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/* credentials.c -- wrap configurable access to .netrc or similar files.
*
* This code is Copyright (c) 2013, by the authors of nmh. See the
* COPYRIGHT file in the root directory of the nmh distribution for
* complete copyright information.
*/
#include "h/mh.h"
#include "concat.h"
#include "ruserpass.h"
#include "credentials.h"
#include "context_find.h"
#include "error.h"
#include "utils.h"
#include "mts.h"
#include "m_maildir.h"
#include "globals.h"
struct nmh_creds {
char *host; /* Hostname corresponding to credentials */
char *user; /* Username corresponding to credentials */
char *pass; /* (Optional) password used by credentials */
};
void
init_credentials_file(void)
{
if (credentials_file == NULL) {
char *cred_style = context_find ("credentials");
if (cred_style == NULL || ! strcmp (cred_style, "legacy")) {
char *hdir = getenv ("HOME");
credentials_file = concat (hdir ? hdir : ".", "/.netrc", NULL);
} else if (! strncasecmp (cred_style, "file:", 5) ||
! strncasecmp (cred_style, "file-nopermcheck:", 17)) {
struct stat st;
char *filename = strchr(cred_style, ':') + 1;
while (isspace((unsigned char)*filename))
filename++;
if (*filename == '/') {
credentials_file = filename;
} else {
credentials_file = m_maildir (filename);
if (stat (credentials_file, &st) != OK) {
credentials_file =
concat (mypath ? mypath : ".", "/", filename, NULL);
if (stat (credentials_file, &st) != OK) {
inform("unable to find credentials file %s, continuing...",
filename);
}
}
}
if (! strncasecmp (cred_style, "file-nopermcheck:", 17))
credentials_no_perm_check = 1;
}
}
}
nmh_creds_t
nmh_get_credentials (const char *host, const char *user)
{
nmh_creds_t creds;
char *cred_style = context_find ("credentials");
init_credentials_file ();
creds = mh_xmalloc(sizeof(*creds));
creds->host = mh_xstrdup(host);
creds->user = NULL;
creds->pass = NULL;
if (cred_style == NULL || ! strcmp (cred_style, "legacy")) {
creds->user = user == NULL ? mh_xstrdup(getusername (1)) : mh_xstrdup(user);
} else if (! strncasecmp (cred_style, "file:", 5) ||
! strncasecmp (cred_style, "file-nopermcheck:", 17)) {
/*
* Determine user using the first of:
* 1) -user switch
* 2) matching host entry with login in a credentials file
* such as ~/.netrc
* 3) interactively request from user (as long as the
* credentials file didn't have a "default" token)
*/
creds->user = user == NULL ? NULL : mh_xstrdup(user);
} else {
inform("unknown credentials style %s, continuing...", cred_style);
return NULL;
}
ruserpass(creds->host, &creds->user, &creds->pass,
RUSERPASS_NO_PROMPT_USER | RUSERPASS_NO_PROMPT_PASSWORD);
return creds;
}
/*
* Retrieve the username
*/
const char *
nmh_cred_get_user(nmh_creds_t creds)
{
if (! creds->user) {
ruserpass(creds->host, &creds->user, &creds->pass,
RUSERPASS_NO_PROMPT_PASSWORD);
}
return creds->user;
}
/*
* Retrieve the password
*/
const char *
nmh_cred_get_password(nmh_creds_t creds)
{
if (! creds->pass) {
ruserpass(creds->host, &creds->user, &creds->pass, 0);
}
return creds->pass;
}
/*
* Free our credentials
*/
void
nmh_credentials_free(nmh_creds_t creds)
{
free(creds->host);
free(creds->user);
if (creds->pass) {
memset(creds->pass, 0, strlen(creds->pass));
free(creds->pass);
}
free(creds);
}
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