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558 lines
14 KiB
558 lines
14 KiB
#include <stdio.h>
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#include <cups/ipp.h>
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#include <cups/http.h>
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#include <cups/cups.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#define CUPS_SERVERROOT "/etc/cups"
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static http_t *cups_server;
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static ipp_status_t last_error;
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static char authstring[HTTP_MAX_VALUE];
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static char pwdstring[33];
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static int cups_local_auth(http_t *http);
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const char* cupsGetConf( void );
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int cupsPutConf( const char* );
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const char * /* O - Filename for PPD file */
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cupsGetConf(void)
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{
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int fd; /* PPD file */
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int bytes; /* Number of bytes read */
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char buffer[8192]; /* Buffer for file */
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char resource[HTTP_MAX_URI]; /* Resource name */
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const char *password; /* Password string */
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char realm[HTTP_MAX_VALUE], /* realm="xyz" string */
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nonce[HTTP_MAX_VALUE], /* nonce="xyz" string */
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plain[255], /* Plaintext username:password */
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encode[512]; /* Encoded username:password */
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http_status_t status; /* HTTP status from server */
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char prompt[1024]; /* Prompt string */
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int digest_tries; /* Number of tries with Digest */
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static char filename[HTTP_MAX_URI]; /* Local filename */
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#if CUPS_VERSION_MAJOR < 1 || (CUPS_VERSION_MAJOR == 1 && CUPS_VERSION_MINOR < 2)
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const char *fqdn = 0;
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#else
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char fqdn[ HTTP_MAX_URI ]; /* Server name buffer */
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#endif
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/*
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* Connect to the correct server as needed...
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*/
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if ((cups_server = httpConnectEncrypt(cupsServer(), ippPort(),
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cupsEncryption())) == NULL)
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{
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last_error = IPP_SERVICE_UNAVAILABLE;
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return (NULL);
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}
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/*
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* Get a temp file...
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*/
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if ((fd = cupsTempFd(filename, sizeof(filename))) < 0)
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{
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/*
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* Can't open file; close the server connection and return NULL...
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*/
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httpFlush(cups_server);
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httpClose(cups_server);
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cups_server = NULL;
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return (NULL);
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}
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/*
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* And send a request to the HTTP server...
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*/
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snprintf(resource, sizeof(resource), "/admin/conf/cupsd.conf");
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digest_tries = 0;
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do
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{
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httpClearFields(cups_server);
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httpSetField(cups_server, HTTP_FIELD_HOST, cupsServer());
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httpSetField(cups_server, HTTP_FIELD_AUTHORIZATION, authstring);
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if (httpGet(cups_server, resource))
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{
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if (httpReconnect(cups_server))
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{
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status = HTTP_ERROR;
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break;
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}
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else
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{
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status = HTTP_UNAUTHORIZED;
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continue;
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}
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}
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while ((status = httpUpdate(cups_server)) == HTTP_CONTINUE);
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if (status == HTTP_UNAUTHORIZED)
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{
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const char *www_authenticate;
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fprintf(stderr,"cupsGetConf: unauthorized...\n");
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/*
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* Flush any error message...
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*/
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httpFlush(cups_server);
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/*
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* See if we can do local authentication...
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*/
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if (cups_local_auth(cups_server))
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continue;
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/*
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* See if we should retry the current digest password...
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*/
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#if CUPS_VERSION_MAJOR < 1 || (CUPS_VERSION_MAJOR == 1 && CUPS_VERSION_MINOR < 2)
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www_authenticate = cups_server->fields[HTTP_FIELD_WWW_AUTHENTICATE];
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#else
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www_authenticate = httpGetField( cups_server, HTTP_FIELD_WWW_AUTHENTICATE );
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#endif
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if (strncmp(www_authenticate, "Basic", 5) == 0 ||
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digest_tries > 1 || !pwdstring[0])
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{
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/*
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* Nope - get a password from the user...
