23

I have been searching for an example I can understand of how to validate the signature of a JWT with the GO Language.

This might be especially tricky since I am using Okta, and it uses JWKs, so it is not especially straight forward.

When I receive a JWT, I can decode it no problem, just get stuck on how to verify the signature.

Below I have included a JWT, and the JWK details. If anyone is comfortable with this, and can complete signature validation with an Example, that would be amazing.:)

You can get to all of this information here: https://oktaproxy.com/oidcgenerator.php, this site will generate a JWT from Okta, and the keys can be obtained here: https://companyx.okta.com/oauth2/v1/keys.

Here is the JWT: 

eyJhbGciOiJSUzI1NiIsImtpZCI6Ind5TXdLNEE2Q0w5UXcxMXVvZlZleVExMTlYeVgteHlreW1ra1h5Z1o1T00ifQ.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.OtVyCK0sE6Cuclg9VMD2AwLhqEyq2nv3a1bfxlzeS-bdu9KtYxcPSxJ6vxMcSSbMIIq9eEz9JFMU80zqgDPHBCjlOsC5SIPz7mm1Z3gCwq4zsFJ-2NIzYxA3p161ZRsPv_3bUyg9B_DPFyBoihgwWm6yrvrb4rmHXrDkjxpxCLPp3OeIpc_kb2t8r5HEQ5UBZPrsiScvuoVW13YwWpze59qBl_84n9xdmQ5pS7DklzkAVgqJT_NWBlb5uo6eW26HtJwHzss7xOIdQtcOtC1Gj3O82a55VJSQnsEEBeqG1ESb5Haq_hJgxYQnBssKydPCIxdZiye-0Ll9L8wWwpzwig

Here are the Keys:

{
   "keys":[
      {
         "alg":"RS256",
         "e":"AQAB",
         "n":"ok6rvXu95337IxsDXrKzlIqw_I_zPDG8JyEw2CTOtNMoDi1QzpXQVMGj2snNEmvNYaCTmFf51I-EDgeFLLexr40jzBXlg72quV4aw4yiNuxkigW0gMA92OmaT2jMRIdDZM8mVokoxyPfLub2YnXHFq0XuUUgkX_TlutVhgGbyPN0M12teYZtMYo2AUzIRggONhHvnibHP0CPWDjCwSfp3On1Recn4DPxbn3DuGslF2myalmCtkujNcrhHLhwYPP-yZFb8e0XSNTcQvXaQxAqmnWH6NXcOtaeWMQe43PNTAyNinhndgI8ozG3Hz-1NzHssDH_yk6UYFSszhDbWAzyqw",
         "kid":"wyMwK4A6CL9Qw11uofVeyQ119XyX-xykymkkXygZ5OM",
         "kty":"RSA",
         "use":"sig"
      },
      {
         "alg":"RS256",
         "e":"AQAB",
         "n":"nXv6FSAcMjuanQ2hIIUb8Vkqe94t98kPh2T8-0j6-Jq8pOclgKdtVeIZcBE9F_XiuJvg4b6WVs-uvA-pS8mmMvQ21xU5Q_37Cojv8v_QlHWETHwEJdXXiY2Xq5LgXDSwEhhdDZHSMQYDuvhp_P6nl2LNqqUvJkjoFWcnn2btgSIUQROIaDdxtx7_2h4oUi5u11BGSF2SZZiEpDAKT08Htv3uwXdwDA6ll99fbi8X8RmH5oY_tIZTeIzu50qHxElPewoYO8QrJYsO9oFcCPMHGxYWjXQEa-QZYgo0wS9zRIkeJc5kshc4-9Uhv2DVIjk_-ofGlML9ieggGyillBKptw",
         "kid":"GRF55Lbzgg4sANCmER-sm55eX_qUOpY8UTptDmDG_6U",
         "kty":"RSA",
         "use":"sig"
      }
   ]
}
4

3 回答 3

42

下面是一个 JWT 解码和验证的例子。它同时使用jwt-go和jwk包：

package main

import (
    "errors"
    "fmt"

