/*
* Read a line from the temp file and verify that the result matches our
* expectations: whether a line was read at all, how many and which words
* it contained, how many lines were read (in case of quoted or escaped
* newlines) and whether we reached the end of the file.
*/
static int
orlv_expect(const char **expectedv, int lines, int eof)
{
int expectedc, gotc, i, lineno = 0;
char **gotv;
expectedc = 0;
if (expectedv != NULL)
while (expectedv[expectedc] != NULL)
++expectedc;
gotv = openpam_readlinev(f, &lineno, &gotc);
if (ferror(f))
err(1, "%s(): %s", __func__, filename);
if (expectedv != NULL && gotv == NULL) {
t_verbose("expected %d words, got nothing\n", expectedc);
return (0);
}
if (expectedv == NULL && gotv != NULL) {
t_verbose("expected nothing, got %d words\n", gotc);
FREEV(gotc, gotv);
return (0);
}
if (expectedv != NULL && gotv != NULL) {
if (expectedc != gotc) {
t_verbose("expected %d words, got %d\n",
expectedc, gotc);
FREEV(gotc, gotv);
return (0);
}
for (i = 0; i < gotc; ++i) {
if (strcmp(expectedv[i], gotv[i]) != 0) {
t_verbose("word %d: expected <<%s>>, "
"got <<%s>>\n", i, expectedv[i], gotv[i]);
FREEV(gotc, gotv);
return (0);
}
}
FREEV(gotc, gotv);
}
if (lineno != lines) {
t_verbose("expected to advance %d lines, advanced %d lines\n",
lines, lineno);
return (0);
}
if (eof && !feof(f)) {
t_verbose("expected EOF, but didn't get it\n");
return (0);
}
if (!eof && feof(f)) {
t_verbose("didn't expect EOF, but got it anyway\n");
return (0);
}
return (1);
}
void
write_ticket(const char* user, const char* data)
{
int fd, ret, word_count;
FILE *f, *t;
char **words;
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
if ((fd = open_ticket(O_RDWR|O_CREAT|O_EXLOCK)) < 0 ||
(f = fdopen(fd, "r")) == NULL) {
if (fd >= 0)
close(fd);
return;
}
char temp_path[strlen(AUTH_TICKET_PATH) + 7 + 1];
if (sprintf(temp_path, "%s.XXXXXX", AUTH_TICKET_PATH) < 0)
goto done;
if ((ret = mkstemp(temp_path)) == -1 ||
(t = fopen(temp_path, "w")) == NULL) {
if (ret != -1)
unlink(temp_path);
goto done;
}
ret = 0;
while ((words = openpam_readlinev(f, NULL, &word_count)) != NULL) {
if (word_count == 3 && strcmp(user, words[0]) != 0)
ret = fprintf(t, "%s %s %s\n",
words[0], words[1], words[2]);
for(int i = 0; i < word_count; i++)
free(words[i]);
free(words);
if (ret < 0)
break;
}
if (ret >= 0)
ret = fprintf(t, "%s %s %d\n", user, data, (int)now.tv_sec);
if (fclose(t) == 0) {
if (ret >= 0 && rename(temp_path, AUTH_TICKET_PATH) == 0) {
ftruncate(fd, 0);
goto done;
}
}
truncate(temp_path, 0);
unlink(temp_path);
done:
fclose(f);
}
static bool
read_ticket(const char *user, int *timestamp, char **password)
{
int fd, word_count;
FILE *f;
char **words;
bool success = false;
if ((fd = open_ticket(O_RDONLY|O_SHLOCK)) < 0 ||
(f = fdopen(fd, "r")) == NULL) {
if (fd >= 0)
close(fd);
return (false);
}
words = openpam_readlinev(f, NULL, &word_count);
while (words != NULL) {
if (word_count != 3 || strcmp(user, words[0]) != 0) {
for(int i = 0; i < word_count; i++) {
free(words[i]);
}
free(words);
words = openpam_readlinev(f, NULL, &word_count);
continue;
}
*password = words[1];
const char *err;
*timestamp = strtonum(words[2], 0, INT_MAX - TIMEOUT, &err);
success = (err == NULL);
free(words[0]);
free(words[2]);
free(words);
words = NULL;
}
fclose(f);
return (success);
}
/*
* Extracts given chains from a policy file.
*
* Returns the number of policy entries which were found for the specified
* service and facility, or -1 if a system error occurred or a syntax
* error was encountered.
