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certificate-api
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Matthew 2020-12-11 00:18:06 -05:00
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README.md Normal file
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# Certificate API
## Library of Code sp-us | Board of Directors
This is an HTTP API which provides information on the x509 certificates deployed on TLS sites.
You can self-host this yourself, however you're more than welcome to use the public API at https://certapi.libraryofcode.org/
### How to Query
Send a GET request to `https://certapi.libraryofcode.org` with the query parameter `q` set to equal the site you wish to dial.
Ex: `https://certapi.libraryofcode.org/?q=www.google.com`
### Response & Types
#### Error
If the status !== `true`, there will be a message field which displays the error.
```ts
{
status: false,
message: string,
}
```
### 200 | SUCCESS
```ts
{
status: true | false,
subject: {
commonName: string,
organization: string[],
organizationalUnit: string[],
locality: string[],
country: string[],
},
issuer: {
commonName: string,
organization: string[],
organizationalUnit: string[],
locality: string[],
country: string[],
},
validationType: 'DV' | 'OV' | 'EV',
signatureAlgorithm: string,
publicKeyAlgorithm: string,
serialNumber: number,
notAfter: Date,
extendedKeyUsage: ['All/Any Usages', 'TLS Web Server Authentication', 'TLS Web Client Authentication', 'Code Signing', 'E-mail Protection (S/MIME)'],
san: string,
fingerprint: string,
}
```

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cmd/main.go Normal file
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package main
import (
"github.com/gin-gonic/gin"
"gitlab.libraryofcode.org/engineering/certificate-api/routes"
)
func main() {
router := gin.Default()
router.GET("/", routes.GetCertificateInfo)
router.Run(":3030")
}

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go.mod Normal file
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module gitlab.libraryofcode.org/engineering/certificate-api
go 1.14
require (
github.com/gin-gonic/gin v1.6.3
github.com/go-playground/validator/v10 v10.4.1 // indirect
github.com/golang/protobuf v1.4.3 // indirect
github.com/json-iterator/go v1.1.10 // indirect
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
github.com/modern-go/reflect2 v1.0.1 // indirect
github.com/ugorji/go v1.2.1 // indirect
golang.org/x/crypto v0.0.0-20201208171446-5f87f3452ae9 // indirect
golang.org/x/sys v0.0.0-20201211002650-1f0c578a6b29 // indirect
google.golang.org/protobuf v1.25.0 // indirect
gopkg.in/yaml.v2 v2.4.0 // indirect
)

132
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github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
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86
routes/get.go Normal file
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@ -0,0 +1,86 @@
package routes
import (
"crypto/sha1"
"crypto/tls"
"encoding/hex"
"fmt"
"github.com/gin-gonic/gin"
"net/http"
)
// GetCertificateInfo handler
func GetCertificateInfo(c *gin.Context) {
query := c.Query("q")
resp, err := tls.Dial("tcp", query+":443", &tls.Config{})
if err != nil {
fmt.Println(err)
c.JSON(http.StatusBadRequest, gin.H{
"status": false,
"message": "Could not establish connection with server.",
})
return
}
certificate := resp.ConnectionState().PeerCertificates[0]
var validationType string
for _, value := range certificate.PolicyIdentifiers {
if value.String() == "2.23.140.1.1" {
validationType = "EV"
} else if value.String() == "2.23.140.1.2.2" {
validationType = "OV"
} else if value.String() == "2.23.140.1.2.1" {
validationType = "DV"
}
}
extendedKeyUsages := []string{}
for _, value := range certificate.ExtKeyUsage {
switch value {
case 0:
extendedKeyUsages = append(extendedKeyUsages, "All/Any Usages")
break
case 1:
extendedKeyUsages = append(extendedKeyUsages, "TLS Web Server Authentication")
break
case 2:
extendedKeyUsages = append(extendedKeyUsages, "TLS Web Client Authentication")
break
case 3:
extendedKeyUsages = append(extendedKeyUsages, "Code Signing")
break
case 4:
extendedKeyUsages = append(extendedKeyUsages, "E-mail Protection (S/MIME)")
default:
break
}
}
sum := sha1.Sum(certificate.Raw)
c.JSON(http.StatusOK, gin.H{
"status": true,
"subject": gin.H{
"commonName": certificate.Subject.CommonName,
"organization": certificate.Subject.Organization,
"organizationalUnit": certificate.Subject.OrganizationalUnit,
"locality": certificate.Subject.Locality,
"country": certificate.Subject.Country,
},
"issuer": gin.H{
"commonName": certificate.Issuer.CommonName,
"organization": certificate.Issuer.Organization,
"organizationalUnit": certificate.Issuer.OrganizationalUnit,
"locality": certificate.Issuer.Locality,
"country": certificate.Issuer.Country,
},
"validationType": validationType,
"signatureAlgorithm": certificate.SignatureAlgorithm.String(),
"publicKeyAlgorithm": certificate.PublicKeyAlgorithm.String(),
"serialNumber": certificate.SerialNumber.Int64(),
"notAfter": certificate.NotAfter,
"extendedKeyUsage": extendedKeyUsages,
"san": certificate.DNSNames,
"fingerprint": hex.EncodeToString(sum[:]),
})
}