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auth.go (8626B)

      1 // Code generated by smithy-go-codegen DO NOT EDIT.
      2 
      3 package sts
      4 
      5 import (
      6 	"context"
      7 	"fmt"
      8 	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
      9 	smithy "github.com/aws/smithy-go"
     10 	smithyauth "github.com/aws/smithy-go/auth"
     11 	"github.com/aws/smithy-go/middleware"
     12 	smithyhttp "github.com/aws/smithy-go/transport/http"
     13 )
     14 
     15 func bindAuthParamsRegion(params *AuthResolverParameters, _ interface{}, options Options) {
     16 	params.Region = options.Region
     17 }
     18 
     19 type setLegacyContextSigningOptionsMiddleware struct {
     20 }
     21 
     22 func (*setLegacyContextSigningOptionsMiddleware) ID() string {
     23 	return "setLegacyContextSigningOptions"
     24 }
     25 
     26 func (m *setLegacyContextSigningOptionsMiddleware) HandleFinalize(ctx context.Context, in middleware.FinalizeInput, next middleware.FinalizeHandler) (
     27 	out middleware.FinalizeOutput, metadata middleware.Metadata, err error,
     28 ) {
     29 	rscheme := getResolvedAuthScheme(ctx)
     30 	schemeID := rscheme.Scheme.SchemeID()
     31 
     32 	if sn := awsmiddleware.GetSigningName(ctx); sn != "" {
     33 		if schemeID == "aws.auth#sigv4" {
     34 			smithyhttp.SetSigV4SigningName(&rscheme.SignerProperties, sn)
     35 		} else if schemeID == "aws.auth#sigv4a" {
     36 			smithyhttp.SetSigV4ASigningName(&rscheme.SignerProperties, sn)
     37 		}
     38 	}
     39 
     40 	if sr := awsmiddleware.GetSigningRegion(ctx); sr != "" {
     41 		if schemeID == "aws.auth#sigv4" {
     42 			smithyhttp.SetSigV4SigningRegion(&rscheme.SignerProperties, sr)
     43 		} else if schemeID == "aws.auth#sigv4a" {
     44 			smithyhttp.SetSigV4ASigningRegions(&rscheme.SignerProperties, []string{sr})
     45 		}
     46 	}
     47 
     48 	return next.HandleFinalize(ctx, in)
     49 }
     50 
     51 func addSetLegacyContextSigningOptionsMiddleware(stack *middleware.Stack) error {
     52 	return stack.Finalize.Insert(&setLegacyContextSigningOptionsMiddleware{}, "Signing", middleware.Before)
     53 }
     54 
     55 type withAnonymous struct {
     56 	resolver AuthSchemeResolver
     57 }
     58 
     59 var _ AuthSchemeResolver = (*withAnonymous)(nil)
     60 
     61 func (v *withAnonymous) ResolveAuthSchemes(ctx context.Context, params *AuthResolverParameters) ([]*smithyauth.Option, error) {
     62 	opts, err := v.resolver.ResolveAuthSchemes(ctx, params)
     63 	if err != nil {
     64 		return nil, err
     65 	}
     66 
     67 	opts = append(opts, &smithyauth.Option{
     68 		SchemeID: smithyauth.SchemeIDAnonymous,
     69 	})
     70 	return opts, nil
     71 }
     72 
     73 func wrapWithAnonymousAuth(options *Options) {
     74 	if _, ok := options.AuthSchemeResolver.(*defaultAuthSchemeResolver); !ok {
     75 		return
     76 	}
     77 
     78 	options.AuthSchemeResolver = &withAnonymous{
     79 		resolver: options.AuthSchemeResolver,
     80 	}
     81 }
     82 
     83 // AuthResolverParameters contains the set of inputs necessary for auth scheme
     84 // resolution.
     85 type AuthResolverParameters struct {
     86 	// The name of the operation being invoked.
     87 	Operation string
     88 
     89 	// The region in which the operation is being invoked.
     90 	Region string
     91 }
     92 
     93 func bindAuthResolverParams(operation string, input interface{}, options Options) *AuthResolverParameters {
     94 	params := &AuthResolverParameters{
     95 		Operation: operation,
     96 	}
     97 
     98 	bindAuthParamsRegion(params, input, options)
     99 
    100 	return params
    101 }
    102 
    103 // AuthSchemeResolver returns a set of possible authentication options for an
    104 // operation.
