/*
 *
 * Copyright (C) 2020 HAProxy Technologies, William Lallemand <wlallemand@haproxy.com>
 *
 * 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
 * 2 of the License, or (at your option) any later version.
 *
 */
#include <sys/stat.h>
#include <sys/types.h>

#include <dirent.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>

#include <import/ebpttree.h>
#include <import/ebsttree.h>

#include <haproxy/channel.h>
#include <haproxy/cli.h>
#include <haproxy/errors.h>
#include <haproxy/ssl_ckch.h>
#include <haproxy/ssl_crtlist.h>
#include <haproxy/ssl_sock.h>
#include <haproxy/stream_interface.h>
#include <haproxy/tools.h>


/* release ssl bind conf */
void ssl_sock_free_ssl_conf(struct ssl_bind_conf *conf)
{
	if (conf) {
#if defined(OPENSSL_NPN_NEGOTIATED) && !defined(OPENSSL_NO_NEXTPROTONEG)
		free(conf->npn_str);
		conf->npn_str = NULL;
#endif
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
		free(conf->alpn_str);
		conf->alpn_str = NULL;
#endif
		free(conf->ca_file);
		conf->ca_file = NULL;
		free(conf->ca_verify_file);
		conf->ca_verify_file = NULL;
		free(conf->crl_file);
		conf->crl_file = NULL;
		free(conf->ciphers);
		conf->ciphers = NULL;
#if (HA_OPENSSL_VERSION_NUMBER >= 0x10101000L)
		free(conf->ciphersuites);
		conf->ciphersuites = NULL;
#endif
		free(conf->curves);
		conf->curves = NULL;
		free(conf->ecdhe);
		conf->ecdhe = NULL;
	}
}

/*
 * Allocate and copy a ssl_bind_conf structure
 */
struct ssl_bind_conf *crtlist_dup_ssl_conf(struct ssl_bind_conf *src)
{
	struct ssl_bind_conf *dst;

	if (!src)
		return NULL;

	dst = calloc(1, sizeof(*dst));
	if (!dst)
		return NULL;

#if defined(OPENSSL_NPN_NEGOTIATED) && !defined(OPENSSL_NO_NEXTPROTONEG)
	if (src->npn_str) {
		dst->npn_str = strdup(src->npn_str);
		if (!dst->npn_str)
			goto error;
	}
#endif
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
	if (src->alpn_str) {
		dst->alpn_str = strdup(src->alpn_str);
		if (!dst->alpn_str)
			goto error;
	}
#endif
	if (src->ca_file) {
		dst->ca_file = strdup(src->ca_file);
		if (!dst->ca_file)
			goto error;
	}
	if (src->ca_verify_file) {
		dst->ca_verify_file = strdup(src->ca_verify_file);
		if (!dst->ca_verify_file)
			goto error;
	}
	if (src->crl_file) {
		dst->crl_file = strdup(src->crl_file);
		if (!dst->crl_file)
			goto error;
	}
	if (src->ciphers) {
		dst->ciphers = strdup(src->ciphers);
		if (!dst->ciphers)
			goto error;
	}
#if (HA_OPENSSL_VERSION_NUMBER >= 0x10101000L)
	if (src->ciphersuites) {
		dst->ciphersuites = strdup(src->ciphersuites);
		if (!dst->ciphersuites)
			goto error;
	}
#endif
	if (src->curves) {
		dst->curves = strdup(src->curves);
		if (!dst->curves)
			goto error;
	}
	if (src->ecdhe) {
		dst->ecdhe = strdup(src->ecdhe);
		if (!dst->ecdhe)
			goto error;
	}
	return dst;

error:
	ssl_sock_free_ssl_conf(dst);
	free(dst);

	return NULL;
}

/* free sni filters */
void crtlist_free_filters(char **args)
{
	int i;

	if (!args)
		return;

	for (i = 0; args[i]; i++)
		free(args[i]);

	free(args);
}

/* Alloc and duplicate a char ** array */
char **crtlist_dup_filters(char **args, int fcount)
{
	char **dst;
	int i;

	if (fcount == 0)
		return NULL;

	dst = calloc(fcount + 1, sizeof(*dst));
	if (!dst)
		return NULL;

	for (i = 0; i < fcount; i++) {
		dst[i] = strdup(args[i]);
		if (!dst[i])
			goto error;
	}
	return dst;

error:
	crtlist_free_filters(dst);
	return NULL;
}

/*
 * Detach and free a crtlist_entry.
 * Free the filters, the ssl_conf and call ckch_inst_free() for each ckch_inst
 */
void crtlist_entry_free(struct crtlist_entry *entry)
{
	struct ckch_inst *inst, *inst_s;

	if (entry == NULL)
		return;

	ebpt_delete(&entry->node);
	LIST_DEL(&entry->by_crtlist);
	LIST_DEL(&entry->by_ckch_store);
	crtlist_free_filters(entry->filters);
	ssl_sock_free_ssl_conf(entry->ssl_conf);
	free(entry->ssl_conf);
	list_for_each_entry_safe(inst, inst_s, &entry->ckch_inst, by_crtlist_entry) {
		ckch_inst_free(inst);
	}
	free(entry);
}
/*
 * Duplicate a crt_list entry and its content (ssl_conf, filters/fcount)
 * Return a pointer to the new entry
 */
struct crtlist_entry *crtlist_entry_dup(struct crtlist_entry *src)
{
	struct crtlist_entry *entry;

	if (src == NULL)
		return NULL;

	entry = crtlist_entry_new();
	if (entry == NULL)
		return NULL;

	if (src->filters) {
		entry->filters = crtlist_dup_filters(src->filters, src->fcount);
		if (!entry->filters)
			goto error;
	}
	entry->fcount = src->fcount;
	if (src->ssl_conf) {
		entry->ssl_conf = crtlist_dup_ssl_conf(src->ssl_conf);
		if (!entry->ssl_conf)
			goto error;
	}
	entry->crtlist = src->crtlist;

	return entry;

error:

	crtlist_free_filters(entry->filters);
	ssl_sock_free_ssl_conf(entry->ssl_conf);
	free(entry->ssl_conf);
	free(entry);

	return NULL;
}

/*
 * Allocate and initialize a crtlist_entry
 */
struct crtlist_entry *crtlist_entry_new()
{
	struct crtlist_entry *entry;

	entry = calloc(1, sizeof(*entry));
	if (entry == NULL)
		return NULL;

