/*
* Authentication functions for CUPS.
*
- * Copyright 2007-2017 by Apple Inc.
+ * Copyright 2007-2019 by Apple Inc.
* Copyright 1997-2007 by Easy Software Products.
*
* This file contains Kerberos support code, copyright 2006 by
*/
#include "cups-private.h"
+#include "debug-internal.h"
#include <fcntl.h>
#include <sys/stat.h>
-#if defined(WIN32) || defined(__EMX__)
+#if defined(_WIN32) || defined(__EMX__)
# include <io.h>
#else
# include <unistd.h>
-#endif /* WIN32 || __EMX__ */
+#endif /* _WIN32 || __EMX__ */
#if HAVE_AUTHORIZATION_H
# include <Security/Authorization.h>
-# ifdef HAVE_SECBASEPRIV_H
-# include <Security/SecBasePriv.h>
-# else
-extern const char *cssmErrorString(int error);
-# endif /* HAVE_SECBASEPRIV_H */
#endif /* HAVE_AUTHORIZATION_H */
#if defined(SO_PEERCRED) && defined(AF_LOCAL)
static const char *cups_auth_scheme(const char *www_authenticate, char *scheme, size_t schemesize);
#ifdef HAVE_GSSAPI
+# define CUPS_GSS_OK 0 /* Successfully set credentials */
+# define CUPS_GSS_NONE -1 /* No credentials */
+# define CUPS_GSS_FAIL -2 /* Failed credentials/authentication */
# ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
# ifdef HAVE_GSS_GSSAPI_SPI_H
# include <GSS/gssapi_spi.h>
*www_auth, /* WWW-Authenticate header */
*schemedata; /* Scheme-specific data */
char scheme[256], /* Scheme name */
- prompt[1024], /* Prompt for user */
- realm[HTTP_MAX_VALUE], /* realm="xyz" string */
- nonce[HTTP_MAX_VALUE]; /* nonce="xyz" string */
+ prompt[1024]; /* Prompt for user */
int localauth; /* Local authentication result */
_cups_globals_t *cg; /* Global data */
* Check the scheme name...
*/
+ DEBUG_printf(("2cupsDoAuthentication: Trying scheme \"%s\"...", scheme));
+
#ifdef HAVE_GSSAPI
if (!_cups_strcasecmp(scheme, "Negotiate"))
{
* Kerberos authentication...
*/
- if (_cupsSetNegotiateAuthString(http, method, resource))
+ int gss_status; /* Auth status */
+
+ if ((gss_status = _cupsSetNegotiateAuthString(http, method, resource)) == CUPS_GSS_FAIL)
{
+ DEBUG_puts("1cupsDoAuthentication: Negotiate failed.");
http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
return (-1);
}
-
- break;
+ else if (gss_status == CUPS_GSS_NONE)
+ {
+ DEBUG_puts("2cupsDoAuthentication: No credentials for Negotiate.");
+ continue;
+ }
+ else
+ {
+ DEBUG_puts("2cupsDoAuthentication: Using Negotiate.");
+ break;
+ }
}
else
#endif /* HAVE_GSSAPI */
if (_cups_strcasecmp(scheme, "Basic") && _cups_strcasecmp(scheme, "Digest"))
- continue; /* Not supported (yet) */
+ {
+ /*
+ * Other schemes not yet supported...
+ */
+
+ DEBUG_printf(("2cupsDoAuthentication: Scheme \"%s\" not yet supported.", scheme));
+ continue;
+ }
/*
* See if we should retry the current username:password...
if (!cg->lang_default)
cg->lang_default = cupsLangDefault();
- if (cups_auth_param(scheme, "username", default_username, sizeof(default_username)))
+ if (cups_auth_param(schemedata, "username", default_username, sizeof(default_username)))
cupsSetUser(default_username);
snprintf(prompt, sizeof(prompt), _cupsLangString(cg->lang_default, _("Password for %s on %s? ")), cupsUser(), http->hostname[0] == '/' ? "localhost" : http->hostname);
if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
{
+ DEBUG_puts("1cupsDoAuthentication: User canceled password request.");
http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
return (-1);
}
char encode[256]; /* Base64 buffer */
+ DEBUG_puts("2cupsDoAuthentication: Using Basic.");
httpEncode64_2(encode, sizeof(encode), http->userpass, (int)strlen(http->userpass));
httpSetAuthString(http, "Basic", encode);
+ break;
}
else if (!_cups_strcasecmp(scheme, "Digest"))
{
* Digest authentication...
