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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..3516c5d
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,52 @@
+PROJECT_NAME := go-fakessl
+BUILD_DIR := build
+GOFLAGS := -ldflags "-s -w" -trimpath
+GO_BUILD := go build $(GOFLAGS)
+.PHONY: all clean linux windows darwin tidy
+
+all: tidy linux windows darwin
+
+$(BUILD_DIR):
+	mkdir -p $(BUILD_DIR)
+
+tidy:
+	go mod tidy
+
+linux: linux-amd64 linux-386
+
+linux-amd64: $(BUILD_DIR)/$(PROJECT_NAME)-linux-amd64
+
+$(BUILD_DIR)/$(PROJECT_NAME)-linux-amd64: tidy | $(BUILD_DIR)
+	GOOS=linux GOARCH=amd64 $(GO_BUILD) -o $(BUILD_DIR)/$(PROJECT_NAME)-linux-amd64
+
+linux-386: $(BUILD_DIR)/$(PROJECT_NAME)-linux-386
+
+$(BUILD_DIR)/$(PROJECT_NAME)-linux-386: tidy | $(BUILD_DIR)
+	GOOS=linux GOARCH=386 $(GO_BUILD) -o $(BUILD_DIR)/$(PROJECT_NAME)-linux-386
+
+windows: windows-amd64 windows-386
+
+windows-amd64: $(BUILD_DIR)/$(PROJECT_NAME)-windows-amd64.exe
+
+$(BUILD_DIR)/$(PROJECT_NAME)-windows-amd64.exe: tidy | $(BUILD_DIR)
+	GOOS=windows GOARCH=amd64 $(GO_BUILD) -o $(BUILD_DIR)/$(PROJECT_NAME)-windows-amd64.exe
+
+windows-386: $(BUILD_DIR)/$(PROJECT_NAME)-windows-386.exe
+
+$(BUILD_DIR)/$(PROJECT_NAME)-windows-386.exe: tidy | $(BUILD_DIR)
+	GOOS=windows GOARCH=386 $(GO_BUILD) -o $(BUILD_DIR)/$(PROJECT_NAME)-windows-386.exe
+
+darwin: darwin-amd64 darwin-arm64
+
+darwin-amd64: $(BUILD_DIR)/$(PROJECT_NAME)-darwin-amd64
+
+$(BUILD_DIR)/$(PROJECT_NAME)-darwin-amd64: tidy | $(BUILD_DIR)
+	GOOS=darwin GOARCH=amd64 $(GO_BUILD) -o $(BUILD_DIR)/$(PROJECT_NAME)-darwin-amd64
+
+darwin-arm64: $(BUILD_DIR)/$(PROJECT_NAME)-darwin-arm64
+
+$(BUILD_DIR)/$(PROJECT_NAME)-darwin-arm64: tidy | $(BUILD_DIR)
+	GOOS=darwin GOARCH=arm64 $(GO_BUILD) -o $(BUILD_DIR)/$(PROJECT_NAME)-darwin-arm64
+
+clean:
+	rm -rf $(BUILD_DIR)
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..289bab7
--- /dev/null
+++ b/README.md
@@ -0,0 +1,96 @@
+# go-fakessl
+
+`go-fakessl` is a pentesting tool designed to clone SSL/TLS certificates from a target server and create a new, self-signed certificate using its public key. This tool can be used for testing SSL/TLS security and inspecting server certificates. It also allows you to run a local HTTPS server with the cloned certificate for testing purposes.
+
+> **WARNING**: This tool is for **authorized security testing only**. Unauthorized use may violate laws and regulations. The author and contributors are not responsible for misuse. Always obtain explicit permission before testing any system.
+
+## Features
+
+- **Clone SSL Certificates**: Clone SSL/TLS certificates from target servers by specifying their URL.
+- **Generate New Certificate and Key**: Create a new certificate using the cloned public key and a freshly generated RSA private key.
+- **Run HTTPS Server**: Start an HTTPS server locally using the cloned certificate for testing.
+- **Inspect Certificates**: Use `openssl` commands to inspect the original and cloned certificates.
+
+## Installation
+
+### Prerequisites
+
+- **Go**: Version 1.18 or later.
+- **OpenSSL**: For inspecting and comparing certificates.