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*/
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#if CUPS_VERSION_MAJOR < 1 || (CUPS_VERSION_MAJOR == 1 && CUPS_VERSION_MINOR < 2)
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fqdn = cups_server->hostname;
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#else
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httpGetHostname( cups_server, fqdn, sizeof( fqdn ) );
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#endif
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snprintf(prompt, sizeof(prompt), "Password for %s on %s? ", cupsUser(), fqdn );
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if ((password = cupsGetPassword(prompt)) == NULL)
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break;
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if (!password[0])
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break;
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strncpy(pwdstring, password, sizeof(pwdstring) - 1);
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pwdstring[sizeof(pwdstring) - 1] = '\0';
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digest_tries = 0;
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}
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else
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digest_tries ++;
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/*
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* Got a password; encode it for the server...
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*/
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#if CUPS_VERSION_MAJOR < 1 || (CUPS_VERSION_MAJOR == 1 && CUPS_VERSION_MINOR < 2)
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www_authenticate = cups_server->fields[HTTP_FIELD_WWW_AUTHENTICATE];
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#else
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www_authenticate = httpGetField( cups_server, HTTP_FIELD_WWW_AUTHENTICATE );
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#endif
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if (strncmp(www_authenticate, "Basic", 5) == 0)
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{
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/*
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* Basic authentication...
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*/
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snprintf(plain, sizeof(plain), "%s:%s", cupsUser(), pwdstring);
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#if CUPS_VERSION_MAJOR > 1 || (CUPS_VERSION_MAJOR == 1 && CUPS_VERSION_MINOR >= 2)
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httpEncode64_2(encode, sizeof(encode), plain, sizeof(plain));
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#else
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httpEncode64(encode, plain);
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#endif
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snprintf(authstring, sizeof(authstring), "Basic %s", encode);
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}
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else
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{
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/*
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* Digest authentication...
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*/
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httpGetSubField(cups_server, HTTP_FIELD_WWW_AUTHENTICATE, "realm", realm);
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httpGetSubField(cups_server, HTTP_FIELD_WWW_AUTHENTICATE, "nonce", nonce);
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httpMD5(cupsUser(), realm, pwdstring, encode);
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httpMD5Final(nonce, "GET", resource, encode);
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snprintf(authstring, sizeof(authstring),
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"Digest username=\"%s\", realm=\"%s\", nonce=\"%s\", "
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"response=\"%s\"", cupsUser(), realm, nonce, encode);
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}
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continue;
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}
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#ifdef HAVE_LIBSSL
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else if (status == HTTP_UPGRADE_REQUIRED)
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{
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/*
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* Flush any error message...
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*/
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httpFlush(cups_server);
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/*
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* Upgrade with encryption...
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*/
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httpEncryption(cups_server, HTTP_ENCRYPT_REQUIRED);
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/*
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* Try again, this time with encryption enabled...
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*/
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continue;
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}
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#endif /* HAVE_LIBSSL */
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}
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while (status == HTTP_UNAUTHORIZED || status == HTTP_UPGRADE_REQUIRED);
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/*
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* See if we actually got the file or an error...
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*/
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if (status != HTTP_OK)
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{
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close(fd);
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unlink(filename);
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httpFlush(cups_server);
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httpClose(cups_server);
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cups_server = NULL;
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return (NULL);
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}
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/*
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* OK, we need to copy the file...
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*/
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while ((bytes =
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#if CUPS_VERSION_MAJOR < 1 || (CUPS_VERSION_MAJOR == 1 && CUPS_VERSION_MINOR < 2)
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httpRead
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#else
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httpRead2
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#endif
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(cups_server, buffer, sizeof(buffer))) > 0)
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{
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write(fd, buffer, bytes);
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}
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close(fd);
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return (filename);
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}
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int /* O - Status of operation */
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cupsPutConf(const char *name) /* I - Name of the config file to send */
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{
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int fd; /* PPD file */
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int bytes; /* Number of bytes read */
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char buffer[8192]; /* Buffer for file */
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char resource[HTTP_MAX_URI]; /* Resource name */
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const char *password; /* Password string */
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char realm[HTTP_MAX_VALUE], /* realm="xyz" string */
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nonce[HTTP_MAX_VALUE], /* nonce="xyz" string */
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plain[255], /* Plaintext username:password */
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encode[512]; /* Encoded username:password */
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http_status_t status; /* HTTP status from server */
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char prompt[1024]; /* Prompt string */
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int digest_tries; /* Number of tries with Digest */
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#if CUPS_VERSION_MAJOR < 1 || (CUPS_VERSION_MAJOR == 1 && CUPS_VERSION_MINOR < 2)
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const char *fqdn = 0;
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#else
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char fqdn[ HTTP_MAX_URI ]; /* Server name buffer */
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#endif
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if (name == NULL)
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return 0;
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/*
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* Connect to the correct server as needed...
