MINOR: ssl/ckch: certificates generation from "load" "crt-store" directive

Add "generate-dummy" on/off type keyword to "load" directive to
automatically generate dummy certificates as this is done for ACME from
ckch_conf_load_pem_or_generate() function which is called if a "crt"
keyword is also provide for this directive.

Also implement "keytype" to specify the key type used for these
certificates.  Only "RSA" or "ECDSA" is accepted. This patch also
implements "bits" keyword for the "load" directive to specify the
private key size used for RSA. For ECDSA, a new "curves" keyword is also
provided by this patch to specify the curves to be used for the EDCSA
private keys generation.

ckch_conf_load_pem_or_generate() is modified to use these parameters
provided by "keytype", "bits" and "curves" to generate the private key
with ssl_gen_EVP_PKEY() before generating the X509 certificate calling
ssl_gen_x509().

doc/configuration.txt

@@ -31870,6 +31870,30 @@ jwt [ off | on ]
   This option can be changed during runtime via the "add ssl jwt" and "del ssl
   jwt" CLI commands. See also "show ssl jwt" CLI command.
 
+generate-dummy [ off | on ]
+  Allow the generation of a private key and its self-signed certificate at
+  parsing time when set to 'on'. This may be useful if one does not have a
+  certificate at disposal during testing phase for instance. In this case,
+  "keytype", "bits" and "curves" may be used to customize the private key. When
+  not used, the default value is 'off'. (also see "keytype", "bits" and
+  "curves").
+
+keytype [ RSA | ECDSA ]
+  Allow the selection of the private key type used to generate at parsing time
+  a self-signed certificate. This is the case if "generate-dummy" is set to 'on'
+  for this certificate. When not used, the default is 'RSA'.
+  (also see "generate-dummy").
+
+bits <number>
+  Configure the number of bits to generate an RSA self-signed certificate when
+  "generate-dummy" is set to 'on' for this self-signed certificate and "keytype"
+  is set to 'RSA'. When not used, the default is 2048. (also see
+  "generate-dummy").
+
+curves <string>
+  Configure the curves when "generate-dummy" is set to 'on' and "keytype" is
+  set to 'ECDSA" for this self-signed certificate. The default is 'P-384'.
+
 12.8. ACME
 ----------
 

include/haproxy/ssl_ckch-t.h

@@ -73,6 +73,14 @@ struct ckch_conf {
 		char *id;
 		char **domains;
 	} acme;
+	struct {
+		struct {
+			char *type;   /* "RSA" or "ECSDA" */
+			int bits;     /* bits for RSA */
+			char *curves; /* NID of curves for ECDSA*/
+		} key;
+		int on;
+	} gencrt;
 };
 
 /*

src/ssl_ckch.c

@@ -36,6 +36,7 @@
 #include <haproxy/proxy.h>
 #include <haproxy/sc_strm.h>
 #include <haproxy/ssl_ckch.h>
+#include <haproxy/ssl_gencert.h>
 #include <haproxy/ssl_sock.h>
 #include <haproxy/ssl_ocsp.h>
 #include <haproxy/ssl_utils.h>
@@ -4782,18 +4783,69 @@ static int ckch_conf_load_pem_or_generate(void *value, char *buf, struct ckch_st
 
 #ifdef HAVE_ACME
 	errno = 0;
-	/* if ACME is enabled and the file does not exists, generate the PEM */
-	if (s->conf.acme.id && (stat(path, &sb) == -1 && errno == ENOENT)) {
-		/* generate they key and the certificate */
+	if (s->conf.gencrt.on != 1) {
+		if (s->conf.gencrt.key.type ||
+		    s->conf.gencrt.key.bits ||
+		    s->conf.gencrt.key.curves) {
+			memprintf(err, "keyword 'keytype', 'bits' and 'curves' require"
+			          " 'generate-dummy' set to 'on'\n");
+			err_code |= ERR_FATAL;
+			goto out;
+		}
+	}
+
+	if (s->conf.gencrt.on == 1) {
+		int type, bits, nid = -1;
+		char *curves;
+
+		if (!s->conf.gencrt.key.type)
+			type = EVP_PKEY_RSA;
+		else {
+			if (!strcmp(s->conf.gencrt.key.type, "RSA"))
+				type = EVP_PKEY_RSA;
+			else if (!strcmp(s->conf.gencrt.key.type, "ECDSA"))
+				type = EVP_PKEY_EC;
+			else {
+				memprintf(err, "keyword 'keytype' requires either 'RSA' or 'ECDSA'.");
+				err_code |= ERR_FATAL;
+				goto out;
+			}
+		}
+
+		/* default values: 2048 bits for RSA key, "P-384" curves for ECDSA key */
+		bits = s->conf.gencrt.key.bits ? s->conf.gencrt.key.bits : 2048;
+		curves = s->conf.gencrt.key.curves ? s->conf.gencrt.key.curves : "P-384";
+
+		if (type == EVP_PKEY_EC && (nid = curves2nid(curves)) == -1) {
+			memprintf(err, "unsupported curves '%s'.", s->conf.gencrt.key.curves);
+			err_code |= ERR_FATAL;
+			goto out;
+		}
+
+		s->data->key = ssl_gen_EVP_PKEY(type, nid, bits, err);
+		if (!s->data->key) {
+			err_code |= ERR_FATAL;
+			goto out;
+		}
+
+		s->data->cert = ssl_gen_x509(s->data->key);
+		if (!s->data->cert) {
+			memprintf(err, "Couldn't generate a keypair.");
+			err_code |= ERR_FATAL;
+			goto out;
+		}
+	}
+	else if (s->conf.acme.id && (stat(path, &sb) == -1 && errno == ENOENT)) {
+		/* if ACME is enabled and the file does not exists, generate the PEM */
 		ha_notice("No certificate available for '%s', generating a temporary key pair before getting the ACME certificate\n", path);
 		s->data->key = acme_gen_tmp_pkey();
 		s->data->cert = acme_gen_tmp_x509();
+
 		if (!s->data->key || !s->data->cert) {
 			memprintf(err, "Couldn't generate a temporary keypair for '%s'\n", path);
 			err_code |= ERR_FATAL;
 			goto out;
 		}
-
 	} else
 #endif
 	{
@@ -4852,6 +4904,10 @@ struct ckch_conf_kws ckch_conf_kws[] = {
 	{ "acme",         offsetof(struct ckch_conf, acme.id),          PARSE_TYPE_STR,   ckch_conf_acme_init,            },
 #endif
 	{ "domains",      offsetof(struct ckch_conf, acme.domains),     PARSE_TYPE_ARRAY_SUBSTR,   NULL,            },
+	{ "generate-dummy", offsetof(struct ckch_conf, gencrt.on),      PARSE_TYPE_ONOFF, NULL,                           },
+	{ "keytype",      offsetof(struct ckch_conf, gencrt.key.type),  PARSE_TYPE_STR,   NULL,                           },
+	{ "bits",         offsetof(struct ckch_conf, gencrt.key.bits),  PARSE_TYPE_INT,   NULL,                           },
+	{ "curves",       offsetof(struct ckch_conf, gencrt.key.curves), PARSE_TYPE_STR,  NULL,                           },
 	{ NULL,          -1,                                            PARSE_TYPE_STR,   NULL,                           }
 };