	LIST_INIT(&entry->ckch_inst);

	/* initialize the nodes so we can LIST_DEL in any cases */
	LIST_INIT(&entry->by_crtlist);
	LIST_INIT(&entry->by_ckch_store);

	return entry;
}

/* Free a crtlist, from the crt_entry to the content of the ssl_conf */
void crtlist_free(struct crtlist *crtlist)
{
	struct crtlist_entry *entry, *s_entry;
	struct bind_conf_list *bind_conf_node;

	if (crtlist == NULL)
		return;

	bind_conf_node = crtlist->bind_conf;
	while (bind_conf_node) {
		struct bind_conf_list *next = bind_conf_node->next;
		free(bind_conf_node);
		bind_conf_node = next;
	}

	list_for_each_entry_safe(entry, s_entry, &crtlist->ord_entries, by_crtlist) {
		crtlist_entry_free(entry);
	}
	ebmb_delete(&crtlist->node);
	free(crtlist);
}

/* Alloc and initialize a struct crtlist
 * <filename> is the key of the ebmb_node
 * <unique> initialize the list of entries to be unique (1) or not (0)
 */
struct crtlist *crtlist_new(const char *filename, int unique)
{
	struct crtlist *newlist;

	newlist = calloc(1, sizeof(*newlist) + strlen(filename) + 1);
	if (newlist == NULL)
		return NULL;

	memcpy(newlist->node.key, filename, strlen(filename) + 1);
	if (unique)
		newlist->entries = EB_ROOT_UNIQUE;
	else
		newlist->entries = EB_ROOT;

	LIST_INIT(&newlist->ord_entries);

	return newlist;
}

/*
 *  Read a single crt-list line. /!\ alter the <line> string.
 *  Fill <crt_path> and <crtlist_entry>
 *  <crtlist_entry> must be alloc and free by the caller
 *  <crtlist_entry->ssl_conf> is alloc by the function
 *  <crtlist_entry->filters> is alloc by the function
 *  <crt_path> is a ptr in <line>
 *  Return an error code
 */
int crtlist_parse_line(char *line, char **crt_path, struct crtlist_entry *entry, const char *file, int linenum, char **err)
{
	int cfgerr = 0;
	int arg, newarg, cur_arg, i, ssl_b = 0, ssl_e = 0;
	char *end;
	char *args[MAX_CRT_ARGS + 1];
	struct ssl_bind_conf *ssl_conf = NULL;

	if (!line || !crt_path || !entry)
		return ERR_ALERT | ERR_FATAL;

	end = line + strlen(line);
	if (end-line >= CRT_LINESIZE-1 && *(end-1) != '\n') {
		/* Check if we reached the limit and the last char is not \n.
		 * Watch out for the last line without the terminating '\n'!
		 */
		memprintf(err, "parsing [%s:%d]: line too long, limit is %d characters",
		          file, linenum, CRT_LINESIZE-1);
		cfgerr |= ERR_ALERT | ERR_FATAL;
		goto error;
	}
	arg = 0;
	newarg = 1;
	while (*line) {
		if (isspace((unsigned char)*line)) {
			newarg = 1;
			*line = 0;
		} else if (*line == '[') {
			if (ssl_b) {
				memprintf(err, "parsing [%s:%d]: too many '['", file, linenum);
				cfgerr |= ERR_ALERT | ERR_FATAL;
				goto error;
			}
			if (!arg) {
				memprintf(err, "parsing [%s:%d]: file must start with a cert", file, linenum);
				cfgerr |= ERR_ALERT | ERR_FATAL;
				goto error;
			}
			ssl_b = arg;
			newarg = 1;
			*line = 0;
		} else if (*line == ']') {
			if (ssl_e) {
				memprintf(err, "parsing [%s:%d]: too many ']'", file, linenum);
				cfgerr |= ERR_ALERT | ERR_FATAL;
				goto error;
			}
			if (!ssl_b) {
				memprintf(err, "parsing [%s:%d]: missing '['", file, linenum);
				cfgerr |= ERR_ALERT | ERR_FATAL;
				goto error;
			}
			ssl_e = arg;
			newarg = 1;
			*line = 0;
		} else if (newarg) {
			if (arg == MAX_CRT_ARGS) {
				memprintf(err, "parsing [%s:%d]: too many args ", file, linenum);
				cfgerr |= ERR_ALERT | ERR_FATAL;
				goto error;
			}
			newarg = 0;
			args[arg++] = line;
		}
		line++;
	}
	args[arg++] = line;

	/* empty line */
	if (!*args[0]) {
		cfgerr |= ERR_NONE;
		goto error;
	}

	*crt_path = args[0];

	if (ssl_b) {
		ssl_conf = calloc(1, sizeof *ssl_conf);
		if (!ssl_conf) {
			memprintf(err, "not enough memory!");
			cfgerr |= ERR_ALERT | ERR_FATAL;
			goto error;
		}
	}
	cur_arg = ssl_b ? ssl_b : 1;
	while (cur_arg < ssl_e) {
		newarg = 0;
		for (i = 0; ssl_bind_kws[i].kw != NULL; i++) {
			if (strcmp(ssl_bind_kws[i].kw, args[cur_arg]) == 0) {
				newarg = 1;
				cfgerr |= ssl_bind_kws[i].parse(args, cur_arg, NULL, ssl_conf, err);
				if (cur_arg + 1 + ssl_bind_kws[i].skip > ssl_e) {
					memprintf(err, "parsing [%s:%d]: ssl args out of '[]' for %s",
					          file, linenum, args[cur_arg]);
					cfgerr |= ERR_ALERT | ERR_FATAL;
					goto error;
				}
				cur_arg += 1 + ssl_bind_kws[i].skip;
				break;
			}
		}
		if (!cfgerr && !newarg) {
			memprintf(err, "parsing [%s:%d]: unknown ssl keyword %s",
				  file, linenum, args[cur_arg]);
			cfgerr |= ERR_ALERT | ERR_FATAL;
			goto error;
		}
	}
	entry->linenum = linenum;
	entry->ssl_conf = ssl_conf;
	entry->filters = crtlist_dup_filters(&args[cur_arg], arg - cur_arg - 1);
	entry->fcount = arg - cur_arg - 1;

