CURLcode
curl_easy_perform(CURL *curl)
{
int rc;
CURLcode err=CURLE_OK;
const char *errstr=NULL;
char *proxy=NULL;
struct http_srv srv;
memset(&srv,0,sizeof(srv));
/* Emulate the libcurl proxy behavior. If the calling program set a
proxy, use it. If it didn't set a proxy or set it to NULL, check
for one in the environment. If the calling program explicitly
set a null-string proxy the http code doesn't use a proxy at
all. */
if(curl->proxy)
proxy=curl->proxy;
else
proxy=getenv(HTTP_PROXY_ENV);
if(curl->srvtag)
srv.srvtag=curl->srvtag;
if(curl->flags.verbose)
{
fprintf(curl->errors,"* HTTP proxy is \"%s\"\n",proxy?proxy:"null");
fprintf(curl->errors,"* HTTP URL is \"%s\"\n",curl->url);
if(srv.srvtag)
fprintf(curl->errors,
"* SRV tag is \"%s\": host and port may be overridden\n",
srv.srvtag);
fprintf(curl->errors,"* HTTP auth is \"%s\"\n",
curl->auth?curl->auth:"null");
fprintf(curl->errors,"* HTTP method is %s\n",
curl->flags.post?"POST":"GET");
}
if(curl->flags.post)
{
rc=http_open(&curl->hd,HTTP_REQ_POST,curl->url,curl->auth,0,proxy,
&srv,curl->headers?curl->headers->list:NULL);
if(rc==0)
{
char content_len[50];
unsigned int post_len=strlen(curl->postfields);
if(curl->flags.verbose && srv.used_server && srv.used_port)
fprintf (curl->errors, "* HTTP host:port post-SRV is \"%s:%hu\"\n",
srv.used_server, srv.used_port);
iobuf_writestr(curl->hd.fp_write,
"Content-Type: application/x-www-form-urlencoded\r\n");
sprintf(content_len,"Content-Length: %u\r\n",post_len);
iobuf_writestr(curl->hd.fp_write,content_len);
http_start_data(&curl->hd);
iobuf_write(curl->hd.fp_write,curl->postfields,post_len);
rc=http_wait_response(&curl->hd,&curl->status);
if(rc==0 && curl->flags.failonerror && curl->status>=300)
err=CURLE_HTTP_RETURNED_ERROR;
}
}
else
{
rc=http_open(&curl->hd,HTTP_REQ_GET,curl->url,curl->auth,0,proxy,
&srv,curl->headers?curl->headers->list:NULL);
if(rc==0)
{
if(curl->flags.verbose && srv.used_server && srv.used_port)
fprintf (curl->errors, "* HTTP host:port post-SRV is \"%s:%hu\"\n",
srv.used_server, srv.used_port);
rc=http_wait_response(&curl->hd,&curl->status);
if(rc==0)
{
if(curl->flags.failonerror && curl->status>=300)
err=CURLE_HTTP_RETURNED_ERROR;
else
{
unsigned int maxlen=1024,buflen,len;
byte *line=NULL;
while((len=iobuf_read_line(curl->hd.fp_read,
&line,&buflen,&maxlen)))
{
size_t ret;
maxlen=1024;
ret=(curl->writer)(line,len,1,curl->file);
if(ret!=len)
{
err=CURLE_WRITE_ERROR;
break;
}
}
xfree(line);
http_close(&curl->hd);
}
}
else
http_close(&curl->hd);
}
}
free (srv.used_server);
switch(rc)
{
case 0:
break;
case G10ERR_INVALID_URI:
err=CURLE_UNSUPPORTED_PROTOCOL;
break;
case G10ERR_NETWORK:
errstr=strerror(errno);
err=CURLE_COULDNT_CONNECT;
break;
default:
errstr=g10_errstr(rc);
err=CURLE_COULDNT_CONNECT;
break;
}
return handle_error(curl,err,errstr);
}
/* Send an HTTP request. On success returns an estream object at
R_FP. HOSTPORTSTR is only used for diagnostics. If HTTPHOST is
not NULL it will be used as HTTP "Host" header. If POST_CB is not
NULL a post request is used and that callback is called to allow
writing the post data. */
static gpg_error_t
send_request (ctrl_t ctrl, const char *request, const char *hostportstr,
