int open_config() {
FILE *fp = NULL;
char *line;
key_cmd *cmd;
confentry *lastnode = NULL, *newnode = NULL;
int lineno = 1, ret = 0;
size_t n = 0;
/* Allow the configuration file to be overridden */
if (!config)
config = CONFIG;
fp = fopen(config, "r");
if (fp == NULL) {
lprintf("Warning: could not open the configuration file %s: %s\n", config, strerror(errno));
return OK;
}
if (verbose > 1)
lprintf("Using configuration file %s\n", config);
while (!feof(fp) && (ret >=0)) {
line = NULL;
ret = getline(&line, &n, fp);
if ((ret > 0) && (proc_config(lineno, line, &cmd) == OK)) {
newnode = (confentry *)(malloc(sizeof(confentry)));
if (newnode == NULL) {
lprintf("Error: memory allocation failed\n");
close_config();
free(line);
return MEMERR;
}
newnode->cmd = cmd;
newnode->next = NULL;
if (list == NULL) {
list = newnode;
} else {
lastnode->next = newnode;
}
lastnode = newnode;
if (verbose > 1) {
lprintf("Config: ");
lprint_mask(cmd->keys);
lprintf(" -:- ");
print_etype(cmd->type);
lprintf(" -:- ");
print_attrs(cmd);
lprintf(" -:- %s\n", cmd->command);
}
}
free(line);
++lineno;
}
fclose(fp);
return OK;
}
static int
do_auth(struct login_ctx *ctx, const char *cmd)
{
struct duo_config cfg;
struct passwd *pw;
struct in_addr addr;
duo_t *duo;
duo_code_t code;
const char *config, *p, *duouser;
const char *ip, *host = NULL;
char buf[64];
int i, flags, ret, prompts, matched;
int headless = 0;
if ((pw = getpwuid(ctx->uid)) == NULL) {
die("Who are you?");
}
duouser = ctx->duouser ? ctx->duouser : pw->pw_name;
config = ctx->config ? ctx->config : DUO_CONF;
flags = 0;
duo_config_default(&cfg);
/* Load our private config. */
if ((i = duo_parse_config(config, __ini_handler, &cfg)) != 0 ||
(!cfg.apihost || !cfg.apihost[0] || !cfg.skey || !cfg.skey[0] ||
!cfg.ikey || !cfg.ikey[0])) {
switch (i) {
case -2:
fprintf(stderr, "%s must be readable only by "
"user '%s'\n", config, pw->pw_name);
break;
case -1:
fprintf(stderr, "Couldn't open %s: %s\n",
config, strerror(errno));
break;
case 0:
fprintf(stderr, "Missing host, ikey, or skey in %s\n",
config);
break;
default:
fprintf(stderr, "Parse error in %s, line %d\n",
config, i);
break;
}
/* Implicit "safe" failmode for local configuration errors */
if (cfg.failmode == DUO_FAIL_SAFE) {
return (EXIT_SUCCESS);
}
return (EXIT_FAILURE);
}
#ifdef OPENSSL_FIPS
/*
* When fips_mode is configured, invoke OpenSSL's FIPS_mode_set() API. Note
* that in some environments, FIPS may be enabled system-wide, causing FIPS
* operation to be enabled automatically when OpenSSL is initialized. The
* fips_mode option is an experimental feature allowing explicit entry to FIPS
* operation in cases where it isn't enabled globally at the OS level (for
* example, when integrating directly with the OpenSSL FIPS Object Module).