	return cfgerr;

error:
	crtlist_free_filters(entry->filters);
	entry->filters = NULL;
	ssl_sock_free_ssl_conf(entry->ssl_conf);
	free(entry->ssl_conf);
	entry->ssl_conf = NULL;
	return cfgerr;
}


/* This function parse a crt-list file and store it in a struct crtlist, each line is a crtlist_entry structure
 * Fill the <crtlist> argument with a pointer to a new crtlist struct
 *
 * This function tries to open and store certificate files.
 */
int crtlist_parse_file(char *file, struct bind_conf *bind_conf, struct proxy *curproxy, struct crtlist **crtlist, char **err)
{
	struct crtlist *newlist;
	struct crtlist_entry *entry = NULL;
	char thisline[CRT_LINESIZE];
	char path[MAXPATHLEN+1];
	FILE *f;
	struct stat buf;
	int linenum = 0;
	int cfgerr = 0;
	int missing_lf = -1;

	if ((f = fopen(file, "r")) == NULL) {
		memprintf(err, "cannot open file '%s' : %s", file, strerror(errno));
		return ERR_ALERT | ERR_FATAL;
	}

	newlist = crtlist_new(file, 0);
	if (newlist == NULL) {
		memprintf(err, "Not enough memory!");
		cfgerr |= ERR_ALERT | ERR_FATAL;
		goto error;
	}

	while (fgets(thisline, sizeof(thisline), f) != NULL) {
		char *end;
		char *line = thisline;
		char *crt_path;
		struct ckch_store *ckchs;

		if (missing_lf != -1) {
			memprintf(err, "parsing [%s:%d]: Stray NUL character at position %d.\n",
			          file, linenum, (missing_lf + 1));
			cfgerr |= ERR_ALERT | ERR_FATAL;
			missing_lf = -1;
			break;
		}

		linenum++;
		end = line + strlen(line);
		if (end-line == sizeof(thisline)-1 && *(end-1) != '\n') {
			/* Check if we reached the limit and the last char is not \n.
			 * Watch out for the last line without the terminating '\n'!
			 */
			memprintf(err, "parsing [%s:%d]: line too long, limit is %d characters",
				  file, linenum, (int)sizeof(thisline)-1);
			cfgerr |= ERR_ALERT | ERR_FATAL;
			break;
		}

		if (*line == '#' || *line == '\n' || *line == '\r')
			continue;

		if (end > line && *(end-1) == '\n') {
			/* kill trailing LF */
			*(end - 1) = 0;
		}
		else {
			/* mark this line as truncated */
			missing_lf = end - line;
		}

		entry = crtlist_entry_new();
		if (entry == NULL) {
			memprintf(err, "Not enough memory!");
			cfgerr |= ERR_ALERT | ERR_FATAL;
			goto error;
		}

		cfgerr |= crtlist_parse_line(thisline, &crt_path, entry, file, linenum, err);
		if (cfgerr & ERR_CODE)
			goto error;

		/* empty line */
		if (!crt_path || !*crt_path) {
			crtlist_entry_free(entry);
			entry = NULL;
			continue;
		}

		if (*crt_path != '/' && global_ssl.crt_base) {
			if ((strlen(global_ssl.crt_base) + 1 + strlen(crt_path)) > MAXPATHLEN) {
				memprintf(err, "parsing [%s:%d]: '%s' : path too long",
					  file, linenum, crt_path);
				cfgerr |= ERR_ALERT | ERR_FATAL;
				goto error;
			}
			snprintf(path, sizeof(path), "%s/%s",  global_ssl.crt_base, crt_path);
			crt_path = path;
		}

		/* Look for a ckch_store or create one */
		ckchs = ckchs_lookup(crt_path);
		if (ckchs == NULL) {
			if (stat(crt_path, &buf) == 0) {

				ckchs = ckchs_load_cert_file(crt_path, err);
				if (ckchs == NULL) {
					cfgerr |= ERR_ALERT | ERR_FATAL;
					goto error;
				}

				entry->node.key = ckchs;
				entry->crtlist = newlist;
				ebpt_insert(&newlist->entries, &entry->node);
				LIST_ADDQ(&newlist->ord_entries, &entry->by_crtlist);
				LIST_ADDQ(&ckchs->crtlist_entry, &entry->by_ckch_store);

			} else {
				/* If we didn't find the file, this could be a
				bundle, since 2.3 we don't support multiple
				certificate in the same OpenSSL store, so we
				emulate it by loading each file separately. To
				do so we need to duplicate the entry in the
				crt-list because it becomes independent */
				char fp[MAXPATHLEN+1] = {0};
				int n = 0;
				struct crtlist_entry *entry_dup = entry; /* use the previous created entry */
				for (n = 0; n < SSL_SOCK_NUM_KEYTYPES; n++) {
					struct stat buf;
					int ret;

					ret = snprintf(fp, sizeof(fp), "%s.%s", path, SSL_SOCK_KEYTYPE_NAMES[n]);
					if (ret > sizeof(fp))
						continue;

					ckchs = ckchs_lookup(fp);
					if (!ckchs && stat(fp, &buf) == 0) {

						ckchs = ckchs_load_cert_file(fp, err);
						if (ckchs == NULL) {
							cfgerr |= ERR_ALERT | ERR_FATAL;
							goto error;
						}