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*/
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if ((cups_server = httpConnectEncrypt(cupsServer(), ippPort(),
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cupsEncryption())) == NULL)
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{
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last_error = IPP_SERVICE_UNAVAILABLE;
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return 0;
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}
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/*
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* Open the local config file...
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*/
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if ((fd = open(name, O_RDONLY)) < 0)
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{
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/*
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* Can't open file; close the server connection and return NULL...
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*/
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httpFlush(cups_server);
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httpClose(cups_server);
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cups_server = NULL;
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return 0;
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}
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/*
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* And send a request to the HTTP server...
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*/
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strncpy(resource, "/admin/conf/cupsd.conf", sizeof(resource));
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digest_tries = 0;
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do
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{
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httpClearFields(cups_server);
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httpSetField(cups_server, HTTP_FIELD_HOST, cupsServer());
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httpSetField(cups_server, HTTP_FIELD_AUTHORIZATION, authstring);
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httpSetField(cups_server, HTTP_FIELD_TRANSFER_ENCODING, "chunked");
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if (httpPut(cups_server, resource))
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{
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if (httpReconnect(cups_server))
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{
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status = HTTP_ERROR;
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break;
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}
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else
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{
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status = HTTP_UNAUTHORIZED;
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continue;
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}
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}
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/* send the file now */
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lseek(fd, 0, SEEK_SET);
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status = HTTP_CONTINUE;
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while ((bytes = read(fd, buffer, sizeof(buffer))) > 0)
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if (httpCheck(cups_server))
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{
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if ((status = httpUpdate(cups_server)) != HTTP_CONTINUE)
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break;
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}
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else
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#if CUPS_VERSION_MAJOR < 1 || (CUPS_VERSION_MAJOR == 1 && CUPS_VERSION_MINOR < 2)
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httpWrite
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#else
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httpWrite2
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#endif
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(cups_server, buffer, bytes);
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if (status == HTTP_CONTINUE)
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{
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#if CUPS_VERSION_MAJOR < 1 || (CUPS_VERSION_MAJOR == 1 && CUPS_VERSION_MINOR < 2)
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httpWrite
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#else
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httpWrite2
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#endif
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(cups_server, buffer, 0);
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while ((status = httpUpdate(cups_server)) == HTTP_CONTINUE);
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}
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if (status == HTTP_UNAUTHORIZED)
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{
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const char *www_authenticate;
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fprintf(stderr,"cupsPutConf: unauthorized...");
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/*
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* Flush any error message...
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*/
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httpFlush(cups_server);
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/*
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* See if we can do local authentication...
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*/
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if (cups_local_auth(cups_server))
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continue;
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/*
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* See if we should retry the current digest password...
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*/
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#if CUPS_VERSION_MAJOR < 1 || (CUPS_VERSION_MAJOR == 1 && CUPS_VERSION_MINOR < 2)
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www_authenticate = cups_server->fields[HTTP_FIELD_WWW_AUTHENTICATE];
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#else
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www_authenticate = httpGetField( cups_server, HTTP_FIELD_WWW_AUTHENTICATE );
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#endif
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if (strncmp(www_authenticate, "Basic", 5) == 0 ||
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digest_tries > 1 || !pwdstring[0])
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{
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/*
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* Nope - get a password from the user...
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*/
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#if CUPS_VERSION_MAJOR < 1 || (CUPS_VERSION_MAJOR == 1 && CUPS_VERSION_MINOR < 2)
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fqdn = cups_server->hostname;
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#else
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httpGetHostname( cups_server, fqdn, sizeof( fqdn ) );
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#endif
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snprintf(prompt, sizeof(prompt), "Password for %s on %s? ", cupsUser(), fqdn );
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if ((password = cupsGetPassword(prompt)) == NULL)
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break;
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if (!password[0])
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break;
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strncpy(pwdstring, password, sizeof(pwdstring) - 1);
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pwdstring[sizeof(pwdstring) - 1] = '\0';
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digest_tries = 0;
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}
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else
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digest_tries ++;
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/*
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* Got a password; encode it for the server...
