diff --git a/lib/libfetch/common.c b/lib/libfetch/common.c index 94ebfa21edae..5cc7e263b0c5 100644 --- a/lib/libfetch/common.c +++ b/lib/libfetch/common.c @@ -1,1374 +1,1374 @@ /*- - * Copyright (c) 1998-2011 Dag-Erling Smørgrav + * Copyright (c) 1998-2014 Dag-Erling Smørgrav * Copyright (c) 2013 Michael Gmelin * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer * in this position and unchanged. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef WITH_SSL #include #endif #include "fetch.h" #include "common.h" /*** Local data **************************************************************/ /* * Error messages for resolver errors */ static struct fetcherr netdb_errlist[] = { #ifdef EAI_NODATA { EAI_NODATA, FETCH_RESOLV, "Host not found" }, #endif { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" }, { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" }, { EAI_NONAME, FETCH_RESOLV, "No address record" }, { -1, FETCH_UNKNOWN, "Unknown resolver error" } }; /* End-of-Line */ static const char ENDL[2] = "\r\n"; /*** Error-reporting functions ***********************************************/ /* * Map error code to string */ static struct fetcherr * fetch_finderr(struct fetcherr *p, int e) { while (p->num != -1 && p->num != e) p++; return (p); } /* * Set error code */ void fetch_seterr(struct fetcherr *p, int e) { p = fetch_finderr(p, e); fetchLastErrCode = p->cat; snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string); } /* * Set error code according to errno */ void fetch_syserr(void) { switch (errno) { case 0: fetchLastErrCode = FETCH_OK; break; case EPERM: case EACCES: case EROFS: case EAUTH: case ENEEDAUTH: fetchLastErrCode = FETCH_AUTH; break; case ENOENT: case EISDIR: /* XXX */ fetchLastErrCode = FETCH_UNAVAIL; break; case ENOMEM: fetchLastErrCode = FETCH_MEMORY; break; case EBUSY: case EAGAIN: fetchLastErrCode = FETCH_TEMP; break; case EEXIST: fetchLastErrCode = FETCH_EXISTS; break; case ENOSPC: fetchLastErrCode = FETCH_FULL; break; case EADDRINUSE: case EADDRNOTAVAIL: case ENETDOWN: case ENETUNREACH: case ENETRESET: case EHOSTUNREACH: fetchLastErrCode = FETCH_NETWORK; break; case ECONNABORTED: case ECONNRESET: fetchLastErrCode = FETCH_ABORT; break; case ETIMEDOUT: fetchLastErrCode = FETCH_TIMEOUT; break; case ECONNREFUSED: case EHOSTDOWN: fetchLastErrCode = FETCH_DOWN; break; default: fetchLastErrCode = FETCH_UNKNOWN; } snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno)); } /* * Emit status message */ void fetch_info(const char *fmt, ...) { va_list ap; va_start(ap, fmt); vfprintf(stderr, fmt, ap); va_end(ap); fputc('\n', stderr); } /*** Network-related utility functions ***************************************/ /* * Return the default port for a scheme */ int fetch_default_port(const char *scheme) { struct servent *se; if ((se = getservbyname(scheme, "tcp")) != NULL) return (ntohs(se->s_port)); if (strcasecmp(scheme, SCHEME_FTP) == 0) return (FTP_DEFAULT_PORT); if (strcasecmp(scheme, SCHEME_HTTP) == 0) return (HTTP_DEFAULT_PORT); return (0); } /* * Return the default proxy port for a scheme */ int fetch_default_proxy_port(const char *scheme) { if (strcasecmp(scheme, SCHEME_FTP) == 0) return (FTP_DEFAULT_PROXY_PORT); if (strcasecmp(scheme, SCHEME_HTTP) == 0) return (HTTP_DEFAULT_PROXY_PORT); return (0); } /* * Create a connection for an existing descriptor. */ conn_t * fetch_reopen(int sd) { conn_t *conn; int opt = 1; /* allocate and fill connection structure */ if ((conn = calloc(1, sizeof(*conn))) == NULL) return (NULL); fcntl(sd, F_SETFD, FD_CLOEXEC); setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof opt); conn->sd = sd; ++conn->ref; return (conn); } /* * Bump a connection's reference count. */ conn_t * fetch_ref(conn_t *conn) { ++conn->ref; return (conn); } /* * Bind a socket to a specific local address */ int fetch_bind(int sd, int af, const char *addr) { struct addrinfo hints, *res, *res0; int err; memset(&hints, 0, sizeof(hints)); hints.ai_family = af; hints.ai_socktype = SOCK_STREAM; hints.ai_protocol = 0; if ((err = getaddrinfo(addr, NULL, &hints, &res0)) != 0) return (-1); for (res = res0; res; res = res->ai_next) if (bind(sd, res->ai_addr, res->ai_addrlen) == 0) return (0); return (-1); } /* * Establish a TCP connection to the specified port on the specified host. */ conn_t * fetch_connect(const char *host, int port, int af, int verbose) { conn_t *conn; char pbuf[10]; const char *bindaddr; struct addrinfo hints, *res, *res0; int sd, err; DEBUG(fprintf(stderr, "---> %s:%d\n", host, port)); if (verbose) fetch_info("looking up %s", host); /* look up host name and set up socket address structure */ snprintf(pbuf, sizeof(pbuf), "%d", port); memset(&hints, 0, sizeof(hints)); hints.ai_family = af; hints.ai_socktype = SOCK_STREAM; hints.ai_protocol = 0; if ((err = getaddrinfo(host, pbuf, &hints, &res0)) != 0) { netdb_seterr(err); return (NULL); } bindaddr = getenv("FETCH_BIND_ADDRESS"); if (verbose) fetch_info("connecting to %s:%d", host, port); /* try to connect */ for (sd = -1, res = res0; res; sd = -1, res = res->ai_next) { if ((sd = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) == -1) continue; if (bindaddr != NULL && *bindaddr != '\0' && fetch_bind(sd, res->ai_family, bindaddr) != 0) { fetch_info("failed to bind to '%s'", bindaddr); close(sd); continue; } if (connect(sd, res->ai_addr, res->ai_addrlen) == 0 && fcntl(sd, F_SETFL, O_NONBLOCK) == 0) break; close(sd); } freeaddrinfo(res0); if (sd == -1) { fetch_syserr(); return (NULL); } if ((conn = fetch_reopen(sd)) == NULL) { fetch_syserr(); close(sd); } return (conn); } #ifdef WITH_SSL /* * Convert characters A-Z to lowercase (intentionally avoid any locale * specific conversions). */ static char fetch_ssl_tolower(char in) { if (in >= 'A' && in <= 'Z') return (in + 32); else return (in); } /* * isalpha implementation that intentionally avoids any locale specific * conversions. */ static int fetch_ssl_isalpha(char in) { return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z')); } /* * Check if passed hostnames a and b are equal. */ static int fetch_ssl_hname_equal(const char *a, size_t alen, const char *b, size_t blen) { size_t i; if (alen != blen) return (0); for (i = 0; i < alen; ++i) { if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i])) return (0); } return (1); } /* * Check if domain label is traditional, meaning that only A-Z, a-z, 0-9 * and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha- * numeric characters. Double hyphens (like they're found in IDN a-labels * 'xn--') are not allowed. Empty labels are invalid. */ static int fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok) { size_t i; if (!len || l[0] == '-' || l[len-1] == '-') return (0); for (i = 0; i < len; ++i) { if (!isdigit(l[i]) && !fetch_ssl_isalpha(l[i]) && !(l[i] == '*' && wcok) && !(l[i] == '-' && l[i - 1] != '-')) return (0); } return (1); } /* * Check if host name consists only of numbers. This might indicate an IP * address, which is not a good idea for CN wildcard comparison. */ static int fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len) { size_t i; for (i = 0; i < len; ++i) { if (!((hostname[i] >= '0' && hostname[i] <= '9') || hostname[i] == '.')) return (0); } return (1); } /* * Check if the host name h passed matches the pattern passed in m which * is usually part of subjectAltName or CN of a certificate presented to * the client. This includes wildcard matching. The algorithm is based on * RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280. */ static int fetch_ssl_hname_match(const char *h, size_t hlen, const char *m, size_t mlen) { int delta, hdotidx, mdot1idx, wcidx; const char *hdot, *mdot1, *mdot2; const char *wc; /* wildcard */ if (!