						linenum++; /* we duplicate the line for this entry in the bundle */
						if (!entry_dup) { /* if the entry was used, duplicate one */
							linenum++;
							entry_dup = crtlist_entry_dup(entry);
							if (!entry_dup) {
								cfgerr |= ERR_ALERT | ERR_FATAL;
								goto error;
							}
							entry_dup->linenum = linenum;
						}

						entry_dup->node.key = ckchs;
						entry_dup->crtlist = newlist;
						ebpt_insert(&newlist->entries, &entry_dup->node);
						LIST_ADDQ(&newlist->ord_entries, &entry_dup->by_crtlist);
						LIST_ADDQ(&ckchs->crtlist_entry, &entry_dup->by_ckch_store);

						entry_dup = NULL; /* the entry was used, we need a new one next round */
					}
				}
			}
		}
		entry = NULL;
	}

	if (missing_lf != -1) {
		memprintf(err, "parsing [%s:%d]: Missing LF on last line, file might have been truncated at position %d.\n",
		          file, linenum, (missing_lf + 1));
		cfgerr |= ERR_ALERT | ERR_FATAL;
	}

	if (cfgerr & ERR_CODE)
		goto error;

	newlist->linecount = linenum;

	fclose(f);
	*crtlist = newlist;

	return cfgerr;
error:
	crtlist_entry_free(entry);

	fclose(f);
	crtlist_free(newlist);
	return cfgerr;
}

/* This function reads a directory and stores it in a struct crtlist, each file is a crtlist_entry structure
 * Fill the <crtlist> argument with a pointer to a new crtlist struct
 *
 * This function tries to open and store certificate files.
 */
int crtlist_load_cert_dir(char *path, struct bind_conf *bind_conf, struct crtlist **crtlist, char **err)
{
	struct crtlist *dir;
	struct dirent **de_list;
	int i, n;
	struct stat buf;
	char *end;
	char fp[MAXPATHLEN+1];
	int cfgerr = 0;
	struct ckch_store *ckchs;

	dir = crtlist_new(path, 1);
	if (dir == NULL) {
		memprintf(err, "not enough memory");
		return ERR_ALERT | ERR_FATAL;
	}

	n = scandir(path, &de_list, 0, alphasort);
	if (n < 0) {
		memprintf(err, "%sunable to scan directory '%s' : %s.\n",
			  err && *err ? *err : "", path, strerror(errno));
		cfgerr |= ERR_ALERT | ERR_FATAL;
	}
	else {
		for (i = 0; i < n; i++) {
			struct crtlist_entry *entry;
			struct dirent *de = de_list[i];

			end = strrchr(de->d_name, '.');
			if (end && (!strcmp(end, ".issuer") || !strcmp(end, ".ocsp") || !strcmp(end, ".sctl") || !strcmp(end, ".key")))
				goto ignore_entry;

			snprintf(fp, sizeof(fp), "%s/%s", path, de->d_name);
			if (stat(fp, &buf) != 0) {
				memprintf(err, "%sunable to stat SSL certificate from file '%s' : %s.\n",
					  err && *err ? *err : "", fp, strerror(errno));
				cfgerr |= ERR_ALERT | ERR_FATAL;
				goto ignore_entry;
			}
			if (!S_ISREG(buf.st_mode))
				goto ignore_entry;

			entry = crtlist_entry_new();
			if (entry == NULL) {
				memprintf(err, "not enough memory '%s'", fp);
				cfgerr |= ERR_ALERT | ERR_FATAL;
				goto ignore_entry;
			}

			ckchs = ckchs_lookup(fp);
			if (ckchs == NULL)
				ckchs = ckchs_load_cert_file(fp, err);
			if (ckchs == NULL) {
				free(de);
				free(entry);
				cfgerr |= ERR_ALERT | ERR_FATAL;
				goto end;
			}
			entry->node.key = ckchs;
			entry->crtlist = dir;
			LIST_ADDQ(&ckchs->crtlist_entry, &entry->by_ckch_store);
			LIST_ADDQ(&dir->ord_entries, &entry->by_crtlist);
			ebpt_insert(&dir->entries, &entry->node);

ignore_entry:
			free(de);
		}
end:
		free(de_list);
	}

	if (cfgerr & ERR_CODE) {
		/* free the dir and entries on error */
		crtlist_free(dir);
	} else {
		*crtlist = dir;
	}
	return cfgerr;

}

/*
 * Take an ssl_bind_conf structure and append the configuration line used to
 * create it in the buffer
 */
static void dump_crtlist_sslconf(struct buffer *buf, const struct ssl_bind_conf *conf)
{
	int space = 0;

	if (conf == NULL)
		return;

	chunk_appendf(buf, " [");
#ifdef OPENSSL_NPN_NEGOTIATED
	if (conf->npn_str) {
		int len = conf->npn_len;
		char *ptr = conf->npn_str;
		int comma = 0;

		if (space) chunk_appendf(buf, " ");
		chunk_appendf(buf, "npn ");
		while (len) {
			unsigned short size;

			size = *ptr;
			ptr++;
			if (comma)
				chunk_memcat(buf, ",", 1);
			chunk_memcat(buf, ptr, size);
			ptr += size;
			len -= size + 1;
			comma = 1;
		}
		chunk_memcat(buf, "", 1); /* finish with a \0 */
		space++;
	}
#endif
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
	if (conf->alpn_str) {
		int len = conf->alpn_len;
		char *ptr = conf->alpn_str;
		int comma = 0;

		if (space) chunk_appendf(buf, " ");
		chunk_appendf(buf, "alpn ");
		while (len) {
			unsigned short size;

			size = *ptr;
			ptr++;
			if (comma)
				chunk_memcat(buf, ",", 1);
			chunk_memcat(buf, ptr, size);
			ptr += size;
			len -= size + 1;
			comma = 1;
		}
		chunk_memcat(buf, "", 1); /* finish with a \0 */
		space++;
	}
#endif
	/* verify */
	{
		if (conf->verify == SSL_SOCK_VERIFY_NONE) {
			if (space) chunk_appendf(buf, " ");
			chunk_appendf(buf, "verify none");
			space++;
		} else if (conf->verify == SSL_SOCK_VERIFY_OPTIONAL) {
			if (space) chunk_appendf(buf, " ");
			chunk_appendf(buf, "verify optional");
			space++;
		} else if (conf->verify == SSL_SOCK_VERIFY_REQUIRED) {
			if (space) chunk_appendf(buf, " ");
			chunk_appendf(buf, "verify required");
			space++;
		}
	}

