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102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/* This file is part of pam-modules.
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Copyright (C) 2009-2022 Sergey Poznyakoff
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <graypam.h>
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#include "wordsplit/wordsplit.h"
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struct keyword *
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gray_find_keyword(struct keyword *kwtab, const char *str, size_t len)
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{
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for (; kwtab->name; kwtab++)
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if (kwtab->len == len
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&& strncmp(kwtab->name, str, kwtab->len) == 0)
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return kwtab;
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return NULL;
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}
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static struct keyword vartab[] = {
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DCL("service", PAM_SERVICE),
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DCL("user", PAM_USER),
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DCL("tty", PAM_TTY),
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DCL("rhost", PAM_RHOST),
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DCL("ruser", PAM_RUSER),
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DCL("prompt", PAM_USER_PROMPT),
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DCL("password", PAM_AUTHTOK),
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{ NULL }
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};
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static int
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get_pam_var(char **ret, const char *var, size_t len, void *clos)
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{
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pam_handle_t *pamh = clos;
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struct keyword *kw;
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char const *val;
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int rc;
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char *s;
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kw = gray_find_keyword(vartab, var, len);
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if (!kw)
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return WRDSE_UNDEF;
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rc = pam_get_item(pamh, kw->code, (const void**) &val);
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if (rc) {
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_pam_log(LOG_ERR,
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"cannot obtain variable %s: %s",
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kw->name, pam_strerror(pamh, rc));
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return WRDSE_UNDEF;
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}
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if (!val) {
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val = "";
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}
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s = strdup(val);
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if (!s)
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return WRDSE_NOSPACE;
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*ret = s;
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return WRDSE_OK;
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}
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int
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gray_expand_string(pam_handle_t *pamh, const char *str, char **output_ptr)
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{
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struct wordsplit ws;
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int wsflags = WRDSF_NOSPLIT
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| WRDSF_GETVAR
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| WRDSF_CLOSURE
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| WRDSF_NOCMD
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| WRDSF_UNDEF;
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int rc;
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ws.ws_getvar = get_pam_var;
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ws.ws_closure = pamh;
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rc = wordsplit(str, &ws, wsflags);
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if (rc) {
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if (ws.ws_errctx)
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_pam_log(LOG_ERR,
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"string split: %s: %s",
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wordsplit_strerror (&ws), ws.ws_errctx);
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else
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_pam_log(LOG_ERR,
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"string split: %s",
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wordsplit_strerror (&ws));
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rc = (rc == WRDSE_NOSPACE) ? PAM_BUF_ERR : PAM_SERVICE_ERR;
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} else {
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*output_ptr = ws.ws_wordv[0];
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ws.ws_wordv[0] = NULL;
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}
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wordsplit_free(&ws);
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return rc;
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}
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