feat(esp_http_server): Allow the https server to request client certs optionally

Closes https://github.com/espressif/esp-idf/pull/17641
This commit is contained in:
0xFEEDC0DE64
2025-09-23 17:07:05 +02:00
committed by Ashish Sharma
parent 34587f3788
commit 813f3f27c7
23 changed files with 431 additions and 188 deletions

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@@ -2,4 +2,6 @@ idf_component_register(SRCS "main.c"
INCLUDE_DIRS "."
PRIV_REQUIRES esp_https_server esp_wifi nvs_flash esp_eth
EMBED_TXTFILES "certs/servercert.pem"
"certs/prvtkey.pem")
"certs/prvtkey.pem"
"certs/cacert.pem"
"certs/cakey.pem")

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@@ -2,7 +2,6 @@ menu "Example Configuration"
config EXAMPLE_ENABLE_HTTPS_USER_CALLBACK
bool "Enable user callback with HTTPS Server"
select ESP_TLS_SERVER_MIN_AUTH_MODE_OPTIONAL
help
Enable user callback for esp_https_server which can be used to get SSL context (connection information)
E.g. Certificate of the connected client
@@ -33,5 +32,14 @@ menu "Example Configuration"
default n
help
Enable HTTPS server custom ciphersuites
config EXAMPLE_ENABLE_SKIP_CLIENT_CERT
bool "Skip client certificate (WARNING: ONLY FOR TESTING PURPOSE, READ HELP)"
default n
select ESP_TLS_SERVER_MIN_AUTH_MODE_OPTIONAL
help
Allow clients to connect without providing a client certificate.
This is useful for testing purposes. When enabled, the server request
client certificates but does not require them for the connection to be established.
If a client certificate is provided, it will be verified.
endmenu

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@@ -0,0 +1,120 @@
# Certificate Generation Guide
This directory contains certificates for the HTTPS server example. This guide explains how to generate new server and client certificates signed by the existing CA certificate.
## Prerequisites
- OpenSSL installed on your system
- Existing CA certificate (`cacert.pem`) and CA private key (`cakey.pem`)
- Configuration files for certificate extensions (`server_cert.conf` and `client_cert.conf`)
## Generating Server Certificate
Follow these steps to create a new server certificate signed by the CA:
### 1. Generate Server Private Key
```bash
openssl genpkey -algorithm RSA -out new_server.key -pkeyopt rsa_keygen_bits:2048
```
This creates a 2048-bit RSA private key for the server.
### 2. Create Certificate Signing Request (CSR)
```bash
openssl req -new -key new_server.key -out new_server.csr -config server_cert.conf
```
This generates a CSR using the server's private key and the configuration specified in `server_cert.conf`.
### 3. Sign the Server Certificate with CA
```bash
openssl x509 -req -in new_server.csr -CA cacert.pem -CAkey cakey.pem -CAcreateserial -out new_server.pem -days 3650 -extensions v3_req -extfile server_cert.conf
```
This creates the server certificate (`new_server.pem`) valid for 10 years (3650 days), signed by the CA certificate.
## Generating Client Certificate
Follow these steps to create a new client certificate signed by the CA:
### 4. Generate Client Private Key
```bash
openssl genpkey -algorithm RSA -out new_client.key -pkeyopt rsa_keygen_bits:2048
```
This creates a 2048-bit RSA private key for the client.
### 5. Create Certificate Signing Request (CSR)
```bash
openssl req -new -key new_client.key -out new_client.csr -config client_cert.conf
```
This generates a CSR using the client's private key and the configuration specified in `client_cert.conf`.
### 6. Sign the Client Certificate with CA
```bash
openssl x509 -req -in new_client.csr -CA cacert.pem -CAkey cakey.pem -CAcreateserial -out new_client.pem -days 3650 -extensions v3_req -extfile client_cert.conf
```
This creates the client certificate (`new_client.pem`) valid for 10 years (3650 days), signed by the CA certificate.
## Installing the Certificates
### 7. Copy Certificates to Expected Locations
```bash
cp new_server.pem servercert.pem && \
cp new_server.key prvtkey.pem && \
cp new_client.pem client_cert.pem && \
cp new_client.key client_key.pem
```
This copies the newly generated certificates and keys to the filenames expected by the example application.
## File Naming Convention
The example application expects the following files:
- `servercert.pem` - Server certificate
- `prvtkey.pem` - Server private key
- `client_cert.pem` - Client certificate
- `client_key.pem` - Client private key
- `cacert.pem` - CA certificate (for verification)
## Security Notes
⚠️ **Important Security Considerations:**
- The private keys (`prvtkey.pem`, `client_key.pem`, `cakey.pem`) should be kept secure. As these are for demonstration purposes, they are included here, but in a production environment, ensure they are stored securely and access is restricted.
- The certificates in this example directory are for **demonstration purposes only**
- For production use, generate new certificates with appropriate security parameters
- Consider using shorter validity periods for production certificates
- Store private keys with restricted file permissions (e.g., `chmod 600`)
## Verifying Generated Certificates
You can verify the generated certificates using:
```bash
# Verify server certificate
openssl x509 -in servercert.pem -text -noout
# Verify client certificate
openssl x509 -in client_cert.pem -text -noout
# Verify certificate chain
openssl verify -CAfile cacert.pem servercert.pem
openssl verify -CAfile cacert.pem client_cert.pem
```
## Troubleshooting
- If certificate verification fails, ensure the CA certificate and key are valid and match
- Check that the configuration files (`server_cert.conf`, `client_cert.conf`) contain appropriate Subject Alternative Names (SANs) and extensions
- Ensure OpenSSL version is up to date for best compatibility