(h && *h && m && *m)) return (0); if ((wc = strnstr(m, "*", mlen)) == NULL) return (fetch_ssl_hname_equal(h, hlen, m, mlen)); wcidx = wc - m; /* hostname should not be just dots and numbers */ if (fetch_ssl_hname_is_only_numbers(h, hlen)) return (0); /* only one wildcard allowed in pattern */ if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL) return (0); /* * there must be at least two more domain labels and * wildcard has to be in the leftmost label (RFC6125) */ mdot1 = strnstr(m, ".", mlen); if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4) return (0); mdot1idx = mdot1 - m; mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1); if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2) return (0); /* hostname must contain a dot and not be the 1st char */ hdot = strnstr(h, ".", hlen); if (hdot == NULL || hdot == h) return (0); hdotidx = hdot - h; /* * host part of hostname must be at least as long as * pattern it's supposed to match */ if (hdotidx < mdot1idx) return (0); /* * don't allow wildcards in non-traditional domain names * (IDN, A-label, U-label...) */ if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) || !fetch_ssl_is_trad_domain_label(m, mdot1idx, 1)) return (0); /* match domain part (part after first dot) */ if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1, mlen - mdot1idx)) return (0); /* match part left of wildcard */ if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx)) return (0); /* match part right of wildcard */ delta = mdot1idx - wcidx - 1; if (!fetch_ssl_hname_equal(hdot - delta, delta, mdot1 - delta, delta)) return (0); /* all tests succeded, it's a match */ return (1); } /* * Get numeric host address info - returns NULL if host was not an IP * address. The caller is responsible for deallocation using * freeaddrinfo(3). */ static struct addrinfo * fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len) { struct addrinfo hints, *res; char *host; host = (char *)malloc(len + 1); memcpy(host, hostname, len); host[len] = '\0'; memset(&hints, 0, sizeof(hints)); hints.ai_family = PF_UNSPEC; hints.ai_socktype = SOCK_STREAM; hints.ai_protocol = 0; hints.ai_flags = AI_NUMERICHOST; /* port is not relevant for this purpose */ getaddrinfo(host, "443", &hints, &res); free(host); return res; } /* * Compare ip address in addrinfo with address passes. */ static int fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost, size_t rhostlen) { const void *left; if (lhost->ai_family == AF_INET && rhostlen == 4) { left = (void *)&((struct sockaddr_in*)(void *) lhost->ai_addr)->sin_addr.s_addr; #ifdef INET6 } else if (lhost->ai_family == AF_INET6 && rhostlen == 16) { left = (void *)&((struct sockaddr_in6 *)(void *) lhost->ai_addr)->sin6_addr; #endif } else return (0); return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0); } /* * Compare ip address in addrinfo with host passed. If host is not an IP * address, comparison will fail. */ static int fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r, size_t rlen) { struct addrinfo *raddr; int ret; char *rip; ret = 0; if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL) return 0; /* not a numeric host */ if (laddr->ai_family == raddr->ai_family) { if (laddr->ai_family == AF_INET) { rip = (char *)&((struct sockaddr_in *)(void *) raddr->ai_addr)->sin_addr.s_addr; ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4); #ifdef INET6 } else if (laddr->ai_family == AF_INET6) { rip = (char *)&((struct sockaddr_in6 *)(void *) raddr->ai_addr)->sin6_addr; ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16); #endif } } freeaddrinfo(raddr); return (ret); } /* * Verify server certificate by subjectAltName. */ static int fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames, const char *host, struct addrinfo *ip) { const GENERAL_NAME *name; size_t nslen; int i; const char *ns; for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) { #if OPENSSL_VERSION_NUMBER < 0x10000000L /* * This is a workaround, since the following line causes * alignment issues in clang: * name = sk_GENERAL_NAME_value(altnames, i); * OpenSSL explicitly warns not to use those macros * directly, but there isn't much choice (and there * shouldn't be any ill side effects) */ name = (GENERAL_NAME *)SKM_sk_value(void, altnames, i); #else name = sk_GENERAL_NAME_value(altnames, i); #endif ns = (const char *)ASN1_STRING_data(name->d.ia5); nslen = (size_t)ASN1_STRING_length(name->d.ia5); if (name->type == GEN_DNS && ip == NULL && fetch_ssl_hname_match(host, strlen(host), ns, nslen)) return (1); else if (name->type == GEN_IPADD && ip != NULL && fetch_ssl_ipaddr_match_bin(ip, ns, nslen)) return (1); } return (0); } /* * Verify server certificate by CN. */ static int fetch_ssl_verify_cn(X509_NAME *subject, const char *host, struct addrinfo *ip) { ASN1_STRING *namedata; X509_NAME_ENTRY *nameentry; int cnlen, lastpos, loc, ret; unsigned char *cn; ret = 0; lastpos = -1; loc = -1; cn = NULL; /* get most specific CN (last entry in list) and compare */ while ((lastpos = X509_NAME_get_index_by_NID(subject, NID_commonName, lastpos)) != -1) loc = lastpos; if (loc > -1) { nameentry = X509_NAME_get_entry(subject, loc); namedata = X509_NAME_ENTRY_get_data(nameentry); cnlen = ASN1_STRING_to_UTF8(&cn, namedata); if (ip == NULL && fetch_ssl_hname_match(host, strlen(host), cn, cnlen)) ret = 1; else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen)) ret = 1; OPENSSL_free(cn); } return (ret); } /* * Verify that server certificate subjectAltName/CN matches * hostname. First check, if there are alternative subject names. If yes, * those have to match. Only if those don't exist it falls back to * checking the subject's CN. */ static int fetch_ssl_verify_hname(X509 *cert, const char *host) { struct addrinfo *ip; STACK_OF(GENERAL_NAME) *altnames; X509_NAME *subject; int ret; ret = 0; ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host)); altnames = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL); if (altnames != NULL) { ret = fetch_ssl_verify_altname(altnames, host, ip); } else { subject = X509_get_subject_name(cert); if (subject != NULL) ret = fetch_ssl_verify_cn(subject, host, ip); } if (ip != NULL) freeaddrinfo(ip); if (altnames != NULL) GENERAL_NAMES_free(altnames); return (ret); } /* * Configure transport security layer based on environment. */ static void fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose) { long ssl_ctx_options; ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_TICKET; if (getenv("SSL_ALLOW_SSL2") == NULL) ssl_ctx_options |= SSL_OP_NO_SSLv2; if (getenv("SSL_NO_SSL3") != NULL) ssl_ctx_options |= SSL_OP_NO_SSLv3; if (getenv("SSL_NO_TLS1") != NULL) ssl_ctx_options |= SSL_OP_NO_TLSv1; if (verbose) fetch_info("SSL options: %lx", ssl_ctx_options); SSL_CTX_set_options(ctx, ssl_ctx_options); } /* * Configure peer verification based on environment. */ static int fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose) { X509_LOOKUP *crl_lookup; X509_STORE *crl_store; const char *ca_cert_file, *ca_cert_path, *crl_file; if (getenv("SSL_NO_VERIFY_PEER") == NULL) { ca_cert_file = getenv("SSL_CA_CERT_FILE") != NULL ? getenv("SSL_CA_CERT_FILE") : "/etc/ssl/cert.pem"; ca_cert_path = getenv("SSL_CA_CERT_PATH"); if (verbose) { fetch_info("Peer verification enabled"); if (ca_cert_file != NULL) fetch_info("Using CA cert file: %s", ca_cert_file); if (ca_cert_path != NULL) fetch_info("Using CA cert path: %s", ca_cert_path); } SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, fetch_ssl_cb_verify_crt); SSL_CTX_load_verify_locations(ctx, ca_cert_file, ca_cert_path); if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) { if (verbose) fetch_info("Using CRL file: %s", crl_file); crl_store = SSL_CTX_get_cert_store(ctx); crl_lookup = X509_STORE_add_lookup(crl_store, X509_LOOKUP_file()); if (crl_lookup == NULL || !X509_load_crl_file(crl_lookup, crl_file, X509_FILETYPE_PEM)) { fprintf(stderr, "Could not load CRL file %s\n", crl_file); return (0); } X509_STORE_set_flags(crl_store, X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL); } } return (1); } /* * Configure client certificate based on environment. */ static int fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose) { const char *client_cert_file, *client_key_file; if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) { client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ? getenv("SSL_CLIENT_KEY_FILE") : client_cert_file; if (verbose) { fetch_info("Using client cert file: %s", client_cert_file); fetch_info("Using client key file: %s", client_key_file); } if (SSL_CTX_use_certificate_chain_file(ctx, client_cert_file) != 1) { fprintf(stderr, "Could not load client certificate %s\n", client_cert_file); return (0); } if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file, SSL_FILETYPE_PEM) != 1) { fprintf(stderr, "Could not load client key %s\n", client_key_file); return (0); } } return (1); } /* * Callback for SSL certificate verification, this is called on server * cert verification. It takes no decision, but informs the user in case * verification failed. */ int fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx) { X509 *crt; X509_NAME *name; char *str; str = NULL; if (!verified) { if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL && (name = X509_get_subject_name(crt)) != NULL) str = X509_NAME_oneline(name, 0, 0); fprintf(stderr, "Certificate verification failed for %s\n", str != NULL ? str : "no relevant certificate"); OPENSSL_free(str); } return (verified); } #endif /* * Enable SSL on a connection. */ int fetch_ssl(conn_t *conn, const struct url *URL, int verbose) { #ifdef WITH_SSL int ret, ssl_err; X509_NAME *name; char *str; /* Init the SSL library and context */ if (!SSL_library_init()){ fprintf(stderr, "SSL library init failed\n"); return (-1); } SSL_load_error_strings(); conn->ssl_meth = SSLv23_client_method(); conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose); if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose)) return (-1); if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose)) return (-1); conn->ssl = SSL_new(conn->ssl_ctx); if (conn->ssl == NULL) { fprintf(stderr, "SSL context creation failed\n"); return (-1); } SSL_set_fd(conn->ssl, conn->sd); #if OPENSSL_VERSION_NUMBER >= 0x0090806fL && !defined(OPENSSL_NO_TLSEXT) if (!SSL_set_tlsext_host_name(conn->ssl, __DECONST(struct url *, URL)->host)) { fprintf(stderr, "TLS server name indication extension failed for host %s\n", URL->host); return (-1); } #endif while ((ret = SSL_connect(conn->ssl)) == -1) { ssl_err = SSL_get_error(conn->ssl, ret); if (ssl_err != SSL_ERROR_WANT_READ && ssl_err != SSL_ERROR_WANT_WRITE) { ERR_print_errors_fp(stderr); return (-1); } } conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); if (conn->ssl_cert == NULL) { fprintf(stderr, "No server SSL certificate\n"); return (-1); } if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) { if (verbose) fetch_info("Verify hostname"); if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) { fprintf(stderr, "SSL certificate subject doesn't match host %s\n", URL->host); return (-1); } } if (verbose) { fetch_info("SSL connection established using %s", SSL_get_cipher(conn->ssl)); name = X509_get_subject_name(conn->ssl_cert); str = X509_NAME_oneline(name, 0, 0); fetch_info("Certificate subject: %s", str); OPENSSL_free(str); name = X509_get_issuer_name(conn->ssl_cert); str = X509_NAME_oneline(name, 0, 0); fetch_info("Certificate issuer: %s", str); OPENSSL_free(str); } return (0); #else (void)conn; (void)verbose; fprintf(stderr, "SSL support disabled\n"); return (-1); #endif } #define FETCH_READ_WAIT -2 #define FETCH_READ_ERROR -1 #define FETCH_READ_DONE 0 #ifdef WITH_SSL static ssize_t fetch_ssl_read(SSL *ssl, char *buf, size_t len) { ssize_t rlen; int ssl_err; rlen = SSL_read(ssl, buf, len); if (rlen < 0) { ssl_err = SSL_get_error(ssl, rlen); if (ssl_err == SSL_ERROR_WANT_READ || ssl_err == SSL_ERROR_WANT_WRITE) { return (FETCH_READ_WAIT); } else { ERR_print_errors_fp(stderr); return (FETCH_READ_ERROR); } } return (rlen); } #endif static ssize_t fetch_socket_read(int sd, char *buf, size_t len) { ssize_t rlen; rlen = read(sd, buf, len); if (rlen < 0) { if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls)) return (FETCH_READ_WAIT); else return (FETCH_READ_ERROR); } return (rlen); } /* * Read a character from a connection w/ timeout */ ssize_t fetch_read(conn_t *conn, char *buf, size_t len) { struct timeval now, timeout, delta; struct pollfd pfd; ssize_t rlen; int deltams; if (fetchTimeout > 0) { gettimeofday(&timeout, NULL); timeout.tv_sec += fetchTimeout; } deltams = INFTIM; memset(&pfd, 0, sizeof pfd); pfd.fd = conn->sd; pfd.events = POLLIN | POLLERR; for (;;) { /* * The socket is non-blocking. Instead of the canonical * poll() -> read(), we do the following: * * 1) call read() or SSL_read(). * 2) if we received some data, return it. * 3) if an error occurred, return -1. * 4) if read() or SSL_read() signaled EOF, return. * 5) if we did not receive any data but we're not at EOF, * call poll(). * * In the SSL case, this is necessary because if we * receive a close notification, we have to call * SSL_read() one additional time after we've read * everything we received. * * In the non-SSL case, it may improve performance (very * slightly) when reading small amounts of data. */ #ifdef WITH_SSL if (conn->ssl != NULL) rlen = fetch_ssl_read(conn->ssl, buf, len); else #endif rlen = fetch_socket_read(conn->sd, buf, len); if (rlen >= 0) { break; } else if (rlen == FETCH_READ_ERROR) { fetch_syserr(); return (-1); } // assert(rlen == FETCH_READ_WAIT); if (fetchTimeout > 0) { gettimeofday(&now, NULL); if (!timercmp(&timeout, &now, >)) { errno = ETIMEDOUT; fetch_syserr(); return (-1); } timersub(&timeout, &now, &delta); deltams = delta.tv_sec * 1000 + delta.tv_usec / 1000;; } errno = 0; pfd.revents = 0; if (poll(&pfd, 1, deltams) < 0) { if (errno == EINTR && fetchRestartCalls) continue; fetch_syserr(); return (-1); } } return (rlen); } /* * Read a line of text from a connection w/ timeout */ #define MIN_BUF_SIZE 1024 int fetch_getln(conn_t *conn) { char *tmp; size_t tmpsize; ssize_t len; char c; if (conn->buf == NULL) { if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { errno = ENOMEM; return (-1); } conn->bufsize = MIN_BUF_SIZE; } conn->buf[0] = '\0'; conn->buflen = 0; do { len = fetch_read(conn, &c, 1); if (len == -1) return (-1); if (len == 0) break; conn->buf[conn->buflen++] = c; if (conn->buflen == conn->bufsize) { tmp = conn->buf; tmpsize = conn->bufsize * 2 + 1; if ((tmp = realloc(tmp, tmpsize)) == NULL) { errno = ENOMEM; return (-1); } conn->buf = tmp; conn->bufsize = tmpsize; } } while (c != '\n'); conn->buf[conn->buflen] = '\0'; DEBUG(fprintf(stderr, "<<< %s", conn->buf)); return (0); } /* * Write to a connection w/ timeout */ ssize_t fetch_write(conn_t *conn, const char *buf, size_t len) { struct iovec iov; iov.iov_base = __DECONST(char *, buf); iov.iov_len = len; return fetch_writev(conn, &iov, 1); } /* * Write a vector to a connection w/ timeout * Note: can modify the iovec. */ ssize_t fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) { struct timeval now, timeout, delta; struct pollfd pfd; ssize_t wlen, total; int deltams; memset(&pfd, 0, sizeof pfd); if (fetchTimeout) { pfd.fd = conn->sd; pfd.events = POLLOUT | POLLERR; gettimeofday(&timeout, NULL); timeout.tv_sec += fetchTimeout; } total = 0; while (iovcnt > 0) { while (fetchTimeout && pfd.revents == 0) { gettimeofday(&now, NULL); if (!timercmp(&timeout, &now, >)) { errno = ETIMEDOUT; fetch_syserr(); return (-1); } timersub(&timeout, &now, &delta); deltams = delta.tv_sec * 1000 + delta.tv_usec / 1000; errno = 0; pfd.revents = 0; if (poll(&pfd, 1, deltams) < 0) { if (errno == EINTR && fetchRestartCalls) continue; return (-1); } } errno = 0; #ifdef WITH_SSL if (conn->ssl != NULL) wlen = SSL_write(conn->ssl, iov->iov_base, iov->iov_len); else #endif wlen = writev(conn->sd, iov, iovcnt); if (wlen == 0) { /* we consider a short write a failure */ /* XXX perhaps we shouldn't in the SSL case */ errno = EPIPE; fetch_syserr(); return (-1); } if (wlen < 0) { if (errno == EINTR && fetchRestartCalls) continue; return (-1); } total += wlen; while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { wlen -= iov->iov_len; iov++; iovcnt--; } if (iovcnt > 0) { iov->iov_len -= wlen; iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; } } return (total); } /* * Write a line of text to a connection w/ timeout */ int fetch_putln(conn_t *conn, const char *str, size_t len) { struct iovec iov[2]; int ret; DEBUG(fprintf(stderr, ">>> %s\n", str)); iov[0].iov_base = __DECONST(char *, str); iov[0].iov_len = len; iov[1].iov_base = __DECONST(char *, ENDL); iov[1].iov_len = sizeof(ENDL); if (len == 0) ret = fetch_writev(conn, &iov[1], 1); else ret = fetch_writev(conn, iov, 2); if (ret == -1) return (-1); return (0); } /* * Close connection */ int fetch_close(conn_t *conn) { int ret; if (--conn->ref > 0) return (0); #ifdef WITH_SSL if (conn->ssl) { SSL_shutdown(conn->ssl); SSL_set_connect_state(conn->ssl); SSL_free(conn->ssl); conn->ssl = NULL; } if (conn->ssl_ctx) { SSL_CTX_free(conn->ssl_ctx); conn->ssl_ctx = NULL; } if (conn->ssl_cert) { X509_free(conn->ssl_cert); conn->ssl_cert = NULL; } #endif ret = close(conn->sd); free(conn->buf); free(conn); return (ret); } /*** Directory-related utility functions *************************************/ int fetch_add_entry(struct url_ent **p, int *size, int *len, const char *name, struct url_stat *us) { struct url_ent *tmp; if (*p == NULL) { *size = 0; *len = 0; } if (*len >= *size - 1) { tmp = realloc(*p, (*size * 2 + 1) * sizeof(**p)); if (tmp == NULL) { errno = ENOMEM; fetch_syserr(); return (-1); } *size = (*size * 2 + 1); *p = tmp; } tmp = *p + *len; snprintf(tmp->name, PATH_MAX, "%s", name); memcpy(&tmp->stat, us, sizeof(*us)); (*len)++; (++tmp)->name[0] = 0; return (0); } /*** Authentication-related utility functions ********************************/ static const char * fetch_read_word(FILE *f) { static char word[1024]; if (fscanf(f, " %1023s ", word) != 1) return (NULL); return (word); } /* * Get authentication data for a URL from .netrc */ int fetch_netrc_auth(struct url *url) { char fn[PATH_MAX]; const char *word; char *p; FILE *f; if ((p = getenv("NETRC")) != NULL) { if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { fetch_info("$NETRC specifies a file name " "longer than PATH_MAX"); return (-1); } } else { if ((p = getenv("HOME")) != NULL) { struct passwd *pwd; if ((pwd = getpwuid(getuid())) == NULL || (p = pwd->pw_dir) == NULL) return (-1); } if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) return (-1); } if ((f = fopen(fn, "r")) == NULL) return (-1); while ((word = fetch_read_word(f)) != NULL) { if (strcmp(word, "default") == 0) { DEBUG(fetch_info("Using default .netrc settings")); break; } if (strcmp(word, "machine") == 0 && (word = fetch_read_word(f)) != NULL && strcasecmp(word, url->host) == 0) { DEBUG(fetch_info("Using .netrc settings for %s", word)); break; } } if (word == NULL) goto ferr; while ((word = fetch_read_word(f)) != NULL) { if (strcmp(word, "login") == 0) { if ((word = fetch_read_word(f)) == NULL) goto ferr; if (snprintf(url->user, sizeof(url->user), "%s", word) > (int)sizeof(url->user)) { fetch_info("login name in .netrc is too long"); url->user[0] = '\0'; } } else if (strcmp(word, "password") == 0) { if ((word = fetch_read_word(f)) == NULL) goto ferr; if (snprintf(url->pwd, sizeof(url->pwd), "%s", word) > (int)sizeof(url->pwd)) { fetch_info("password in .netrc is too long"); url->pwd[0] = '\0'; } } else if (strcmp(word, "account") == 0) { if ((word = fetch_read_word(f)) == NULL) goto ferr; /* XXX not supported! */ } else { break; } } fclose(f); return (0); ferr: fclose(f); return (-1); } /* * The no_proxy environment variable specifies a set of domains for * which the proxy should not be consulted; the contents is a comma-, * or space-separated list of domain names. A single asterisk will * override all proxy variables and no transactions will be proxied * (for compatability with lynx and curl, see the discussion at * ). */ int fetch_no_proxy_match(const char *host) { const char *no_proxy, *p, *q; size_t h_len, d_len; if ((no_proxy = getenv("NO_PROXY")) == NULL && (no_proxy = getenv("no_proxy")) == NULL) return (0); /* asterisk matches any hostname */ if (strcmp(no_proxy, "*") == 0) return (1); h_len = strlen(host); p = no_proxy; do { /* position p at the beginning of a domain suffix */ while (*p == ',' || isspace((unsigned char)*p)) p++; /* position q at the first separator character */ for (q = p; *q; ++q) if (*q == ',' || isspace((unsigned char)*q)) break; d_len = q - p; if (d_len > 0 && h_len >= d_len && strncasecmp(host + h_len - d_len, p, d_len) == 0) { /* domain name matches */ return (1); } p = q + 1; } while (*q); return (0); } diff --git a/lib/libfetch/common.h b/lib/libfetch/common.h index ba45534b66b2..875eef196e98 100644 --- a/lib/libfetch/common.h +++ b/lib/libfetch/common.h @@ -1,128 +1,128 @@ /*- - * Copyright (c) 1998-2011 Dag-Erling Smørgrav + * Copyright (c) 1998-2014 Dag-Erling Smørgrav * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer * in this position and unchanged. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * $FreeBSD$ */ #ifndef _COMMON_H_INCLUDED #define _COMMON_H_INCLUDED #define FTP_DEFAULT_PORT 21 #define HTTP_DEFAULT_PORT 80 #define FTP_DEFAULT_PROXY_PORT 21 #define HTTP_DEFAULT_PROXY_PORT 3128 #ifdef WITH_SSL #include #include #include #include #include #endif /* Connection */ typedef struct fetchconn conn_t; struct fetchconn { int sd; /* socket descriptor */ char *buf; /* buffer */ size_t bufsize; /* buffer size */ size_t buflen; /* length of buffer contents */ int err; /* last protocol reply code */ #ifdef WITH_SSL SSL *ssl; /* SSL handle */ SSL_CTX *ssl_ctx; /* SSL context */ X509 *ssl_cert; /* server certificate */ const SSL_METHOD *ssl_meth; /* SSL method */ #endif int ref; /* reference count */ }; /* Structure used for error message lists */ struct fetcherr { const int num; const int cat; const char *string; }; /* for fetch_writev */ struct iovec; void fetch_seterr(struct fetcherr *, int); void fetch_syserr(void); void fetch_info(const char *, ...); int fetch_default_port(const char *); int fetch_default_proxy_port(const char *); int fetch_bind(int, int, const char *); conn_t *fetch_connect(const char *, int, int, int); conn_t *fetch_reopen(int); conn_t *fetch_ref(conn_t *); #ifdef WITH_SSL int fetch_ssl_cb_verify_crt(int, X509_STORE_CTX*); #endif int fetch_ssl(conn_t *, const struct url *, int); ssize_t fetch_read(conn_t *, char *, size_t); int fetch_getln(conn_t *); ssize_t fetch_write(conn_t *, const char *, size_t); ssize_t fetch_writev(conn_t *, struct iovec *, int); int fetch_putln(conn_t *, const char *, size_t); int fetch_close(conn_t *); int fetch_add_entry(struct url_ent **, int *, int *, const char *, struct url_stat *); int fetch_netrc_auth(struct url *url); int fetch_no_proxy_match(const char *); #define ftp_seterr(n) fetch_seterr(ftp_errlist, n) #define http_seterr(n) fetch_seterr(http_errlist, n) #define netdb_seterr(n) fetch_seterr(netdb_errlist, n) #define url_seterr(n) fetch_seterr(url_errlist, n) #ifndef NDEBUG #define DEBUG(x) do { if (fetchDebug) { x; } } while (0) #else #define DEBUG(x) do { } while (0) #endif /* * I don't really like exporting http_request() and ftp_request(), * but the HTTP and FTP code occasionally needs to cross-call * eachother, and this saves me from adding a lot of special-case code * to handle those cases. * * Note that _*_request() free purl, which is way ugly but saves us a * whole lot of trouble. */ FILE *http_request(struct url *, const char *, struct url_stat *, struct url *, const char *); FILE *ftp_request(struct url *, const char *, struct url_stat *, struct url *, const char *); /* * Check whether a particular flag is set */ #define CHECK_FLAG(x) (flags && strchr(flags, (x))) #endif diff --git a/lib/libfetch/http.c b/lib/libfetch/http.c index 676cbb76d960..b2feedbcd0bf 100644 --- a/lib/libfetch/http.c +++ b/lib/libfetch/http.c @@ -1,2038 +1,2038 @@ /*- - * Copyright (c) 2000-2013 Dag-Erling Smørgrav + * Copyright (c) 2000-2014 Dag-Erling Smørgrav * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer * in this position and unchanged. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); /* * The following copyright applies to the base64 code: * *- * Copyright 1997 Massachusetts Institute of Technology * * Permission to use, copy, modify, and distribute this software and * its documentation for any purpose and without fee is hereby * granted, provided that both the above copyright notice and this * permission notice appear in all copies, that both the above * copyright notice and this permission notice appear in all * supporting documentation, and that the name of M.I.T. not be used * in advertising or publicity pertaining to distribution of the * software without specific, written prior permission. M.I.T. makes * no representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied * warranty. * * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef WITH_SSL #include #define MD5Init(c) MD5_Init(c) #define MD5Update(c, data, len) MD5_Update(c, data, len) #define MD5Final(md, c) MD5_Final(md, c) #else #include #endif #include #include #include "fetch.h" #include "common.h" #include "httperr.h" /* Maximum number of redirects to follow */ #define MAX_REDIRECT 20 /* Symbolic names for reply codes we care about */ #define HTTP_OK 200 #define HTTP_PARTIAL 206 #define HTTP_MOVED_PERM 301 #define HTTP_MOVED_TEMP 302 #define HTTP_SEE_OTHER 303 #define HTTP_NOT_MODIFIED 304 #define HTTP_USE_PROXY 305 #define HTTP_TEMP_REDIRECT 307 #define HTTP_PERM_REDIRECT 308 #define HTTP_NEED_AUTH 401 #define HTTP_NEED_PROXY_AUTH 407 #define HTTP_BAD_RANGE 416 #define HTTP_PROTOCOL_ERROR 999 #define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ || (xyz) == HTTP_MOVED_TEMP \ || (xyz) == HTTP_TEMP_REDIRECT \ || (xyz) == HTTP_USE_PROXY \ || (xyz) == HTTP_SEE_OTHER) #define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599) /***************************************************************************** * I/O functions for decoding chunked streams */ struct httpio { conn_t *conn; /* connection */ int chunked; /* chunked mode */ char *buf; /* chunk buffer */ size_t bufsize; /* size of chunk buffer */ ssize_t buflen; /* amount of data currently in buffer */ int bufpos; /* current read offset in buffer */ int eof; /* end-of-file flag */ int error; /* error flag */ size_t chunksize; /* remaining size of current chunk */ #ifndef NDEBUG size_t total; #endif }; /* * Get next chunk header */ static int http_new_chunk(struct httpio *io) { char *p; if (fetch_getln(io->conn) == -1) return (-1); if (io->conn->buflen < 2 || !isxdigit((unsigned char)*io->conn->buf)) return (-1); for (p = io->conn->buf; *p && !isspace((unsigned char)*p); ++p) { if (*p == ';') break; if (!isxdigit((unsigned char)*p)) return (-1); if (isdigit((unsigned char)*p)) { io->chunksize = io->chunksize * 16 + *p - '0'; } else { io->chunksize = io->chunksize * 16 + 10 + tolower((unsigned char)*p) - 'a'; } } #ifndef NDEBUG if (fetchDebug) { io->total += io->chunksize; if (io->chunksize == 0) fprintf(stderr, "%s(): end of last chunk\n", __func__); else fprintf(stderr, "%s(): new chunk: %lu (%lu)\n", __func__, (unsigned long)io->chunksize, (unsigned long)io->total); } #endif return (io->chunksize); } /* * Grow the input buffer to at least len bytes */ static inline int http_growbuf(struct httpio *io, size_t len) { char *tmp; if (io->bufsize >= len) return (0); if ((tmp = realloc(io->buf, len)) == NULL) return (-1); io->buf = tmp; io->bufsize = len; return (0); } /* * Fill the input buffer, do chunk decoding on the fly */ static ssize_t http_fillbuf(struct httpio *io, size_t len) { ssize_t nbytes; char ch; if (io->error) return (-1); if (io->eof) return (0); if (io->chunked == 0) { if (http_growbuf(io, len) == -1) return (-1); if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) { io->error = errno; return (-1); } io->buflen = nbytes; io->bufpos = 0; return (io->buflen); } if (io->chunksize == 0) { switch (http_new_chunk(io)) { case -1: io->error = EPROTO; return (-1); case 0: io->eof = 1; return (0); } } if (len > io->chunksize) len = io->chunksize; if (http_growbuf(io, len) == -1) return (-1); if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) { io->error = errno; return (-1); } io->buflen = nbytes; io->chunksize -= io->buflen; if (io->chunksize == 0) { if (fetch_read(io->conn, &ch, 1) != 1 || ch != '\r' || fetch_read(io->conn, &ch, 1) != 1 || ch != '\n') return (-1); } io->bufpos = 0; return (io->buflen); } /* * Read function */ static int http_readfn(void *v, char *buf, int len) { struct httpio *io = (struct httpio *)v; int rlen; if (io->error) return (-1); if (io->eof) return (0); /* empty buffer */ if (!io->buf || io->bufpos == io->buflen) { if ((rlen = http_fillbuf(io, len)) < 0) { if ((errno = io->error) == EINTR) io->error = 0; return (-1); } else if (rlen == 0) { return (0); } } rlen = io->buflen - io->bufpos; if (len < rlen) rlen = len; memcpy(buf, io->buf + io->bufpos, rlen); io->bufpos += rlen; return (rlen); } /* * Write function */ static int http_writefn(void *v, const char *buf, int len) { struct httpio *io = (struct httpio *)v; return (fetch_write(io->conn, buf, len)); } /* * Close function */ static int http_closefn(void *v) { struct httpio *io = (struct httpio *)v; int r; r = fetch_close(io->conn); if (io->buf) free(io->buf); free(io); return (r); } /* * Wrap a file descriptor up */ static FILE * http_funopen(conn_t *conn, int chunked) { struct httpio *io; FILE *f; if ((io = calloc(1, sizeof(*io))) == NULL) { fetch_syserr(); return (NULL); } io->conn = conn; io->chunked = chunked; f = funopen(io, http_readfn, http_writefn, NULL, http_closefn); if (f == NULL) { fetch_syserr(); free(io); return (NULL); } return (f); } /***************************************************************************** * Helper functions for talking to the server and parsing its replies */ /* Header types */ typedef enum { hdr_syserror = -2, hdr_error = -1, hdr_end = 0, hdr_unknown = 1, hdr_content_length, hdr_content_range, hdr_last_modified, hdr_location, hdr_transfer_encoding, hdr_www_authenticate, hdr_proxy_authenticate, } hdr_t; /* Names of interesting headers */ static struct { hdr_t num; const char *name; } hdr_names[] = { { hdr_content_length, "Content-Length" }, { hdr_content_range, "Content-Range" }, { hdr_last_modified, "Last-Modified" }, { hdr_location, "Location" }, { hdr_transfer_encoding, "Transfer-Encoding" }, { hdr_www_authenticate, "WWW-Authenticate" }, { hdr_proxy_authenticate, "Proxy-Authenticate" }, { hdr_unknown, NULL }, }; /* * Send a formatted line; optionally echo to terminal */ static int http_cmd(conn_t *conn, const char *fmt, ...) { va_list ap; size_t len; char *msg; int r; va_start(ap, fmt); len = vasprintf(&msg, fmt, ap); va_end(ap); if (msg == NULL) { errno = ENOMEM; fetch_syserr(); return (-1); } r = fetch_putln(conn, msg, len); free(msg); if (r == -1) { fetch_syserr(); return (-1); } return (0); } /* * Get and parse status line */ static int http_get_reply(conn_t *conn) { char *p; if (fetch_getln(conn) == -1) return (-1); /* * A valid status line looks like "HTTP/m.n xyz reason" where m * and n are the major and minor protocol version numbers and xyz * is the reply code. * Unfortunately, there are servers out there (NCSA 1.5.1, to name * just one) that do not send a version number, so we can't rely * on finding one, but