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Improve CLI command blacklist checking for the command manager action. Previously,

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it did not handle case or whitespace properly.  This made it possible for blacklisted
commands to get executed anyway.
(closes issue #12765)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@119742 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Russell Bryant
2008-06-02 14:39:45 +00:00
parent 59410a3f01
commit 8a9d52bc7f
1 changed files with 50 additions and 9 deletions
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59
main/manager.c
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@@ -130,9 +130,12 @@ static struct permalias {
{ 0, "none" },
};
static const char *command_blacklist[] = {
"module load",
"module unload",
#define MAX_BLACKLIST_CMD_LEN 2
static struct {
char *words[AST_MAX_CMD_LEN];
} command_blacklist[] = {
{{ "module", "load", NULL }},
{{ "module", "unload", NULL }},
};
struct mansession {
@@ -1681,6 +1684,41 @@ static int action_redirect(struct mansession *s, const struct message *m)
return 0;
}
static int check_blacklist(const char *cmd)
{
char *cmd_copy, *cur_cmd;
char *cmd_words[MAX_BLACKLIST_CMD_LEN] = { NULL, };
int i;
cmd_copy = ast_strdupa(cmd);
for (i = 0; i < MAX_BLACKLIST_CMD_LEN && (cur_cmd = strsep(&cmd_copy, " ")); i++) {
cur_cmd = ast_strip(cur_cmd);
if (ast_strlen_zero(cur_cmd)) {
i--;
continue;
}
cmd_words[i] = cur_cmd;
}
for (i = 0; i < ARRAY_LEN(command_blacklist); i++) {
int j, match = 1;
for (j = 0; command_blacklist[i].words[j]; j++) {
if (ast_strlen_zero(cmd_words[j]) || strcasecmp(cmd_words[j], command_blacklist[i].words[j])) {
match = 0;
break;
}
}
if (match) {
return 1;
}
}
return 0;
}
static char mandescr_command[] =
"Description: Run a CLI command.\n"
"Variables: (Names marked with * are required)\n"
@@ -1694,14 +1732,17 @@ static int action_command(struct mansession *s, const struct message *m)
const char *id = astman_get_header(m, "ActionID");
char *buf, *final_buf;
char template[] = "/tmp/ast-ami-XXXXXX"; /* template for temporary file */
int fd = mkstemp(template), i = 0;
int fd = mkstemp(template);
off_t l;
for (i = 0; i < sizeof(command_blacklist) / sizeof(command_blacklist[0]); i++) {
if (!strncmp(cmd, command_blacklist[i], strlen(command_blacklist[i]))) {
astman_send_error(s, m, "Command blacklisted");
return 0;
}
if (ast_strlen_zero(cmd)) {
astman_send_error(s, m, "No command provided");
return 0;
}
if (check_blacklist(cmd)) {
astman_send_error(s, m, "Command blacklisted");
return 0;
}
astman_append(s, "Response: Follows\r\nPrivilege: Command\r\n");