X-Git-Url: https://git.armaanb.net/?p=opendoas.git;a=blobdiff_plain;f=doas.c;h=6223aff219168fa87f9a38909f9f072535114c21;hp=3474a7c92b0ad5d028c47aa49e93a2c5141d7fcb;hb=fe5ec5717fe414e9f1e12bbdf0794c18af3238fb;hpb=3d4da2df4672135c3fe89bb7083f07a3a1849452 diff --git a/doas.c b/doas.c index 3474a7c..6223aff 100644 --- a/doas.c +++ b/doas.c @@ -17,8 +17,13 @@ #include #include +#include #include +#if __OpenBSD__ +# include +# include +#endif #include #include #include @@ -28,46 +33,22 @@ #include #include #include -#if HAVE_SHADOW_H -#include -#endif #include "includes.h" #include "doas.h" -static void __dead -version(void) -{ - fprintf(stderr, "doas: version %s built %s\n", VERSION, __DATE__); - exit(1); -} - static void __dead usage(void) { - fprintf(stderr, "usage: doas [-nsv] " -#ifdef HAVE_BSD_AUTH_H + fprintf(stderr, "usage: doas [-Lns] " +#ifdef __OpenBSD__ "[-a style] " #endif "[-C config] [-u user] command [args]\n"); exit(1); } -size_t -arraylen(const char **arr) -{ - size_t cnt = 0; - - if (arr) { - while (*arr) { - cnt++; - arr++; - } - } - return cnt; -} - static int parseuid(const char *s, uid_t *uid) { @@ -153,7 +134,7 @@ match(uid_t uid, gid_t *groups, int ngroups, uid_t target, const char *cmd, } static int -permit(uid_t uid, gid_t *groups, int ngroups, struct rule **lastr, +permit(uid_t uid, gid_t *groups, int ngroups, const struct rule **lastr, uid_t target, const char *cmd, const char **cmdargs) { int i; @@ -200,7 +181,7 @@ static void __dead checkconfig(const char *confpath, int argc, char **argv, uid_t uid, gid_t *groups, int ngroups, uid_t target) { - struct rule *rule; + const struct rule *rule; if (setresuid(uid, uid, uid) != 0) err(1, "setresuid"); @@ -219,12 +200,20 @@ checkconfig(const char *confpath, int argc, char **argv, } } -#ifdef HAVE_BSD_AUTH_H +#ifdef USE_BSD_AUTH static void -authuser(char *myname, char *login_style) +authuser(char *myname, char *login_style, int persist) { char *challenge = NULL, *response, rbuf[1024], cbuf[128]; auth_session_t *as; + int fd = -1; + + if (persist) + fd = open("/dev/tty", O_RDWR); + if (fd != -1) { + if (ioctl(fd, TIOCCHKVERAUTH) == 0) + goto good; + } if (!(as = auth_userchallenge(myname, login_style, "auth-doas", &challenge))) @@ -245,58 +234,20 @@ authuser(char *myname, char *login_style) errx(1, "a tty is required"); } if (!auth_userresponse(as, response, 0)) { + explicit_bzero(rbuf, sizeof(rbuf)); syslog(LOG_AUTHPRIV | LOG_NOTICE, "failed auth for %s", myname); - errc(1, EPERM, NULL); - } - explicit_bzero(rbuf, sizeof(rbuf)); -} -#elif HAVE_SHADOW_H -static void -authuser(const char *myname, const char *login_style) -{ - const char *hash; - char *encrypted; - struct passwd *pw; - - (void)login_style; - (void)persist; - - if (!(pw = getpwnam(myname))) - err(1, "getpwnam"); - - hash = pw->pw_passwd; - if (hash[0] == 'x' && hash[1] == '\0') { - struct spwd *sp; - if (!(sp = getspnam(myname))) - errx(1, "Authorization failed"); - hash = sp->sp_pwdp; - } else if (hash[0] != '*') { - errx(1, "Authorization failed"); - } - - char *challenge, *response, rbuf[1024], cbuf[128], host[HOST_NAME_MAX + 1]; - if (gethostname(host, sizeof(host))) - snprintf(host, sizeof(host), "?"); - snprintf(cbuf, sizeof(cbuf), - "\rdoas (%.32s@%.32s) password: ", myname, host); - challenge = cbuf; - - response = readpassphrase(challenge, rbuf, sizeof(rbuf), RPP_REQUIRE_TTY); - if (response == NULL && errno == ENOTTY) { - syslog(LOG_AUTHPRIV | LOG_NOTICE, - "tty required for %s", myname); - errx(1, "a tty is required"); - } - if (!