if we do, insist on it being 1.0 or 1.1. * We don't care about the reason phrase. */ if (strncmp(conn->buf, "HTTP", 4) != 0) return (HTTP_PROTOCOL_ERROR); p = conn->buf + 4; if (*p == '/') { if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) return (HTTP_PROTOCOL_ERROR); p += 4; } if (*p != ' ' || !isdigit((unsigned char)p[1]) || !isdigit((unsigned char)p[2]) || !isdigit((unsigned char)p[3])) return (HTTP_PROTOCOL_ERROR); conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'); return (conn->err); } /* * Check a header; if the type matches the given string, return a pointer * to the beginning of the value. */ static const char * http_match(const char *str, const char *hdr) { while (*str && *hdr && tolower((unsigned char)*str++) == tolower((unsigned char)*hdr++)) /* nothing */; if (*str || *hdr != ':') return (NULL); while (*hdr && isspace((unsigned char)*++hdr)) /* nothing */; return (hdr); } /* * Get the next header and return the appropriate symbolic code. We * need to read one line ahead for checking for a continuation line * belonging to the current header (continuation lines start with * white space). * * We get called with a fresh line already in the conn buffer, either * from the previous http_next_header() invocation, or, the first * time, from a fetch_getln() performed by our caller. * * This stops when we encounter an empty line (we dont read beyond the header * area). * * Note that the "headerbuf" is just a place to return the result. Its * contents are not used for the next call. This means that no cleanup * is needed when ie doing another connection, just call the cleanup when * fully done to deallocate memory. */ /* Limit the max number of continuation lines to some reasonable value */ #define HTTP_MAX_CONT_LINES 10 /* Place into which to build a header from one or several lines */ typedef struct { char *buf; /* buffer */ size_t bufsize; /* buffer size */ size_t buflen; /* length of buffer contents */ } http_headerbuf_t; static void init_http_headerbuf(http_headerbuf_t *buf) { buf->buf = NULL; buf->bufsize = 0; buf->buflen = 0; } static void clean_http_headerbuf(http_headerbuf_t *buf) { if (buf->buf) free(buf->buf); init_http_headerbuf(buf); } /* Remove whitespace at the end of the buffer */ static void http_conn_trimright(conn_t *conn) { while (conn->buflen && isspace((unsigned char)conn->buf[conn->buflen - 1])) conn->buflen--; conn->buf[conn->buflen] = '\0'; } static hdr_t http_next_header(conn_t *conn, http_headerbuf_t *hbuf, const char **p) { unsigned int i, len; /* * Have to do the stripping here because of the first line. So * it's done twice for the subsequent lines. No big deal */ http_conn_trimright(conn); if (conn->buflen == 0) return (hdr_end); /* Copy the line to the headerbuf */ if (hbuf->bufsize < conn->buflen + 1) { if ((hbuf->buf = realloc(hbuf->buf, conn->buflen + 1)) == NULL) return (hdr_syserror); hbuf->bufsize = conn->buflen + 1; } strcpy(hbuf->buf, conn->buf); hbuf->buflen = conn->buflen; /* * Fetch possible continuation lines. Stop at 1st non-continuation * and leave it in the conn buffer */ for (i = 0; i < HTTP_MAX_CONT_LINES; i++) { if (fetch_getln(conn) == -1) return (hdr_syserror); /* * Note: we carry on the idea from the previous version * that a pure whitespace line is equivalent to an empty * one (so it's not continuation and will be handled when * we are called next) */ http_conn_trimright(conn); if (conn->buf[0] != ' ' && conn->buf[0] != "\t"[0]) break; /* Got a continuation line. Concatenate to previous */ len = hbuf->buflen + conn->buflen; if (hbuf->bufsize < len + 1) { len *= 2; if ((hbuf->buf = realloc(hbuf->buf, len + 1)) == NULL) return (hdr_syserror); hbuf->bufsize = len + 1; } strcpy(hbuf->buf + hbuf->buflen, conn->buf); hbuf->buflen += conn->buflen; } /* * We could check for malformed headers but we don't really care. * A valid header starts with a token immediately followed by a * colon; a token is any sequence of non-control, non-whitespace * characters except "()<>@,;:\\\"{}". */ for (i = 0; hdr_names[i].num != hdr_unknown; i++) if ((*p = http_match(hdr_names[i].name, hbuf->buf)) != NULL) return (hdr_names[i].num); return (hdr_unknown); } /************************** * [Proxy-]Authenticate header parsing */ /* * Read doublequote-delimited string into output buffer obuf (allocated * by caller, whose responsibility it is to ensure that it's big enough) * cp points to the first char after the initial '"' * Handles \ quoting * Returns pointer to the first char after the terminating double quote, or * NULL for error. */ static const char * http_parse_headerstring(const char *cp, char *obuf) { for (;;) { switch (*cp) { case 0: /* Unterminated string */ *obuf = 0; return (NULL); case '"': /* Ending quote */ *obuf = 0; return (++cp); case '\\': if (*++cp == 0) { *obuf = 0; return (NULL); } /* FALLTHROUGH */ default: *obuf++ = *cp++; } } } /* Http auth challenge schemes */ typedef enum {HTTPAS_UNKNOWN, HTTPAS_BASIC,HTTPAS_DIGEST} http_auth_schemes_t; /* Data holder for a Basic or Digest challenge. */ typedef struct { http_auth_schemes_t scheme; char *realm; char *qop; char *nonce; char *opaque; char *algo; int stale; int nc; /* Nonce count */ } http_auth_challenge_t; static void init_http_auth_challenge(http_auth_challenge_t *b) { b->scheme = HTTPAS_UNKNOWN; b->realm = b->qop = b->nonce = b->opaque = b->algo = NULL; b->stale = b->nc = 0; } static void clean_http_auth_challenge(http_auth_challenge_t *b) { if (b->realm) free(b->realm); if (b->qop) free(b->qop); if (b->nonce) free(b->nonce); if (b->opaque) free(b->opaque); if (b->algo) free(b->algo); init_http_auth_challenge(b); } /* Data holder for an array of challenges offered in an http response. */ #define MAX_CHALLENGES 10 typedef struct { http_auth_challenge_t *challenges[MAX_CHALLENGES]; int count; /* Number of parsed challenges in the array */ int valid; /* We did parse an authenticate header */ } http_auth_challenges_t; static void init_http_auth_challenges(http_auth_challenges_t *cs) { int i; for (i = 0; i < MAX_CHALLENGES; i++) cs->challenges[i] = NULL; cs->count = cs->valid = 0; } static void clean_http_auth_challenges(http_auth_challenges_t *cs) { int i; /* We rely on non-zero pointers being allocated, not on the count */ for (i = 0; i < MAX_CHALLENGES; i++) { if (cs->challenges[i] != NULL) { clean_http_auth_challenge(cs->challenges[i]); free(cs->challenges[i]); } } init_http_auth_challenges(cs); } /* * Enumeration for lexical elements. Separators will be returned as their own * ascii value */ typedef enum {HTTPHL_WORD=256, HTTPHL_STRING=257, HTTPHL_END=258, HTTPHL_ERROR = 259} http_header_lex_t; /* * Determine what kind of token comes next and return possible value * in buf, which is supposed to have been allocated big enough by * caller. Advance input pointer and return element type. */ static int http_header_lex(const char **cpp, char *buf) { size_t l; /* Eat initial whitespace */ *cpp += strspn(*cpp, " \t"); if (**cpp == 0) return (HTTPHL_END); /* Separator ? */ if (**cpp == ',' || **cpp == '=') return (*((*cpp)++)); /* String ? */ if (**cpp == '"') { *cpp = http_parse_headerstring(++*cpp, buf); if (*cpp == NULL) return (HTTPHL_ERROR); return (HTTPHL_STRING); } /* Read other token, until separator or whitespace */ l = strcspn(*cpp, " \t,="); memcpy(buf, *cpp, l); buf[l] = 0; *cpp += l; return (HTTPHL_WORD); } /* * Read challenges from http xxx-authenticate header and accumulate them * in the challenges list structure. * * Headers with multiple challenges are specified by rfc2617, but * servers (ie: squid) often send them in separate headers instead, * which in turn is forbidden by the http spec (multiple headers with * the same name are only allowed for pure comma-separated lists, see * rfc2616 sec 4.2). * * We support both approaches anyway */ static int http_parse_authenticate(const char *cp, http_auth_challenges_t *cs) { int ret = -1; http_header_lex_t lex; char *key = malloc(strlen(cp) + 1); char *value = malloc(strlen(cp) + 1); char *buf = malloc(strlen(cp) + 1); if (key == NULL || value == NULL || buf == NULL) { fetch_syserr(); goto out; } /* In any case we've seen the header and we set the valid bit */ cs->valid = 1; /* Need word first */ lex = http_header_lex(&cp, key); if (lex != HTTPHL_WORD) goto out; /* Loop on challenges */ for (; cs->count < MAX_CHALLENGES; cs->count++) { cs->challenges[cs->count] = malloc(sizeof(http_auth_challenge_t)); if (cs->challenges[cs->count] == NULL) { fetch_syserr(); goto out; } init_http_auth_challenge(cs->challenges[cs->count]); if (!strcasecmp(key, "basic")) { cs->challenges[cs->count]->scheme = HTTPAS_BASIC; } else if (!strcasecmp(key, "digest")) { cs->challenges[cs->count]->scheme = HTTPAS_DIGEST; } else { cs->challenges[cs->count]->scheme = HTTPAS_UNKNOWN; /* * Continue parsing as basic or digest may * follow, and the syntax is the same for * all. We'll just ignore this one when * looking at the list */ } /* Loop on attributes */ for (;;) { /* Key */ lex = http_header_lex(&cp, key); if (lex != HTTPHL_WORD) goto out; /* Equal sign */ lex = http_header_lex(&cp, buf); if (lex != '=') goto out; /* Value */ lex = http_header_lex(&cp, value); if (lex != HTTPHL_WORD && lex != HTTPHL_STRING) goto out; if (!strcasecmp(key, "realm")) cs->challenges[cs->count]->realm = strdup(value); else if (!strcasecmp(key, "qop")) cs->challenges[cs->count]->qop = strdup(value); else if (!strcasecmp(key, "nonce")) cs->challenges[cs->count]->nonce = strdup(value); else if (!strcasecmp(key, "opaque")) cs->challenges[cs->count]->opaque = strdup(value); else if (!strcasecmp(key, "algorithm")) cs->challenges[cs->count]->algo = strdup(value); else if (!strcasecmp(key, "stale")) cs->challenges[cs->count]->stale = strcasecmp(value, "no"); /* Else ignore unknown attributes */ /* Comma or Next challenge or End */ lex = http_header_lex(&cp, key); /* * If we get a word here, this is the beginning of the * next challenge. Break the attributes loop */ if (lex == HTTPHL_WORD) break; if (lex == HTTPHL_END) { /* End while looking for ',' is normal exit */ cs->count++; ret = 0; goto out; } /* Anything else is an error */ if (lex != ',') goto out; } /* End attributes loop */ } /* End challenge loop */ /* * Challenges max count exceeded. This really can't happen * with normal data, something's fishy -> error */ out: if (key) free(key); if (value) free(value); if (buf) free(buf); return (ret); } /* * Parse a last-modified header */ static int http_parse_mtime(const char *p, time_t *mtime) { char locale[64], *r; struct tm tm; strncpy(locale, setlocale(LC_TIME, NULL), sizeof(locale)); setlocale(LC_TIME, "C"); r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); /* XXX should add support for date-2 and date-3 */ setlocale(LC_TIME, locale); if (r == NULL) return (-1); DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d " "%02d:%02d:%02d]\n", tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec)); *mtime = timegm(&tm); return (0); } /* * Parse a content-length header */ static int http_parse_length(const char *p, off_t *length) { off_t len; for (len = 0; *p && isdigit((unsigned char)*p); ++p) len = len * 10 + (*p - '0'); if (*p) return (-1); DEBUG(fprintf(stderr, "content length: [%lld]\n", (long long)len)); *length = len; return (0); } /* * Parse a content-range header */ static int http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) { off_t first, last, len; if (strncasecmp(p, "bytes ", 6) != 0) return (-1); p += 6; if (*p == '*') { first = last = -1; ++p; } else { for (first = 0; *p && isdigit((unsigned char)*p); ++p) first = first * 10 + *p - '0'; if (*p != '-') return (-1); for (last = 0, ++p; *p && isdigit((unsigned char)*p); ++p) last = last * 10 + *p - '0'; } if (first > last || *p != '/') return (-1); for (len = 0, ++p; *p && isdigit((unsigned char)*p); ++p) len = len * 10 + *p - '0'; if (*p || len < last - first + 1) return (-1); if (first == -1) { DEBUG(fprintf(stderr, "content range: [*/%lld]\n", (long long)len)); *length = 0; } else { DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n", (long long)first, (long long)last, (long long)len)); *length = last - first + 1; } *offset = first; *size = len; return (0); } /***************************************************************************** * Helper functions for authorization */ /* * Base64 encoding */ static char * http_base64(const char *src) { static const char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" "abcdefghijklmnopqrstuvwxyz" "0123456789+/"; char *str, *dst; size_t l; int t, r; l = strlen(src); if ((str = malloc(((l + 2) / 3) * 4 + 1)) == NULL) return (NULL); dst = str; r = 0; while (l >= 3) { t = (src[0] << 16) | (src[1] << 8) | src[2]; dst[0] = base64[(t >> 18) & 0x3f]; dst[1] = base64[(t >> 12) & 0x3f]; dst[2] = base64[(t >> 6) & 0x3f]; dst[3] = base64[(t >> 0) & 0x3f]; src += 3; l -= 3; dst += 4; r += 4; } switch (l) { case 2: t = (src[0] << 16) | (src[1] << 8); dst[0] = base64[(t >> 18) & 0x3f]; dst[1] = base64[(t >> 12) & 0x3f]; dst[2] = base64[(t >> 6) & 0x3f]; dst[3] = '='; dst += 4; r += 4; break; case 1: t = src[0] << 16; dst[0] = base64[(t >> 18) & 0x3f]; dst[1] = base64[(t >> 12) & 0x3f]; dst[2] = dst[3] = '='; dst += 4; r += 4; break; case 0: break; } *dst = 0; return (str); } /* * Extract authorization parameters from environment value. * The value is like scheme:realm:user:pass */ typedef struct { char *scheme; char *realm; char *user; char *password; } http_auth_params_t; static void init_http_auth_params(http_auth_params_t *s) { s->scheme = s->realm = s->user = s->password = 0; } static void clean_http_auth_params(http_auth_params_t *s) { if (s->scheme) free(s->scheme); if (s->realm) free(s->realm); if (s->user) free(s->user); if (s->password) free(s->password); init_http_auth_params(s); } static int http_authfromenv(const char *p, http_auth_params_t *parms) { int ret = -1; char *v, *ve; char *str = strdup(p); if (str == NULL) { fetch_syserr(); return (-1); } v = str; if ((ve = strchr(v, ':')) == NULL) goto out; *ve = 0; if ((parms->scheme = strdup(v)) == NULL) { fetch_syserr(); goto out; } v = ve + 1; if ((ve = strchr(v, ':')) == NULL) goto out; *ve = 0; if ((parms->realm = strdup(v)) == NULL) { fetch_syserr(); goto out; } v = ve + 1; if ((ve = strchr(v, ':')) == NULL) goto out; *ve = 0; if ((parms->user = strdup(v)) == NULL) { fetch_syserr(); goto out; } v = ve + 1; if ((parms->password = strdup(v)) == NULL) { fetch_syserr(); goto out; } ret = 0; out: if (ret == -1) clean_http_auth_params(parms); if (str) free(str); return (ret); } /* * Digest response: the code to compute the digest is taken from the * sample implementation in RFC2616 */ #define IN const #define OUT #define HASHLEN 16 typedef char HASH[HASHLEN]; #define HASHHEXLEN 32 typedef char HASHHEX[HASHHEXLEN+1]; static const char *hexchars = "0123456789abcdef"; static void CvtHex(IN HASH Bin, OUT HASHHEX Hex) { unsigned short i; unsigned char j; for (i = 0; i < HASHLEN; i++) { j = (Bin[i] >> 4) & 0xf; Hex[i*2] = hexchars[j]; j = Bin[i] & 0xf; Hex[i*2+1] = hexchars[j]; }; Hex[HASHHEXLEN] = '\0'; }; /* calculate H(A1) as per spec */ static void DigestCalcHA1( IN char * pszAlg, IN char * pszUserName, IN char * pszRealm, IN char * pszPassword, IN char * pszNonce, IN char * pszCNonce, OUT HASHHEX SessionKey ) { MD5_CTX Md5Ctx; HASH HA1; MD5Init(&Md5Ctx); MD5Update(&Md5Ctx, pszUserName, strlen(pszUserName)); MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, pszRealm, strlen(pszRealm)); MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, pszPassword, strlen(pszPassword)); MD5Final(HA1, &Md5Ctx); if (strcasecmp(pszAlg, "md5-sess") == 0) { MD5Init(&Md5Ctx); MD5Update(&Md5Ctx, HA1, HASHLEN); MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); MD5Final(HA1, &Md5Ctx); }; CvtHex(HA1, SessionKey); } /* calculate