const char *httphost, unsigned int httpflags,
gpg_error_t (*post_cb)(void *, http_t), void *post_cb_value,
estream_t *r_fp)
{
gpg_error_t err;
http_session_t session = NULL;
http_t http = NULL;
int redirects_left = MAX_REDIRECTS;
estream_t fp = NULL;
char *request_buffer = NULL;
*r_fp = NULL;
err = http_session_new (&session, NULL);
if (err)
goto leave;
http_session_set_log_cb (session, cert_log_cb);
once_more:
err = http_open (&http,
post_cb? HTTP_REQ_POST : HTTP_REQ_GET,
request,
httphost,
/* fixme: AUTH */ NULL,
(httpflags | (opt.honor_http_proxy? HTTP_FLAG_TRY_PROXY:0)),
ctrl->http_proxy,
session,
NULL,
/*FIXME curl->srvtag*/NULL);
if (!err)
{
fp = http_get_write_ptr (http);
/* Avoid caches to get the most recent copy of the key. We set
both the Pragma and Cache-Control versions of the header, so
we're good with both HTTP 1.0 and 1.1. */
es_fputs ("Pragma: no-cache\r\n"
"Cache-Control: no-cache\r\n", fp);
if (post_cb)
err = post_cb (post_cb_value, http);
if (!err)
{
http_start_data (http);
if (es_ferror (fp))
err = gpg_error_from_syserror ();
}
}
if (err)
{
/* Fixme: After a redirection we show the old host name. */
log_error (_("error connecting to '%s': %s\n"),
hostportstr, gpg_strerror (err));
goto leave;
}
/* Wait for the response. */
dirmngr_tick (ctrl);
err = http_wait_response (http);
if (err)
{
log_error (_("error reading HTTP response for '%s': %s\n"),
hostportstr, gpg_strerror (err));
goto leave;
}
if (http_get_tls_info (http, NULL))
{
/* Update the httpflags so that a redirect won't fallback to an
unencrypted connection. */
httpflags |= HTTP_FLAG_FORCE_TLS;
}
switch (http_get_status_code (http))
{
case 200:
err = 0;
break; /* Success. */
case 301:
case 302:
case 307:
{
const char *s = http_get_header (http, "Location");
log_info (_("URL '%s' redirected to '%s' (%u)\n"),
request, s?s:"[none]", http_get_status_code (http));
if (s && *s && redirects_left-- )
{
xfree (request_buffer);
request_buffer = xtrystrdup (s);
if (request_buffer)
{
request = request_buffer;
http_close (http, 0);
http = NULL;
goto once_more;
}
err = gpg_error_from_syserror ();
}
else
err = gpg_error (GPG_ERR_NO_DATA);
log_error (_("too many redirections\n"));
}
goto leave;
default:
log_error (_("error accessing '%s': http status %u\n"),
request, http_get_status_code (http));
err = gpg_error (GPG_ERR_NO_DATA);
goto leave;
}
/* FIXME: We should register a permanent redirection and whether a
host has ever used TLS so that future calls will always use
TLS. */
fp = http_get_read_ptr (http);
if (!fp)
{
err = gpg_error (GPG_ERR_BUG);
goto leave;
}
/* Return the read stream and close the HTTP context. */
*r_fp = fp;
http_close (http, 1);
http = NULL;
leave:
http_close (http, 0);
http_session_release (session);
xfree (request_buffer);
return err;
}
/* Get the key from URL which is expected to specify a http style
scheme. On success R_FP has an open stream to read the data. */
gpg_error_t
ks_http_fetch (ctrl_t ctrl, const char *url, estream_t *r_fp)
{
gpg_error_t err;
http_session_t session = NULL;
http_t http = NULL;
int redirects_left = MAX_REDIRECTS;
estream_t fp = NULL;
char *request_buffer = NULL;
