3 files changed, 39 insertions, 0 deletions
diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index 88472fc90..0c5ecda98 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -2957,6 +2957,40 @@ ngx_ssl_get_serial_number(ngx_connection_t *c, ngx_pool_t *pool, ngx_str_t *s)
 
 
 ngx_int_t
+ngx_ssl_get_fingerprint(ngx_connection_t *c, ngx_pool_t *pool, ngx_str_t *s)
+{
+    X509          *cert;
+    unsigned int   len;
+    u_char         buf[EVP_MAX_MD_SIZE];
+
+    s->len = 0;
+
+    cert = SSL_get_peer_certificate(c->ssl->connection);
+    if (cert == NULL) {
+        return NGX_OK;
+    }
+
+    if (!X509_digest(cert, EVP_sha1(), buf, &len)) {
+        X509_free(cert);
+        return NGX_ERROR;
+    }
+
+    s->len = 2 * len;
+    s->data = ngx_pnalloc(pool, 2 * len);
+    if (s->data == NULL) {
+        X509_free(cert);
+        return NGX_ERROR;
+    }
+
+    ngx_hex_dump(s->data, buf, len);
+
+    X509_free(cert);
+
+    return NGX_OK;
+}
+
+
+ngx_int_t
 ngx_ssl_get_client_verify(ngx_connection_t *c, ngx_pool_t *pool, ngx_str_t *s)
 {
     X509  *cert;
diff --git a/src/event/ngx_event_openssl.h b/src/event/ngx_event_openssl.h
index 30c8a7409..d632eb274 100644
--- a/src/event/ngx_event_openssl.h
+++ b/src/event/ngx_event_openssl.h
@@ -173,6 +173,8 @@ ngx_int_t ngx_ssl_get_issuer_dn(ngx_connection_t *c, ngx_pool_t *pool,
     ngx_str_t *s);
 ngx_int_t ngx_ssl_get_serial_number(ngx_connection_t *c, ngx_pool_t *pool,
     ngx_str_t *s);
+ngx_int_t ngx_ssl_get_fingerprint(ngx_connection_t *c, ngx_pool_t *pool,
+    ngx_str_t *s);
 ngx_int_t ngx_ssl_get_client_verify(ngx_connection_t *c, ngx_pool_t *pool,
     ngx_str_t *s);
 
diff --git a/src/http/modules/ngx_http_ssl_module.c b/src/http/modules/ngx_http_ssl_module.c
index 60049e689..730204cbb 100644
--- a/src/http/modules/ngx_http_ssl_module.c
+++ b/src/http/modules/ngx_http_ssl_module.c
@@ -292,6 +292,9 @@ static ngx_http_variable_t  ngx_http_ssl_vars[] = {
     { ngx_string("ssl_client_serial"), NULL, ngx_http_ssl_variable,
       (uintptr_t) ngx_ssl_get_serial_number, NGX_HTTP_VAR_CHANGEABLE, 0 },
 
+    { ngx_string("ssl_client_fingerprint"), NULL, ngx_http_ssl_variable,
+      (uintptr_t) ngx_ssl_get_fingerprint, NGX_HTTP_VAR_CHANGEABLE, 0 },
+
     { ngx_string("ssl_client_verify"), NULL, ngx_http_ssl_variable,
       (uintptr_t) ngx_ssl_get_client_verify, NGX_HTTP_VAR_CHANGEABLE, 0 },