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auth-request-var-expand.c
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auth-request-var-expand.c
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/* Copyright (c) 2002-2016 Dovecot authors, see the included COPYING file */
#include "auth-common.h"
#include "str.h"
#include "strescape.h"
#include "auth-request.h"
struct auth_request_var_expand_ctx {
struct auth_request *auth_request;
auth_request_escape_func_t *escape_func;
};
const struct var_expand_table
auth_request_var_expand_static_tab[AUTH_REQUEST_VAR_TAB_COUNT+1] = {
{ 'u', NULL, "user" },
{ 'n', NULL, "username" },
{ 'd', NULL, "domain" },
{ 's', NULL, "service" },
{ 'h', NULL, "home" },
{ 'l', NULL, "lip" },
{ 'r', NULL, "rip" },
{ 'p', NULL, "pid" },
{ 'w', NULL, "password" },
{ '!', NULL, NULL },
{ 'm', NULL, "mech" },
{ 'c', NULL, "secured" },
{ 'a', NULL, "lport" },
{ 'b', NULL, "rport" },
{ 'k', NULL, "cert" },
{ '\0', NULL, "login_user" },
{ '\0', NULL, "login_username" },
{ '\0', NULL, "login_domain" },
{ '\0', NULL, "session" },
{ '\0', NULL, "real_lip" },
{ '\0', NULL, "real_rip" },
{ '\0', NULL, "real_lport" },
{ '\0', NULL, "real_rport" },
{ '\0', NULL, "domain_first" },
{ '\0', NULL, "domain_last" },
{ '\0', NULL, "master_user" },
{ '\0', NULL, "session_pid" },
{ '\0', NULL, "orig_user" },
{ '\0', NULL, "orig_username" },
{ '\0', NULL, "orig_domain" },
{ '\0', NULL, "auth_user" },
{ '\0', NULL, "auth_username" },
{ '\0', NULL, "auth_domain" },
/* be sure to update AUTH_REQUEST_VAR_TAB_COUNT */
{ '\0', NULL, NULL }
};
static const char *
escape_none(const char *string,
const struct auth_request *request ATTR_UNUSED)
{
return string;
}
const char *
auth_request_str_escape(const char *string,
const struct auth_request *request ATTR_UNUSED)
{
return str_escape(string);
}
struct var_expand_table *
auth_request_get_var_expand_table_full(const struct auth_request *auth_request,
auth_request_escape_func_t *escape_func,
unsigned int *count)
{
const unsigned int auth_count =
N_ELEMENTS(auth_request_var_expand_static_tab);
struct var_expand_table *tab, *ret_tab;
const char *orig_user, *auth_user;
if (escape_func == NULL)
escape_func = escape_none;
/* keep the extra fields at the beginning. the last static_tab field
contains the ending NULL-fields. */
tab = ret_tab = t_malloc((*count + auth_count) * sizeof(*tab));
memset(tab, 0, *count * sizeof(*tab));
tab += *count;
*count += auth_count;
memcpy(tab, auth_request_var_expand_static_tab,
auth_count * sizeof(*tab));
tab[0].value = escape_func(auth_request->user, auth_request);
tab[1].value = escape_func(t_strcut(auth_request->user, '@'),
auth_request);
tab[2].value = strchr(auth_request->user, '@');
if (tab[2].value != NULL)
tab[2].value = escape_func(tab[2].value+1, auth_request);
tab[3].value = escape_func(auth_request->service, auth_request);
/* tab[4] = we have no home dir */
if (auth_request->local_ip.family != 0)
tab[5].value = net_ip2addr(&auth_request->local_ip);
if (auth_request->remote_ip.family != 0)
tab[6].value = net_ip2addr(&auth_request->remote_ip);
tab[7].value = dec2str(auth_request->client_pid);
if (auth_request->mech_password != NULL) {
tab[8].value = escape_func(auth_request->mech_password,
auth_request);
}
if (auth_request->userdb_lookup) {
tab[9].value = auth_request->userdb == NULL ? "" :
dec2str(auth_request->userdb->userdb->id);
} else {
tab[9].value = auth_request->passdb == NULL ? "" :
dec2str(auth_request->passdb->passdb->id);
}
tab[10].value = auth_request->mech_name == NULL ? "" :
escape_func(auth_request->mech_name, auth_request);
tab[11].value = auth_request->secured ? "secured" : "";
tab[12].value = dec2str(auth_request->local_port);
tab[13].value = dec2str(auth_request->remote_port);
tab[14].value = auth_request->valid_client_cert ? "valid" : "";
if (auth_request->requested_login_user != NULL) {
const char *login_user = auth_request->requested_login_user;
tab[15].value = escape_func(login_user, auth_request);
tab[16].value = escape_func(t_strcut(login_user, '@'),
auth_request);
tab[17].value = strchr(login_user, '@');
if (tab[17].value != NULL) {
tab[17].value = escape_func(tab[17].value+1,
auth_request);
}
}
tab[18].value = auth_request->session_id == NULL ? NULL :
escape_func(auth_request->session_id, auth_request);
if (auth_request->real_local_ip.family != 0)
tab[19].value = net_ip2addr(&auth_request->real_local_ip);
if (auth_request->real_remote_ip.family != 0)
tab[20].value = net_ip2addr(&auth_request->real_remote_ip);
tab[21].value = dec2str(auth_request->real_local_port);
tab[22].value = dec2str(auth_request->real_remote_port);
tab[23].value = strchr(auth_request->user, '@');
if (tab[23].value != NULL) {
tab[23].value = escape_func(t_strcut(tab[23].value+1, '@'),
auth_request);
}
tab[24].value = strrchr(auth_request->user, '@');
if (tab[24].value != NULL)
tab[24].value = escape_func(tab[24].value+1, auth_request);
tab[25].value = auth_request->master_user == NULL ? NULL :
escape_func(auth_request->master_user, auth_request);
tab[26].value = auth_request->session_pid == (pid_t)-1 ? NULL :
dec2str(auth_request->session_pid);
orig_user = auth_request->original_username != NULL ?