    105 type AuthSchemeResolver interface {
    106 	ResolveAuthSchemes(context.Context, *AuthResolverParameters) ([]*smithyauth.Option, error)
    107 }
    108 
    109 type defaultAuthSchemeResolver struct{}
    110 
    111 var _ AuthSchemeResolver = (*defaultAuthSchemeResolver)(nil)
    112 
    113 func (*defaultAuthSchemeResolver) ResolveAuthSchemes(ctx context.Context, params *AuthResolverParameters) ([]*smithyauth.Option, error) {
    114 	if overrides, ok := operationAuthOptions[params.Operation]; ok {
    115 		return overrides(params), nil
    116 	}
    117 	return serviceAuthOptions(params), nil
    118 }
    119 
    120 var operationAuthOptions = map[string]func(*AuthResolverParameters) []*smithyauth.Option{
    121 	"AssumeRoleWithSAML": func(params *AuthResolverParameters) []*smithyauth.Option {
    122 		return []*smithyauth.Option{
    123 			{SchemeID: smithyauth.SchemeIDAnonymous},
    124 		}
    125 	},
    126 
    127 	"AssumeRoleWithWebIdentity": func(params *AuthResolverParameters) []*smithyauth.Option {
    128 		return []*smithyauth.Option{
    129 			{SchemeID: smithyauth.SchemeIDAnonymous},
    130 		}
    131 	},
    132 }
    133 
    134 func serviceAuthOptions(params *AuthResolverParameters) []*smithyauth.Option {
    135 	return []*smithyauth.Option{
    136 		{
    137 			SchemeID: smithyauth.SchemeIDSigV4,
    138 			SignerProperties: func() smithy.Properties {
    139 				var props smithy.Properties
    140 				smithyhttp.SetSigV4SigningName(&props, "sts")
    141 				smithyhttp.SetSigV4SigningRegion(&props, params.Region)
    142 				return props
    143 			}(),
    144 		},
    145 	}
    146 }
    147 
    148 type resolveAuthSchemeMiddleware struct {
    149 	operation string
    150 	options   Options
    151 }
    152 
    153 func (*resolveAuthSchemeMiddleware) ID() string {
    154 	return "ResolveAuthScheme"
    155 }
    156 
    157 func (m *resolveAuthSchemeMiddleware) HandleFinalize(ctx context.Context, in middleware.FinalizeInput, next middleware.FinalizeHandler) (
    158 	out middleware.FinalizeOutput, metadata middleware.Metadata, err error,
    159 ) {
    160 	params := bindAuthResolverParams(m.operation, getOperationInput(ctx), m.options)
    161 	options, err := m.options.AuthSchemeResolver.ResolveAuthSchemes(ctx, params)
    162 	if err != nil {
    163 		return out, metadata, fmt.Errorf("resolve auth scheme: %w", err)
    164 	}
    165 
    166 	scheme, ok := m.selectScheme(options)
    167 	if !ok {
    168 		return out, metadata, fmt.Errorf("could not select an auth scheme")
    169 	}
    170 
    171 	ctx = setResolvedAuthScheme(ctx, scheme)
    172 	return next.HandleFinalize(ctx, in)
    173 }
    174 
    175 func (m *resolveAuthSchemeMiddleware) selectScheme(options []*smithyauth.Option) (*resolvedAuthScheme, bool) {
    176 	for _, option := range options {
    177 		if option.SchemeID == smithyauth.SchemeIDAnonymous {
    178 			return newResolvedAuthScheme(smithyhttp.NewAnonymousScheme(), option), true
    179 		}
    180 
    181 		for _, scheme := range m.options.AuthSchemes {
    182 			if scheme.SchemeID() != option.SchemeID {
    183 				continue
    184 			}
    185 
    186 			if scheme.IdentityResolver(m.options) != nil {
    187 				return newResolvedAuthScheme(scheme, option), true
    188 			}
    189 		}
    190 	}
    191 
    192 	return nil, false
    193 }
    194 
    195 type resolvedAuthSchemeKey struct{}
    196 
    197 type resolvedAuthScheme struct {
    198 	Scheme             smithyhttp.AuthScheme
