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diff -up openssh-7.4p1/pam_ssh_agent_auth-0.10.3/iterate_ssh_agent_keys.c.psaa-seteuid openssh-7.4p1/pam_ssh_agent_auth-0.10.3/iterate_ssh_agent_keys.c
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--- openssh-7.4p1/pam_ssh_agent_auth-0.10.3/iterate_ssh_agent_keys.c.psaa-seteuid 2017-02-07 15:41:53.172334151 +0100
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+++ openssh-7.4p1/pam_ssh_agent_auth-0.10.3/iterate_ssh_agent_keys.c 2017-02-07 15:41:53.174334149 +0100
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@@ -238,17 +238,26 @@ ssh_get_authentication_socket_for_uid(ui
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}
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errno = 0;
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- seteuid(uid); /* To ensure a race condition is not used to circumvent the stat
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- above, we will temporarily drop UID to the caller */
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- if (connect(sock, (struct sockaddr *)&sunaddr, sizeof sunaddr) < 0) {
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+ /* To ensure a race condition is not used to circumvent the stat
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+ above, we will temporarily drop UID to the caller */
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+ if (seteuid(uid) == -1) {
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close(sock);
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- if(errno == EACCES)
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- fatal("MAJOR SECURITY WARNING: uid %lu made a deliberate and malicious attempt to open an agent socket owned by another user", (unsigned long) uid);
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+ error("seteuid(%lu) failed with error: %s",
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+ (unsigned long) uid, strerror(errno));
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return -1;
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}
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+ if (connect(sock, (struct sockaddr *)&sunaddr, sizeof sunaddr) < 0) {
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+ close(sock);
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+ sock = -1;
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+ if(errno == EACCES)
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+ fatal("MAJOR SECURITY WARNING: uid %lu made a deliberate and malicious attempt to open an agent socket owned by another user", (unsigned long) uid);
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+ }
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- seteuid(0); /* we now continue the regularly scheduled programming */
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-
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+ /* we now continue the regularly scheduled programming */
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+ if (0 != seteuid(0)) {
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+ fatal("setuid(0) failed with error: %s", strerror(errno));
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+ return -1;
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+ }
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return sock;
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}
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