    "github.com/dgrijalva/jwt-go"
    "github.com/lestrrat-go/jwx/jwk"
)

const token = `eyJhbGciOiJSUzI1NiIsImtpZCI6Ind5TXdLNEE2Q0w5UXcxMXVvZlZleVExMTlYeVgteHlreW1ra1h5Z1o1T00ifQ.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.OtVyCK0sE6Cuclg9VMD2AwLhqEyq2nv3a1bfxlzeS-bdu9KtYxcPSxJ6vxMcSSbMIIq9eEz9JFMU80zqgDPHBCjlOsC5SIPz7mm1Z3gCwq4zsFJ-2NIzYxA3p161ZRsPv_3bUyg9B_DPFyBoihgwWm6yrvrb4rmHXrDkjxpxCLPp3OeIpc_kb2t8r5HEQ5UBZPrsiScvuoVW13YwWpze59qBl_84n9xdmQ5pS7DklzkAVgqJT_NWBlb5uo6eW26HtJwHzss7xOIdQtcOtC1Gj3O82a55VJSQnsEEBeqG1ESb5Haq_hJgxYQnBssKydPCIxdZiye-0Ll9L8wWwpzwig`

const jwksURL = `https://companyx.okta.com/oauth2/v1/keys`

func getKey(token *jwt.Token) (interface{}, error) {

    // TODO: cache response so we don't have to make a request every time
    // we want to verify a JWT
    set, err := jwk.FetchHTTP(jwksURL)
    if err != nil {
        return nil, err
    }

    keyID, ok := token.Header["kid"].(string)
    if !ok {
        return nil, errors.New("expecting JWT header to have string kid")
    }

    if key := set.LookupKeyID(keyID); len(key) == 1 {
        return key[0].Materialize()
    }

    return nil, fmt.Errorf("unable to find key %q", keyID)
}

func main() {
    token, err := jwt.Parse(token, getKey)
    if err != nil {
        panic(err)
    }
    claims := token.Claims.(jwt.MapClaims)
    for key, value := range claims {
        fmt.Printf("%s\t%v\n", key, value)
    }
}
于 2016-12-10T17:07:32.753 回答
3

我最近有一个非常相似的用例，所以我阅读了一些 RFC 并编写了这个包：github.com/MicahParks/keyfunc.

它允许您使用最流行的 JWT 包github.com/dgrijalva/jwt-go, 来解析令牌。它还可以在后台 goroutine 中自动重新加载 JWKS 的内容。

使用您的 JWKS 和 JWT，这里有两个示例。第一个将通过 HTTPS 从远程 URL 加载 JWKS。第二个将从静态 JSON 加载它。

来自通过 HTTPS 托管的 JWKS

package main

import (
    "log"
    "time"

    "github.com/dgrijalva/jwt-go"

    "github.com/MicahParks/keyfunc"
)

func main() {

    // Get the JWKS URL.
    jwksURL := "https://companyx.okta.com/oauth2/v1/keys"

    // Create the keyfunc options. Refresh the JWKS every hour and log errors.
    refreshInterval := time.Hour
    options := keyfunc.Options{
        RefreshInterval: &refreshInterval,
        RefreshErrorHandler: func(err error) {
            log.Printf("There was an error with the jwt.KeyFunc\nError: %s", err.Error())
        },
    }

    // Create the JWKS from the resource at the given URL.
    jwks, err := keyfunc.Get(jwksURL, options)
    if err != nil {
        log.Fatalf("Failed to create JWKS from resource at the given URL.\nError: %s", err.Error())
    }