*/
- int i; /* Looping var */
- char algorithm[65], /* Hashing algorithm */
- opaque[HTTP_MAX_VALUE],
- /* Opaque data from server */
- cnonce[65], /* cnonce value */
- kd[65], /* Final MD5/SHA-256 digest */
- ha1[65], /* Hash of username:realm:password */
- ha2[65], /* Hash of method:request-uri */
- hdata[65], /* Hash of auth data */
- temp[1024], /* Temporary string */
- digest[1024]; /* Digest auth data */
- unsigned char hash[32]; /* Hash buffer */
- const char *hashalg; /* Hashing algorithm */
- size_t hashsize; /* Size of hash */
-
- if (strcmp(nonce, http->nonce))
- {
- strlcpy(http->nonce, nonce, sizeof(http->nonce));
- http->nonce_count = 1;
- }
- else
- http->nonce_count ++;
+ char nonce[HTTP_MAX_VALUE]; /* nonce="xyz" string */
- cups_auth_param(schemedata, "opaque", opaque, sizeof(opaque));
+ cups_auth_param(schemedata, "algorithm", http->algorithm, sizeof(http->algorithm));
+ cups_auth_param(schemedata, "opaque", http->opaque, sizeof(http->opaque));
cups_auth_param(schemedata, "nonce", nonce, sizeof(nonce));
- cups_auth_param(schemedata, "realm", realm, sizeof(realm));
-
- for (i = 0; i < 64; i ++)
- cnonce[i] = "0123456789ABCDEF"[CUPS_RAND() & 15];
- cnonce[64] = '\0';
+ cups_auth_param(schemedata, "realm", http->realm, sizeof(http->realm));
- if (cups_auth_param(schemedata, "algorithm", algorithm, sizeof(algorithm)))
+ if (_httpSetDigestAuthString(http, nonce, method, resource))
{
- /*
- * Follow RFC 2617/7616...
- */
-
- if (!_cups_strcasecmp(algorithm, "MD5"))
- {
- /*
- * RFC 2617 Digest with MD5
- */
-
- hashalg = "md5";
- }
- else if (!_cups_strcasecmp(algorithm, "SHA-256"))
- {
- /*
- * RFC 7616 Digest with SHA-256
- */
-
- hashalg = "sha2-256";
- }
- else
- {
- /*
- * Some other algorithm we don't support, skip this one...
- */
-
- continue;
- }
-
- /*
- * Calculate digest value...
- */
-
- /* H(A1) = H(username:realm:password) */
- snprintf(temp, sizeof(temp), "%s:%s:%s", cupsUser(), realm, strchr(http->userpass, ':') + 1);
- hashsize = (size_t)cupsHashData(hashalg, (unsigned char *)temp, strlen(temp), hash, sizeof(hash));
- cupsHashString(hash, hashsize, ha1, sizeof(ha1));
-
- /* H(A2) = H(method:uri) */
- snprintf(temp, sizeof(temp), "%s:%s", method, resource);
- hashsize = (size_t)cupsHashData(hashalg, (unsigned char *)temp, strlen(temp), hash, sizeof(hash));
- cupsHashString(hash, hashsize, ha2, sizeof(ha2));
-
- /* H(data) = H(nonce:nc:cnonce:qop:H(A2)) */
- snprintf(temp, sizeof(temp), "%s:%08x:%s:auth:%s", nonce, http->nonce_count, cnonce, ha2);
- hashsize = (size_t)cupsHashData(hashalg, (unsigned char *)temp, strlen(temp), hash, sizeof(hash));
- cupsHashString(hash, hashsize, hdata, sizeof(hdata));
-
- /* KD = H(H(A1):H(data)) */
- snprintf(temp, sizeof(temp), "%s:%s", ha1, hdata);
- hashsize = (size_t)cupsHashData(hashalg, (unsigned char *)temp, strlen(temp), hash, sizeof(hash));
- cupsHashString(hash, hashsize, kd, sizeof(kd));
-
- /* Pass the RFC 2617/7616 WWW-Authenticate header */
- if (opaque[0])
- snprintf(digest, sizeof(digest), "username=\"%s\", realm=\"%s\", nonce=\"%s\", algorithm=%s, qop=auth, opaque=\"%s\", cnonce=\"%s\", nc=%08x, uri=\"%s\", response=\"%s\"", cupsUser(), realm, nonce, algorithm, opaque, cnonce, http->nonce_count, resource, kd);
- else
- snprintf(digest, sizeof(digest), "username=\"%s\", realm=\"%s\", nonce=\"%s\", algorithm=%s, qop=auth, cnonce=\"%s\", nc=%08x, uri=\"%s\", response=\"%s\"", cupsUser(), realm, nonce, algorithm, cnonce, http->nonce_count, resource, kd);
+ DEBUG_puts("2cupsDoAuthentication: Using Digest.");
+ break;
}
- else
- {
- /*
- * Use old RFC 2069 Digest method...
