1 files changed, 313 insertions, 0 deletions

diff --git a/src/lib-dict-backend/dict-ldap-settings.c b/src/lib-dict-backend/dict-ldap-settings.c
new file mode 100644
index 0000000..01205eb
--- /dev/null
+++ b/src/lib-dict-backend/dict-ldap-settings.c
@@ -0,0 +1,313 @@
+/* Copyright (c) 2008-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+
+#if defined(BUILTIN_LDAP) || defined(PLUGIN_BUILD)
+
+#include "array.h"
+#include "str.h"
+#include "settings.h"
+#include "dict-ldap-settings.h"
+
+#include <ctype.h>
+
+static const char *dict_ldap_commonName = "cn";
+static const char *dict_ldap_empty_filter = "";
+
+enum section_type {
+	SECTION_ROOT = 0,
+	SECTION_MAP,
+	SECTION_FIELDS
+};
+
+struct dict_ldap_map_attribute {
+	const char *name;
+	const char *variable;
+};
+
+struct setting_parser_ctx {
+	pool_t pool;
+	struct dict_ldap_settings *set;
+	enum section_type type;
+
+	struct dict_ldap_map cur_map;
+	ARRAY(struct dict_ldap_map_attribute) cur_attributes;
+};
+
+#undef DEF_STR
+#undef DEF_BOOL
+#undef DEF_UINT
+
+#define DEF_STR(name) DEF_STRUCT_STR(name, dict_ldap_map)
+#define DEF_BOOL(name) DEF_STRUCT_BOOL(name, dict_ldap_map)
+#define DEF_UINT(name) DEF_STRUCT_UINT(name ,dict_ldap_map)
+
+static const struct setting_def dict_ldap_map_setting_defs[] = {
+	DEF_STR(pattern),
+	DEF_STR(filter),
+	DEF_STR(filter_iter),
+	DEF_STR(username_attribute),
+	DEF_STR(value_attribute),
+	DEF_STR(base_dn),
+	DEF_STR(scope),
+	{ 0, NULL, 0 }
+};
+
+static const char *pattern_read_name(const char **pattern)
+{
+	const char *p = *pattern, *name;
+
+	if (*p == '{') {
+		/* ${name} */
+		name = ++p;
+		p = strchr(p, '}');
+		if (p == NULL) {
+			/* error, but allow anyway */
+			*pattern += strlen(*pattern);
+			return "";
+		}
+		*pattern = p + 1;
+	} else {
+		/* $name - ends at the first non-alnum_ character */
+		name = p;
+		for (; *p != '\0'; p++) {
+			if (!i_isalnum(*p) && *p != '_')
+				break;
+		}
+		*pattern = p;
+	}
+	name = t_strdup_until(name, p);
+	return name;
+}
+
+static const char *dict_ldap_attributes_map(struct setting_parser_ctx *ctx)
+{
+	struct dict_ldap_map_attribute *attributes;
+	string_t *pattern;
+	const char *p, *name;
+	unsigned int i, count;
+
+	/* go through the variables in the pattern, replace them with plain
+	   '$' character and add its ldap attribute */
+	pattern = t_str_new(strlen(ctx->cur_map.pattern) + 1);
+	attributes = array_get_modifiable(&ctx->cur_attributes, &count);
+
+	p_array_init(&ctx->cur_map.ldap_attributes, ctx->pool, count);
+	for (p = ctx->cur_map.pattern; *p != '\0';) {
+		if (*p != '$') {
+			str_append_c(pattern, *p);
+			p++;
+			continue;
+		}
+		p++;
+		str_append_c(pattern, '$');
+
+		name = pattern_read_name(&p);
+		for (i = 0; i < count; i++) {
+			if (attributes[i].variable != NULL &&
+			    strcmp(attributes[i].variable, name) == 0)
+				break;
+		}
+		if (i == count) {
+			return t_strconcat("Missing LDAP attribute for variable: ",
+					   name, NULL);
+		}
+
+		/* mark this attribute as used */
+		attributes[i].variable = NULL;
+		array_push_back(&ctx->cur_map.ldap_attributes,
+				&attributes[i].name);
+	}
+
+	/* make sure there aren't any unused attributes */
+	for (i = 0; i < count; i++) {
+		if (attributes[i].variable != NULL) {
+			return t_strconcat("Unused variable: ",
+					   attributes[i].variable, NULL);
+		}
+	}
+
+	if (ctx->set->max_attribute_count < count)
+		ctx->set->max_attribute_count = count;
+	ctx->cur_map.pattern = p_strdup(ctx->pool, str_c(pattern));
+	return NULL;
+}
+
+static const char *dict_ldap_map_finish(struct setting_parser_ctx *ctx)
+{
+	if (ctx->cur_map.pattern == NULL)
+		return "Missing setting: pattern";
+	if (ctx->cur_map.filter == NULL)
+		ctx->cur_map.filter = dict_ldap_empty_filter;
+	if (*ctx->cur_map.filter != '\0') {
+		const char *ptr = ctx->cur_map.filter;
+		if (*ptr != '(')
+			return "Filter must start with (";
+		while(*ptr != '\0') ptr++;
+		ptr--;
+		if (*ptr != ')')
+			return "Filter must end with )";
+	}
+	if (ctx->cur_map.value_attribute == NULL)
+		return "Missing setting: value_attribute";
+
+	if (ctx->cur_map.username_attribute == NULL) {
+		/* default to commonName */
+		ctx->cur_map.username_attribute = dict_ldap_commonName;
+	}
+	if (ctx->cur_map.scope == NULL) {
+		ctx->cur_map.scope_val = 2; /* subtree */
