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openSUSE:12.2:Update
ecryptfs-utils
ecryptfs-utils.security.patch
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File ecryptfs-utils.security.patch of Package ecryptfs-utils
Index: ecryptfs-utils-96/src/pam_ecryptfs/pam_ecryptfs.c =================================================================== --- ecryptfs-utils-96.orig/src/pam_ecryptfs/pam_ecryptfs.c +++ ecryptfs-utils-96/src/pam_ecryptfs/pam_ecryptfs.c @@ -32,13 +32,17 @@ #include <unistd.h> #include <errno.h> #include <syslog.h> +#include <limits.h> #include <pwd.h> #include <sys/types.h> #include <sys/wait.h> #include <sys/types.h> #include <sys/stat.h> +#include <sys/fsuid.h> +#include <grp.h> #include <fcntl.h> #include <security/pam_modules.h> +#include <security/pam_ext.h> #include "../include/ecryptfs.h" #define PRIVATE_DIR "Private" @@ -119,9 +123,11 @@ static int wrap_passphrase_if_necessary( PAM_EXTERN int pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char **argv) { - uid_t uid = 0; + uid_t uid = 0, oeuid = 0; + long ngroups_max = sysconf(_SC_NGROUPS_MAX); + gid_t gid = 0, oegid = 0, groups[ngroups_max+1]; + int ngids = 0; char *homedir = NULL; - uid_t saved_uid = 0; const char *username; char *passphrase = NULL; char salt[ECRYPTFS_SALT_SIZE]; @@ -139,12 +145,25 @@ PAM_EXTERN int pam_sm_authenticate(pam_h pwd = getpwnam(username); if (pwd) { uid = pwd->pw_uid; + gid = pwd->pw_gid; homedir = pwd->pw_dir; } } else { syslog(LOG_ERR, "pam_ecryptfs: Error getting passwd info for user [%s]; rc = [%ld]\n", username, rc); goto out; } + + if ((oeuid = geteuid()) < 0 || (oegid = getegid()) < 0 || + (ngids = getgroups(sizeof(groups)/sizeof(gid_t), groups)) < 0) { + syslog(LOG_ERR, "pam_ecryptfs: geteuid error"); + goto outnouid; + } + + if (setegid(gid) < 0 || setgroups(1, &gid) < 0 || seteuid(uid) < 0) { + syslog(LOG_ERR, "pam_ecryptfs: seteuid error"); + goto out; + } + if (!file_exists_dotecryptfs(homedir, "auto-mount")) goto out; private_mnt = ecryptfs_fetch_private_mnt(homedir); @@ -158,13 +177,10 @@ PAM_EXTERN int pam_sm_authenticate(pam_h load ecryptfs module if not loaded already */ if (ecryptfs_get_version(&version) != 0) syslog(LOG_WARNING, "pam_ecryptfs: Can't check if kernel supports ecryptfs\n"); - saved_uid = geteuid(); - seteuid(uid); if(file_exists_dotecryptfs(homedir, "wrapping-independent") == 1) rc = pam_prompt(pamh, PAM_PROMPT_ECHO_OFF, &passphrase, "Encryption passphrase: "); else rc = pam_get_item(pamh, PAM_AUTHTOK, (const void **)&passphrase); - seteuid(saved_uid); if (rc != PAM_SUCCESS) { syslog(LOG_ERR, "pam_ecryptfs: Error retrieving passphrase; rc = [%ld]\n", rc); @@ -182,7 +198,12 @@ PAM_EXTERN int pam_sm_authenticate(pam_h } else from_hex(salt, salt_hex, ECRYPTFS_SALT_SIZE); if ((child_pid = fork()) == 0) { - setuid(uid); + /* temp regain uid 0 to drop privs */ + seteuid(oeuid); + /* setgroups() already called */ + if (setgid(gid) < 0 || setuid(uid) < 0) + goto out_child; + if (passphrase == NULL) { syslog(LOG_ERR, "pam_ecryptfs: NULL passphrase; aborting\n"); rc = -EINVAL; @@ -240,6 +261,12 @@ out_child: if (tmp_pid == -1) syslog(LOG_WARNING, "pam_ecryptfs: waitpid() returned with error condition\n"); out: + + seteuid(oeuid); + setegid(oegid); + setgroups(ngids, groups); + +outnouid: if (private_mnt != NULL) free(private_mnt); return PAM_SUCCESS; @@ -338,8 +365,12 @@ static int private_dir(pam_handle_t *pam syslog(LOG_DEBUG, "pam_ecryptfs: Skipping automatic eCryptfs mount"); return 0; } + clearenv(); + if (setgroups(1, &pwd->pw_gid) < 0 || setgid(pwd->pw_gid) < 0) + return -1; /* run mount.ecryptfs_private as the user */ - setresuid(pwd->pw_uid, pwd->pw_uid, pwd->pw_uid); + if (setresuid(pwd->pw_uid, pwd->pw_uid, pwd->pw_uid) < 0) + return -1; execl("/sbin/mount.ecryptfs_private", "mount.ecryptfs_private", NULL); } else { @@ -348,8 +379,12 @@ static int private_dir(pam_handle_t *pam syslog(LOG_DEBUG, "pam_ecryptfs: Skipping automatic eCryptfs unmount"); return 0; } + clearenv(); + if (setgroups(1, &pwd->pw_gid) < 0 || setgid(pwd->pw_gid) < 0) + return -1; /* run umount.ecryptfs_private as the user */ - setresuid(pwd->pw_uid, pwd->pw_uid, pwd->pw_uid); + if (setresuid(pwd->pw_uid, pwd->pw_uid, pwd->pw_uid) < 0) + return -1; execl("/sbin/umount.ecryptfs_private", "umount.ecryptfs_private", NULL); } @@ -391,9 +426,11 @@ pam_sm_close_session(pam_handle_t *pamh, PAM_EXTERN int pam_sm_chauthtok(pam_handle_t * pamh, int flags, int argc, const char **argv) { - uid_t uid = 0; + uid_t uid = 0, oeuid = 0; + long ngroups_max = sysconf(_SC_NGROUPS_MAX); + gid_t gid = 0, oegid = 0, groups[ngroups_max+1]; + int ngids = 0; char *homedir = NULL; - uid_t saved_uid = 0; const char *username; char *old_passphrase = NULL; char *new_passphrase = NULL; @@ -411,6 +448,7 @@ PAM_EXTERN int pam_sm_chauthtok(pam_hand pwd = getpwnam(username); if (pwd) { uid = pwd->pw_uid; + gid = pwd->pw_gid; homedir = pwd->pw_dir; name = pwd->pw_name; } @@ -418,13 +456,22 @@ PAM_EXTERN int pam_sm_chauthtok(pam_hand syslog(LOG_ERR, "pam_ecryptfs: Error getting passwd info for user [%s]; rc = [%ld]\n", username, rc); goto out; } - saved_uid = geteuid(); - seteuid(uid); + + if ((oeuid = geteuid()) < 0 || (oegid = getegid()) < 0 || + (ngids = getgroups(sizeof(groups)/sizeof(gid_t), groups)) < 0) { + syslog(LOG_ERR, "pam_ecryptfs: geteuid error"); + goto outnouid; + } + + if (setegid(gid) < 0 || setgroups(1, &gid) < 0 || seteuid(uid) < 0) { + syslog(LOG_ERR, "pam_ecryptfs: seteuid error"); + goto out; + } + if ((rc = pam_get_item(pamh, PAM_OLDAUTHTOK, (const void **)&old_passphrase)) != PAM_SUCCESS) { syslog(LOG_ERR, "pam_ecryptfs: Error retrieving old passphrase; rc = [%d]\n", rc); - seteuid(saved_uid); goto out; } /* On the first pass, do nothing except check that we have a password */ @@ -434,14 +481,12 @@ PAM_EXTERN int pam_sm_chauthtok(pam_hand syslog(LOG_WARNING, "pam_ecryptfs: PAM passphrase change module retrieved a NULL passphrase; nothing to do\n"); rc = PAM_AUTHTOK_RECOVER_ERR; } - seteuid(saved_uid); goto out; } if ((rc = pam_get_item(pamh, PAM_AUTHTOK, (const void **)&new_passphrase)) != PAM_SUCCESS) { syslog(LOG_ERR, "pam_ecryptfs: Error retrieving