	if (conf->no_ca_names) {
		if (space) chunk_appendf(buf, " ");
		chunk_appendf(buf, "no-ca-names");
		space++;
	}

	if (conf->early_data) {
		if (space) chunk_appendf(buf, " ");
		chunk_appendf(buf, "allow-0rtt");
		space++;
	}
	if (conf->ca_file) {
		if (space) chunk_appendf(buf, " ");
		chunk_appendf(buf, "ca-file %s", conf->ca_file);
		space++;
	}
	if (conf->crl_file) {
		if (space) chunk_appendf(buf, " ");
		chunk_appendf(buf, "crl-file %s", conf->crl_file);
		space++;
	}
	if (conf->ciphers) {
		if (space) chunk_appendf(buf, " ");
		chunk_appendf(buf, "ciphers %s", conf->ciphers);
		space++;
	}
#if (HA_OPENSSL_VERSION_NUMBER >= 0x10101000L && !defined OPENSSL_IS_BORINGSSL && !defined LIBRESSL_VERSION_NUMBER)
	if (conf->ciphersuites) {
		if (space) chunk_appendf(buf, " ");
		chunk_appendf(buf, "ciphersuites %s", conf->ciphersuites);
		space++;
	}
#endif
	if (conf->curves) {
		if (space) chunk_appendf(buf, " ");
		chunk_appendf(buf, "curves %s", conf->curves);
		space++;
	}
	if (conf->ecdhe) {
		if (space) chunk_appendf(buf, " ");
		chunk_appendf(buf, "ecdhe %s", conf->ecdhe);
		space++;
	}

	/* the crt-lists only support ssl-min-ver and ssl-max-ver */
	if (conf->ssl_methods_cfg.min) {
		if (space) chunk_appendf(buf, " ");
		chunk_appendf(buf, "ssl-min-ver %s", methodVersions[conf->ssl_methods_cfg.min].name);
		space++;
	}

	if (conf->ssl_methods_cfg.max) {
		if (space) chunk_appendf(buf, " ");
		chunk_appendf(buf, "ssl-max-ver %s", methodVersions[conf->ssl_methods_cfg.max].name);
		space++;
	}

	chunk_appendf(buf, "]");

	return;
}

/* dump a list of filters */
static void dump_crtlist_filters(struct buffer *buf, struct crtlist_entry *entry)
{
	int i;

	if (!entry->fcount)
		return;

	for (i = 0; i < entry->fcount; i++) {
		chunk_appendf(buf, " %s", entry->filters[i]);
	}
	return;
}

/************************** CLI functions ****************************/


/* CLI IO handler for '(show|dump) ssl crt-list' */
static int cli_io_handler_dump_crtlist(struct appctx *appctx)
{
	struct buffer *trash = alloc_trash_chunk();
	struct stream_interface *si = appctx->owner;
	struct ebmb_node *lnode;

	if (trash == NULL)
		return 1;

	/* dump the list of crt-lists */
	lnode = appctx->ctx.cli.p1;
	if (lnode == NULL)
		lnode = ebmb_first(&crtlists_tree);
	while (lnode) {
		chunk_appendf(trash, "%s\n", lnode->key);
		if (ci_putchk(si_ic(si), trash) == -1) {
			si_rx_room_blk(si);
			goto yield;
		}
		lnode = ebmb_next(lnode);
	}
	free_trash_chunk(trash);
	return 1;
yield:
	appctx->ctx.cli.p1 = lnode;
	free_trash_chunk(trash);
	return 0;
}

/* CLI IO handler for '(show|dump) ssl crt-list <filename>' */
static int cli_io_handler_dump_crtlist_entries(struct appctx *appctx)
{
	struct buffer *trash = alloc_trash_chunk();
	struct crtlist *crtlist;
	struct stream_interface *si = appctx->owner;
	struct crtlist_entry *entry;

	if (trash == NULL)
		return 1;

	crtlist = ebmb_entry(appctx->ctx.cli.p0, struct crtlist, node);

	entry = appctx->ctx.cli.p1;
	if (entry == NULL) {
		entry = LIST_ELEM((crtlist->ord_entries).n, typeof(entry), by_crtlist);
		chunk_appendf(trash, "# %s\n", crtlist->node.key);
		if (ci_putchk(si_ic(si), trash) == -1) {
			si_rx_room_blk(si);
			goto yield;
		}
	}

	list_for_each_entry_from(entry, &crtlist->ord_entries, by_crtlist) {
		struct ckch_store *store;
		const char *filename;

		store = entry->node.key;
		filename = store->path;
		chunk_appendf(trash, "%s", filename);
		if (appctx->ctx.cli.i0 == 's') /* show */
			chunk_appendf(trash, ":%d", entry->linenum);
		dump_crtlist_sslconf(trash, entry->ssl_conf);
		dump_crtlist_filters(trash, entry);
		chunk_appendf(trash, "\n");

		if (ci_putchk(si_ic(si), trash) == -1) {
			si_rx_room_blk(si);
			goto yield;
		}
	}
	free_trash_chunk(trash);
	return 1;
yield:
	appctx->ctx.cli.p1 = entry;
	free_trash_chunk(trash);
	return 0;
}