- */
-
- /* H(A1) = H(username:realm:password) */
- snprintf(temp, sizeof(temp), "%s:%s:%s", cupsUser(), realm, strchr(http->userpass, ':') + 1);
- hashsize = (size_t)cupsHashData("md5", (unsigned char *)temp, strlen(temp), hash, sizeof(hash));
- cupsHashString(hash, hashsize, ha1, sizeof(ha1));
-
- /* H(A2) = H(method:uri) */
- snprintf(temp, sizeof(temp), "%s:%s", method, resource);
- hashsize = (size_t)cupsHashData("md5", (unsigned char *)temp, strlen(temp), hash, sizeof(hash));
- cupsHashString(hash, hashsize, ha2, sizeof(ha2));
-
- /* KD = H(H(A1):nonce:H(A2)) */
- snprintf(temp, sizeof(temp), "%s:%s:%s", ha1, nonce, ha2);
- hashsize = (size_t)cupsHashData("md5", (unsigned char *)temp, strlen(temp), hash, sizeof(hash));
- cupsHashString(hash, hashsize, kd, sizeof(kd));
-
- /* Pass the RFC 2069 WWW-Authenticate header */
- snprintf(digest, sizeof(digest), "username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"", cupsUser(), realm, nonce, resource, kd);
- }
-
- httpSetAuthString(http, "Digest", digest);
}
}
if (http->authstring)
{
- DEBUG_printf(("1cupsDoAuthentication: authstring=\"%s\"", http->authstring));
+ DEBUG_printf(("1cupsDoAuthentication: authstring=\"%s\".", http->authstring));
return (0);
}
else
{
- DEBUG_printf(("1cupsDoAuthentication: Unknown auth type: \"%s\"", www_auth));
+ DEBUG_puts("1cupsDoAuthentication: No supported schemes.");
http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
return (-1);
* '_cupsSetNegotiateAuthString()' - Set the Kerberos authentication string.
*/
-int /* O - 0 on success, -1 on error */
+int /* O - 0 on success, negative on error */
_cupsSetNegotiateAuthString(
http_t *http, /* I - Connection to server */
const char *method, /* I - Request method ("GET", "POST", "PUT") */
{
DEBUG_puts("1_cupsSetNegotiateAuthString: Weak-linked GSSAPI/Kerberos "
"framework is not present");
- return (-1);
+ return (CUPS_GSS_NONE);
}
# endif /* __APPLE__ */
+ if (!strcmp(http->hostname, "localhost") || http->hostname[0] == '/' || isdigit(http->hostname[0] & 255) || !strchr(http->hostname, '.'))
+ {
+ DEBUG_printf(("1_cupsSetNegotiateAuthString: Kerberos not available for host \"%s\".", http->hostname));
+ return (CUPS_GSS_NONE);
+ }
+
if (http->gssname == GSS_C_NO_NAME)
{
http->gssname = cups_gss_getname(http, _cupsGSSServiceName());
GSS_C_NO_BUFFER, &http->gssmech,
&output_token, NULL, NULL);
-#ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
+# ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
if (major_status == GSS_S_NO_CRED)
{
/*
cupsUser(), http->gsshost);
if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
- return (-1);
+ return (CUPS_GSS_FAIL);
/*
* Try to acquire credentials...
