From 685b2fa0bc1ed7283532cbd173cc4ec5fbd4b88f Mon Sep 17 00:00:00 2001 From: ujuzy Date: Sun, 20 Mar 2022 16:51:28 +0300 Subject: [PATCH] [BIP-15] auth lib --- auth/errors.go | 7 +++ auth/go.mod | 18 +++++++ auth/go.sum | 124 ++++++++++++++++++++++++++++++++++++++++++++ auth/middleware.go | 73 ++++++++++++++++++++++++++ auth/parse_token.go | 26 ++++++++++ auth/sign_in.go | 44 ++++++++++++++++ 6 files changed, 292 insertions(+) create mode 100644 auth/errors.go create mode 100644 auth/go.mod create mode 100644 auth/go.sum create mode 100644 auth/middleware.go create mode 100644 auth/parse_token.go create mode 100644 auth/sign_in.go diff --git a/auth/errors.go b/auth/errors.go new file mode 100644 index 0000000..dbce269 --- /dev/null +++ b/auth/errors.go @@ -0,0 +1,7 @@ +package auth + +import "errors" + +var ErrInvalidAccessToken = errors.New("invalid auth token") +var ErrUserDoesNotExist = errors.New("user does not exist") +var ErrUserAlreadyExists = errors.New("user with such credentials already exist") diff --git a/auth/go.mod b/auth/go.mod new file mode 100644 index 0000000..863de26 --- /dev/null +++ b/auth/go.mod @@ -0,0 +1,18 @@ +module github.com/ibks-bank/libs/auth + +go 1.18 + +require ( + github.com/dgrijalva/jwt-go/v4 v4.0.0-preview1 + github.com/ibks-bank/libs/cerr v0.0.0-20220320134530-d51247524d6e + google.golang.org/grpc v1.45.0 +) + +require ( + github.com/golang/protobuf v1.5.2 // indirect + golang.org/x/net v0.0.0-20200822124328-c89045814202 // indirect + golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd // indirect + golang.org/x/text v0.3.0 // indirect + google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013 // indirect + google.golang.org/protobuf v1.26.0 // indirect +) diff --git a/auth/go.sum b/auth/go.sum new file mode 100644 index 0000000..99a8581 --- /dev/null +++ b/auth/go.sum @@ -0,0 +1,124 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= +github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= +github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= +github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc= +github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk= +github.com/cncf/udpa/go v0.0.0-20210930031921-04548b0d99d4/go.mod h1:6pvJx4me5XPnfI9Z40ddWsdw2W/uZgQLFXToKeRcDiI= +github.com/cncf/xds/go v0.0.0-20210805033703-aa0b78936158/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs= 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"google.golang.org/grpc/metadata" + "google.golang.org/grpc/status" +) + +const ( + UserKey = "X-Auth-User" + TokenKey = "X-Auth-Token" +) + +type userInfo struct { + Username string + Password string +} + +func (a *authorizer) Interceptor( + ctx context.Context, + req interface{}, + info *grpc.UnaryServerInfo, + handler grpc.UnaryHandler, +) (interface{}, error) { + + var err error + + switch info.FullMethod { + case "/profile_pb.Profile/SignUp", "/profile_pb.Profile/SignIn", "/profile_pb.Profile/SubmitCode": + default: + ctx, err = a.authorize(ctx) + if err != nil { + return nil, err + } + } + + return handler(ctx, req) +} + +func (a *authorizer) authorize(ctx context.Context) (context.Context, error) { + md, ok := metadata.FromIncomingContext(ctx) + if !ok { + return ctx, status.Errorf(codes.InvalidArgument, "Retrieving metadata is failed") + } + + authHeader, ok := md[strings.ToLower(TokenKey)] + if !ok { + return ctx, status.Errorf(codes.Unauthenticated, "Authorization token is not supplied") + } + + token := authHeader[0] + + username, password, err := ParseToken(token, []byte(a.key)) + if err != nil { + return ctx, status.Errorf(codes.Unauthenticated, err.Error()) + } + + return context.WithValue(ctx, UserKey, userInfo{Username: username, Password: password}), nil +} + +func GetUserInfo(ctx context.Context) (*userInfo, error) { + user, ok := ctx.Value(UserKey).(userInfo) + if !ok { + return nil, cerr.NewC("user info not found in context", codes.Unauthenticated) + } + + return &user, nil +} diff --git a/auth/parse_token.go b/auth/parse_token.go new file mode 100644 index 0000000..c5fb735 --- /dev/null +++ b/auth/parse_token.go @@ -0,0 +1,26 @@ +package auth + +import ( + "fmt" + + "github.com/dgrijalva/jwt-go/v4" +) + +func ParseToken(accessToken string, signingKey []byte) (string, string, error) { + token, err := jwt.ParseWithClaims(accessToken, &Claims{}, func(token *jwt.Token) (interface{}, error) { + if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok { + return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"]) + } + return signingKey, nil + }) + + if err != nil { + return "", "", err + } + + if claims, ok := token.Claims.(*Claims); ok && token.Valid { + return claims.Username, claims.Password, nil + } + + return "", "", ErrInvalidAccessToken +} diff --git a/auth/sign_in.go b/auth/sign_in.go new file mode 100644 index 0000000..4c2ab0a --- /dev/null +++ b/auth/sign_in.go @@ -0,0 +1,44 @@ +package auth + +import ( + "crypto/sha256" + "fmt" + "time" + + "github.com/dgrijalva/jwt-go/v4" +) + +type Claims struct { + jwt.StandardClaims + Username string `json:"username"` + Password string `json:"password"` +} + +type authorizer struct { + key string + expireDuration time.Duration +} + +func NewAuthorizer(key string, expireDuration time.Duration) *authorizer { + return &authorizer{key: key, expireDuration: expireDuration} +} + +func (a *authorizer) GetToken(login, password, salt string) (string, error) { + token := jwt.NewWithClaims(jwt.SigningMethodHS256, &Claims{ + StandardClaims: jwt.StandardClaims{ + ExpiresAt: jwt.At(time.Now().Add(a.expireDuration)), + IssuedAt: jwt.At(time.Now()), + }, + Username: login, + Password: HashPassword(password, salt), + }) + + return token.SignedString([]byte(a.key)) +} + +func HashPassword(password, salt string) string { + pwd := sha256.New() + pwd.Write([]byte(password)) + pwd.Write([]byte(salt)) + return fmt.Sprintf("%x", pwd.Sum(nil)) +}