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/*
* Copyright (C) 2014-2021 Firejail Authors
*
* This file is part of firejail project
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "fbuilder.h"
static FileDB *db_skip = NULL;
static FileDB *db_out = NULL;
void process_home(const char *fname, char *home, int home_len) {
assert(fname);
assert(home);
assert(home_len);
// process trace file
FILE *fp = fopen(fname, "r");
if (!fp) {
fprintf(stderr, "Error: cannot open %s\n", fname);
exit(1);
}
char buf[MAX_BUF];
while (fgets(buf, MAX_BUF, fp)) {
// remove \n
char *ptr = strchr(buf, '\n');
if (ptr)
*ptr = '\0';
// parse line: 4:galculator:access /etc/fonts/conf.d:0
// number followed by :
ptr = buf;
if (!isdigit(*ptr))
continue;
while (isdigit(*ptr))
ptr++;
if (*ptr != ':')
continue;
ptr++;
// next :
ptr = strchr(ptr, ':');
if (!ptr)
continue;
ptr++;
if (strncmp(ptr, "access /home", 12) == 0)
ptr += 7;
else if (strncmp(ptr, "fopen /home", 11) == 0)
ptr += 6;
else if (strncmp(ptr, "fopen64 /home", 13) == 0)
ptr += 8;
else if (strncmp(ptr, "open64 /home", 12) == 0)
ptr += 7;
else if (strncmp(ptr, "open /home", 10) == 0)
ptr += 5;
else
continue;
// end of filename
char *ptr2 = strchr(ptr, ':');
if (!ptr2)
continue;
*ptr2 = '\0';
// check home directory
if (strncmp(ptr, home, home_len) != 0)
continue;
if (strcmp(ptr, home) == 0)
continue;
ptr += home_len + 1;
// skip files handled automatically by firejail
if (strcmp(ptr, ".Xauthority") == 0 ||
strcmp(ptr, ".Xdefaults-debian") == 0 ||
strncmp(ptr, ".config/pulse/", 14) == 0 ||
strncmp(ptr, ".pulse/", 7) == 0 ||
strncmp(ptr, ".bash_hist", 10) == 0 ||
strcmp(ptr, ".bashrc") == 0)
continue;
// try to find the relevant directory for this file
char *dir = extract_dir(ptr);
char *toadd = (dir)? dir: ptr;
// skip some dot directories
if (strcmp(toadd, ".config") == 0 ||
strcmp(toadd, ".local") == 0 ||
strcmp(toadd, ".local/share") == 0 ||
strcmp(toadd, ".cache") == 0) {
if (dir)
free(dir);
continue;
}
// clean .cache entries
if (strncmp(toadd, ".cache/", 7) == 0) {
char *ptr2 = toadd + 7;
ptr2 = strchr(ptr2, '/');
if (ptr2)
*ptr2 = '\0';
}
// skip files and directories in whitelist-common.inc
if (strlen(toadd) == 0 || filedb_find(db_skip, toadd)) {
if (dir)
free(dir);
continue;
}
// add the file to out list
db_out = filedb_add(db_out, toadd);
if (dir)
free(dir);
}
fclose(fp);
}
// process fname, fname.1, fname.2, fname.3, fname.4, fname.5
void build_home(const char *fname, FILE *fp) {
assert(fname);
// load whitelist common
db_skip = filedb_load_whitelist(db_skip, "whitelist-common.inc", "whitelist ${HOME}/");
// find user home directory
struct passwd *pw = getpwuid(getuid());
if (!pw)
errExit("getpwuid");
char *home = pw->pw_dir;
if (!home)
errExit("getpwuid");
int home_len = strlen(home);
// run fname
process_home(fname, home, home_len);
// run all the rest
struct stat s;
int i;
for (i = 1; i <= 5; i++) {
char *newname;
if (asprintf(&newname, "%s.%d", fname, i) == -1)
errExit("asprintf");
if (stat(newname, &s) == 0)
process_home(newname, home, home_len);
free(newname);
}
// print the out list if any
if (db_out) {
filedb_print(db_out, "whitelist ${HOME}/", fp);
fprintf(fp, "include whitelist-common.inc\n");
}
else
fprintf(fp, "private\n");
}
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