(encrypted = crypt(response, hash))) - errx(1, "crypt"); - if (strcmp(encrypted, hash) != 0) { - syslog(LOG_AUTHPRIV | LOG_NOTICE, "failed auth for %s", myname); errx(1, "Authorization failed"); } explicit_bzero(rbuf, sizeof(rbuf)); +good: + if (fd != -1) { + int secs = 5 * 60; + ioctl(fd, TIOCSETVERAUTH, &secs); + close(fd); + } } -#endif /* HAVE_BSD_AUTH_H */ +#endif int main(int argc, char **argv) @@ -310,7 +261,7 @@ main(int argc, char **argv) char cmdline[LINE_MAX]; char myname[_PW_NAME_LEN + 1]; struct passwd *pw; - struct rule *rule; + const struct rule *rule; uid_t uid; uid_t target = 0; gid_t groups[NGROUPS_MAX + 1]; @@ -318,30 +269,28 @@ main(int argc, char **argv) int i, ch; int sflag = 0; int nflag = 0; - int vflag = 0; char cwdpath[PATH_MAX]; const char *cwd; char **envp; +#ifdef USE_BSD_AUTH char *login_style = NULL; +#endif setprogname("doas"); - if (pledge("stdio rpath getpw tty recvfd proc exec id", NULL) == -1) - err(1, "pledge"); - closefrom(STDERR_FILENO + 1); uid = getuid(); -#ifdef HAVE_BSD_AUTH_H -# define OPTSTRING "a:C:nsu:v" +#ifdef USE_BSD_AUTH +# define OPTSTRING "a:C:Lnsu:" #else -# define OPTSTRING "+C:nsu:v" +# define OPTSTRING "+C:Lnsu:" #endif while ((ch = getopt(argc, argv, OPTSTRING)) != -1) { switch (ch) { -#ifdef HAVE_BSD_AUTH_H +#ifdef USE_BSD_AUTH case 'a': login_style = optarg; break; @@ -349,6 +298,17 @@ main(int argc, char **argv) case 'C': confpath = optarg; break; + case 'L': +#if defined(USE_BSD_AUTH) + i = open("/dev/tty", O_RDWR); + if (i != -1) + ioctl(i, TIOCCLRVERAUTH); + exit(i == -1); +#elif defined(USE_TIMESTAMP) + exit(timestamp_clear() == -1); +#else + exit(0); +#endif case 'u': if (parseuid(optarg, &target) != 0) errx(1, "unknown user"); @@ -359,9 +319,6 @@ main(int argc, char **argv) case 's': sflag = 1; break; - case 'v': - vflag = 1; - break; default: usage(); break; @@ -370,9 +327,6 @@ main(int argc, char **argv) argv += optind; argc -= optind; - if (vflag) - version(); - if (confpath) { if (sflag) usage(); @@ -407,6 +361,9 @@ main(int argc, char **argv) exit(1); /* fail safe */ } + if (geteuid()) + errx(1, "not installed setuid"); + parseconfig("/etc/doas.conf", 1); /* cmdline is used only for logging, no need to abort on truncate */ @@ -426,57 +383,76 @@ main(int argc, char **argv) errc(1, EPERM, NULL); } -#if defined(HAVE_BSD_AUTH_H) || defined(HAVE_SHADOW_H) +#if defined(__OpenBSD__) if (!(rule->options & NOPASS)) { if (nflag) errx(1, "Authorization required"); - authuser(myname, login_style); + authuser(myname, login_style, rule->options & PERSIST); } -#elif HAVE_PAM_APPL_H + + if (pledge("stdio rpath getpw exec id", NULL) == -1) + err(1, "pledge"); + pw = getpwuid(target); if (!pw) errx(1, "no passwd entry for target"); - if (!pamauth(pw->pw_name, myname, !nflag, rule->options & NOPASS)) { - syslog(LOG_AUTHPRIV | LOG_NOTICE, "failed auth for %s", myname); - errx(1, "Authorization failed"); +#elif defined(USE_SHADOW) + if (!(rule->options & NOPASS)) { + if (nflag) + errx(1, "Authorization required"); + + shadowauth(myname, rule->options & PERSIST); } -#else -#error "No authentication method" -#endif /* HAVE_BSD_AUTH_H */ - if (pledge("stdio rpath getpw exec id", NULL) == -1) - err(1, "pledge"); + pw = getpwuid(target); + if (!pw) + errx(1, "no passwd entry for target"); +#elif defined(USE_PAM) pw = getpwuid(target); if (!pw) errx(1, "no passwd entry for target"); -#ifdef HAVE_BSD_AUTH_H + pamauth(pw->pw_name, myname, !nflag, rule->options & NOPASS, + rule->options & PERSIST); + +#else + (void) nflag; + if (!(rule->options & NOPASS)) { + errx(1, "Authorization required"); + } +#endif + +#ifdef HAVE_SETUSERCONTEXT if (setusercontext(NULL, pw, target, LOGIN_SETGROUP | LOGIN_SETPRIORITY | LOGIN_SETRESOURCES | LOGIN_SETUMASK | LOGIN_SETUSER) != 0) errx(1, "failed to set user context for target"); #else if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) != 0) - errx(1, "setresgid"); + err(1, "setresgid"); if (initgroups(pw->pw_name, pw->pw_gid) != 0) - errx(1, "initgroups"); + err(1, "initgroups"); if (setresuid(target, target, target) != 0) - errx(1, "setresuid"); + err(1, "setresuid"); #endif +#ifdef __OpenBSD__ if (pledge("stdio rpath exec", NULL) == -1) err(1, "pledge"); +#endif if (getcwd(cwdpath, sizeof(cwdpath)) == NULL) cwd = "(failed)"; else cwd = cwdpath; +#ifdef __OpenBSD__ if (pledge("stdio exec", NULL) == -1) err(1, "pledge"); +#endif syslog(LOG_AUTHPRIV | LOG_INFO, "%s ran command %s as %s from %s", myname, cmdline, pw->pw_name, cwd);