    // Get a JWT to parse.
    jwtB64 := "eyJhbGciOiJSUzI1NiIsImtpZCI6Ind5TXdLNEE2Q0w5UXcxMXVvZlZleVExMTlYeVgteHlreW1ra1h5Z1o1T00ifQ.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.OtVyCK0sE6Cuclg9VMD2AwLhqEyq2nv3a1bfxlzeS-bdu9KtYxcPSxJ6vxMcSSbMIIq9eEz9JFMU80zqgDPHBCjlOsC5SIPz7mm1Z3gCwq4zsFJ-2NIzYxA3p161ZRsPv_3bUyg9B_DPFyBoihgwWm6yrvrb4rmHXrDkjxpxCLPp3OeIpc_kb2t8r5HEQ5UBZPrsiScvuoVW13YwWpze59qBl_84n9xdmQ5pS7DklzkAVgqJT_NWBlb5uo6eW26HtJwHzss7xOIdQtcOtC1Gj3O82a55VJSQnsEEBeqG1ESb5Haq_hJgxYQnBssKydPCIxdZiye-0Ll9L8wWwpzwig"

    // Parse the JWT.
    token, err := jwt.Parse(jwtB64, jwks.KeyFunc)
    if err != nil {
        log.Fatalf("Failed to parse the JWT.\nError: %s", err.Error())
    }

    // Check if the token is valid.
    if !token.Valid {
        log.Fatalf("The token is not valid.")
    }

    log.Println("The token is valid.")
}

从 JWKS 作为 JSON

package main

import (
    "encoding/json"
    "log"

    "github.com/dgrijalva/jwt-go"

    "github.com/MicahParks/keyfunc"
)

func main() {

    // Get the JWKS as JSON.
    var jwksJSON json.RawMessage = []byte(`{"keys":[{"alg":"RS256","e":"AQAB","n":"ok6rvXu95337IxsDXrKzlIqw_I_zPDG8JyEw2CTOtNMoDi1QzpXQVMGj2snNEmvNYaCTmFf51I-EDgeFLLexr40jzBXlg72quV4aw4yiNuxkigW0gMA92OmaT2jMRIdDZM8mVokoxyPfLub2YnXHFq0XuUUgkX_TlutVhgGbyPN0M12teYZtMYo2AUzIRggONhHvnibHP0CPWDjCwSfp3On1Recn4DPxbn3DuGslF2myalmCtkujNcrhHLhwYPP-yZFb8e0XSNTcQvXaQxAqmnWH6NXcOtaeWMQe43PNTAyNinhndgI8ozG3Hz-1NzHssDH_yk6UYFSszhDbWAzyqw","kid":"wyMwK4A6CL9Qw11uofVeyQ119XyX-xykymkkXygZ5OM","kty":"RSA","use":"sig"},{"alg":"RS256","e":"AQAB","n":"nXv6FSAcMjuanQ2hIIUb8Vkqe94t98kPh2T8-0j6-Jq8pOclgKdtVeIZcBE9F_XiuJvg4b6WVs-uvA-pS8mmMvQ21xU5Q_37Cojv8v_QlHWETHwEJdXXiY2Xq5LgXDSwEhhdDZHSMQYDuvhp_P6nl2LNqqUvJkjoFWcnn2btgSIUQROIaDdxtx7_2h4oUi5u11BGSF2SZZiEpDAKT08Htv3uwXdwDA6ll99fbi8X8RmH5oY_tIZTeIzu50qHxElPewoYO8QrJYsO9oFcCPMHGxYWjXQEa-QZYgo0wS9zRIkeJc5kshc4-9Uhv2DVIjk_-ofGlML9ieggGyillBKptw","kid":"GRF55Lbzgg4sANCmER-sm55eX_qUOpY8UTptDmDG_6U","kty":"RSA","use":"sig"}]}`)

    // Create the JWKS from the resource at the given URL.
    jwks, err := keyfunc.New(jwksJSON)
    if err != nil {
        log.Fatalf("Failed to create JWKS from resource at the given URL.\nError: %s", err.Error())
    }

