Major cleanup.
git-svn-id: svn+ssh://svn.openpam.org/svn/openpam/trunk@700 185d5e19-27fe-0310-9dcf-9bff6b9f3609
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@ -51,8 +51,14 @@
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enum pam_oath_nokey { nokey_error = -1, nokey_fail, nokey_fake, nokey_ignore };
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static const char *pam_oath_default_keyfile = "/var/oath/%u.otpauth";
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/*
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* Parse the nokey or badkey option, which indicates how we should act if
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* the user has no keyfile or the keyfile is invalid.
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*/
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static enum pam_oath_nokey
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get_nokey_option(pam_handle_t *pamh, const char *option)
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pam_oath_nokey_option(pam_handle_t *pamh, const char *option)
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{
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const char *value;
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@ -69,6 +75,54 @@ get_nokey_option(pam_handle_t *pamh, const char *option)
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return (nokey_error);
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}
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/*
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* Determine the location of the user's keyfile.
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*/
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static char *
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pam_oath_keyfile(pam_handle_t *pamh)
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{
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const char *keyfile;
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char *path;
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size_t size;
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if ((keyfile = openpam_get_option(pamh, "keyfile")) == NULL)
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keyfile = pam_oath_default_keyfile;
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size = 0;
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if (openpam_subst(pamh, NULL, &size, keyfile) != PAM_TRY_AGAIN)
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return (NULL);
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if ((path = malloc(size)) == NULL)
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return (NULL);
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if (openpam_subst(pamh, path, &size, keyfile) != PAM_SUCCESS) {
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free(path);
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return (NULL);
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}
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return (path);
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}
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/*
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* Load the user's key.
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*/
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static struct oath_key *
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pam_oath_load_key(const char *keyfile)
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{
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/* XXX should check ownership and permissions */
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return (oath_key_from_file(keyfile));
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}
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/*
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* Save the user's key.
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*/
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static int
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pam_oath_save_key(const struct oath_key *key, const char *keyfile)
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{
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/* not implemented */
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(void)key;
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(void)keyfile;
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return (0);
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}
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PAM_EXTERN int
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pam_sm_authenticate(pam_handle_t *pamh, int flags,
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int argc, const char *argv[])
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@ -87,25 +141,35 @@ pam_sm_authenticate(pam_handle_t *pamh, int flags,
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(void)argc;
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(void)argv;
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keyfile = NULL;
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key = NULL;
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openpam_log(PAM_LOG_VERBOSE, "attempting OATH authentication");
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/* check how to behave if the user does not have a valid key */
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if ((nokey = get_nokey_option(pamh, "nokey")) == nokey_error ||
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(badkey = get_nokey_option(pamh, "badkey")) == nokey_error)
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return (PAM_SERVICE_ERR);
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if ((nokey = pam_oath_nokey_option(pamh, "nokey")) == nokey_error ||
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(badkey = pam_oath_nokey_option(pamh, "badkey")) == nokey_error) {
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pam_err = PAM_SERVICE_ERR;
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goto done;
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}
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/* identify user */
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if ((pam_err = pam_get_user(pamh, &user, NULL)) != PAM_SUCCESS)
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return (pam_err);
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if ((pwd = getpwnam(user)) == NULL)
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return (PAM_USER_UNKNOWN);
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goto done;
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if ((pwd = getpwnam(user)) == NULL) {
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pam_err = PAM_USER_UNKNOWN;
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goto done;
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}
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openpam_log(PAM_LOG_VERBOSE, "authenticating user %s", user);
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/* load key */
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/* XXX implement additional schemes */
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keyfile = calloc(1, strlen(pwd->pw_dir) + sizeof "/.otpauth");
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if (keyfile == NULL)
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return (PAM_SYSTEM_ERR);
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sprintf(keyfile, "%s/.otpauth", pwd->pw_dir);
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key = oath_key_from_file(keyfile);
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free(keyfile);
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if ((keyfile = pam_oath_keyfile(pamh)) == NULL) {
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pam_err = PAM_SYSTEM_ERR;
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goto done;
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}
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openpam_log(PAM_LOG_VERBOSE, "attempting to load %s for %s", keyfile, user);
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key = pam_oath_load_key(keyfile);
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/*
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* The user doesn't have a key, should we fake it?
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@ -113,19 +177,25 @@ pam_sm_authenticate(pam_handle_t *pamh, int flags,
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* XXX implement badkey - currently, oath_key_from_file() doesn't
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* provide enough information for us to tell the difference
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* between a bad key and no key at all.
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*
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* XXX move this into pam_oath_load_key()
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*/
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if (key == NULL) {
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openpam_log(PAM_LOG_VERBOSE, "no key found for %s", user);
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switch (nokey) {
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case nokey_fail:
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return (PAM_AUTHINFO_UNAVAIL);
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pam_err = PAM_AUTHINFO_UNAVAIL;
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goto done;
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case nokey_fake:
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key = oath_key_dummy(om_hotp, oh_sha1, 6);
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break;
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case nokey_ignore:
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return (PAM_IGNORE);
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pam_err = PAM_IGNORE;
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goto done;
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default:
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/* can't happen */
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return (PAM_SERVICE_ERR);
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pam_err = PAM_SERVICE_ERR;
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goto done;
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}
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}
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@ -133,8 +203,8 @@ pam_sm_authenticate(pam_handle_t *pamh, int flags,
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pam_err = pam_get_authtok(pamh, PAM_AUTHTOK,
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(const char **)&password, PAM_OATH_PROMPT);
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if (pam_err != PAM_SUCCESS) {
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oath_key_free(key);
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return (pam_err);
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openpam_log(PAM_LOG_VERBOSE, "conversation failure");
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goto done;
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}
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/* convert to number */
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@ -147,12 +217,25 @@ pam_sm_authenticate(pam_handle_t *pamh, int flags,
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ret = oath_hotp_match(key, response, 1);
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else
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ret = oath_totp_match(key, response, 1);
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oath_key_free(key);
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if (ret != 1)
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return (PAM_AUTH_ERR);
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openpam_log(PAM_LOG_VERBOSE, "verification code %s",
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ret ? "matched" : "did not match");
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if (ret == 0) {
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pam_err = PAM_AUTH_ERR;
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goto done;
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}
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/* XXX write back */
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return (PAM_SUCCESS);
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/* write back (update counter for HOTP etc) */
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if (pam_oath_save_key(key, keyfile) != 0) {
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pam_err = PAM_SYSTEM_ERR;
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goto done;
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}
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openpam_log(PAM_LOG_VERBOSE, "OATH authentication succeeded");
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pam_err = PAM_SUCCESS;
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done:
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oath_key_free(key);
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free(keyfile);
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return (pam_err);
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}
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PAM_EXTERN int
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