+
+### Steps
+
+- Clone the repository:
+
+```
+$ git clone https://github.com/yourusername/go-fakessl.git
+$ cd go-fakessl
+```
+
+- Install dependencies:
+
+```
+$ go mod tidy
+```
+
+- Build for all platforms:
+
+```
+$ make all
+```
+
+- Binaries will be generated in the build/ directory for Linux, Windows, and macOS; alternatively, build for a specific platform:
+
+```
+$ make linux-amd64
+$ make windows-amd64
+$ make darwin-arm64
+```
+
+- (Optional) Run directly with Go:
+
+```
+$ go run main.go [-cert <cert> -key <key> -port <port] -url <url>
+```
+
+## Usage
+
+### Command-Line Flags
+
+```
+Usage of ./go-fakessl-<platform>-<arch>:
+  -cert string
+        path to certificate file to use for a test https server
+  -key string
+        path to key file to use for a test https server
+  -port string
+        port to use for a test https server (default "8000")
+  -url string
+        target https url to clone certificate from (e.g. https://google.com)
+```
+
+## Examples
+
+### Clone the SSL certificate of google.com
+
+```
+$ ./go-fakessl-linux-amd64 -url https://google.com
+url             cloned cert             private key
+google.com:443  google.com_clone.pem    google.com_clone.key
+
+[inf] start an https server to test cloned certificate with:
+$ ./go-fakessl-linux-amd64 -cert google.com_clone.pem -key google.com_clone.key -port 8000
+
+[inf] manually inspect and diff the original certificate and cloned certificate with:
+$ openssl s_client -connect google.com:443 </dev/null 2>/dev/null | openssl x509 -noout -text > google.com_original.txt
+$ openssl x509 -in google.com_clone.pem -noout -text > google.com_clone.pem_clone.txt
+$ diff *.txt
+```
+
+## License
+
+This project is licensed under the GNU GENERAL PUBLIC LICENSE. See the LICENSE file for details.
+
+## Disclaimer
+
+`go-fakessl` is provided "as is" without warranty. The author and contributors are not liable for any damages or legal consequences arising from its use. Use responsibly and only in authorized environments.
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..5eeed3c
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module go-fakessl
+
+go 1.23.4
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..8d9a57f
--- /dev/null
+++ b/main.go
@@ -0,0 +1,165 @@
+package main
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/pem"
+	"flag"
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+	"net/url"
+	"os"
+	"text/tabwriter"
+)
+
+func cloneCertificateTemplate(orig *x509.Certificate) *x509.Certificate {
+	return &x509.Certificate{
+		SerialNumber:          orig.SerialNumber,
+		SignatureAlgorithm:    orig.SignatureAlgorithm,
+		Issuer:                orig.Issuer,
+		Subject:               orig.Subject,
+		NotBefore:             orig.NotBefore,
+		NotAfter:              orig.NotAfter,
+		KeyUsage:              orig.KeyUsage,
+		ExtKeyUsage:           orig.ExtKeyUsage,
+		UnknownExtKeyUsage:    orig.UnknownExtKeyUsage,
+		BasicConstraintsValid: orig.BasicConstraintsValid,
+		IsCA:                  orig.IsCA,
+		MaxPathLen:            orig.MaxPathLen,
+		MaxPathLenZero:        orig.MaxPathLenZero,
+		DNSNames:              orig.DNSNames,
+		EmailAddresses:        orig.EmailAddresses,
+		IPAddresses:           orig.IPAddresses,
+		URIs:                  orig.URIs,
+		PolicyIdentifiers:     orig.PolicyIdentifiers,
+		CRLDistributionPoints: orig.CRLDistributionPoints,
+		OCSPServer:            orig.OCSPServer,
+		IssuingCertificateURL: orig.IssuingCertificateURL,
+		ExtraExtensions:       orig.Extensions,
+		SubjectKeyId:          orig.SubjectKeyId,
+		AuthorityKeyId:        orig.AuthorityKeyId,
+	}
+}
+
+func cloneCertificate(urlStr string) (certFilename, keyFilename string) {
+	writer := tabwriter.NewWriter(os.Stdout, 0, 8, 0, '\t', tabwriter.AlignRight)