}
}
}
-#endif /* HAVE_GSS_ACQUIRED_CRED_EX_F */
+# endif /* HAVE_GSS_ACQUIRED_CRED_EX_F */
- if (GSS_ERROR(major_status))
+ if (major_status == GSS_S_NO_CRED)
{
- cups_gss_printf(major_status, minor_status,
- "_cupsSetNegotiateAuthString: Unable to initialize "
- "security context");
- return (-1);
+ cups_gss_printf(major_status, minor_status, "_cupsSetNegotiateAuthString: No credentials");
+ return (CUPS_GSS_NONE);
+ }
+ else if (GSS_ERROR(major_status))
+ {
+ cups_gss_printf(major_status, minor_status, "_cupsSetNegotiateAuthString: Unable to initialize security context");
+ return (CUPS_GSS_FAIL);
}
-#ifdef DEBUG
+# ifdef DEBUG
else if (major_status == GSS_S_CONTINUE_NEEDED)
- cups_gss_printf(major_status, minor_status,
- "_cupsSetNegotiateAuthString: Continuation needed!");
-#endif /* DEBUG */
+ cups_gss_printf(major_status, minor_status, "_cupsSetNegotiateAuthString: Continuation needed");
+# endif /* DEBUG */
if (output_token.length > 0 && output_token.length <= 65536)
{
*/
int authsize = 10 + /* "Negotiate " */
- (int)output_token.length * 4 / 3 + 1 + 1;
+ (((int)output_token.length * 4 / 3 + 3) & ~3) + 1;
/* Base64 + nul */
httpSetAuthString(http, NULL, NULL);
"large - %d bytes!", (int)output_token.length));
gss_release_buffer(&minor_status, &output_token);
- return (-1);
+ return (CUPS_GSS_FAIL);
}
- return (0);
+ return (CUPS_GSS_OK);
}
+#endif /* HAVE_GSSAPI */
/*
size_t schemelen = strlen(scheme); /* Length of scheme */
+ DEBUG_printf(("8cups_auth_find(www_authenticate=\"%s\", scheme=\"%s\"(%d))", www_authenticate, scheme, (int)schemelen));
+
while (*www_authenticate)
{
/*
* Skip leading whitespace and commas...
*/
+ DEBUG_printf(("9cups_auth_find: Before whitespace: \"%s\"", www_authenticate));
while (isspace(*www_authenticate & 255) || *www_authenticate == ',')
www_authenticate ++;
+ DEBUG_printf(("9cups_auth_find: After whitespace: \"%s\"", www_authenticate));
/*
* See if this is "Scheme" followed by whitespace or the end of the string.
*/
- if (!strncmp(www_authenticate, scheme, schemelen) && (isspace(www_authenticate[schemelen] & 255) || !www_authenticate[schemelen]))
+ if (!strncmp(www_authenticate, scheme, schemelen) && (isspace(www_authenticate[schemelen] & 255) || www_authenticate[schemelen] == ',' || !www_authenticate[schemelen]))
{
/*
* Yes, this is the start of the scheme-specific information...
*/
+ DEBUG_printf(("9cups_auth_find: Returning \"%s\".", www_authenticate));
+
return (www_authenticate);
}
* Skip quoted value...
*/
- while (www_authenticate[1] && www_authenticate[1] != '\"')
+ www_authenticate ++;
+ while (*www_authenticate && *www_authenticate != '\"')
www_authenticate ++;
+
+ DEBUG_printf(("9cups_auth_find: After quoted: \"%s\"", www_authenticate));
}
www_authenticate ++;
}
+
+ DEBUG_printf(("9cups_auth_find: After skip: \"%s\"", www_authenticate));
}
+ DEBUG_puts("9cups_auth_find: Returning NULL.");
+
return (NULL);
}
int param; /* Is this a parameter? */
+ DEBUG_printf(("8cups_auth_param(scheme=\"%s\", name=\"%s\", value=%p, valsize=%d)", scheme, name, (void *)value, (int)valsize));
+
while (!isspace(*scheme & 255) && *scheme)
scheme ++;
*valptr = '\0';
+ DEBUG_printf(("9cups_auth_param: Returning \"%s\".", value));
+
return (value);
}
* Skip quoted value...
*/
- while (scheme[1] && scheme[1] != '\"')
+ scheme ++;
+ while (*scheme && *scheme != '\"')
scheme ++;
}
*value = '\0';
+ DEBUG_puts("9cups_auth_param: Returning NULL.");
+
return (NULL);
}
int param; /* Is this a parameter? */
+ DEBUG_printf(("8cups_auth_scheme(www_authenticate=\"%s\", scheme=%p, schemesize=%d)", www_authenticate, (void *)scheme, (int)schemesize));
+
while (*www_authenticate)
{
/*
* Parse the scheme name or param="value" string...
