1#include "xs.h"
  2
  3#include "snac.h"
  4
  5#if defined(__OpenBSD__)
  6
  7void sbox_enter(const char *basedir)
  8{
  9    const char *address = xs_dict_get(srv_config, "address");
 10
 11    if (xs_is_true(xs_dict_get(srv_config, "disable_openbsd_security"))) {
 12        srv_log(xs_dup("OpenBSD security disabled by admin"));
 13        return;
 14    }
 15
 16    int smail;
 17    const char *url = xs_dict_get(srv_config, "smtp_url");
 18
 19    if (xs_is_string(url) && *url)
 20        smail = 0;
 21    else
 22        smail = !xs_is_true(xs_dict_get(srv_config, "disable_email_notifications"));
 23
 24    srv_debug(1, xs_fmt("Calling unveil()"));
 25    unveil(basedir,                "rwc");
 26    unveil("/tmp",                 "rwc");
 27    unveil("/etc/resolv.conf",     "r");
 28    unveil("/etc/hosts",           "r");
 29    unveil("/etc/ssl/openssl.cnf", "r");
 30    unveil("/etc/ssl/cert.pem",    "r");
 31    unveil("/usr/share/zoneinfo",  "r");
 32
 33    if (*address == '/')
 34        unveil(address, "rwc");
 35
 36    if (smail)
 37        unveil("/usr/sbin/sendmail",   "x");
 38
 39    unveil(NULL,                   NULL);
 40
 41    srv_debug(1, xs_fmt("Calling pledge()"));
 42
 43    xs *p = xs_str_new("stdio rpath wpath cpath flock inet proc dns fattr");
 44
 45    if (*address == '/')
 46        p = xs_str_cat(p, " unix");
 47
 48    if (smail)
 49        p = xs_str_cat(p, " exec");
 50
 51    pledge(p, NULL);
 52}
 53
 54#elif defined(__linux__)
 55
 56#if defined(WITH_LINUX_SANDBOX)
 57
 58#include <unistd.h>
 59
 60#define LL_PRINTERR(fmt, ...) srv_debug(0, xs_fmt(fmt, __VA_ARGS__))
 61#include "landloc.h"
 62
 63static
 64LL_BEGIN(sbox_enter_linux_, const char* basedir, const char *address, int smtp_port) {
 65
 66    const unsigned long long
 67        rd = LANDLOCK_ACCESS_FS_READ_DIR,
 68        rf = LANDLOCK_ACCESS_FS_READ_FILE,
 69        w  = LANDLOCK_ACCESS_FS_WRITE_FILE      |
 70             LANDLOCK_ACCESS_FS_TRUNCATE_COMPAT,
 71        c  = LANDLOCK_ACCESS_FS_MAKE_DIR        |
 72             LANDLOCK_ACCESS_FS_MAKE_REG        |
 73             LANDLOCK_ACCESS_FS_TRUNCATE_COMPAT |
 74             LANDLOCK_ACCESS_FS_MAKE_SYM        |
 75             LANDLOCK_ACCESS_FS_REMOVE_DIR      |
 76             LANDLOCK_ACCESS_FS_REMOVE_FILE     |
 77             LANDLOCK_ACCESS_FS_REFER_COMPAT,
 78        s  = LANDLOCK_ACCESS_FS_MAKE_SOCK,
 79        x  = LANDLOCK_ACCESS_FS_EXECUTE;
 80    char *resolved_path = NULL;
 81
 82    LL_PATH(basedir,                rf|rd|w|c);
 83    LL_PATH("/tmp",                 rf|rd|w|c);
 84#ifndef WITHOUT_SHM
 85    LL_PATH("/dev/shm",             rf|w|c   );
 86#endif
 87    LL_PATH("/dev/urandom",         rf       );
 88    LL_PATH("/etc/resolv.conf",     rf       );
 89    LL_PATH("/etc/hosts",           rf       );
 90    LL_PATH("/etc/ssl",             rf|rd    );
 91    if ((resolved_path = realpath("/etc/ssl/cert.pem", NULL))) {
 92        /* some distros like cert.pem to be a symlink */
 93        LL_PATH(resolved_path,      rf       );
 94        free(resolved_path);
 95    }
 96    LL_PATH("/usr/share/zoneinfo",  rf       );
 97
 98    if (mtime("/etc/pki") > 0)
 99        LL_PATH("/etc/pki",         rf       );
100
101    if (*address == '/') {
102        /* the directory holding the socket must be allowed */
103        xs *l = xs_split(address, "/");
104        l = xs_list_del(l, -1);
105        xs *sdir = xs_join(l, "/");
106
107        LL_PATH(sdir, s);
108    }
109
110    if (*address != '/') {
111        unsigned short listen_port = xs_number_get(xs_dict_get(srv_config, "port"));
112        LL_PORT(listen_port, LANDLOCK_ACCESS_NET_BIND_TCP_COMPAT);
113    }
114
115    LL_PORT(80,  LANDLOCK_ACCESS_NET_CONNECT_TCP_COMPAT);
116    LL_PORT(443, LANDLOCK_ACCESS_NET_CONNECT_TCP_COMPAT);
117    if (smtp_port > 0)
118        LL_PORT((unsigned short)smtp_port, LANDLOCK_ACCESS_NET_CONNECT_TCP_COMPAT);
119
120} LL_END
121
122void sbox_enter(const char *basedir)
123{
124    const char *errstr;
125    const char *address = xs_dict_get(srv_config, "address");
126    const char *smtp_url = xs_dict_get(srv_config, "smtp_url");
127    int smtp_port = -1;
128
129    if (xs_is_true(xs_dict_get(srv_config, "disable_sandbox"))) {
130        srv_debug(1, xs_dup("Linux sandbox disabled by admin"));
131        return;
132    }
133
134    if (xs_is_string(smtp_url) && *smtp_url != '\0') {
135        smtp_port = parse_port(smtp_url, &errstr);
136        if (errstr)
137            srv_debug(0, xs_fmt("Couldn't determine port from '%s': %s", smtp_url, errstr));
138    }
139
140    if (sbox_enter_linux_(basedir, address, smtp_port) == 0)
141        srv_debug(1, xs_dup("Linux sandbox enabled"));
142    else
143        srv_debug(0, xs_dup("Linux sandbox failed"));
144}
145
146#else /* defined(WITH_LINUX_SANDBOX) */
147
148void sbox_enter(const char *basedir)
149{
150    (void)basedir;
151
152    srv_debug(1, xs_fmt("Linux sandbox not compiled in"));
153}
154
155#endif
156
157#else
158
159/* other OSs: dummy sbox_enter() */
160
161void sbox_enter(const char *basedir)
162{
163    (void)basedir;
164}
165
166
167#endif /* __OpenBSD__ */