/* CLI argument parser for '(show|dump) ssl crt-list' */
static int cli_parse_dump_crtlist(char **args, char *payload, struct appctx *appctx, void *private)
{
	struct ebmb_node *lnode;
	char *filename = NULL;
	int mode;
	char *end;

	if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
		return 1;

	appctx->ctx.cli.p0 = NULL;
	appctx->ctx.cli.p1 = NULL;

	if (*args[3] && !strcmp(args[3], "-n")) {
		mode = 's';
		filename = args[4];
	} else {
		mode = 'd';
		filename = args[3];
	}

	if (mode == 's' && !*args[4])
		return cli_err(appctx, "'show ssl crt-list -n' expects a filename or a directory\n");

	if (filename && *filename) {


		/* strip trailing slashes, including first one */
		for (end = filename + strlen(filename) - 1; end >= filename && *end == '/'; end--)
			*end = 0;

		lnode = ebst_lookup(&crtlists_tree, filename);
		if (lnode == NULL)
			return cli_err(appctx, "didn't find the specified filename\n");

		appctx->ctx.cli.p0 = lnode;
		appctx->io_handler = cli_io_handler_dump_crtlist_entries;
	}
	appctx->ctx.cli.i0 = mode;

	return 0;
}

/* release function of the  "add ssl crt-list' command, free things and unlock
 the spinlock */
static void cli_release_add_crtlist(struct appctx *appctx)
{
	struct crtlist_entry *entry = appctx->ctx.cli.p1;

	if (appctx->st2 != SETCERT_ST_FIN) {
		struct ckch_inst *inst, *inst_s;
		/* upon error free the ckch_inst and everything inside */
		ebpt_delete(&entry->node);
		LIST_DEL(&entry->by_crtlist);
		LIST_DEL(&entry->by_ckch_store);

		list_for_each_entry_safe(inst, inst_s, &entry->ckch_inst, by_ckchs) {
			ckch_inst_free(inst);
		}
		crtlist_free_filters(entry->filters);
		ssl_sock_free_ssl_conf(entry->ssl_conf);
		free(entry->ssl_conf);
		free(entry);
	}

	HA_SPIN_UNLOCK(CKCH_LOCK, &ckch_lock);
}


/* IO Handler for the "add ssl crt-list" command It adds a new entry in the
 * crt-list and generates the ckch_insts for each bind_conf that uses this crt-list
 *
 * The logic is the same as the "commit ssl cert" command but without the
 * freeing of the old structures, because there are none.
 */
static int cli_io_handler_add_crtlist(struct appctx *appctx)
{
	struct bind_conf_list *bind_conf_node;
	struct stream_interface *si = appctx->owner;
	struct crtlist *crtlist = appctx->ctx.cli.p0;
	struct crtlist_entry *entry = appctx->ctx.cli.p1;
	struct ckch_store *store = entry->node.key;
	struct buffer *trash = alloc_trash_chunk();
	struct ckch_inst *new_inst;
	char *err = NULL;
	int i = 0;
	int errcode = 0;

	if (trash == NULL)
		goto error;

	/* for each bind_conf which use the crt-list, a new ckch_inst must be
	 * created.
	 */
	if (unlikely(si_ic(si)->flags & (CF_WRITE_ERROR|CF_SHUTW)))
		goto error;

	while (1) {
		switch (appctx->st2) {
			case SETCERT_ST_INIT:
				/* This state just print the update message */
				chunk_printf(trash, "Inserting certificate '%s' in crt-list '%s'", store->path, crtlist->node.key);
				if (ci_putchk(si_ic(si), trash) == -1) {
					si_rx_room_blk(si);
					goto yield;
				}
				appctx->st2 = SETCERT_ST_GEN;
				/* fallthrough */
			case SETCERT_ST_GEN:
				bind_conf_node = appctx->ctx.cli.p2; /* get the previous ptr from the yield */
				if (bind_conf_node == NULL)
					bind_conf_node = crtlist->bind_conf;
				for (; bind_conf_node; bind_conf_node = bind_conf_node->next) {
					struct bind_conf *bind_conf = bind_conf_node->bind_conf;
					struct sni_ctx *sni;

					/* yield every 10 generations */
					if (i > 10) {
						appctx->ctx.cli.p2 = bind_conf_node;
						goto yield;
					}

					/* we don't support multi-cert bundles, only simple ones */
					errcode |= ckch_inst_new_load_store(store->path, store, bind_conf, entry->ssl_conf, entry->filters, entry->fcount, &new_inst, &err);
					if (errcode & ERR_CODE)
						goto error;

					/* we need to initialize the SSL_CTX generated */
					/* this iterate on the newly generated SNIs in the new instance to prepare their SSL_CTX */
					list_for_each_entry(sni, &new_inst->sni_ctx, by_ckch_inst) {
						if (!sni->order) { /* we initialized only the first SSL_CTX because it's the same in the other sni_ctx's */
							errcode |= ssl_sock_prepare_ctx(bind_conf, new_inst->ssl_conf, sni->ctx, &err);
							if (errcode & ERR_CODE)
								goto error;
						}
					}
					/* display one dot for each new instance */
					chunk_appendf(trash, ".");
					i++;
					LIST_ADDQ(&store->ckch_inst, &new_inst->by_ckchs);
					LIST_ADDQ(&entry->ckch_inst, &new_inst->by_crtlist_entry);
					new_inst->crtlist_entry = entry;
				}
				appctx->st2 = SETCERT_ST_INSERT;
				/* fallthrough */
			case SETCERT_ST_INSERT:
				/* insert SNIs in bind_conf */
				list_for_each_entry(new_inst, &store->ckch_inst, by_ckchs) {
					HA_RWLOCK_WRLOCK(SNI_LOCK, &new_inst->bind_conf->sni_lock);
					ssl_sock_load_cert_sni(new_inst, new_inst->bind_conf);
					HA_RWLOCK_WRUNLOCK(SNI_LOCK, &new_inst->bind_conf->sni_lock);
				}
				entry->linenum = ++crtlist->linecount;
				appctx->st2 = SETCERT_ST_FIN;
				goto end;
		}
	}

end:
	chunk_appendf(trash, "\n");
	if (errcode & ERR_WARN)
		chunk_appendf(trash, "%s", err);
	chunk_appendf(trash, "Success!\n");
	if (ci_putchk(si_ic(si), trash) == -1)
		si_rx_room_blk(si);
	free_trash_chunk(trash);
	/* success: call the release function and don't come back */
	return 1;
yield:
	/* store the state */
	if (ci_putchk(si_ic(si), trash) == -1)
		si_rx_room_blk(si);
	free_trash_chunk(trash);
	si_rx_endp_more(si); /* let's come back later */
	return 0; /* should come back */

error:
	/* spin unlock and free are done in the release function */
	if (trash) {
		chunk_appendf(trash, "\n%sFailed!\n", err);
		if (ci_putchk(si_ic(si), trash) == -1)
			si_rx_room_blk(si);
		free_trash_chunk(trash);
	}
	/* error: call the release function and don't come back */
	return 1;
}