+	} else {
+		if (strcasecmp(ctx->cur_map.scope, "one") == 0) ctx->cur_map.scope_val = 1;
+		else if (strcasecmp(ctx->cur_map.scope, "base") == 0) ctx->cur_map.scope_val = 0;
+		else if (strcasecmp(ctx->cur_map.scope, "subtree") == 0) ctx->cur_map.scope_val = 2;
+		else return "Scope must be one, base or subtree";
+	}
+	if (!array_is_created(&ctx->cur_map.ldap_attributes)) {
+		/* no attributes besides value. allocate the array anyway. */
+		p_array_init(&ctx->cur_map.ldap_attributes, ctx->pool, 1);
+		if (strchr(ctx->cur_map.pattern, '$') != NULL)
+			return "Missing attributes for pattern variables";
+	}
+	array_push_back(&ctx->set->maps, &ctx->cur_map);
+	i_zero(&ctx->cur_map);
+	return NULL;
+}
+
+static const char *
+parse_setting(const char *key, const char *value,
+	      struct setting_parser_ctx *ctx)
+{
+	struct dict_ldap_map_attribute *attribute;
+
+	switch (ctx->type) {
+	case SECTION_ROOT:
+		if (strcmp(key, "uri") == 0) {
+			ctx->set->uri = p_strdup(ctx->pool, value);
+			return NULL;
+		}
+		if (strcmp(key, "bind_dn") == 0) {
+			ctx->set->bind_dn = p_strdup(ctx->pool, value);
+			return NULL;
+		}
+		if (strcmp(key, "password") == 0) {
+			ctx->set->password = p_strdup(ctx->pool, value);
+			return NULL;
+		}
+		if (strcmp(key, "timeout") == 0) {
+			if (str_to_uint(value, &ctx->set->timeout) != 0) {
+				return "Invalid timeout value";
+			}
+			return NULL;
+		}
+		if (strcmp(key, "max_idle_time") == 0) {
+			if (str_to_uint(value, &ctx->set->max_idle_time) != 0) {
+				return "Invalid max_idle_time value";
+			}
+			return NULL;
+		}
+		if (strcmp(key, "debug") == 0) {
+			if (str_to_uint(value, &ctx->set->debug) != 0) {
+				return "invalid debug value";
+			}
+			return NULL;
+		}
+		if (strcmp(key, "tls") == 0) {
+			if (strcasecmp(value, "yes") == 0) {
+				ctx->set->require_ssl = TRUE;
+				ctx->set->start_tls = TRUE;
+			} else if (strcasecmp(value, "no") == 0) {
+				ctx->set->require_ssl = FALSE;
+				ctx->set->start_tls = FALSE;
+			} else if (strcasecmp(value, "try") == 0) {
+				ctx->set->require_ssl = FALSE;
+				ctx->set->start_tls = TRUE;
+			} else {
+				return "tls must be yes, try or no";
+			}
+			return NULL;
+		}
+		break;
+	case SECTION_MAP:
+		return parse_setting_from_defs(ctx->pool,
+					       dict_ldap_map_setting_defs,
+					       &ctx->cur_map, key, value);
+	case SECTION_FIELDS:
+		if (*value != '$') {
+			return t_strconcat("Value is missing '$' for attribute: ",
+					   key, NULL);
+		}
+		attribute = array_append_space(&ctx->cur_attributes);
+		attribute->name = p_strdup(ctx->pool, key);
+		attribute->variable = p_strdup(ctx->pool, value + 1);
+		return NULL;
+	}
+	return t_strconcat("Unknown setting: ", key, NULL);
+}
+
+static bool
+parse_section(const char *type, const char *name ATTR_UNUSED,
+	      struct setting_parser_ctx *ctx, const char **error_r)
+{
+	switch (ctx->type) {
+	case SECTION_ROOT:
+		if (type == NULL)
+			return FALSE;
+		if (strcmp(type, "map") == 0) {
+			array_clear(&ctx->cur_attributes);
+			ctx->type = SECTION_MAP;
+			return TRUE;
+		}
+		break;
+	case SECTION_MAP:
+		if (type == NULL) {
+			ctx->type = SECTION_ROOT;
+			*error_r = dict_ldap_map_finish(ctx);
+			return FALSE;
+		}
+		if (strcmp(type, "fields") == 0) {
+			ctx->type = SECTION_FIELDS;
+			return TRUE;
+		}
+		break;
+	case SECTION_FIELDS:
+		if (type == NULL) {
+			ctx->type = SECTION_MAP;
+			*error_r = dict_ldap_attributes_map(ctx);
+			return FALSE;
+		}
+		break;
+	}
+	*error_r = t_strconcat("Unknown section: ", type, NULL);
+	return FALSE;
+}
+
+struct dict_ldap_settings *
+dict_ldap_settings_read(pool_t pool, const char *path, const char **error_r)
+{
+	struct setting_parser_ctx ctx;
+
+	i_zero(&ctx);
+	ctx.pool = pool;
+	ctx.set = p_new(pool, struct dict_ldap_settings, 1);
+	t_array_init(&ctx.cur_attributes, 16);
+	p_array_init(&ctx.set->maps, pool, 8);
+
+	ctx.set->timeout = 30; /* default timeout */
+	ctx.set->require_ssl = FALSE; /* try to start SSL */
+	ctx.set->start_tls = TRUE;
+
+	if (!settings_read(path, NULL, parse_setting, parse_section,
+			   &ctx, error_r))
+		return NULL;
+
+	if (ctx.set->uri == NULL) {
+		*error_r = t_strdup_printf("Error in configuration file %s: "
+					   "Missing ldap uri", path);
+		return NULL;
+	}
+
+	return ctx.set;
+}
+
+#endif