+
+	parsedURL, err := url.Parse(urlStr)
+	if err != nil {
+		log.Fatalf("[err] invalid url: %v", err)
+	}
+
+	host := parsedURL.Host
+	if parsedURL.Port() == "" {
+		host = host + ":443"
+	}
+
+	domain := parsedURL.Host
+	if h, _, err := net.SplitHostPort(parsedURL.Host); err == nil {
+		domain = h
+	}
+
+	certFilename = domain + "_clone.pem"
+	keyFilename = domain + "_clone.key"
+
+	conn, err := tls.Dial("tcp", host, &tls.Config{InsecureSkipVerify: true})
+	if err != nil {
+		log.Fatalf("[err] failed to connect to %s: %v", host, err)
+	}
+	defer conn.Close()
+
+	state := conn.ConnectionState()
+	if len(state.PeerCertificates) == 0 {
+		log.Fatal("[err] no certificates found on the target server")
+	}
+	origCert := state.PeerCertificates[0]
+
+	template := cloneCertificateTemplate(origCert)
+
+	rsaKey, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		log.Fatalf("[err] failed to generate rsa key: %v", err)
+	}
+	priv := rsaKey
+	pub := &rsaKey.PublicKey
+
+	parent := cloneCertificateTemplate(origCert)
+	parent.Subject = origCert.Issuer
+
+	certDER, err := x509.CreateCertificate(rand.Reader, template, parent, pub, priv)
+	if err != nil {
+		log.Fatalf("[err] failed to create fake certificate: %v", err)
+	}
+
+	certOut, err := os.Create(certFilename)
+	if err != nil {
+		log.Fatalf("[err] failed to open %s for writing: %v", certFilename, err)
+	}
+	defer certOut.Close()
+	if err := pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: certDER}); err != nil {
+		log.Fatalf("[err] failed to write certificate: %v", err)
+	}
+
+	keyOut, err := os.Create(keyFilename)
+	if err != nil {
+		log.Fatalf("[err] failed to open %s for writing: %v", keyFilename, err)
+	}
+	defer keyOut.Close()
+	if err := pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(rsaKey)}); err != nil {
+		log.Fatalf("[err] failed to write private key: %v", err)
+	}
+
+	fmt.Fprintln(writer, "url\tcloned cert\tprivate key")
+	fmt.Fprintf(writer, "%s\t%s\t%s", host, certFilename, keyFilename)
+	writer.Flush()
+	fmt.Println()
+        fmt.Println()
+        fmt.Println("[inf] start an https server to test cloned certificate with:")
+        fmt.Printf("$ %s -cert %s -key %s -port 8000\n", os.Args[0], certFilename, keyFilename)
+	fmt.Println()
+	fmt.Println("[inf] manually inspect and diff the original certificate and cloned certificate with:")
+	fmt.Printf("$ openssl s_client -connect %s </dev/null 2>/dev/null | openssl x509 -noout -text > %s_original.txt\n", host, parsedURL.Host)
+	fmt.Printf("$ openssl x509 -in %s -noout -text > %s_clone.txt\n", certFilename, certFilename)
+	fmt.Println("$ diff *.txt")
+	return
+}
+
+func runHTTPSServer(certPath, keyPath string, portNumber string) {
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintln(w, "Hello, world!")
+	})
+	fmt.Printf("[inf] starting https server on https://127.0.0.1:%s\n", portNumber)
+        err := http.ListenAndServeTLS("127.0.0.1:"+portNumber, certPath, keyPath, nil)
+	if err != nil {
+		log.Fatalf("[err] failed to start httpsserver: %v", err)
+	}
+}
+
+func main() {
+	urlFlag := flag.String("url", "", "target https url to clone certificate from (e.g. https://google.com)")
+	certFlag := flag.String("cert", "", "path to certificate file to use for a test https server")
+	keyFlag := flag.String("key", "", "path to key file to use for a test https server")
+	portFlag := flag.String("port", "8000", "port to use for a test https server")
+	flag.Parse()
+
+	if *certFlag != "" || *keyFlag != "" {
+		if *certFlag == "" || *keyFlag == "" {
+			log.Fatal("[err] both -cert and -key must be supplied to run the HTTPS server")
+		}
+		runHTTPSServer(*certFlag, *keyFlag, *portFlag)
+		return
+	}
+
+	if *urlFlag != "" {
+		cloneCertificate(*urlFlag)
+		return
+	}
+
+        flag.Usage()
+        os.Exit(1)
+}
+