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Diffstat (limited to 'platform.c')
| -rw-r--r-- | platform.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/platform.c b/platform.c new file mode 100644 index 0000000..4fe8744 --- /dev/null +++ b/platform.c @@ -0,0 +1,250 @@ +/* + * Copyright (c) 2006 Darren Tucker. All rights reserved. + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include "includes.h" + +#include <stdarg.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> + +#include "log.h" +#include "misc.h" +#include "servconf.h" +#include "sshkey.h" +#include "hostfile.h" +#include "auth.h" +#include "auth-pam.h" +#include "platform.h" + +#include "openbsd-compat/openbsd-compat.h" + +extern int use_privsep; +extern ServerOptions options; + +void +platform_pre_listen(void) +{ +#ifdef LINUX_OOM_ADJUST + /* Adjust out-of-memory killer so listening process is not killed */ + oom_adjust_setup(); +#endif +} + +void +platform_pre_fork(void) +{ +#ifdef USE_SOLARIS_PROCESS_CONTRACTS + solaris_contract_pre_fork(); +#endif +} + +void +platform_pre_restart(void) +{ +#ifdef LINUX_OOM_ADJUST + oom_adjust_restore(); +#endif +} + +void +platform_post_fork_parent(pid_t child_pid) +{ +#ifdef USE_SOLARIS_PROCESS_CONTRACTS + solaris_contract_post_fork_parent(child_pid); +#endif +} + +void +platform_post_fork_child(void) +{ +#ifdef USE_SOLARIS_PROCESS_CONTRACTS + solaris_contract_post_fork_child(); +#endif +#ifdef LINUX_OOM_ADJUST + oom_adjust_restore(); +#endif +} + +/* return 1 if we are running with privilege to swap UIDs, 0 otherwise */ +int +platform_privileged_uidswap(void) +{ +#ifdef HAVE_CYGWIN + /* uid 0 is not special on Cygwin so always try */ + return 1; +#else + return (getuid() == 0 || geteuid() == 0); +#endif +} + +/* + * This gets called before switching UIDs, and is called even when sshd is + * not running as root. + */ +void +platform_setusercontext(struct passwd *pw) +{ +#ifdef WITH_SELINUX + /* Cache selinux status for later use */ + (void)ssh_selinux_enabled(); +#endif + +#ifdef USE_SOLARIS_PROJECTS + /* + * If solaris projects were detected, set the default now, unless + * we are using PAM in which case it is the responsibility of the + * PAM stack. + */ + if (!options.use_pam && (getuid() == 0 || geteuid() == 0)) + solaris_set_default_project(pw); +#endif + +#if defined(HAVE_LOGIN_CAP) && defined (__bsdi__) + if (getuid() == 0 || geteuid() == 0) + setpgid(0, 0); +# endif + +#if defined(HAVE_LOGIN_CAP) && defined(USE_PAM) + /* + * If we have both LOGIN_CAP and PAM, we want to establish creds + * before calling setusercontext (in session.c:do_setusercontext). + */ + if (getuid() == 0 || geteuid() == 0) { + if (options.use_pam) { + do_pam_setcred(use_privsep); + } + } +# endif /* USE_PAM */ + +#if !defined(HAVE_LOGIN_CAP) && defined(HAVE_GETLUID) && defined(HAVE_SETLUID) + if (getuid() == 0 || geteuid() == 0) { + /* Sets login uid for accounting */ + if (getluid() == -1 && setluid(pw->pw_uid) == -1) + error("setluid: %s", strerror(errno)); + } +#endif +} + +/* + * This gets called after we've established the user's groups, and is only + * called if sshd is running as root. + */ +void +platform_setusercontext_post_groups(struct passwd *pw) +{ +#if !defined(HAVE_LOGIN_CAP) && defined(USE_PAM) + /* + * PAM credentials may take the form of supplementary groups. + * These will have been wiped by the above initgroups() call. + * Reestablish them here. + */ + if (options.use_pam) { + do_pam_setcred(use_privsep); + } +#endif /* USE_PAM */ + +#if !defined(HAVE_LOGIN_CAP) && (defined(WITH_IRIX_PROJECT) || \ + defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)) + irix_setusercontext(pw); +#endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ + +#ifdef _AIX + aix_usrinfo(pw); +#endif /* _AIX */ + +#ifdef HAVE_SETPCRED + /* + * If we have a chroot directory, we set all creds except real + * uid which we will need for chroot. If we don't have a + * chroot directory, we don't override anything. + */ + { + char **creds = NULL, *chroot_creds[] = + { "REAL_USER=root", NULL }; + + if (options.chroot_directory != NULL && + strcasecmp(options.chroot_directory, "none") != 0) + creds = chroot_creds; + + if (setpcred(pw->pw_name, creds) == -1) + fatal("Failed to set process credentials"); + } +#endif /* HAVE_SETPCRED */ +#ifdef WITH_SELINUX + ssh_selinux_setup_exec_context(pw->pw_name); +#endif +} + +char * +platform_krb5_get_principal_name(const char *pw_name) +{ +#ifdef USE_AIX_KRB_NAME + return aix_krb5_get_principal_name(pw_name); +#else + return NULL; +#endif +} + +/* returns 1 if account is locked */ +int +platform_locked_account(struct passwd *pw) +{ + int locked = 0; + char *passwd = pw->pw_passwd; +#ifdef USE_SHADOW + struct spwd *spw = NULL; +#ifdef USE_LIBIAF + char *iaf_passwd = NULL; +#endif + + spw = getspnam(pw->pw_name); +#ifdef HAS_SHADOW_EXPIRE + if (spw != NULL && auth_shadow_acctexpired(spw)) + return 1; +#endif /* HAS_SHADOW_EXPIRE */ + + if (spw != NULL) +#ifdef USE_LIBIAF + iaf_passwd = passwd = get_iaf_password(pw); +#else + passwd = spw->sp_pwdp; +#endif /* USE_LIBIAF */ +#endif + + /* check for locked account */ + if (passwd && *passwd) { +#ifdef LOCKED_PASSWD_STRING + if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0) + locked = 1; +#endif +#ifdef LOCKED_PASSWD_PREFIX + if (strncmp(passwd, LOCKED_PASSWD_PREFIX, + strlen(LOCKED_PASSWD_PREFIX)) == 0) + locked = 1; +#endif +#ifdef LOCKED_PASSWD_SUBSTR + if (strstr(passwd, LOCKED_PASSWD_SUBSTR)) + locked = 1; +#endif + } +#ifdef USE_LIBIAF + if (iaf_passwd != NULL) + freezero(iaf_passwd, strlen(iaf_passwd)); +#endif /* USE_LIBIAF */ + + return locked; +} |