/*
 * Parse a "add ssl crt-list <crt-list> <certfile>" line.
 * Filters and option must be passed through payload:
 */
static int cli_parse_add_crtlist(char **args, char *payload, struct appctx *appctx, void *private)
{
	int cfgerr = 0;
	struct ckch_store *store;
	char *err = NULL;
	char path[MAXPATHLEN+1];
	char *crtlist_path;
	char *cert_path = NULL;
	struct ebmb_node *eb;
	struct ebpt_node *inserted;
	struct crtlist *crtlist;
	struct crtlist_entry *entry = NULL;
	char *end;

	if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
		return 1;

	if (!*args[3] || (!payload && !*args[4]))
		return cli_err(appctx, "'add ssl crtlist' expects a filename and a certificate name\n");

	crtlist_path = args[3];

	/* strip trailing slashes, including first one */
	for (end = crtlist_path + strlen(crtlist_path) - 1; end >= crtlist_path && *end == '/'; end--)
		*end = 0;

	if (HA_SPIN_TRYLOCK(CKCH_LOCK, &ckch_lock))
		return cli_err(appctx, "Operations on certificates are currently locked!\n");

	eb = ebst_lookup(&crtlists_tree, crtlist_path);
	if (!eb) {
		memprintf(&err, "crt-list '%s' does not exist!", crtlist_path);
		goto error;
	}
	crtlist = ebmb_entry(eb, struct crtlist, node);

	entry = crtlist_entry_new();
	if (entry == NULL) {
		memprintf(&err, "Not enough memory!");
		goto error;
	}

	if (payload) {
		char *lf;

		lf = strrchr(payload, '\n');
		if (lf) {
			memprintf(&err, "only one line of payload is supported!");
			goto error;
		}
		/* cert_path is filled here */
		cfgerr |= crtlist_parse_line(payload, &cert_path, entry, "CLI", 1, &err);
		if (cfgerr & ERR_CODE)
			goto error;
	} else {
		cert_path = args[4];
	}

	if (!cert_path) {
		memprintf(&err, "'add ssl crtlist' should contain the certificate name in the payload");
		cfgerr |= ERR_ALERT | ERR_FATAL;
		goto error;
	}

	if (eb_gettag(crtlist->entries.b[EB_RGHT])) {
		char *slash;

		slash = strrchr(cert_path, '/');
		if (!slash) {
			memprintf(&err, "'%s' is a directory, certificate path '%s' must contain the directory path", (char *)crtlist->node.key, cert_path);
			goto error;
		}
		/* temporary replace / by 0 to do an strcmp */
		*slash = '\0';
		if (strcmp(cert_path, (char*)crtlist->node.key) != 0) {
			*slash = '/';
			memprintf(&err, "'%s' is a directory, certificate path '%s' must contain the directory path", (char *)crtlist->node.key, cert_path);
			goto error;
		}
		*slash = '/';
	}

	if (*cert_path != '/' && global_ssl.crt_base) {
		if ((strlen(global_ssl.crt_base) + 1 + strlen(cert_path)) > MAXPATHLEN) {
			memprintf(&err, "'%s' : path too long", cert_path);
			cfgerr |= ERR_ALERT | ERR_FATAL;
			goto error;
		}
		snprintf(path, sizeof(path), "%s/%s",  global_ssl.crt_base, cert_path);
		cert_path = path;
	}

	store = ckchs_lookup(cert_path);
	if (store == NULL) {
		memprintf(&err, "certificate '%s' does not exist!", cert_path);
		goto error;
	}
	if (store->ckch == NULL || store->ckch->cert == NULL) {
		memprintf(&err, "certificate '%s' is empty!", cert_path);
		goto error;
	}

	/* check if it's possible to insert this new crtlist_entry */
	entry->node.key = store;
	inserted = ebpt_insert(&crtlist->entries, &entry->node);
	if (inserted != &entry->node) {
		memprintf(&err, "file already exists in this directory!");
		goto error;
	}

	/* this is supposed to be a directory (EB_ROOT_UNIQUE), so no ssl_conf are allowed */
	if ((entry->ssl_conf || entry->filters) && eb_gettag(crtlist->entries.b[EB_RGHT])) {
		memprintf(&err, "this is a directory, SSL configuration and filters are not allowed");
		goto error;
	}

	LIST_ADDQ(&crtlist->ord_entries, &entry->by_crtlist);
	entry->crtlist = crtlist;
	LIST_ADDQ(&store->crtlist_entry, &entry->by_ckch_store);

	appctx->st2 = SETCERT_ST_INIT;
	appctx->ctx.cli.p0 = crtlist;
	appctx->ctx.cli.p1 = entry;

	/* unlock is done in the release handler */
	return 0;

error:
	crtlist_entry_free(entry);
	HA_SPIN_UNLOCK(CKCH_LOCK, &ckch_lock);
	err = memprintf(&err, "Can't edit the crt-list: %s\n", err ? err : "");
	return cli_dynerr(appctx, err);
}