    199 	IdentityProperties smithy.Properties
    200 	SignerProperties   smithy.Properties
    201 }
    202 
    203 func newResolvedAuthScheme(scheme smithyhttp.AuthScheme, option *smithyauth.Option) *resolvedAuthScheme {
    204 	return &resolvedAuthScheme{
    205 		Scheme:             scheme,
    206 		IdentityProperties: option.IdentityProperties,
    207 		SignerProperties:   option.SignerProperties,
    208 	}
    209 }
    210 
    211 func setResolvedAuthScheme(ctx context.Context, scheme *resolvedAuthScheme) context.Context {
    212 	return middleware.WithStackValue(ctx, resolvedAuthSchemeKey{}, scheme)
    213 }
    214 
    215 func getResolvedAuthScheme(ctx context.Context) *resolvedAuthScheme {
    216 	v, _ := middleware.GetStackValue(ctx, resolvedAuthSchemeKey{}).(*resolvedAuthScheme)
    217 	return v
    218 }
    219 
    220 type getIdentityMiddleware struct {
    221 	options Options
    222 }
    223 
    224 func (*getIdentityMiddleware) ID() string {
    225 	return "GetIdentity"
    226 }
    227 
    228 func (m *getIdentityMiddleware) HandleFinalize(ctx context.Context, in middleware.FinalizeInput, next middleware.FinalizeHandler) (
    229 	out middleware.FinalizeOutput, metadata middleware.Metadata, err error,
    230 ) {
    231 	rscheme := getResolvedAuthScheme(ctx)
    232 	if rscheme == nil {
    233 		return out, metadata, fmt.Errorf("no resolved auth scheme")
    234 	}
    235 
    236 	resolver := rscheme.Scheme.IdentityResolver(m.options)
    237 	if resolver == nil {
    238 		return out, metadata, fmt.Errorf("no identity resolver")
    239 	}
    240 
    241 	identity, err := resolver.GetIdentity(ctx, rscheme.IdentityProperties)
    242 	if err != nil {
    243 		return out, metadata, fmt.Errorf("get identity: %w", err)
    244 	}
    245 
    246 	ctx = setIdentity(ctx, identity)
    247 	return next.HandleFinalize(ctx, in)
    248 }
    249 
    250 type identityKey struct{}
    251 
    252 func setIdentity(ctx context.Context, identity smithyauth.Identity) context.Context {
    253 	return middleware.WithStackValue(ctx, identityKey{}, identity)
    254 }
    255 
    256 func getIdentity(ctx context.Context) smithyauth.Identity {
    257 	v, _ := middleware.GetStackValue(ctx, identityKey{}).(smithyauth.Identity)
    258 	return v
    259 }
    260 
    261 type signRequestMiddleware struct {
    262 }
    263 
    264 func (*signRequestMiddleware) ID() string {
    265 	return "Signing"
    266 }
    267 
    268 func (m *signRequestMiddleware) HandleFinalize(ctx context.Context, in middleware.FinalizeInput, next middleware.FinalizeHandler) (
    269 	out middleware.FinalizeOutput, metadata middleware.Metadata, err error,
    270 ) {
    271 	req, ok := in.Request.(*smithyhttp.Request)
    272 	if !ok {
    273 		return out, metadata, fmt.Errorf("unexpected transport type %T", in.Request)
    274 	}
    275 
    276 	rscheme := getResolvedAuthScheme(ctx)
    277 	if rscheme == nil {
    278 		return out, metadata, fmt.Errorf("no resolved auth scheme")
    279 	}
    280 
    281 	identity := getIdentity(ctx)
    282 	if identity == nil {
    283 		return out, metadata, fmt.Errorf("no identity")
    284 	}
    285 
    286 	signer := rscheme.Scheme.Signer()
    287 	if signer == nil {
    288 		return out, metadata, fmt.Errorf("no signer")
    289 	}
    290 
    291 	if err := signer.SignRequest(ctx, req, identity, rscheme.SignerProperties); err != nil {
    292 		return out, metadata, fmt.Errorf("sign request: %w", err)
    293 	}
    294 
    295 	return next.HandleFinalize(ctx, in)
    296 }