNOWN_TYPE => error.UNKNOWN_TYPE,
c.BR_ERR_UNEXPECTED => error.UNEXPECTED,
c.BR_ERR_BAD_CCS => error.BAD_CCS,
c.BR_ERR_BAD_ALERT => error.BAD_ALERT,
c.BR_ERR_BAD_HANDSHAKE => error.BAD_HANDSHAKE,
c.BR_ERR_OVERSIZED_ID => error.OVERSIZED_ID,
c.BR_ERR_BAD_CIPHER_SUITE => error.BAD_CIPHER_SUITE,
c.BR_ERR_BAD_COMPRESSION => error.BAD_COMPRESSION,
c.BR_ERR_BAD_FRAGLEN => error.BAD_FRAGLEN,
c.BR_ERR_BAD_SECRENEG => error.BAD_SECRENEG,
c.BR_ERR_EXTRA_EXTENSION => error.EXTRA_EXTENSION,
c.BR_ERR_BAD_SNI => error.BAD_SNI,
c.BR_ERR_BAD_HELLO_DONE => error.BAD_HELLO_DONE,
c.BR_ERR_LIMIT_EXCEEDED => error.LIMIT_EXCEEDED,
c.BR_ERR_BAD_FINISHED => error.BAD_FINISHED,
c.BR_ERR_RESUME_MISMATCH => error.RESUME_MISMATCH,
c.BR_ERR_INVALID_ALGORITHM => error.INVALID_ALGORITHM,
c.BR_ERR_BAD_SIGNATURE => error.BAD_SIGNATURE,
c.BR_ERR_WRONG_KEY_USAGE => error.WRONG_KEY_USAGE,
c.BR_ERR_NO_CLIENT_AUTH => error.NO_CLIENT_AUTH,
c.BR_ERR_IO => error.IO,
c.BR_ERR_X509_INVALID_VALUE => error.X509_INVALID_VALUE,
c.BR_ERR_X509_TRUNCATED => error.X509_TRUNCATED,
c.BR_ERR_X509_EMPTY_CHAIN => error.X509_EMPTY_CHAIN,
c.BR_ERR_X509_INNER_TRUNC => error.X509_INNER_TRUNC,
c.BR_ERR_X509_BAD_TAG_CLASS => error.X509_BAD_TAG_CLASS,
c.BR_ERR_X509_BAD_TAG_VALUE => error.X509_BAD_TAG_VALUE,
c.BR_ERR_X509_INDEFINITE_LENGTH => error.X509_INDEFINITE_LENGTH,
c.BR_ERR_X509_EXTRA_ELEMENT => error.X509_EXTRA_ELEMENT,
c.BR_ERR_X509_UNEXPECTED => error.X509_UNEXPECTED,
c.BR_ERR_X509_NOT_CONSTRUCTED => error.X509_NOT_CONSTRUCTED,
c.BR_ERR_X509_NOT_PRIMITIVE => error.X509_NOT_PRIMITIVE,
c.BR_ERR_X509_PARTIAL_BYTE => error.X509_PARTIAL_BYTE,
c.BR_ERR_X509_BAD_BOOLEAN => error.X509_BAD_BOOLEAN,
c.BR_ERR_X509_OVERFLOW => error.X509_OVERFLOW,
c.BR_ERR_X509_BAD_DN => error.X509_BAD_DN,
c.BR_ERR_X509_BAD_TIME => error.X509_BAD_TIME,
c.BR_ERR_X509_UNSUPPORTED => error.X509_UNSUPPORTED,
c.BR_ERR_X509_LIMIT_EXCEEDED => error.X509_LIMIT_EXCEEDED,
c.BR_ERR_X509_WRONG_KEY_TYPE => error.X509_WRONG_KEY_TYPE,
c.BR_ERR_X509_BAD_SIGNATURE => error.X509_BAD_SIGNATURE,
c.BR_ERR_X509_TIME_UNKNOWN => error.X509_TIME_UNKNOWN,
c.BR_ERR_X509_EXPIRED => error.X509_EXPIRED,
c.BR_ERR_X509_DN_MISMATCH => error.X509_DN_MISMATCH,
c.BR_ERR_X509_BAD_SERVER_NAME => error.X509_BAD_SERVER_NAME,
c.BR_ERR_X509_CRITICAL_EXTENSION => error.X509_CRITICAL_EXTENSION,
c.BR_ERR_X509_NOT_CA => error.X509_NOT_CA,
c.BR_ERR_X509_FORBIDDEN_KEY_USAGE => error.X509_FORBIDDEN_KEY_USAGE,
c.BR_ERR_X509_WEAK_PUBLIC_KEY => error.X509_WEAK_PUBLIC_KEY,
c.BR_ERR_X509_NOT_TRUSTED => error.X509_NOT_TRUSTED,
552 => error.UNKNOWN_ERROR_552,
582 => error.UNKNOWN_ERROR_582,
else => std.debug.panic("missing error code: {}", .{err}),
};
}
pub fn initStream(engine: *c.br_ssl_engine_context, in_stream: anytype, out_stream: anytype) Stream(@TypeOf(in_stream), @TypeOf(out_stream)) {