*/
- for (sptr = scheme, start = www_authenticate, param = 0; *www_authenticate && !isspace(*www_authenticate & 255); www_authenticate ++)
+ for (sptr = scheme, start = www_authenticate, param = 0; *www_authenticate && *www_authenticate != ',' && !isspace(*www_authenticate & 255); www_authenticate ++)
{
if (*www_authenticate == '=')
param = 1;
* Skip quoted value...
*/
- while (www_authenticate[1] && www_authenticate[1] != '\"')
+ www_authenticate ++;
+ while (*www_authenticate && *www_authenticate != '\"')
www_authenticate ++;
}
}
if (sptr > scheme && !param)
{
*sptr = '\0';
+
+ DEBUG_printf(("9cups_auth_scheme: Returning \"%s\".", start));
+
return (start);
}
}
*scheme = '\0';
+ DEBUG_puts("9cups_auth_scheme: Returning NULL.");
+
return (NULL);
}
+#ifdef HAVE_GSSAPI
# ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
/*
* 'cups_gss_acquire()' - Kerberos credentials callback.
/* -1 error */
cups_local_auth(http_t *http) /* I - HTTP connection to server */
{
-#if defined(WIN32) || defined(__EMX__)
+#if defined(_WIN32) || defined(__EMX__)
/*
- * Currently WIN32 and OS-2 do not support the CUPS server...
+ * Currently _WIN32 and OS-2 do not support the CUPS server...
*/
return (1);
return (1);
}
+ www_auth = httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE);
+
# if defined(HAVE_AUTHORIZATION_H)
/*
* Delete any previous authorization reference...
http->auth_ref = NULL;
}
- www_auth = httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE);
-
- if (!getenv("GATEWAY_INTERFACE") && (schemedata = cups_auth_find(www_auth, "AuthKey")) != NULL && cups_auth_param(schemedata, "key", auth_key, sizeof(auth_key)))
+ if (!getenv("GATEWAY_INTERFACE") && (schemedata = cups_auth_find(www_auth, "AuthRef")) != NULL && cups_auth_param(schemedata, "key", auth_key, sizeof(auth_key)))
{
status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment, kAuthorizationFlagDefaults, &http->auth_ref);
if (status != errAuthorizationSuccess)
{
- DEBUG_printf(("8cups_local_auth: AuthorizationCreate() returned %d (%s)",
- (int)status, cssmErrorString(status)));
+ DEBUG_printf(("8cups_local_auth: AuthorizationCreate() returned %d",
+ (int)status));
return (-1);
}
else if (status == errAuthorizationCanceled)
return (-1);
- DEBUG_printf(("9cups_local_auth: AuthorizationCopyRights() returned %d (%s)",
- (int)status, cssmErrorString(status)));
+ DEBUG_printf(("9cups_local_auth: AuthorizationCopyRights() returned %d", (int)status));
/*
* Fall through to try certificates...
if (cups_auth_find(www_auth, "Negotiate"))
return (1);
# endif /* HAVE_GSSAPI */
-# ifdef HAVE_AUTHORIZATION_H
- if (cups_auth_find(www_auth, "AuthKey"))
- return (1);
-# endif /* HAVE_AUTHORIZATION_H */
# if defined(SO_PEERCRED) && defined(AF_LOCAL)
/*
* No certificate for this PID; see if we can get the root certificate...
*/
- DEBUG_printf(("9cups_local_auth: Unable to open file %s: %s", filename, strerror(errno)));
+ DEBUG_printf(("9cups_local_auth: Unable to open file \"%s\": %s", filename, strerror(errno)));
if (!cups_auth_param(schemedata, "trc", trc, sizeof(trc)))
{
}
snprintf(filename, sizeof(filename), "%s/certs/0", cg->cups_statedir);
- fp = fopen(filename, "r");
+ if ((fp = fopen(filename, "r")) == NULL)
+ DEBUG_printf(("9cups_local_auth: Unable to open file \"%s\": %s", filename, strerror(errno)));
}
if (fp)
}
return (1);
-#endif /* WIN32 || __EMX__ */
+#endif /* _WIN32 || __EMX__ */
}
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