git_mkstemps: correctly test return value of open()

diff --git a/imap-send.c b/imap-send.c
index 94f53c2c1d41d13c0e276280f594a4ec98752fa3..49ba841cbaabb6da9bfab1bf54f63a50c3069dd9 100644 (file)
--- a/imap-send.c
+++ b/imap-send.c
@@ -25,11 +25,13 @@
 #include "cache.h"
 #include "exec_cmd.h"
 #include "run-command.h"
+#include "prompt.h"
 #ifdef NO_OPENSSL
 typedef void *SSL;
 #else
 #include <openssl/evp.h>
 #include <openssl/hmac.h>
+#include <openssl/x509v3.h>
 #endif
 
 struct store_conf {
@@ -138,7 +140,6 @@ static struct imap_server_conf server = {
 struct imap_store_conf {
        struct store_conf gen;
        struct imap_server_conf *server;
-       unsigned use_namespace:1;
 };
 
 #define NIL    (void *)0x1
@@ -275,6 +276,53 @@ static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int ve
 
 #else
 
+static int host_matches(const char *host, const char *pattern)
+{
+       if (pattern[0] == '*' && pattern[1] == '.') {
+               pattern += 2;
+               if (!(host = strchr(host, '.')))
+                       return 0;
+               host++;
+       }
+
+       return *host && *pattern && !strcasecmp(host, pattern);
+}
+
+static int verify_hostname(X509 *cert, const char *hostname)
+{
+       int len;
+       X509_NAME *subj;
+       char cname[1000];
+       int i, found;
+       STACK_OF(GENERAL_NAME) *subj_alt_names;
+
+       /* try the DNS subjectAltNames */
+       found = 0;
+       if ((subj_alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL))) {
+               int num_subj_alt_names = sk_GENERAL_NAME_num(subj_alt_names);
+               for (i = 0; !found && i < num_subj_alt_names; i++) {
+                       GENERAL_NAME *subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
+                       if (subj_alt_name->type == GEN_DNS &&
+                           strlen((const char *)subj_alt_name->d.ia5->data) == (size_t)subj_alt_name->d.ia5->length &&
+                           host_matches(hostname, (const char *)(subj_alt_name->d.ia5->data)))
+                               found = 1;
+               }
+               sk_GENERAL_NAME_pop_free(subj_alt_names, GENERAL_NAME_free);
+       }
+       if (found)
+               return 0;
+
+       /* try the common name */
+       if (!(subj = X509_get_subject_name(cert)))
+               return error("cannot get certificate subject");
+       if ((len = X509_NAME_get_text_by_NID(subj, NID_commonName, cname, sizeof(cname))) < 0)
+               return error("cannot get certificate common name");
+       if (strlen(cname) == (size_t)len && host_matches(hostname, cname))
+               return 0;
+       return error("certificate owner '%s' does not match hostname '%s'",
+                    cname, hostname);
+}
+
 static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
 {
 #if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
@@ -284,6 +332,7 @@ static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int ve
 #endif
        SSL_CTX *ctx;
        int ret;
+       X509 *cert;
 
        SSL_library_init();
        SSL_load_error_strings();
@@ -321,12 +370,32 @@ static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int ve
                return -1;
        }
 
+#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
+       /*
+        * SNI (RFC4366)
+        * OpenSSL does not document this function, but the implementation
+        * returns 1 on success, 0 on failure after calling SSLerr().
+        */
+       ret = SSL_set_tlsext_host_name(sock->ssl, server.host);
+       if (ret != 1)
+               warning("SSL_set_tlsext_host_name(%s) failed.", server.host);
+#endif
+
        ret = SSL_connect(sock->ssl);
        if (ret <= 0) {
                socket_perror("SSL_connect", sock, ret);
                return -1;
        }
 
+       if (verify) {
+               /* make sure the hostname matches that of the certificate */
+               cert = SSL_get_peer_certificate(sock->ssl);
+               if (!cert)
+                       return error("unable to get peer certificate.");
+               if (verify_hostname(cert, server.host) < 0)
+                       return -1;
+       }
+
        return 0;
 }
 #endif
@@ -1027,7 +1096,7 @@ static int auth_cram_md5(struct imap_store *ctx, struct imap_cmd *cmd, const cha
 
        ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
        if (ret != strlen(response))
-               return error("IMAP error: sending response failed\n");
+               return error("IMAP error: sending response failed");
 
        free(response);
 
@@ -1191,13 +1260,10 @@ static struct store *imap_open_store(struct imap_server_conf *srvc)
                        goto bail;
                }
                if (!srvc->pass) {
-                       char prompt[80];
-                       sprintf(prompt, "Password (%s@%s): ", srvc->user, srvc->host);
-                       arg = git_getpass(prompt);
-                       if (!arg) {
-                               perror("getpass");
-                               exit(1);
-                       }
+                       struct strbuf prompt = STRBUF_INIT;
+                       strbuf_addf(&prompt, "Password (%s@%s): ", srvc->user, srvc->host);
+                       arg = git_getpass(prompt.buf);
+                       strbuf_release(&prompt);
                        if (!*arg) {
                                fprintf(stderr, "Skipping account %s@%s, no password\n", srvc->user, srvc->host);
                                goto bail;
@@ -1521,6 +1587,8 @@ int main(int argc, char **argv)
 
        git_extract_argv0_path(argv[0]);
 
+       git_setup_gettext();
+
        if (argc != 1)
                usage(imap_send_usage);