std.debug.assert(@typeInfo(@TypeOf(in_stream)) == .Pointer);
std.debug.assert(@typeInfo(@TypeOf(out_stream)) == .Pointer);
return Stream(@TypeOf(in_stream), @TypeOf(out_stream)).init(engine, in_stream, out_stream);
}
pub fn Stream(comptime SrcInStream: type, comptime SrcOutStream: type) type {
return struct {
const Self = @This();
engine: *c.br_ssl_engine_context,
ioc: c.br_sslio_context,
/// Initializes a new SSLStream backed by the ssl engine and file descriptor.
pub fn init(engine: *c.br_ssl_engine_context, in_stream: SrcInStream, out_stream: SrcOutStream) Self {
var stream = Self{
.engine = engine,
.ioc = undefined,
};
c.br_sslio_init(
&stream.ioc,
stream.engine,
sockRead,
@ptrCast(in_stream),
sockWrite,
@ptrCast(out_stream),
);
return stream;
}
/// Closes the connection. Note that this may fail when the remote part does not terminate the SSL stream correctly.
pub fn close(self: *Self) !void {
if (c.br_sslio_close(&self.ioc) < 0)
return convertError(c.br_ssl_engine_last_error(self.engine));
}
/// Flushes all pending data into the fd.
pub fn flush(self: *Self) !void {
if (c.br_sslio_flush(&self.ioc) < 0)
return convertError(c.br_ssl_engine_last_error(self.engine));
}
/// low level read from fd to ssl library
fn sockRead(ctx: ?*anyopaque, buf: [*c]u8, len: usize) callconv(.C) c_int {
var input = @as(SrcInStream, @ptrCast(@alignCast(ctx.?)));
return if (input.read(buf[0..len])) |num|
if (num > 0) @intCast(num) else -1
else |_|
-1;
}
/// low level write from ssl library to fd
fn sockWrite(ctx: ?*anyopaque, buf: [*c]const u8, len: usize) callconv(.C) c_int {
var output = @as(SrcOutStream, @ptrCast(@alignCast(ctx.?)));
return if (output.write(buf[0..len])) |num|
if (num > 0) @intCast(num) else -1
else |_|
-1;
}
const ReadError = error{EndOfStream} || BearError;
/// reads some data from the ssl stream.
pub fn read(self: *Self, buffer: []u8) ReadError!usize {
const result = c.br_sslio_read(&self.ioc, buffer.ptr, buffer.len);
if (result < 0) {
const errc = c.br_ssl_engine_last_error(self.engine);
if (errc == c.BR_ERR_OK)
return 0;
return convertError(errc);
}
return @intCast(result);
}
const WriteError = error{EndOfStream} || BearError;
/// writes some data to the ssl stream.
pub fn write(self: *Self, bytes: []const u8) WriteError!usize {
const result = c.br_sslio_write(&self.ioc, bytes.ptr, bytes.len);
if (result < 0) {
const errc = c.br_ssl_engine_last_error(self.engine);
if (errc == c.BR_ERR_OK)
return 0;
return convertError(errc);
}
return @intCast(result);
}
pub const DstInStream = std.io.InStream(*Self, ReadError, read);
// todo inStream and outStream are deprecated, it's reader and writer now
pub fn inStream(self: *Self) DstInStream {
return .{ .context = self };
}
pub const DstOutStream = std.io.OutStream(*Self, WriteError, write);
pub fn outStream(self: *Self) DstOutStream {
return .{ .context = self };
}
};
}