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@@ -0,0 +1,20 @@
-----BEGIN CERTIFICATE-----
MIIDOzCCAiOgAwIBAgIUG/S51QF4EeUkdaqg54oogqIKBZkwDQYJKoZIhvcNAQEL
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-----END CERTIFICATE-----

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@@ -0,0 +1,28 @@
-----BEGIN PRIVATE KEY-----
MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQCwYp7epz++0QkH
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v/t+MeGJP/0Zw8v/X2CFll96
-----END PRIVATE KEY-----

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@@ -0,0 +1,16 @@
[req]
distinguished_name = req_distinguished_name
req_extensions = v3_req
prompt = no
[req_distinguished_name]
C = SG
ST = SG
L = SG
O = ESP32 Client
CN = ESP32 Test Client
[v3_req]
basicConstraints = CA:FALSE
keyUsage = nonRepudiation, digitalSignature, keyEncipherment
extendedKeyUsage = clientAuth

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@@ -0,0 +1,21 @@
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----

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@@ -0,0 +1,28 @@
-----BEGIN PRIVATE KEY-----
MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQCxabpct6hrZ1W1
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-----END PRIVATE KEY-----

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@@ -1,28 +1,28 @@
-----BEGIN PRIVATE KEY-----
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KQYvvb0ZJIpqiPDH0Inq4D8U1AE0i16RlRteN6UB7avEP1v0SHFg1P2hTzWrwjZD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-----END PRIVATE KEY-----

View File

@@ -0,0 +1,20 @@
[req]
distinguished_name = req_distinguished_name
req_extensions = v3_req
prompt = no
[req_distinguished_name]
C = SG
ST = SG
L = SG
O = ESP32
CN = ESP32 HTTPS Server
[v3_req]
basicConstraints = CA:FALSE
keyUsage = nonRepudiation, digitalSignature, keyEncipherment
subjectAltName = @alt_names
[alt_names]
DNS.1 = esp32-server
DNS.2 = localhost

View File

@@ -1,20 +1,21 @@
-----BEGIN CERTIFICATE-----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MIIDhTCCAm2gAwIBAgIUeWALux8MJqS983GSSUHotYp9OxcwDQYJKoZIhvcNAQEL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-----END CERTIFICATE-----

View File

@@ -155,9 +155,19 @@ static httpd_handle_t start_webserver(void)
extern const unsigned char servercert_start[] asm("_binary_servercert_pem_start");
extern const unsigned char servercert_end[] asm("_binary_servercert_pem_end");
extern const unsigned char cacert_start[] asm("_binary_cacert_pem_start");
extern const unsigned char cacert_end[] asm("_binary_cacert_pem_end");
conf.servercert = servercert_start;
conf.servercert_len = servercert_end - servercert_start;
#if CONFIG_EXAMPLE_ENABLE_SKIP_CLIENT_CERT
conf.client_cert_authmode_optional = true;
#endif // EXAMPLE_ENABLE_SKIP_CLIENT_CERT
conf.cacert_pem = cacert_start;
conf.cacert_len = cacert_end - cacert_start;
extern const unsigned char prvtkey_pem_start[] asm("_binary_prvtkey_pem_start");
extern const unsigned char prvtkey_pem_end[] asm("_binary_prvtkey_pem_end");
conf.prvtkey_pem = prvtkey_pem_start;