err = http_session_new (&session, NULL);
if (err)
goto leave;
http_session_set_log_cb (session, cert_log_cb);
*r_fp = NULL;
once_more:
err = http_open (&http,
HTTP_REQ_GET,
url,
/* httphost */ NULL,
/* fixme: AUTH */ NULL,
0,
/* fixme: proxy*/ NULL,
session,
NULL,
/*FIXME curl->srvtag*/NULL);
if (!err)
{
fp = http_get_write_ptr (http);
/* Avoid caches to get the most recent copy of the key. We set
both the Pragma and Cache-Control versions of the header, so
we're good with both HTTP 1.0 and 1.1. */
es_fputs ("Pragma: no-cache\r\n"
"Cache-Control: no-cache\r\n", fp);
http_start_data (http);
if (es_ferror (fp))
err = gpg_error_from_syserror ();
}
if (err)
{
/* Fixme: After a redirection we show the old host name. */
log_error (_("error connecting to '%s': %s\n"),
url, gpg_strerror (err));
goto leave;
}
/* Wait for the response. */
dirmngr_tick (ctrl);
err = http_wait_response (http);
if (err)
{
log_error (_("error reading HTTP response for '%s': %s\n"),
url, gpg_strerror (err));
goto leave;
}
switch (http_get_status_code (http))
{
case 200:
err = 0;
break; /* Success. */
case 301:
case 302:
case 307:
{
const char *s = http_get_header (http, "Location");
log_info (_("URL '%s' redirected to '%s' (%u)\n"),
url, s?s:"[none]", http_get_status_code (http));
if (s && *s && redirects_left-- )
{
xfree (request_buffer);
request_buffer = xtrystrdup (s);
if (request_buffer)
{
url = request_buffer;
http_close (http, 0);
http = NULL;
goto once_more;
}
err = gpg_error_from_syserror ();
}
else
err = gpg_error (GPG_ERR_NO_DATA);
log_error (_("too many redirections\n"));
}
goto leave;
default:
log_error (_("error accessing '%s': http status %u\n"),
url, http_get_status_code (http));
err = gpg_error (GPG_ERR_NO_DATA);
goto leave;
}
fp = http_get_read_ptr (http);
if (!fp)
{
err = gpg_error (GPG_ERR_BUG);
goto leave;
}
/* Return the read stream and close the HTTP context. */
*r_fp = fp;
http_close (http, 1);
http = NULL;
leave:
http_close (http, 0);
http_session_release (session);
xfree (request_buffer);
return err;
}
/* Construct an OCSP request, send it to the configured OCSP responder
and parse the response. On success the OCSP context may be used to
further process the reponse. */
static gpg_error_t
do_ocsp_request (ctrl_t ctrl, ksba_ocsp_t ocsp, gcry_md_hd_t md,
const char *url, ksba_cert_t cert, ksba_cert_t issuer_cert)
{
gpg_error_t err;
unsigned char *request, *response;
size_t requestlen, responselen;
http_t http;
ksba_ocsp_response_status_t response_status;
const char *t;
int redirects_left = 2;
char *free_this = NULL;
(void)ctrl;
if (opt.disable_http)
{
log_error (_("OCSP request not possible due to disabled HTTP\n"));
return gpg_error (GPG_ERR_NOT_SUPPORTED);
}
err = ksba_ocsp_add_target (ocsp, cert, issuer_cert);
if (err)
{
log_error (_("error setting OCSP target: %s\n"), gpg_strerror (err));
return err;
}
{
size_t n;
unsigned char nonce[32];
n = ksba_ocsp_set_nonce (ocsp, NULL, 0);
if (n > sizeof nonce)
n = sizeof nonce;
gcry_create_nonce (nonce, n);
ksba_ocsp_set_nonce (ocsp, nonce, n);
}
err = ksba_ocsp_build_request (ocsp, &request, &requestlen);
if (err)
{
log_error (_("error building OCSP request: %s\n"), gpg_strerror (err));