auth_request->original_username : auth_request->user;
tab[27].value = escape_func(orig_user, auth_request);
tab[28].value = escape_func(t_strcut(orig_user, '@'), auth_request);
tab[29].value = strchr(orig_user, '@');
if (tab[29].value != NULL)
tab[29].value = escape_func(tab[29].value+1, auth_request);
if (auth_request->master_user != NULL)
auth_user = auth_request->master_user;
else
auth_user = orig_user;
tab[30].value = escape_func(auth_user, auth_request);
tab[31].value = escape_func(t_strcut(auth_user, '@'), auth_request);
tab[32].value = strchr(auth_user, '@');
if (tab[32].value != NULL)
tab[32].value = escape_func(tab[32].value+1, auth_request);
return ret_tab;
}
const struct var_expand_table *
auth_request_get_var_expand_table(const struct auth_request *auth_request,
auth_request_escape_func_t *escape_func)
{
unsigned int count = 0;
return auth_request_get_var_expand_table_full(auth_request, escape_func,
&count);
}
static const char *field_get_default(const char *data)
{
const char *p;
p = strchr(data, ':');
if (p == NULL)
return "";
else {
/* default value given */
return p+1;
}
}
static const char *
auth_request_var_expand_func_passdb(const char *data, void *context)
{
struct auth_request_var_expand_ctx *ctx = context;
const char *field_name = t_strcut(data, ':');
const char *value;
value = auth_fields_find(ctx->auth_request->extra_fields, field_name);
return ctx->escape_func(value != NULL ? value : field_get_default(data),
ctx->auth_request);
}
static const char *
auth_request_var_expand_func_userdb(const char *data, void *context)
{
struct auth_request_var_expand_ctx *ctx = context;
const char *field_name = t_strcut(data, ':');
const char *value;
value = ctx->auth_request->userdb_reply == NULL ? NULL :
auth_fields_find(ctx->auth_request->userdb_reply, field_name);
return ctx->escape_func(value != NULL ? value : field_get_default(data),
ctx->auth_request);
}
const struct var_expand_func_table auth_request_var_funcs_table[] = {
{ "passdb", auth_request_var_expand_func_passdb },
{ "userdb", auth_request_var_expand_func_userdb },
{ NULL, NULL }
};
void auth_request_var_expand(string_t *dest, const char *str,
struct auth_request *auth_request,
auth_request_escape_func_t *escape_func)
{
auth_request_var_expand_with_table(dest, str, auth_request,
auth_request_get_var_expand_table(auth_request, escape_func),
escape_func);
}
void auth_request_var_expand_with_table(string_t *dest, const char *str,
struct auth_request *auth_request,
const struct var_expand_table *table,
auth_request_escape_func_t *escape_func)
{
struct auth_request_var_expand_ctx ctx;
memset(&ctx, 0, sizeof(ctx));
ctx.auth_request = auth_request;
ctx.escape_func = escape_func == NULL ? escape_none : escape_func;
var_expand_with_funcs(dest, str, table,
auth_request_var_funcs_table, &ctx);
}
const char *
t_auth_request_var_expand(const char *str,
struct auth_request *auth_request,
auth_request_escape_func_t *escape_func)
{
string_t *dest = t_str_new(128);
auth_request_var_expand(dest, str, auth_request, escape_func);
return str_c(dest);
}