request-digest/response-digest as per HTTP Digest spec */ static void DigestCalcResponse( IN HASHHEX HA1, /* H(A1) */ IN char * pszNonce, /* nonce from server */ IN char * pszNonceCount, /* 8 hex digits */ IN char * pszCNonce, /* client nonce */ IN char * pszQop, /* qop-value: "", "auth", "auth-int" */ IN char * pszMethod, /* method from the request */ IN char * pszDigestUri, /* requested URL */ IN HASHHEX HEntity, /* H(entity body) if qop="auth-int" */ OUT HASHHEX Response /* request-digest or response-digest */ ) { /* DEBUG(fprintf(stderr, "Calc: HA1[%s] Nonce[%s] qop[%s] method[%s] URI[%s]\n", HA1, pszNonce, pszQop, pszMethod, pszDigestUri));*/ MD5_CTX Md5Ctx; HASH HA2; HASH RespHash; HASHHEX HA2Hex; // calculate H(A2) MD5Init(&Md5Ctx); MD5Update(&Md5Ctx, pszMethod, strlen(pszMethod)); MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, pszDigestUri, strlen(pszDigestUri)); if (strcasecmp(pszQop, "auth-int") == 0) { MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, HEntity, HASHHEXLEN); }; MD5Final(HA2, &Md5Ctx); CvtHex(HA2, HA2Hex); // calculate response MD5Init(&Md5Ctx); MD5Update(&Md5Ctx, HA1, HASHHEXLEN); MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); MD5Update(&Md5Ctx, ":", 1); if (*pszQop) { MD5Update(&Md5Ctx, pszNonceCount, strlen(pszNonceCount)); MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, pszQop, strlen(pszQop)); MD5Update(&Md5Ctx, ":", 1); }; MD5Update(&Md5Ctx, HA2Hex, HASHHEXLEN); MD5Final(RespHash, &Md5Ctx); CvtHex(RespHash, Response); } /* * Generate/Send a Digest authorization header * This looks like: [Proxy-]Authorization: credentials * * credentials = "Digest" digest-response * digest-response = 1#( username | realm | nonce | digest-uri * | response | [ algorithm ] | [cnonce] | * [opaque] | [message-qop] | * [nonce-count] | [auth-param] ) * username = "username" "=" username-value * username-value = quoted-string * digest-uri = "uri" "=" digest-uri-value * digest-uri-value = request-uri ; As specified by HTTP/1.1 * message-qop = "qop" "=" qop-value * cnonce = "cnonce" "=" cnonce-value * cnonce-value = nonce-value * nonce-count = "nc" "=" nc-value * nc-value = 8LHEX * response = "response" "=" request-digest * request-digest = <"> 32LHEX <"> */ static int http_digest_auth(conn_t *conn, const char *hdr, http_auth_challenge_t *c, http_auth_params_t *parms, struct url *url) { int r; char noncecount[10]; char cnonce[40]; char *options = 0; if (!c->realm || !c->nonce) { DEBUG(fprintf(stderr, "realm/nonce not set in challenge\n")); return(-1); } if (!c->algo) c->algo = strdup(""); if (asprintf(&options, "%s%s%s%s", *c->algo? ",algorithm=" : "", c->algo, c->opaque? ",opaque=" : "", c->opaque?c->opaque:"")== -1) return (-1); if (!c->qop) { c->qop = strdup(""); *noncecount = 0; *cnonce = 0; } else { c->nc++; sprintf(noncecount, "%08x", c->nc); /* We don't try very hard with the cnonce ... */ sprintf(cnonce, "%x%lx", getpid(), (unsigned long)time(0)); } HASHHEX HA1; DigestCalcHA1(c->algo, parms->user, c->realm, parms->password, c->nonce, cnonce, HA1); DEBUG(fprintf(stderr, "HA1: [%s]\n", HA1)); HASHHEX digest; DigestCalcResponse(HA1, c->nonce, noncecount, cnonce, c->qop, "GET", url->doc, "", digest); if (c->qop[0]) { r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," "nonce=\"%s\",uri=\"%s\",response=\"%s\"," "qop=\"auth\", cnonce=\"%s\", nc=%s%s", hdr, parms->user, c->realm, c->nonce, url->doc, digest, cnonce, noncecount, options); } else { r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," "nonce=\"%s\",uri=\"%s\",response=\"%s\"%s", hdr, parms->user, c->realm, c->nonce, url->doc, digest, options); } if (options) free(options); return (r); } /* * Encode username and password */ static int http_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd) { char *upw, *auth; int r; DEBUG(fprintf(stderr, "basic: usr: [%s]\n", usr)); DEBUG(fprintf(stderr, "basic: pwd: [%s]\n", pwd)); if (asprintf(&upw, "%s:%s", usr, pwd) == -1) return (-1); auth = http_base64(upw); free(upw); if (auth == NULL) return (-1); r = http_cmd(conn, "%s: Basic %s", hdr, auth); free(auth); return (r); } /* * Chose the challenge to answer and call the appropriate routine to * produce the header. */ static int http_authorize(conn_t *conn, const char *hdr, http_auth_challenges_t *cs, http_auth_params_t *parms, struct url *url) { http_auth_challenge_t *basic = NULL; http_auth_challenge_t *digest = NULL; int i; /* If user or pass are null we're not happy */ if (!parms->user || !parms->password) { DEBUG(fprintf(stderr, "NULL usr or pass\n")); return (-1); } /* Look for a Digest and a Basic challenge */ for (i = 0; i < cs->count; i++) { if (cs->challenges[i]->scheme == HTTPAS_BASIC) basic = cs->challenges[i]; if (cs->challenges[i]->scheme == HTTPAS_DIGEST) digest = cs->challenges[i]; } /* Error if "Digest" was specified and there is no Digest challenge */ if (!digest && (parms->scheme && !strcasecmp(parms->scheme, "digest"))) { DEBUG(fprintf(stderr, "Digest auth in env, not supported by peer\n")); return (-1); } /* * If "basic" was specified in the environment, or there is no Digest * challenge, do the basic thing. Don't need a challenge for this, * so no need to check basic!=NULL */ if (!digest || (parms->scheme && !strcasecmp(parms->scheme,"basic"))) return (http_basic_auth(conn,hdr,parms->user,parms->password)); /* Else, prefer digest. We just checked that it's not NULL */ return (http_digest_auth(conn, hdr, digest, parms, url)); } /***************************************************************************** * Helper functions for connecting to a server or proxy */ /* * Connect to the correct HTTP server or proxy. */ static conn_t * http_connect(struct url *URL, struct url *purl, const char *flags) { struct url *curl; conn_t *conn; int verbose; int af, val; #ifdef INET6 af = AF_UNSPEC; #else af = AF_INET; #endif verbose = CHECK_FLAG('v'); if (CHECK_FLAG('4')) af = AF_INET; #ifdef INET6 else if (CHECK_FLAG('6')) af = AF_INET6; #endif curl = (purl != NULL) ? purl : URL; if ((conn = fetch_connect(curl->host, curl->port, af, verbose)) == NULL) /* fetch_connect() has already set an error code */ return (NULL); if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && purl) { http_cmd(conn, "CONNECT %s:%d HTTP/1.1", URL->host, URL->port); http_cmd(conn, "Host: %s:%d", URL->host, URL->port); http_cmd(conn, ""); if (http_get_reply(conn) != HTTP_OK) { fetch_close(conn); return (NULL); } http_get_reply(conn); } if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && fetch_ssl(conn, URL, verbose) == -1) { fetch_close(conn); /* grrr */ errno = EAUTH; fetch_syserr(); return (NULL); } val = 1; setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof(val)); return (conn); } static struct url * http_get_proxy(struct url * url, const char *flags) { struct url *purl; char *p; if (flags != NULL && strchr(flags, 'd') != NULL) return (NULL); if (fetch_no_proxy_match(url->host)) return (NULL); if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && *p && (purl = fetchParseURL(p))) { if (!*purl->scheme) strcpy(purl->scheme, SCHEME_HTTP); if (!purl->port) purl->port = fetch_default_proxy_port(purl->scheme); if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) return (purl); fetchFreeURL(purl); } return (NULL); } static void http_print_html(FILE *out, FILE *in) { size_t len; char *line, *p, *q; int comment, tag; comment = tag = 0; while ((line = fgetln(in, &len)) != NULL) { while (len && isspace((unsigned char)line[len - 1])) --len; for (p = q = line; q < line + len; ++q) { if (comment && *q == '-') { if (q + 2 < line + len && strcmp(q, "-->") == 0) { tag = comment = 0; q += 2; } } else if (tag && !comment && *q == '>') { p = q + 1; tag = 0; } else if (!tag && *q == '<') { if (q > p) fwrite(p, q - p, 1, out); tag = 1; if (q + 3 < line + len && strcmp(q, "