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/* Copyright (c) 2014-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "array.h"
#include "ioloop.h"
#include "istream.h"
#include "strescape.h"
#include "wildcard-match.h"
#include "acl-api-private.h"
#include "acl-global-file.h"
#include <sys/stat.h>
struct acl_global_rights {
const char *vpattern;
ARRAY_TYPE(acl_rights) rights;
};
struct acl_global_parse_rights {
const char *vpattern;
struct acl_rights rights;
};
struct acl_global_file {
char *path;
struct stat prev_st;
time_t last_refresh_time;
pool_t rights_pool;
ARRAY(struct acl_global_rights) rights;
unsigned int refresh_interval_secs;
bool debug;
};
struct acl_global_file *
acl_global_file_init(const char *path, unsigned int refresh_interval_secs,
bool debug)
{
struct acl_global_file *file;
file = i_new(struct acl_global_file, 1);
file->path = i_strdup(path);
file->refresh_interval_secs = refresh_interval_secs;
file->debug = debug;
i_array_init(&file->rights, 32);
file->rights_pool = pool_alloconly_create("acl global file rights", 1024);
return file;
}
void acl_global_file_deinit(struct acl_global_file **_file)
{
struct acl_global_file *file = *_file;
*_file = NULL;
array_free(&file->rights);
pool_unref(&file->rights_pool);
i_free(file->path);
i_free(file);
}
static int acl_global_parse_rights_cmp(const struct acl_global_parse_rights *r1,
const struct acl_global_parse_rights *r2)
{
return strcmp(r1->vpattern, r2->vpattern);
}
struct acl_global_file_parse_ctx {
struct acl_global_file *file;
ARRAY(struct acl_global_parse_rights) parse_rights;
};
static int
acl_global_file_parse_line(struct acl_global_file_parse_ctx *ctx,
const char *line, const char **error_r)
{
struct acl_global_parse_rights *pright;
const char *p, *vpattern;
if (*line == '"') {
line++;
if (str_unescape_next(&line, &vpattern) < 0) {
*error_r = "Missing '\"'";
return -1;
}
if (line[0] != ' ') {
*error_r = "Expecting space after '\"'";
return -1;
}
line++;
} else {
p = strchr(line, ' ');
if (p == NULL) {
*error_r = "Missing ACL rights";
return -1;
}
if (p == line) {
*error_r = "Empty ACL pattern";
return -1;
}
vpattern = t_strdup_until(line, p);
line = p + 1;
}
pright = array_append_space(&ctx->parse_rights);
pright->vpattern = p_strdup(ctx->file->rights_pool, vpattern);
if (acl_rights_parse_line(line, ctx->file->rights_pool,
&pright->rights, error_r) < 0)
return -1;
pright->rights.global = TRUE;
return 0;
}
static int acl_global_file_read(struct acl_global_file *file)
{
struct acl_global_file_parse_ctx ctx;
struct acl_global_parse_rights *pright;
struct acl_global_rights *right;
struct istream *input;
const char *line, *error, *prev_vpattern;
unsigned int linenum = 0;
int ret = 0;
array_clear(&file->rights);
p_clear(file->rights_pool);
i_zero(&ctx);
ctx.file = file;
i_array_init(&ctx.parse_rights, 32);
input = i_stream_create_file(file->path, SIZE_MAX);
i_stream_set_return_partial_line(input, TRUE);
while ((line = i_stream_read_next_line(input)) != NULL) {
linenum++;
if (line[0] == '\0' || line[0] == '#')
continue;
T_BEGIN {
ret = acl_global_file_parse_line(&ctx, line, &error);
if (ret < 0) {
i_error("Global ACL file %s line %u: %s",
file->path, linenum, error);
}
} T_END;
if (ret < 0)
break;
}
if (ret == 0 && input->stream_errno != 0) {
i_error("Couldn't read global ACL file %s: %s",
file->path, i_stream_get_error(input));
ret = -1;
}
if (ret == 0) {
const struct stat *st;
if (i_stream_stat(input, TRUE, &st) < 0) {
i_error("Couldn't stat global ACL file %s: %s",
file->path, i_stream_get_error(input));
ret = -1;
} else {
file->prev_st = *st;
}
}
i_stream_destroy(&input);
/* sort all parsed rights */
array_sort(&ctx.parse_rights, acl_global_parse_rights_cmp);
/* combine identical patterns into same structs */
prev_vpattern = ""; right = NULL;
array_foreach_modifiable(&ctx.parse_rights, pright) {
if (right == NULL ||
strcmp(prev_vpattern, pright->vpattern) != 0) {
right = array_append_space(&file->rights);
right->vpattern = pright->vpattern;
p_array_init(&right->rights, file->rights_pool, 4);
}
array_push_back(&right->rights, &pright->rights);
}
array_free(&ctx.parse_rights);
return ret;
}
int acl_global_file_refresh(struct acl_global_file *file)
{
struct stat st;
if (file->last_refresh_time + (time_t)file->refresh_interval_secs > ioloop_time)
return 0;
if (file->last_refresh_time != 0) {
if (stat(file->path, &st) < 0) {
i_error("stat(%s) failed: %m", file->path);
return -1;
}
if (st.st_ino == file->prev_st.st_ino &&
st.st_size == file->prev_st.st_size &&
CMP_ST_MTIME(&st, &file->prev_st)) {
/* no change to the file */
file->last_refresh_time = ioloop_time;
return 0;
}
}
if (acl_global_file_read(file) < 0)
return -1;
file->last_refresh_time = ioloop_time;
return 0;
}
void acl_global_file_last_stat(struct acl_global_file *file, struct stat *st_r)
{
*st_r = file->prev_st;
}
void acl_global_file_get(struct acl_global_file *file, const char *vname,
pool_t pool, ARRAY_TYPE(acl_rights) *rights_r)
{
struct acl_global_rights *global_rights;
const struct acl_rights *rights;
struct acl_rights *new_rights;
array_foreach_modifiable(&file->rights, global_rights) {
if (!wildcard_match(vname, global_rights->vpattern))
continue;
if (file->debug) {
i_debug("Mailbox '%s' matches global ACL pattern '%s'",
vname, global_rights->vpattern);
}
array_foreach(&global_rights->rights, rights) {
new_rights = array_append_space(rights_r);
acl_rights_dup(rights, pool, new_rights);
}
}
}
bool acl_global_file_have_any(struct acl_global_file *file, const char *vname)
{
struct acl_global_rights *rights;
i_assert(file->last_refresh_time != 0);
array_foreach_modifiable(&file->rights, rights) {
if (wildcard_match(vname, rights->vpattern))
return TRUE;
}
return FALSE;
}
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