*/
static int
openpam_parse_chain(pam_handle_t *pamh,
const char *service,
pam_facility_t facility,
FILE *f,
const char *filename,
openpam_style_t style)
{
pam_chain_t *this, **next;
pam_facility_t fclt;
pam_control_t ctlf;
char *name, *servicename, *modulename;
int count, lineno, ret, serrno;
char **wordv, *word;
int i, wordc;
count = 0;
this = NULL;
name = NULL;
lineno = 0;
wordc = 0;
wordv = NULL;
while ((wordv = openpam_readlinev(f, &lineno, &wordc)) != NULL) {
/* blank line? */
if (wordc == 0) {
FREEV(wordc, wordv);
continue;
}
i = 0;
/* check service name if necessary */
if (style == pam_conf_style &&
strcmp(wordv[i++], service) != 0) {
FREEV(wordc, wordv);
continue;
}
/* check facility name */
if ((word = wordv[i++]) == NULL ||
(fclt = parse_facility_name(word)) == (pam_facility_t)-1) {
openpam_log(PAM_LOG_ERROR,
"%s(%d): missing or invalid facility",
filename, lineno);
errno = EINVAL;
goto fail;
}
if (facility != fclt && facility != PAM_FACILITY_ANY) {
FREEV(wordc, wordv);
continue;
}
/* check for "include" */
if ((word = wordv[i++]) != NULL &&
strcmp(word, "include") == 0) {
if ((servicename = wordv[i++]) == NULL ||
!valid_service_name(servicename)) {
openpam_log(PAM_LOG_ERROR,
"%s(%d): missing or invalid service name",
filename, lineno);
errno = EINVAL;
goto fail;
}
if (wordv[i] != NULL) {
openpam_log(PAM_LOG_ERROR,
"%s(%d): garbage at end of line",
filename, lineno);
errno = EINVAL;
goto fail;
}
ret = openpam_load_chain(pamh, servicename, fclt);
FREEV(wordc, wordv);
if (ret < 0) {
/*
* Bogus errno, but this ensures that the
* outer loop does not just ignore the
* error and keep searching.
*/
if (errno == ENOENT)
errno = EINVAL;
goto fail;
}
continue;
}
/* get control flag */
if (word == NULL || /* same word we compared to "include" */
(ctlf = parse_control_flag(word)) == (pam_control_t)-1) {
openpam_log(PAM_LOG_ERROR,
"%s(%d): missing or invalid control flag",
filename, lineno);
errno = EINVAL;
goto fail;
}
/* get module name */
if ((modulename = wordv[i++]) == NULL ||
!valid_module_name(modulename)) {
openpam_log(PAM_LOG_ERROR,
"%s(%d): missing or invalid module name",
filename, lineno);
errno = EINVAL;
goto fail;
}
/* allocate new entry */
if ((this = calloc(1, sizeof *this)) == NULL)
goto syserr;
this->flag = ctlf;
/* load module */
if ((this->module = openpam_load_module(modulename)) == NULL) {
if (errno == ENOENT)
errno = ENOEXEC;
goto fail;
}
/*
* The remaining items in wordv are the module's
* arguments. We could set this->optv = wordv + i, but
* then free(this->optv) wouldn't work. Instead, we free
* the words we've already consumed, shift the rest up,
* and clear the tail end of the array.
*/
this->optc = wordc - i;
for (i = 0; i < wordc - this->optc; ++i) {
FREE(wordv[i]);
}
for (i = 0; i < this->optc; ++i) {
wordv[i] = wordv[wordc - this->optc + i];
wordv[wordc - this->optc + i] = NULL;
}
this->optv = wordv;
wordv = NULL;
wordc = 0;
/* hook it up */
for (next = &pamh->chains[fclt]; *next != NULL;
next = &(*next)->next)
/* nothing */ ;
*next = this;
this = NULL;
++count;
}
/*
* The loop ended because openpam_readword() returned NULL, which
* can happen for four different reasons: an I/O error (ferror(f)
* is true), a memory allocation failure (ferror(f) is false,
* feof(f) is false, errno is non-zero), the file ended with an
* unterminated quote or backslash escape (ferror(f) is false,
* feof(f) is true, errno is non-zero), or the end of the file was
* reached without error (ferror(f) is false, feof(f) is true,
* errno is zero).
*/
if (ferror(f) || errno != 0)
goto syserr;
if (!feof(f))
goto fail;
fclose(f);
return (count);
syserr:
serrno = errno;
openpam_log(PAM_LOG_ERROR, "%s: %m", filename);
errno = serrno;
/* fall through */
fail:
serrno = errno;
if (this && this->optc && this->optv)
FREEV(this->optc, this->optv);
FREE(this);
FREEV(wordc, wordv);
FREE(wordv);
FREE(name);
fclose(f);
errno = serrno;
return (-1);
}