*/
if(!FIPS_mode_set(cfg.fips_mode)) {
/* The smallest size buff can be according to the openssl docs */
char buff[256];
int error = ERR_get_error();
ERR_error_string_n(error, buff, sizeof(buff));
duo_syslog(LOG_ERR, "Unable to start fips_mode: %s", buff);
return (EXIT_FAILURE);
}
#else
if(cfg.fips_mode) {
duo_syslog(LOG_ERR, "FIPS mode flag specified, but OpenSSL not built with FIPS support. Failing the auth.");
return (EXIT_FAILURE);
}
#endif
prompts = cfg.prompts;
/* Check group membership. */
matched = duo_check_groups(pw, cfg.groups, cfg.groups_cnt);
if (matched == -1) {
close_config(&cfg);
return (EXIT_FAILURE);
} else if (matched == 0) {
close_config(&cfg);
return (EXIT_SUCCESS);
}
/* Use GECOS field if called for */
if ((cfg.send_gecos || cfg.gecos_username_pos >= 0) && !ctx->duouser) {
if (strlen(pw->pw_gecos) > 0) {
if (cfg.gecos_username_pos >= 0) {
duouser = duo_split_at(pw->pw_gecos, cfg.gecos_delim, cfg.gecos_username_pos);
if (duouser == NULL || (strcmp(duouser, "") == 0)) {
duo_log(LOG_DEBUG, "Could not parse GECOS field", pw->pw_name, NULL, NULL);
duouser = pw->pw_name;
}
} else {
duouser = pw->pw_gecos;
}
} else {
duo_log(LOG_WARNING, "Empty GECOS field", pw->pw_name, NULL, NULL);
}
}
/* Check for remote login host */
if ((host = ip = getenv("SSH_CONNECTION")) != NULL ||
(host = ip = (char *)ctx->host) != NULL) {
if (inet_aton(ip, &addr)) {
strlcpy(buf, ip, sizeof(buf));
ip = strtok(buf, " ");
host = ip;
} else {
if (cfg.local_ip_fallback) {
host = duo_local_ip();
}
}
}
/* Try Duo auth. */
if ((duo = duo_open(cfg.apihost, cfg.ikey, cfg.skey,
"login_duo/" PACKAGE_VERSION,
cfg.noverify ? "" : cfg.cafile,
cfg.https_timeout, cfg.http_proxy)) == NULL) {
duo_log(LOG_ERR, "Couldn't open Duo API handle",
pw->pw_name, host, NULL);
close_config(&cfg);
return (EXIT_FAILURE);
}
/* Special handling for non-interactive sessions */
if ((p = getenv("SSH_ORIGINAL_COMMAND")) != NULL ||
!isatty(STDIN_FILENO)) {
/* Try to support automatic one-shot login */
duo_set_conv_funcs(duo, NULL, NULL, NULL);
flags = (DUO_FLAG_SYNC|DUO_FLAG_AUTO);
prompts = 1;
headless = 1;
} else if (cfg.autopush) { /* Special handling for autopush */
duo_set_conv_funcs(duo, NULL, __autopush_status_fn, NULL);
flags = (DUO_FLAG_SYNC|DUO_FLAG_AUTO);
}
if (cfg.accept_env) {
flags |= DUO_FLAG_ENV;
}
ret = EXIT_FAILURE;
for (i = 0; i < prompts; i++) {
code = duo_login(duo, duouser, host, flags,
cfg.pushinfo ? cmd : NULL, cfg.failmode);
if (code == DUO_FAIL) {
duo_log(LOG_WARNING, "Failed Duo login",
duouser, host, duo_geterr(duo));
if ((flags & DUO_FLAG_SYNC) == 0) {
printf("\n");
}
/* The autopush failed, fall back to regular process */
if (cfg.autopush && i == 0) {
flags = 0;
duo_reset_conv_funcs(duo);
}
/* Keep going */
continue;
}
/* Terminal conditions */
if (code == DUO_OK) {
if ((p = duo_geterr(duo)) != NULL) {
duo_log(LOG_WARNING, "Skipped Duo login",
duouser, host, p);
} else {
duo_log(LOG_INFO, "Successful Duo login",
duouser, host, NULL);
}
if (cfg.motd && !headless) {
_print_motd();
}
ret = EXIT_SUCCESS;
} else if (code == DUO_ABORT) {
duo_log(LOG_WARNING, "Aborted Duo login",
duouser, host, duo_geterr(duo));
} else if (code == DUO_FAIL_SAFE_ALLOW) {
duo_log(LOG_WARNING, "Failsafe Duo login",
duouser, host, duo_geterr(duo));
ret = EXIT_SUCCESS;
} else if (code == DUO_FAIL_SECURE_DENY) {
duo_log(LOG_WARNING, "Failsecure Duo login",
duouser, host, duo_geterr(duo));
} else {
duo_log(LOG_ERR, "Error in Duo login",
duouser, host, duo_geterr(duo));
}
break;
}
duo_close(duo);
close_config(&cfg);
return (ret);
}