/* Parse a "del ssl crt-list <crt-list> <certfile>" line. */
static int cli_parse_del_crtlist(char **args, char *payload, struct appctx *appctx, void *private)
{
	struct ckch_store *store;
	char *err = NULL;
	char *crtlist_path, *cert_path;
	struct ebmb_node *ebmb;
	struct ebpt_node *ebpt;
	struct crtlist *crtlist;
	struct crtlist_entry *entry = NULL;
	struct ckch_inst *inst, *inst_s;
	int linenum = 0;
	char *colons;
	char *end;

	if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
		return 1;

	if (!*args[3] || !*args[4])
		return cli_err(appctx, "'del ssl crtlist' expects a filename and a certificate name\n");

	if (HA_SPIN_TRYLOCK(CKCH_LOCK, &ckch_lock))
		return cli_err(appctx, "Can't delete!\nOperations on certificates are currently locked!\n");

	crtlist_path = args[3];
	cert_path = args[4];

	colons = strchr(cert_path, ':');
	if (colons) {
		char *endptr;

		linenum = strtol(colons + 1, &endptr, 10);
		if (colons + 1 == endptr || *endptr != '\0') {
			memprintf(&err, "wrong line number after colons in '%s'!", cert_path);
			goto error;
		}
		*colons = '\0';
	}

	/* strip trailing slashes, including first one */
	for (end = crtlist_path + strlen(crtlist_path) - 1; end >= crtlist_path && *end == '/'; end--)
		*end = 0;

	/* look for crtlist */
	ebmb = ebst_lookup(&crtlists_tree, crtlist_path);
	if (!ebmb) {
		memprintf(&err, "crt-list '%s' does not exist!", crtlist_path);
		goto error;
	}
	crtlist = ebmb_entry(ebmb, struct crtlist, node);

	/* look for store */
	store = ckchs_lookup(cert_path);
	if (store == NULL) {
		memprintf(&err, "certificate '%s' does not exist!", cert_path);
		goto error;
	}
	if (store->ckch == NULL || store->ckch->cert == NULL) {
		memprintf(&err, "certificate '%s' is empty!", cert_path);
		goto error;
	}

	ebpt = ebpt_lookup(&crtlist->entries, store);
	if (!ebpt) {
		memprintf(&err, "certificate '%s' can't be found in crt-list '%s'!", cert_path, crtlist_path);
		goto error;
	}

	/* list the line number of entries for errors in err, and select the right ebpt */
	for (; ebpt; ebpt = ebpt_next_dup(ebpt)) {
		struct crtlist_entry *tmp;

		tmp = ebpt_entry(ebpt, struct crtlist_entry, node);
		memprintf(&err, "%s%s%d", err ? err : "", err ? ", " : "", tmp->linenum);

		/* select the entry we wanted */
		if (linenum == 0 || tmp->linenum == linenum) {
			if (!entry)
				entry = tmp;
		}
	}

	/* we didn't found the specified entry */
	if (!entry) {
		memprintf(&err, "found a certificate '%s' but the line number is incorrect, please specify a correct line number preceded by colons (%s)!", cert_path, err ? err : NULL);
		goto error;
	}

	/* we didn't specified a line number but there were several entries */
	if (linenum == 0 && ebpt_next_dup(&entry->node)) {
		memprintf(&err, "found the certificate '%s' in several entries, please specify a line number preceded by colons (%s)!", cert_path, err ? err : NULL);
		goto error;
	}

	/* upon error free the ckch_inst and everything inside */

	ebpt_delete(&entry->node);
	LIST_DEL(&entry->by_crtlist);
	LIST_DEL(&entry->by_ckch_store);

	list_for_each_entry_safe(inst, inst_s, &entry->ckch_inst, by_crtlist_entry) {
		struct sni_ctx *sni, *sni_s;

		HA_RWLOCK_WRLOCK(SNI_LOCK, &inst->bind_conf->sni_lock);
		list_for_each_entry_safe(sni, sni_s, &inst->sni_ctx, by_ckch_inst) {
			ebmb_delete(&sni->name);
			LIST_DEL(&sni->by_ckch_inst);
			SSL_CTX_free(sni->ctx);
			free(sni);
		}
		HA_RWLOCK_WRUNLOCK(SNI_LOCK, &inst->bind_conf->sni_lock);
		LIST_DEL(&inst->by_ckchs);
		free(inst);
	}

	crtlist_free_filters(entry->filters);
	ssl_sock_free_ssl_conf(entry->ssl_conf);
	free(entry->ssl_conf);
	free(entry);

	HA_SPIN_UNLOCK(CKCH_LOCK, &ckch_lock);
	err = memprintf(&err, "Entry '%s' deleted in crtlist '%s'!\n", cert_path, crtlist_path);
	return cli_dynmsg(appctx, LOG_NOTICE, err);

error:
	HA_SPIN_UNLOCK(CKCH_LOCK, &ckch_lock);
	err = memprintf(&err, "Can't delete the entry: %s\n", err ? err : "");
	return cli_dynerr(appctx, err);
}


/* unlink and free all crt-list and crt-list entries */
void crtlist_deinit()
{
	struct eb_node *node, *next;
	struct crtlist *crtlist;

	node = eb_first(&crtlists_tree);
	while (node) {
		next = eb_next(node);
		crtlist = ebmb_entry(node, struct crtlist, node);
		crtlist_free(crtlist);
		node = next;
	}
}


/* register cli keywords */
static struct cli_kw_list cli_kws = {{ },{
	{ { "add", "ssl", "crt-list", NULL }, "add ssl crt-list <filename> <certfile> [options] : add a line <certfile> to a crt-list <filename>", cli_parse_add_crtlist, cli_io_handler_add_crtlist, cli_release_add_crtlist },
	{ { "del", "ssl", "crt-list", NULL }, "del ssl crt-list <filename> <certfile[:line]> : delete a line <certfile> in a crt-list <filename>", cli_parse_del_crtlist, NULL, NULL },
	{ { "show", "ssl", "crt-list", NULL }, "show ssl crt-list [-n] [<filename>] : show the list of crt-lists or the content of a crt-list <filename>", cli_parse_dump_crtlist, cli_io_handler_dump_crtlist, NULL },
	{ { NULL }, NULL, NULL, NULL } }
};

INITCALL1(STG_REGISTER, cli_register_kw, &cli_kws);