return err;
}
once_more:
err = http_open (&http, HTTP_REQ_POST, url, NULL,
(opt.honor_http_proxy? HTTP_FLAG_TRY_PROXY:0),
opt.http_proxy, NULL, NULL, NULL);
if (err)
{
log_error (_("error connecting to '%s': %s\n"), url, gpg_strerror (err));
xfree (free_this);
return err;
}
es_fprintf (http_get_write_ptr (http),
"Content-Type: application/ocsp-request\r\n"
"Content-Length: %lu\r\n",
(unsigned long)requestlen );
http_start_data (http);
if (es_fwrite (request, requestlen, 1, http_get_write_ptr (http)) != 1)
{
err = gpg_error_from_errno (errno);
log_error ("error sending request to '%s': %s\n", url, strerror (errno));
http_close (http, 0);
xfree (request);
xfree (free_this);
return err;
}
xfree (request);
request = NULL;
err = http_wait_response (http);
if (err || http_get_status_code (http) != 200)
{
if (err)
log_error (_("error reading HTTP response for '%s': %s\n"),
url, gpg_strerror (err));
else
{
switch (http_get_status_code (http))
{
case 301:
case 302:
{
const char *s = http_get_header (http, "Location");
log_info (_("URL '%s' redirected to '%s' (%u)\n"),
url, s?s:"[none]", http_get_status_code (http));
if (s && *s && redirects_left-- )
{
xfree (free_this); url = NULL;
free_this = xtrystrdup (s);
if (!free_this)
err = gpg_error_from_errno (errno);
else
{
url = free_this;
http_close (http, 0);
goto once_more;
}
}
else
err = gpg_error (GPG_ERR_NO_DATA);
log_error (_("too many redirections\n"));
}
break;
default:
log_error (_("error accessing '%s': http status %u\n"),
url, http_get_status_code (http));
err = gpg_error (GPG_ERR_NO_DATA);
break;
}
}
http_close (http, 0);
xfree (free_this);
return err;
}
err = read_response (http_get_read_ptr (http), &response, &responselen);
http_close (http, 0);
if (err)
{
log_error (_("error reading HTTP response for '%s': %s\n"),
url, gpg_strerror (err));
xfree (free_this);
return err;
}
err = ksba_ocsp_parse_response (ocsp, response, responselen,
&response_status);
if (err)
{
log_error (_("error parsing OCSP response for '%s': %s\n"),
url, gpg_strerror (err));
xfree (response);
xfree (free_this);
return err;
}
switch (response_status)
{
case KSBA_OCSP_RSPSTATUS_SUCCESS: t = "success"; break;
case KSBA_OCSP_RSPSTATUS_MALFORMED: t = "malformed"; break;
case KSBA_OCSP_RSPSTATUS_INTERNAL: t = "internal error"; break;
case KSBA_OCSP_RSPSTATUS_TRYLATER: t = "try later"; break;
case KSBA_OCSP_RSPSTATUS_SIGREQUIRED: t = "must sign request"; break;
case KSBA_OCSP_RSPSTATUS_UNAUTHORIZED: t = "unauthorized"; break;
case KSBA_OCSP_RSPSTATUS_REPLAYED: t = "replay detected"; break;
case KSBA_OCSP_RSPSTATUS_OTHER: t = "other (unknown)"; break;
case KSBA_OCSP_RSPSTATUS_NONE: t = "no status"; break;
default: t = "[unknown status]"; break;
}
if (response_status == KSBA_OCSP_RSPSTATUS_SUCCESS)
{
if (opt.verbose)
log_info (_("OCSP responder at '%s' status: %s\n"), url, t);
err = ksba_ocsp_hash_response (ocsp, response, responselen,
HASH_FNC, md);
if (err)
log_error (_("hashing the OCSP response for '%s' failed: %s\n"),
url, gpg_strerror (err));
}
else
{
log_error (_("OCSP responder at '%s' status: %s\n"), url, t);
err = gpg_error (GPG_ERR_GENERAL);
}
xfree (response);
xfree (free_this);
return err;
}