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*/
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#if CUPS_VERSION_MAJOR < 1 || (CUPS_VERSION_MAJOR == 1 && CUPS_VERSION_MINOR < 2)
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www_authenticate = cups_server->fields[HTTP_FIELD_WWW_AUTHENTICATE];
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#else
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www_authenticate = httpGetField( cups_server, HTTP_FIELD_WWW_AUTHENTICATE );
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#endif
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if (strncmp(www_authenticate, "Basic", 5) == 0)
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{
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/*
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* Basic authentication...
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*/
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snprintf(plain, sizeof(plain), "%s:%s", cupsUser(), pwdstring);
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#if CUPS_VERSION_MAJOR > 1 || (CUPS_VERSION_MAJOR == 1 && CUPS_VERSION_MINOR >= 2)
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httpEncode64_2(encode, sizeof(encode), plain, sizeof(plain));
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#else
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httpEncode64(encode, plain);
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#endif
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snprintf(authstring, sizeof(authstring), "Basic %s", encode);
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}
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else
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{
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/*
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* Digest authentication...
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*/
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httpGetSubField(cups_server, HTTP_FIELD_WWW_AUTHENTICATE, "realm", realm);
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httpGetSubField(cups_server, HTTP_FIELD_WWW_AUTHENTICATE, "nonce", nonce);
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httpMD5(cupsUser(), realm, pwdstring, encode);
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httpMD5Final(nonce, "GET", resource, encode);
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snprintf(authstring, sizeof(authstring),
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"Digest username=\"%s\", realm=\"%s\", nonce=\"%s\", "
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"response=\"%s\"", cupsUser(), realm, nonce, encode);
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}
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continue;
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}
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#ifdef HAVE_LIBSSL
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else if (status == HTTP_UPGRADE_REQUIRED)
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{
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/*
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* Flush any error message...
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*/
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httpFlush(cups_server);
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/*
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* Upgrade with encryption...
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*/
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httpEncryption(cups_server, HTTP_ENCRYPT_REQUIRED);
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/*
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* Try again, this time with encryption enabled...
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*/
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continue;
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}
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#endif /* HAVE_LIBSSL */
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}
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while (status == HTTP_UNAUTHORIZED || status == HTTP_UPGRADE_REQUIRED);
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/*
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* See if we actually got the file or an error...
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*/
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if (status != HTTP_CREATED)
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{
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httpFlush(cups_server);
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httpClose(cups_server);
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cups_server = NULL;
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close(fd);
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return 0;
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}
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close(fd);
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return 1;
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}
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static int /* O - 1 if available, 0 if not */
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cups_local_auth(http_t *http) /* I - Connection */
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{
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int pid; /* Current process ID */
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FILE *fp; /* Certificate file */
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char filename[1024], /* Certificate filename */
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certificate[33];/* Certificate string */
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const char *root; /* Server root directory */
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/*
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* See if we are accessing localhost...
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the struct has changed in newer versions - PiggZ (adam@piggz.co.uk)
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*/
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#if CUPS_VERSION_MAJOR > 1 || (CUPS_VERSION_MAJOR == 1 && CUPS_VERSION_MINOR >= 2)
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if (!httpAddrLocalhost(http))
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#else
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if (ntohl(*(int*)&http->hostaddr.sin_addr) != 0x7f000001 &&
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strcasecmp(http->hostname, "localhost") != 0)
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#endif
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return (0);
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/*
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* Try opening a certificate file for this PID. If that fails,
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* try the root certificate...
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*/
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if ((root = getenv("CUPS_SERVERROOT")) == NULL)
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root = CUPS_SERVERROOT;
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pid = getpid();
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snprintf(filename, sizeof(filename), "%s/certs/%d", root, pid);
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if ((fp = fopen(filename, "r")) == NULL && pid > 0)
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{
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snprintf(filename, sizeof(filename), "%s/certs/0", root);
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fp = fopen(filename, "r");
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}
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if (fp == NULL)
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return (0);
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/*
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* Read the certificate from the file...
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*/
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fgets(certificate, sizeof(certificate), fp);
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fclose(fp);
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/*
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* Set the authorization string and return...
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*/
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snprintf(authstring, sizeof(authstring), "Local %s", certificate);
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return (1);
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}
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