    // Get a JWT to parse.
    jwtB64 := "eyJhbGciOiJSUzI1NiIsImtpZCI6Ind5TXdLNEE2Q0w5UXcxMXVvZlZleVExMTlYeVgteHlreW1ra1h5Z1o1T00ifQ.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.OtVyCK0sE6Cuclg9VMD2AwLhqEyq2nv3a1bfxlzeS-bdu9KtYxcPSxJ6vxMcSSbMIIq9eEz9JFMU80zqgDPHBCjlOsC5SIPz7mm1Z3gCwq4zsFJ-2NIzYxA3p161ZRsPv_3bUyg9B_DPFyBoihgwWm6yrvrb4rmHXrDkjxpxCLPp3OeIpc_kb2t8r5HEQ5UBZPrsiScvuoVW13YwWpze59qBl_84n9xdmQ5pS7DklzkAVgqJT_NWBlb5uo6eW26HtJwHzss7xOIdQtcOtC1Gj3O82a55VJSQnsEEBeqG1ESb5Haq_hJgxYQnBssKydPCIxdZiye-0Ll9L8wWwpzwig"

    // Parse the JWT.
    token, err := jwt.Parse(jwtB64, jwks.KeyFunc)
    if err != nil {
        log.Fatalf("Failed to parse the JWT.\nError: %s", err.Error())
    }

    // Check if the token is valid.
    if !token.Valid {
        log.Fatalf("The token is not valid.")
    }

    log.Println("The token is valid.")
}
于 2021-03-11T00:43:29.107 回答
1

我遇到了一个非常相似的用例，我想在解析/解码后验证/验证访问令牌并从中提取字段（例如：、、、、、、iss等）。对于我的用例，我使用了 jwx和jwt-go lib。subaudexpiatjti

我已经尝试了@tim-cooper 示例，但它没有编译/使用最新的 API 版本，所以这里是对我有用的代码片段。

代码片段

去.mod
module my-go-module

go 1.16

require (
    github.com/dgrijalva/jwt-go v3.2.0+incompatible
    github.com/lestrrat-go/jwx v1.0.4
)
代码
package main

import (
    "errors"
    "fmt"

    "github.com/dgrijalva/jwt-go"
    "github.com/lestrrat-go/jwx/jwa"
    "github.com/lestrrat-go/jwx/jwk"
)

func main() {
    jwksURL := "https://your-tenant.auth0.com/.well-known/jwks.json"

    keySet, _ := jwk.Fetch(jwksURL)
    var accessToken = "eyJhbGciOiJSUzI1NiIsImtpZCI6Ind5TXdLNEE2Q0w5UXcxMXVvZlZleVExMTlYeVgteHlreW1ra1h5Z1o1T00ifQ.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.OtVyCK0sE6Cuclg9VMD2AwLhqEyq2nv3a1bfxlzeS-bdu9KtYxcPSxJ6vxMcSSbMIIq9eEz9JFMU80zqgDPHBCjlOsC5SIPz7mm1Z3gCwq4zsFJ-2NIzYxA3p161ZRsPv_3bUyg9B_DPFyBoihgwWm6yrvrb4rmHXrDkjxpxCLPp3OeIpc_kb2t8r5HEQ5UBZPrsiScvuoVW13YwWpze59qBl_84n9xdmQ5pS7DklzkAVgqJT_NWBlb5uo6eW26HtJwHzss7xOIdQtcOtC1Gj3O82a55VJSQnsEEBeqG1ESb5Haq_hJgxYQnBssKydPCIxdZiye-0Ll9L8wWwpzwig"
    token, err := verify(accessToken, keySet)
    if err != nil {
        fmt.Printf("Gor an error while verifiying access token: %v\n", err)
    }

    // Check if the token is valid.
    if !token.Valid {
        fmt.Println("The token is not valid.")
    }

    // Extract key value from the token and print them on console
    claims := token.Claims.(jwt.MapClaims)
    for key, value := range claims {
        fmt.Printf("%s\t%v\n", key, value)
    }
}

func verify(tokenString string, keySet *jwk.Set) (*jwt.Token, error) {
    tkn, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
        if token.Method.Alg() != jwa.RS256.String() { 
            return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
        }
        kid, ok := token.Header["kid"].(string)
        if !ok {
            return nil, errors.New("kid header not found")
        }
        keys := keySet.LookupKeyID(kid)
        if len(keys) == 0 {
            return nil, fmt.Errorf("key %v not found", kid)
        }
        var raw interface{}
        return raw, keys[0].Raw(&raw)
    })
    return tkn, err
}
于 2021-09-15T17:26:35.283 回答