new passphrase; rc = [%d]\n", rc); - seteuid(saved_uid); goto out; } if ((rc = asprintf(&wrapped_pw_filename, "%s/.ecryptfs/%s", homedir, @@ -462,7 +507,6 @@ PAM_EXTERN int pam_sm_chauthtok(pam_hand goto out; } - seteuid(saved_uid); if (!old_passphrase || !new_passphrase || *new_passphrase == '\0') { syslog(LOG_WARNING, "pam_ecryptfs: PAM passphrase change module retrieved at least one NULL passphrase; nothing to do\n"); rc = PAM_AUTHTOK_RECOVER_ERR; @@ -472,7 +516,12 @@ PAM_EXTERN int pam_sm_chauthtok(pam_hand if ((child_pid = fork()) == 0) { char passphrase[ECRYPTFS_MAX_PASSWORD_LENGTH + 1]; - setuid(uid); + /* temp regain uid 0 to drop privs */ + seteuid(oeuid); + /* setgroups() already called */ + if (setgid(gid) < 0 || setuid(uid) < 0) + goto out_child; + if ((rc = ecryptfs_unwrap_passphrase(passphrase, wrapped_pw_filename, old_passphrase, salt))) { @@ -492,5 +541,11 @@ out_child: syslog(LOG_WARNING, "pam_ecryptfs: waitpid() returned with error condition\n"); free(wrapped_pw_filename); out: + + seteuid(oeuid); + setegid(oegid); + setgroups(ngids, groups); + +outnouid: return rc; } Index: ecryptfs-utils-96/src/utils/mount.ecryptfs_private.c =================================================================== --- ecryptfs-utils-96.orig/src/utils/mount.ecryptfs_private.c +++ ecryptfs-utils-96/src/utils/mount.ecryptfs_private.c @@ -302,7 +302,7 @@ int update_mtab(char *dev, char *mnt, ch goto fail_early; } - while (old_ent = getmntent(old_mtab)) { + while ((old_ent = getmntent(old_mtab))) { if (addmntent(new_mtab, old_ent) != 0) { perror("addmntent"); goto fail; @@ -535,6 +535,11 @@ int main(int argc, char *argv[]) { exit(1); } + if (strstr(alias, "..")) { + fputs("Invalid alias", stderr); + exit(1); + } + /* Lock the counter through the rest of the program */ fh_counter = lock_counter(pwd->pw_name, uid, alias); if (fh_counter == NULL) { @@ -627,7 +632,7 @@ int main(int argc, char *argv[]) { goto fail; } /* Perform mount */ - if (mount(src, ".", FSTYPE, 0, opt) == 0) { + if (mount(src, ".", FSTYPE, MS_NOSUID|MS_NODEV, opt) == 0) { if (update_mtab(src, dest, opt) != 0) { goto fail; } @@ -676,6 +681,7 @@ int main(int argc, char *argv[]) { */ setresuid(0,0,0); setresgid(0,0,0); + clearenv(); /* Since we're doing a lazy unmount anyway, just unmount the current * directory. This avoids a lot of complexity in dealing with race Index: ecryptfs-utils-96/src/utils/Makefile.am =================================================================== --- ecryptfs-utils-96.orig/src/utils/Makefile.am +++ ecryptfs-utils-96/src/utils/Makefile.am @@ -58,7 +58,9 @@ ecryptfs_generate_tpm_key_CFLAGS = $(AM_ ecryptfs_generate_tpm_key_LDADD = $(TSPI_LIBS) mount_ecryptfs_private_SOURCES = mount.ecryptfs_private.c +mount_ecryptfs_private_CFLAGS = $(AM_CFLAGS) -fpie mount_ecryptfs_private_LDADD = $(top_builddir)/src/libecryptfs/libecryptfs.la $(KEYUTILS_LIBS) +mount_ecryptfs_private_LDFLAGS = -pie ecryptfs_stat_SOURCES = ecryptfs-stat.c ecryptfs_stat_LDADD = $(top_builddir)/src/libecryptfs/libecryptfs.la
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